src/third_party/blink/Tools/Scripts/bencher

#!/usr/bin/env ruby

# Copyright (C) 2011 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.

require 'rubygems'

require 'getoptlong'
require 'pathname'
require 'tempfile'
require 'socket'

begin
  require 'json'
rescue LoadError => e
  $stderr.puts "It does not appear that you have the 'json' package installed.  Try running 'sudo gem install json'."
  exit 1
end

# Configuration

CONFIGURATION_FLNM = ENV["HOME"]+"/.bencher"

unless FileTest.exist? CONFIGURATION_FLNM
  $stderr.puts "Error: no configuration file at ~/.bencher."
  $stderr.puts "This file should contain paths to SunSpider, V8, and Kraken, as well as a"
  $stderr.puts "temporary directory that bencher can use for its remote mode. It should be"
  $stderr.puts "formatted in JSON.  For example:"
  $stderr.puts "{"
  $stderr.puts "    \"sunSpiderPath\": \"/Volumes/Data/pizlo/OpenSource/PerformanceTests/SunSpider/tests/sunspider-1.0\","
  $stderr.puts "    \"v8Path\": \"/Volumes/Data/pizlo/OpenSource/PerformanceTests/SunSpider/tests/v8-v6\","
  $stderr.puts "    \"krakenPath\": \"/Volumes/Data/pizlo/kraken/kraken-e119421cb325/tests/kraken-1.1\","
  $stderr.puts "    \"tempPath\": \"/Volumes/Data/pizlo/bencher/temp\""
  $stderr.puts "}"
  exit 1
end

CONFIGURATION = JSON.parse(File::read(CONFIGURATION_FLNM))

SUNSPIDER_PATH = CONFIGURATION["sunSpiderPath"]
V8_PATH = CONFIGURATION["v8Path"]
KRAKEN_PATH = CONFIGURATION["krakenPath"]
TEMP_PATH = CONFIGURATION["tempPath"]
BENCH_DATA_PATH = TEMP_PATH + "/benchdata"

IBR_LOOKUP=[0.00615583, 0.0975, 0.22852, 0.341628, 0.430741, 0.500526, 0.555933,
            0.600706, 0.637513, 0.668244, 0.694254, 0.716537, 0.735827, 0.752684,
            0.767535, 0.780716, 0.792492, 0.803074, 0.812634, 0.821313, 0.829227,
            0.836472, 0.843129, 0.849267, 0.854943, 0.860209, 0.865107, 0.869674,
            0.873942, 0.877941, 0.881693, 0.885223, 0.888548, 0.891686, 0.894652,
            0.897461, 0.900124, 0.902652, 0.905056, 0.907343, 0.909524, 0.911604,
            0.91359, 0.91549, 0.917308, 0.919049, 0.920718, 0.92232, 0.923859, 0.925338,
            0.926761, 0.92813, 0.929449, 0.930721, 0.931948, 0.933132, 0.934275, 0.93538,
            0.936449, 0.937483, 0.938483, 0.939452, 0.940392, 0.941302, 0.942185,
            0.943042, 0.943874, 0.944682, 0.945467, 0.94623, 0.946972, 0.947694,
            0.948396, 0.94908, 0.949746, 0.950395, 0.951027, 0.951643, 0.952244,
            0.952831, 0.953403, 0.953961, 0.954506, 0.955039, 0.955559, 0.956067,
            0.956563, 0.957049, 0.957524, 0.957988, 0.958443, 0.958887, 0.959323,
            0.959749, 0.960166, 0.960575, 0.960975, 0.961368, 0.961752, 0.962129,
            0.962499, 0.962861, 0.963217, 0.963566, 0.963908, 0.964244, 0.964574,
            0.964897, 0.965215, 0.965527, 0.965834, 0.966135, 0.966431, 0.966722,
            0.967007, 0.967288, 0.967564, 0.967836, 0.968103, 0.968366, 0.968624,
            0.968878, 0.969128, 0.969374, 0.969617, 0.969855, 0.97009, 0.970321,
            0.970548, 0.970772, 0.970993, 0.97121, 0.971425, 0.971636, 0.971843,
            0.972048, 0.97225, 0.972449, 0.972645, 0.972839, 0.973029, 0.973217,
            0.973403, 0.973586, 0.973766, 0.973944, 0.97412, 0.974293, 0.974464,
            0.974632, 0.974799, 0.974963, 0.975125, 0.975285, 0.975443, 0.975599,
            0.975753, 0.975905, 0.976055, 0.976204, 0.97635, 0.976495, 0.976638,
            0.976779, 0.976918, 0.977056, 0.977193, 0.977327, 0.97746, 0.977592,
            0.977722, 0.97785, 0.977977, 0.978103, 0.978227, 0.978349, 0.978471,
            0.978591, 0.978709, 0.978827, 0.978943, 0.979058, 0.979171, 0.979283,
            0.979395, 0.979504, 0.979613, 0.979721, 0.979827, 0.979933, 0.980037,
            0.98014, 0.980242, 0.980343, 0.980443, 0.980543, 0.980641, 0.980738,
            0.980834, 0.980929, 0.981023, 0.981116, 0.981209, 0.9813, 0.981391, 0.981481,
            0.981569, 0.981657, 0.981745, 0.981831, 0.981916, 0.982001, 0.982085,
            0.982168, 0.982251, 0.982332, 0.982413, 0.982493, 0.982573, 0.982651,
            0.982729, 0.982807, 0.982883, 0.982959, 0.983034, 0.983109, 0.983183,
            0.983256, 0.983329, 0.983401, 0.983472, 0.983543, 0.983613, 0.983683,
            0.983752, 0.98382, 0.983888, 0.983956, 0.984022, 0.984089, 0.984154,
            0.984219, 0.984284, 0.984348, 0.984411, 0.984474, 0.984537, 0.984599,
            0.98466, 0.984721, 0.984782, 0.984842, 0.984902, 0.984961, 0.985019,
            0.985077, 0.985135, 0.985193, 0.985249, 0.985306, 0.985362, 0.985417,
            0.985472, 0.985527, 0.985582, 0.985635, 0.985689, 0.985742, 0.985795,
            0.985847, 0.985899, 0.985951, 0.986002, 0.986053, 0.986103, 0.986153,
            0.986203, 0.986252, 0.986301, 0.98635, 0.986398, 0.986446, 0.986494,
            0.986541, 0.986588, 0.986635, 0.986681, 0.986727, 0.986773, 0.986818,
            0.986863, 0.986908, 0.986953, 0.986997, 0.987041, 0.987084, 0.987128,
            0.987171, 0.987213, 0.987256, 0.987298, 0.98734, 0.987381, 0.987423,
            0.987464, 0.987504, 0.987545, 0.987585, 0.987625, 0.987665, 0.987704,
            0.987744, 0.987783, 0.987821, 0.98786, 0.987898, 0.987936, 0.987974,
            0.988011, 0.988049, 0.988086, 0.988123, 0.988159, 0.988196, 0.988232,
            0.988268, 0.988303, 0.988339, 0.988374, 0.988409, 0.988444, 0.988479,
            0.988513, 0.988547, 0.988582, 0.988615, 0.988649, 0.988682, 0.988716,
            0.988749, 0.988782, 0.988814, 0.988847, 0.988879, 0.988911, 0.988943,
            0.988975, 0.989006, 0.989038, 0.989069, 0.9891, 0.989131, 0.989161, 0.989192,
            0.989222, 0.989252, 0.989282, 0.989312, 0.989342, 0.989371, 0.989401,
            0.98943, 0.989459, 0.989488, 0.989516, 0.989545, 0.989573, 0.989602, 0.98963,
            0.989658, 0.989685, 0.989713, 0.98974, 0.989768, 0.989795, 0.989822,
            0.989849, 0.989876, 0.989902, 0.989929, 0.989955, 0.989981, 0.990007,
            0.990033, 0.990059, 0.990085, 0.99011, 0.990136, 0.990161, 0.990186,
            0.990211, 0.990236, 0.990261, 0.990285, 0.99031, 0.990334, 0.990358,
            0.990383, 0.990407, 0.99043, 0.990454, 0.990478, 0.990501, 0.990525,
            0.990548, 0.990571, 0.990594, 0.990617, 0.99064, 0.990663, 0.990686,
            0.990708, 0.990731, 0.990753, 0.990775, 0.990797, 0.990819, 0.990841,
            0.990863, 0.990885, 0.990906, 0.990928, 0.990949, 0.99097, 0.990991,
            0.991013, 0.991034, 0.991054, 0.991075, 0.991096, 0.991116, 0.991137,
            0.991157, 0.991178, 0.991198, 0.991218, 0.991238, 0.991258, 0.991278,
            0.991298, 0.991317, 0.991337, 0.991356, 0.991376, 0.991395, 0.991414,
            0.991433, 0.991452, 0.991471, 0.99149, 0.991509, 0.991528, 0.991547,
            0.991565, 0.991584, 0.991602, 0.99162, 0.991639, 0.991657, 0.991675,
            0.991693, 0.991711, 0.991729, 0.991746, 0.991764, 0.991782, 0.991799,
            0.991817, 0.991834, 0.991851, 0.991869, 0.991886, 0.991903, 0.99192,
            0.991937, 0.991954, 0.991971, 0.991987, 0.992004, 0.992021, 0.992037,
            0.992054, 0.99207, 0.992086, 0.992103, 0.992119, 0.992135, 0.992151,
            0.992167, 0.992183, 0.992199, 0.992215, 0.99223, 0.992246, 0.992262,
            0.992277, 0.992293, 0.992308, 0.992324, 0.992339, 0.992354, 0.992369,
            0.992384, 0.9924, 0.992415, 0.992429, 0.992444, 0.992459, 0.992474, 0.992489,
            0.992503, 0.992518, 0.992533, 0.992547, 0.992561, 0.992576, 0.99259,
            0.992604, 0.992619, 0.992633, 0.992647, 0.992661, 0.992675, 0.992689,
            0.992703, 0.992717, 0.99273, 0.992744, 0.992758, 0.992771, 0.992785,
            0.992798, 0.992812, 0.992825, 0.992839, 0.992852, 0.992865, 0.992879,
            0.992892, 0.992905, 0.992918, 0.992931, 0.992944, 0.992957, 0.99297,
            0.992983, 0.992995, 0.993008, 0.993021, 0.993034, 0.993046, 0.993059,
            0.993071, 0.993084, 0.993096, 0.993109, 0.993121, 0.993133, 0.993145,
            0.993158, 0.99317, 0.993182, 0.993194, 0.993206, 0.993218, 0.99323, 0.993242,
            0.993254, 0.993266, 0.993277, 0.993289, 0.993301, 0.993312, 0.993324,
            0.993336, 0.993347, 0.993359, 0.99337, 0.993382, 0.993393, 0.993404,
            0.993416, 0.993427, 0.993438, 0.993449, 0.99346, 0.993472, 0.993483,
            0.993494, 0.993505, 0.993516, 0.993527, 0.993538, 0.993548, 0.993559,
            0.99357, 0.993581, 0.993591, 0.993602, 0.993613, 0.993623, 0.993634,
            0.993644, 0.993655, 0.993665, 0.993676, 0.993686, 0.993697, 0.993707,
            0.993717, 0.993727, 0.993738, 0.993748, 0.993758, 0.993768, 0.993778,
            0.993788, 0.993798, 0.993808, 0.993818, 0.993828, 0.993838, 0.993848,
            0.993858, 0.993868, 0.993877, 0.993887, 0.993897, 0.993907, 0.993916,
            0.993926, 0.993935, 0.993945, 0.993954, 0.993964, 0.993973, 0.993983,
            0.993992, 0.994002, 0.994011, 0.99402, 0.99403, 0.994039, 0.994048, 0.994057,
            0.994067, 0.994076, 0.994085, 0.994094, 0.994103, 0.994112, 0.994121,
            0.99413, 0.994139, 0.994148, 0.994157, 0.994166, 0.994175, 0.994183,
            0.994192, 0.994201, 0.99421, 0.994218, 0.994227, 0.994236, 0.994244,
            0.994253, 0.994262, 0.99427, 0.994279, 0.994287, 0.994296, 0.994304,
            0.994313, 0.994321, 0.994329, 0.994338, 0.994346, 0.994354, 0.994363,
            0.994371, 0.994379, 0.994387, 0.994395, 0.994404, 0.994412, 0.99442,
            0.994428, 0.994436, 0.994444, 0.994452, 0.99446, 0.994468, 0.994476,
            0.994484, 0.994492, 0.9945, 0.994508, 0.994516, 0.994523, 0.994531, 0.994539,
            0.994547, 0.994554, 0.994562, 0.99457, 0.994577, 0.994585, 0.994593, 0.9946,
            0.994608, 0.994615, 0.994623, 0.994631, 0.994638, 0.994645, 0.994653,
            0.99466, 0.994668, 0.994675, 0.994683, 0.99469, 0.994697, 0.994705, 0.994712,
            0.994719, 0.994726, 0.994734, 0.994741, 0.994748, 0.994755, 0.994762,
            0.994769, 0.994777, 0.994784, 0.994791, 0.994798, 0.994805, 0.994812,
            0.994819, 0.994826, 0.994833, 0.99484, 0.994847, 0.994854, 0.99486, 0.994867,
            0.994874, 0.994881, 0.994888, 0.994895, 0.994901, 0.994908, 0.994915,
            0.994922, 0.994928, 0.994935, 0.994942, 0.994948, 0.994955, 0.994962,
            0.994968, 0.994975, 0.994981, 0.994988, 0.994994, 0.995001, 0.995007,
            0.995014, 0.99502, 0.995027, 0.995033, 0.99504, 0.995046, 0.995052, 0.995059,
            0.995065, 0.995071, 0.995078, 0.995084, 0.99509, 0.995097, 0.995103,
            0.995109, 0.995115, 0.995121, 0.995128, 0.995134, 0.99514, 0.995146,
            0.995152, 0.995158, 0.995164, 0.995171, 0.995177, 0.995183, 0.995189,
            0.995195, 0.995201, 0.995207, 0.995213, 0.995219, 0.995225, 0.995231,
            0.995236, 0.995242, 0.995248, 0.995254, 0.99526, 0.995266, 0.995272,
            0.995277, 0.995283, 0.995289, 0.995295, 0.995301, 0.995306, 0.995312,
            0.995318, 0.995323, 0.995329, 0.995335, 0.99534, 0.995346, 0.995352,
            0.995357, 0.995363, 0.995369, 0.995374, 0.99538, 0.995385, 0.995391,
            0.995396, 0.995402, 0.995407, 0.995413, 0.995418, 0.995424, 0.995429,
            0.995435, 0.99544, 0.995445, 0.995451, 0.995456, 0.995462, 0.995467,
            0.995472, 0.995478, 0.995483, 0.995488, 0.995493, 0.995499, 0.995504,
            0.995509, 0.995515, 0.99552, 0.995525, 0.99553, 0.995535, 0.995541, 0.995546,
            0.995551, 0.995556, 0.995561, 0.995566, 0.995571, 0.995577, 0.995582,
            0.995587, 0.995592, 0.995597, 0.995602, 0.995607, 0.995612, 0.995617,
            0.995622, 0.995627, 0.995632, 0.995637, 0.995642, 0.995647, 0.995652,
            0.995657, 0.995661, 0.995666, 0.995671, 0.995676, 0.995681, 0.995686,
            0.995691, 0.995695, 0.9957, 0.995705, 0.99571, 0.995715, 0.995719, 0.995724,
            0.995729, 0.995734, 0.995738, 0.995743, 0.995748, 0.995753, 0.995757,
            0.995762, 0.995767, 0.995771, 0.995776, 0.995781, 0.995785, 0.99579,
            0.995794, 0.995799, 0.995804, 0.995808, 0.995813, 0.995817, 0.995822,
            0.995826, 0.995831, 0.995835, 0.99584, 0.995844, 0.995849, 0.995853,
            0.995858, 0.995862, 0.995867, 0.995871, 0.995876, 0.99588, 0.995885,
            0.995889, 0.995893, 0.995898, 0.995902, 0.995906, 0.995911, 0.995915,
            0.99592, 0.995924, 0.995928, 0.995932, 0.995937, 0.995941, 0.995945, 0.99595,
            0.995954, 0.995958, 0.995962, 0.995967, 0.995971, 0.995975, 0.995979,
            0.995984, 0.995988, 0.995992, 0.995996, 0.996, 0.996004, 0.996009, 0.996013,
            0.996017, 0.996021, 0.996025, 0.996029, 0.996033, 0.996037, 0.996041,
            0.996046, 0.99605, 0.996054, 0.996058, 0.996062, 0.996066, 0.99607, 0.996074,
            0.996078, 0.996082, 0.996086, 0.99609, 0.996094, 0.996098, 0.996102,
            0.996106, 0.99611, 0.996114, 0.996117, 0.996121, 0.996125, 0.996129,
            0.996133, 0.996137, 0.996141, 0.996145, 0.996149, 0.996152, 0.996156,
            0.99616, 0.996164]

# Run-time configuration parameters (can be set with command-line options)

$rerun=1
$inner=3
$warmup=1
$outer=4
$includeSunSpider=true
$includeV8=true
$includeKraken=true
$measureGC=false
$benchmarkPattern=nil
$verbosity=0
$timeMode=:preciseTime
$forceVMKind=nil
$brief=false
$silent=false
$remoteHosts=[]
$alsoLocal=false
$sshOptions=[]
$vms = []
$needToCopyVMs = false
$dontCopyVMs = false

$prepare = true
$run = true
$analyze = []

# Helpful functions and classes

def smallUsage
  puts "Use the --help option to get basic usage information."
  exit 1
end

def usage
  puts "bencher [options] <vm1> [<vm2> ...]"
  puts
  puts "Runs one or more JavaScript runtimes against SunSpider, V8, and/or Kraken"
  puts "benchmarks, and reports detailed statistics.  What makes bencher special is"
  puts "that each benchmark/VM configuration is run in a single VM invocation, and"
  puts "the invocations are run in random order.  This minimizes systematics due to"
  puts "one benchmark polluting the running time of another.  The fine-grained"
  puts "interleaving of VM invocations further minimizes systematics due to changes in"
  puts "the performance or behavior of your machine."
  puts
  puts "Bencher is highly configurable.  You can compare as many VMs as you like.  You"
  puts "can change the amount of warm-up iterations, number of iterations executed per"
  puts "VM invocation, and the number of VM invocations per benchmark.  By default,"
  puts "SunSpider, VM, and Kraken are all run; but you can run any combination of these"
  puts "suites."
  puts
  puts "The <vm> should be either a path to a JavaScript runtime executable (such as"
  puts "jsc), or a string of the form <name>:<path>, where the <path> is the path to"
  puts "the executable and <name> is the name that you would like to give the"
  puts "configuration for the purposeof reporting.  If no name is given, a generic name"
  puts "of the form Conf#<n> will be ascribed to the configuration automatically."
  puts
  puts "Options:"
  puts "--rerun <n>          Set the number of iterations of the benchmark that"
  puts "                     contribute to the measured run time.  Default is #{$rerun}."
  puts "--inner <n>          Set the number of inner (per-runtime-invocation)"
  puts "                     iterations.  Default is #{$inner}."
  puts "--outer <n>          Set the number of runtime invocations for each benchmark."
  puts "                     Default is #{$outer}."
  puts "--warmup <n>         Set the number of warm-up runs per invocation.  Default"
  puts "                     is #{$warmup}."
  puts "--timing-mode        Set the way that bencher measures time.  Possible values"
  puts "                     are 'preciseTime' and 'date'.  Default is 'preciseTime'."
  puts "--force-vm-kind      Turn off auto-detection of VM kind, and assume that it is"
  puts "                     the one specified.  Valid arguments are 'jsc' or"
  puts "                     'DumpRenderTree'."
  puts "--force-vm-copy      Force VM builds to be copied to bencher's working directory."
  puts "                     This may reduce pathologies resulting from path names."
  puts "--dont-copy-vms      Don't copy VMs even when doing a remote benchmarking run;"
  puts "                     instead assume that they are already there."
  puts "--v8-only            Only run V8."
  puts "--sunspider-only     Only run SunSpider."
  puts "--kraken-only        Only run Kraken."
  puts "--exclude-v8         Exclude V8 (only run SunSpider and Kraken)."
  puts "--exclude-sunspider  Exclude SunSpider (only run V8 and Kraken)."
  puts "--exclude-kraken     Exclude Kraken (only run SunSpider and V8)."
  puts "--benchmarks         Only run benchmarks matching the given regular expression."
  puts "--measure-gc         Turn off manual calls to gc(), so that GC time is measured."
  puts "                     Works best with large values of --inner.  You can also say"
  puts "                     --measure-gc <conf>, which turns this on for one"
  puts "                     configuration only."
  puts "--verbose or -v      Print more stuff."
  puts "--brief              Print only the final result for each VM."
  puts "--silent             Don't print progress. This might slightly reduce some"
  puts "                     performance perturbation."
  puts "--remote <sshhosts>  Performance performance measurements remotely, on the given"
  puts "                     SSH host(s). Easiest way to use this is to specify the SSH"
  puts "                     user@host string. However, you can also supply a comma-"
  puts "                     separated list of SSH hosts. Alternatively, you can use this"
  puts "                     option multiple times to specify multiple hosts. This"
  puts "                     automatically copies the WebKit release builds of the VMs"
  puts "                     you specified to all of the hosts."
  puts "--ssh-options        Pass additional options to SSH."
  puts "--local              Also do a local benchmark run even when doing --remote."
  puts "--prepare-only       Only prepare the bencher runscript (a shell script that"
  puts "                     invokes the VMs to run benchmarks) but don't run it."
  puts "--analyze            Only read the output of the runscript but don't do anything"
  puts "                     else. This requires passing the same arguments to bencher"
  puts "                     that you passed when running --prepare-only."
  puts "--help or -h         Display this message."
  puts
  puts "Example:"
  puts "bencher TipOfTree:/Volumes/Data/pizlo/OpenSource/WebKitBuild/Release/jsc MyChanges:/Volumes/Data/pizlo/secondary/OpenSource/WebKitBuild/Release/jsc"
  exit 1
end

def fail(reason)
  if reason.respond_to? :backtrace
    puts "FAILED: #{reason}"
    puts "Stack trace:"
    puts reason.backtrace.join("\n")
  else
    puts "FAILED: #{reason}"
  end
  smallUsage
end

def quickFail(r1,r2)
  $stderr.puts "#{$0}: #{r1}"
  puts
  fail(r2)
end

def intArg(argName,arg,min,max)
  result=arg.to_i
  unless result.to_s == arg
    quickFail("Expected an integer value for #{argName}, but got #{arg}.",
              "Invalid argument for command-line option")
  end
  if min and result<min
    quickFail("Argument for #{argName} cannot be smaller than #{min}.",
              "Invalid argument for command-line option")
  end
  if max and result>max
    quickFail("Argument for #{argName} cannot be greater than #{max}.",
              "Invalid argument for command-line option")
  end
  result
end

def computeMean(array)
  sum=0.0
  array.each {
    | value |
    sum += value
  }
  sum/array.length
end

def computeGeometricMean(array)
  mult=1.0
  array.each {
    | value |
    mult*=value
  }
  mult**(1.0/array.length)
end

def computeHarmonicMean(array)
  1.0 / computeMean(array.collect{ | value | 1.0 / value })
end

def computeStdDev(array)
  case array.length
  when 0
    0.0/0.0
  when 1
    0.0
  else
    begin
      mean=computeMean(array)
      sum=0.0
      array.each {
        | value |
        sum += (value-mean)**2
      }
      Math.sqrt(sum/(array.length-1))
    rescue
      0.0/0.0
    end
  end
end

class Array
  def shuffle!
    size.downto(1) { |n| push delete_at(rand(n)) }
    self
  end
end

def inverseBetaRegularized(n)
  IBR_LOOKUP[n-1]
end

def numToStr(num)
  "%.4f"%(num.to_f)
end

class NoChange
  attr_reader :amountFaster

  def initialize(amountFaster)
    @amountFaster = amountFaster
  end

  def shortForm
    " "
  end

  def longForm
    "  might be #{numToStr(@amountFaster)}x faster"
  end

  def to_s
    if @amountFaster < 1.01
      ""
    else
      longForm
    end
  end
end

class Faster
  attr_reader :amountFaster

  def initialize(amountFaster)
    @amountFaster = amountFaster
  end

  def shortForm
    "^"
  end

  def longForm
    "^ definitely #{numToStr(@amountFaster)}x faster"
  end

  def to_s
    longForm
  end
end

class Slower
  attr_reader :amountSlower

  def initialize(amountSlower)
    @amountSlower = amountSlower
  end

  def shortForm
    "!"
  end

  def longForm
    "! definitely #{numToStr(@amountSlower)}x slower"
  end

  def to_s
    longForm
  end
end

class MayBeSlower
  attr_reader :amountSlower

  def initialize(amountSlower)
    @amountSlower = amountSlower
  end

  def shortForm
    "?"
  end

  def longForm
    "? might be #{numToStr(@amountSlower)}x slower"
  end

  def to_s
    if @amountSlower < 1.01
      "?"
    else
      longForm
    end
  end
end

class Stats
  def initialize
    @array = []
  end

  def add(value)
    if value.is_a? Stats
      add(value.array)
    elsif value.respond_to? :each
      value.each {
        | v |
        add(v)
      }
    else
      @array << value.to_f
    end
  end

  def array
    @array
  end

  def sum
    result=0
    @array.each {
      | value |
      result += value
    }
    result
  end

  def min
    @array.min
  end

  def max
    @array.max
  end

  def size
    @array.length
  end

  def mean
    computeMean(array)
  end

  def arithmeticMean
    mean
  end

  def stdDev
    computeStdDev(array)
  end

  def stdErr
    stdDev/Math.sqrt(size)
  end

  # Computes a 95% Student's t distribution confidence interval
  def confInt
    if size < 2
      0.0/0.0
    else
      raise if size > 1000
      Math.sqrt(size-1.0)*stdErr*Math.sqrt(-1.0+1.0/inverseBetaRegularized(size-1))
    end
  end

  def lower
    mean-confInt
  end

  def upper
    mean+confInt
  end

  def geometricMean
    computeGeometricMean(array)
  end

  def harmonicMean
    computeHarmonicMean(array)
  end

  def compareTo(other)
    if upper < other.lower
      Faster.new(other.mean/mean)
    elsif lower > other.upper
      Slower.new(mean/other.mean)
    elsif mean > other.mean
      MayBeSlower.new(mean/other.mean)
    else
      NoChange.new(other.mean/mean)
    end
  end

  def to_s
    "size = #{size}, mean = #{mean}, stdDev = #{stdDev}, stdErr = #{stdErr}, confInt = #{confInt}"
  end
end

def doublePuts(out1,out2,msg)
  out1.puts "#{out2.path}: #{msg}" if $verbosity>=3
  out2.puts msg
end

class Benchfile < File
  @@counter = 0

  attr_reader :filename, :basename

  def initialize(name)
    @basename, @filename = Benchfile.uniqueFilename(name)
    super(@filename, "w")
  end

  def self.uniqueFilename(name)
    if name.is_a? Array
      basename = name[0] + @@counter.to_s + name[1]
    else
      basename = name + @@counter.to_s
    end
    filename = BENCH_DATA_PATH + "/" + basename
    @@counter += 1
    raise "Benchfile #{filename} already exists" if FileTest.exist?(filename)
    [basename, filename]
  end

  def self.create(name)
    file = Benchfile.new(name)
    yield file
    file.close
    file.basename
  end
end

$dataFiles={}
def ensureFile(key, filename)
  unless $dataFiles[key]
    $dataFiles[key] = Benchfile.create(key) {
      | outp |
      doublePuts($stderr,outp,IO::read(filename))
    }
  end
  $dataFiles[key]
end

def emitBenchRunCodeFile(name, plan, benchDataPath, benchPath)
  case plan.vm.vmType
  when :jsc
    Benchfile.create("bencher") {
      | file |
      case $timeMode
      when :preciseTime
        doublePuts($stderr,file,"function __bencher_curTimeMS() {")
        doublePuts($stderr,file,"   return preciseTime()*1000")
        doublePuts($stderr,file,"}")
      when :date
        doublePuts($stderr,file,"function __bencher_curTimeMS() {")
        doublePuts($stderr,file,"   return Date.now()")
        doublePuts($stderr,file,"}")
      else
        raise
      end

      if benchDataPath
        doublePuts($stderr,file,"load(#{benchDataPath.inspect});")
        doublePuts($stderr,file,"gc();")
        doublePuts($stderr,file,"for (var __bencher_index = 0; __bencher_index < #{$warmup+$inner}; ++__bencher_index) {")
        doublePuts($stderr,file,"   before = __bencher_curTimeMS();")
        $rerun.times {
          doublePuts($stderr,file,"   load(#{benchPath.inspect});")
        }
        doublePuts($stderr,file,"   after = __bencher_curTimeMS();")
        doublePuts($stderr,file,"   if (__bencher_index >= #{$warmup}) print(\"#{name}: #{plan.vm}: #{plan.iteration}: \" + (__bencher_index - #{$warmup}) + \": Time: \"+(after-before));");
        doublePuts($stderr,file,"   gc();") unless plan.vm.shouldMeasureGC
        doublePuts($stderr,file,"}")
      else
        doublePuts($stderr,file,"function __bencher_run(__bencher_what) {")
        doublePuts($stderr,file,"   var __bencher_before = __bencher_curTimeMS();")
        $rerun.times {
          doublePuts($stderr,file,"   run(__bencher_what);")
        }
        doublePuts($stderr,file,"   var __bencher_after = __bencher_curTimeMS();")
        doublePuts($stderr,file,"   return __bencher_after - __bencher_before;")
        doublePuts($stderr,file,"}")
        $warmup.times {
          doublePuts($stderr,file,"__bencher_run(#{benchPath.inspect})")
          doublePuts($stderr,file,"gc();") unless plan.vm.shouldMeasureGC
        }
        $inner.times {
          | innerIndex |
          doublePuts($stderr,file,"print(\"#{name}: #{plan.vm}: #{plan.iteration}: #{innerIndex}: Time: \"+__bencher_run(#{benchPath.inspect}));")
          doublePuts($stderr,file,"gc();") unless plan.vm.shouldMeasureGC
        }
      end
    }
  when :dumpRenderTree
    mainCode = Benchfile.create("bencher") {
      | file |
      doublePuts($stderr,file,"__bencher_count = 0;")
      doublePuts($stderr,file,"function __bencher_doNext(result) {")
      doublePuts($stderr,file,"    if (__bencher_count >= #{$warmup})")
      doublePuts($stderr,file,"        debug(\"#{name}: #{plan.vm}: #{plan.iteration}: \" + (__bencher_count - #{$warmup}) + \": Time: \" + result);")
      doublePuts($stderr,file,"    __bencher_count++;")
      doublePuts($stderr,file,"    if (__bencher_count < #{$inner+$warmup})")
      doublePuts($stderr,file,"        __bencher_runImpl(__bencher_doNext);")
      doublePuts($stderr,file,"    else")
      doublePuts($stderr,file,"        quit();")
      doublePuts($stderr,file,"}")
      doublePuts($stderr,file,"__bencher_runImpl(__bencher_doNext);")
    }

    cssCode = Benchfile.create("bencher-css") {
      | file |
      doublePuts($stderr,file,".pass {\n    font-weight: bold;\n    color: green;\n}\n.fail {\n    font-weight: bold;\n    color: red;\n}\n\#console {\n    white-space: pre-wrap;\n    font-family: monospace;\n}")
    }

    preCode = Benchfile.create("bencher-pre") {
      | file |
      doublePuts($stderr,file,"if (window.testRunner) {")
      doublePuts($stderr,file,"    if (window.enablePixelTesting) {")
      doublePuts($stderr,file,"        testRunner.dumpAsTextWithPixelResults();")
      doublePuts($stderr,file,"    } else {")
      doublePuts($stderr,file,"        testRunner.dumpAsText();")
      doublePuts($stderr,file,"    }")
      doublePuts($stderr,file,"}")
      doublePuts($stderr,file,"")
      doublePuts($stderr,file,"function debug(msg)")
      doublePuts($stderr,file,"{")
      doublePuts($stderr,file,"    var span = document.createElement(\"span\");")
      doublePuts($stderr,file,"    document.getElementById(\"console\").appendChild(span); // insert it first so XHTML knows the namespace")
      doublePuts($stderr,file,"    span.innerHTML = msg + '<br />';")
      doublePuts($stderr,file,"}")
      doublePuts($stderr,file,"")
      doublePuts($stderr,file,"function quit() {")
      doublePuts($stderr,file,"    testRunner.notifyDone();")
      doublePuts($stderr,file,"}")
      doublePuts($stderr,file,"")
      doublePuts($stderr,file,"__bencher_continuation=null;")
      doublePuts($stderr,file,"")
      doublePuts($stderr,file,"function reportResult(result) {")
      doublePuts($stderr,file,"    __bencher_continuation(result);")
      doublePuts($stderr,file,"}")
      doublePuts($stderr,file,"")
      doublePuts($stderr,file,"function __bencher_runImpl(continuation) {")
      doublePuts($stderr,file,"    function doit() {")
      doublePuts($stderr,file,"        document.getElementById(\"frameparent\").innerHTML = \"\";")
      doublePuts($stderr,file,"        document.getElementById(\"frameparent\").innerHTML = \"<iframe id='testframe'>\";")
      doublePuts($stderr,file,"        var testFrame = document.getElementById(\"testframe\");")
      doublePuts($stderr,file,"        testFrame.contentDocument.open();")
      doublePuts($stderr,file,"        testFrame.contentDocument.write(\"<!DOCTYPE html>\\n<head></head><body><div id=\\\"console\\\"></div>\");")
      if benchDataPath
        doublePuts($stderr,file,"        testFrame.contentDocument.write(\"<script src=\\\"#{benchDataPath}\\\"></script>\");")
      end
      doublePuts($stderr,file,"        testFrame.contentDocument.write(\"<script type=\\\"text/javascript\\\">__bencher_before = Date.now();</script><script src=\\\"#{benchPath}\\\"></script><script type=\\\"text/javascript\\\">window.parent.reportResult(Date.now() - __bencher_before);</script></body></html>\");")
      doublePuts($stderr,file,"        testFrame.contentDocument.close();")
      doublePuts($stderr,file,"    }")
      doublePuts($stderr,file,"    __bencher_continuation = continuation;")
      doublePuts($stderr,file,"    window.setTimeout(doit, 10);")
      doublePuts($stderr,file,"}")
    }

    Benchfile.create(["bencher-htmldoc",".html"]) {
      | file |
      doublePuts($stderr,file,"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">\n<html><head><link rel=\"stylesheet\" href=\"#{cssCode}\"><script src=\"#{preCode}\"></script></head><body><div id=\"console\"></div><div id=\"frameparent\"></div><script src=\"#{mainCode}\"></script></body></html>")
    }
  else
    raise
  end
end

def emitBenchRunCode(name, plan, benchDataPath, benchPath)
  plan.vm.emitRunCode(emitBenchRunCodeFile(name, plan, benchDataPath, benchPath))
end

def planForDescription(plans, benchFullname, vmName, iteration)
  raise unless benchFullname =~ /\//
  suiteName = $~.pre_match
  benchName = $~.post_match
  result = plans.select{|v| v.suite.name == suiteName and v.benchmark.name == benchName and v.vm.name == vmName and v.iteration == iteration}
  raise unless result.size == 1
  result[0]
end

class ParsedResult
  attr_reader :plan, :innerIndex, :time

  def initialize(plan, innerIndex, time)
    @plan = plan
    @innerIndex = innerIndex
    @time = time

    raise unless @plan.is_a? BenchPlan
    raise unless @innerIndex.is_a? Integer
    raise unless @time.is_a? Numeric
  end

  def benchmark
    plan.benchmark
  end

  def suite
    plan.suite
  end

  def vm
    plan.vm
  end

  def outerIndex
    plan.iteration
  end

  def self.parse(plans, string)
    if string =~ /([a-zA-Z0-9\/-]+): ([a-zA-Z0-9_# ]+): ([0-9]+): ([0-9]+): Time: /
      benchFullname = $1
      vmName = $2
      outerIndex = $3.to_i
      innerIndex = $4.to_i
      time = $~.post_match.to_f
      ParsedResult.new(planForDescription(plans, benchFullname, vmName, outerIndex), innerIndex, time)
    else
      nil
    end
  end
end

class VM
  def initialize(origPath, name, nameKind, svnRevision)
    @origPath = origPath.to_s
    @path = origPath.to_s
    @name = name
    @nameKind = nameKind

    if $forceVMKind
      @vmType = $forceVMKind
    else
      if @origPath =~ /DumpRenderTree$/
        @vmType = :dumpRenderTree
      else
        @vmType = :jsc
      end
    end

    @svnRevision = svnRevision

    # Try to detect information about the VM.
    if path =~ /\/WebKitBuild\/Release\/([a-zA-Z]+)$/
      @checkoutPath = $~.pre_match
      # FIXME: Use some variant of this:
      # <bdash>   def retrieve_revision
      # <bdash>     `perl -I#{@path}/Tools/Scripts -MVCSUtils -e 'print svnRevisionForDirectory("#{@path}");'`.to_i
      # <bdash>   end
      unless @svnRevision
        begin
          Dir.chdir(@checkoutPath) {
            $stderr.puts ">> cd #{@checkoutPath} && svn info" if $verbosity>=2
            IO.popen("svn info", "r") {
              | inp |
              inp.each_line {
                | line |
                if line =~ /Revision: ([0-9]+)/
                  @svnRevision = $1
                end
              }
            }
          }
          unless @svnRevision
            $stderr.puts "Warning: running svn info for #{name} silently failed."
          end
        rescue => e
          # Failed to detect svn revision.
          $stderr.puts "Warning: could not get svn revision information for #{name}: #{e}"
        end
      end
    else
      $stderr.puts "Warning: could not identify checkout location for #{name}"
    end

    if @path =~ /\/Release\/([a-zA-Z]+)$/
      @libPath, @relativeBinPath = $~.pre_match+"/Release", "./#{$1}"
    elsif @path =~ /\/Contents\/Resources\/([a-zA-Z]+)$/
      @libPath = $~.pre_match
    elsif @path =~ /\/JavaScriptCore.framework\/Resources\/([a-zA-Z]+)$/
      @libPath, @relativeBinPath = $~.pre_match, $&[1..-1]
    end
  end

  def canCopyIntoBenchPath
    if @libPath and @relativeBinPath
      true
    else
      false
    end
  end

  def copyIntoBenchPath
    raise unless canCopyIntoBenchPath
    basename, filename = Benchfile.uniqueFilename("vm")
    raise unless Dir.mkdir(filename)
    cmd = "cp -a #{@libPath.inspect}/* #{filename.inspect}"
    $stderr.puts ">> #{cmd}" if $verbosity>=2
    raise unless system(cmd)
    @path = "#{basename}/#{@relativeBinPath}"
    @libPath = basename
  end

  def to_s
    @name
  end

  def name
    @name
  end

  def shouldMeasureGC
    $measureGC == true or ($measureGC == name)
  end

  def origPath
    @origPath
  end

  def path
    @path
  end

  def nameKind
    @nameKind
  end

  def vmType
    @vmType
  end

  def checkoutPath
    @checkoutPath
  end

  def svnRevision
    @svnRevision
  end

  def printFunction
    case @vmType
    when :jsc
      "print"
    when :dumpRenderTree
      "debug"
    else
      raise @vmType
    end
  end

  def emitRunCode(fileToRun)
    myLibPath = @libPath
    myLibPath = "" unless myLibPath
    $script.puts "export DYLD_LIBRARY_PATH=#{myLibPath.to_s.inspect}"
    $script.puts "export DYLD_FRAMEWORK_PATH=#{myLibPath.to_s.inspect}"
    $script.puts "#{path} #{fileToRun}"
  end
end

class StatsAccumulator
  def initialize
    @stats = []
    ($outer*$inner).times {
      @stats << Stats.new
    }
  end

  def statsForIteration(outerIteration, innerIteration)
    @stats[outerIteration*$inner + innerIteration]
  end

  def stats
    result = Stats.new
    @stats.each {
      | stat |
      result.add(yield stat)
    }
    result
  end

  def geometricMeanStats
    stats {
      | stat |
      stat.geometricMean
    }
  end

  def arithmeticMeanStats
    stats {
      | stat |
      stat.arithmeticMean
    }
  end
end

module Benchmark
  attr_accessor :benchmarkSuite
  attr_reader :name

  def fullname
    benchmarkSuite.name + "/" + name
  end

  def to_s
    fullname
  end
end

class SunSpiderBenchmark
  include Benchmark

  def initialize(name)
    @name = name
  end

  def emitRunCode(plan)
    emitBenchRunCode(fullname, plan, nil, ensureFile("SunSpider-#{@name}", "#{SUNSPIDER_PATH}/#{@name}.js"))
  end
end

class V8Benchmark
  include Benchmark

  def initialize(name)
    @name = name
  end

  def emitRunCode(plan)
    emitBenchRunCode(fullname, plan, nil, ensureFile("V8-#{@name}", "#{V8_PATH}/v8-#{@name}.js"))
  end
end

class KrakenBenchmark
  include Benchmark

  def initialize(name)
    @name = name
  end

  def emitRunCode(plan)
    emitBenchRunCode(fullname, plan, ensureFile("KrakenData-#{@name}", "#{KRAKEN_PATH}/#{@name}-data.js"), ensureFile("Kraken-#{@name}", "#{KRAKEN_PATH}/#{@name}.js"))
  end
end

class BenchmarkSuite
  def initialize(name, path, preferredMean)
    @name = name
    @path = path
    @preferredMean = preferredMean
    @benchmarks = []
  end

  def name
    @name
  end

  def to_s
    @name
  end

  def path
    @path
  end

  def add(benchmark)
    if not $benchmarkPattern or "#{@name}/#{benchmark.name}" =~ $benchmarkPattern
      benchmark.benchmarkSuite = self
      @benchmarks << benchmark
    end
  end

  def benchmarks
    @benchmarks
  end

  def benchmarkForName(name)
    result = @benchmarks.select{|v| v.name == name}
    raise unless result.length == 1
    result[0]
  end

  def empty?
    @benchmarks.empty?
  end

  def retain_if
    @benchmarks.delete_if {
      | benchmark |
      not yield benchmark
    }
  end

  def preferredMean
    @preferredMean
  end

  def computeMean(stat)
    stat.send @preferredMean
  end
end

class BenchRunPlan
  def initialize(benchmark, vm, iteration)
    @benchmark = benchmark
    @vm = vm
    @iteration = iteration
  end

  def benchmark
    @benchmark
  end

  def suite
    @benchmark.benchmarkSuite
  end

  def vm
    @vm
  end

  def iteration
    @iteration
  end

  def emitRunCode
    @benchmark.emitRunCode(self)
  end
end

class BenchmarkOnVM
  def initialize(benchmark, suiteOnVM)
    @benchmark = benchmark
    @suiteOnVM = suiteOnVM
    @stats = Stats.new
  end

  def to_s
    "#{@benchmark} on #{@suiteOnVM.vm}"
  end

  def benchmark
    @benchmark
  end

  def vm
    @suiteOnVM.vm
  end

  def vmStats
    @suiteOnVM.vmStats
  end

  def suite
    @benchmark.benchmarkSuite
  end

  def suiteOnVM
    @suiteOnVM
  end

  def stats
    @stats
  end

  def parseResult(result)
    raise "VM mismatch; I've got #{vm} and they've got #{result.vm}" unless result.vm == vm
    raise unless result.benchmark == @benchmark
    @stats.add(result.time)
  end
end

class SuiteOnVM < StatsAccumulator
  def initialize(vm, vmStats, suite)
    super()
    @vm = vm
    @vmStats = vmStats
    @suite = suite

    raise unless @vm.is_a? VM
    raise unless @vmStats.is_a? StatsAccumulator
    raise unless @suite.is_a? BenchmarkSuite
  end

  def to_s
    "#{@suite} on #{@vm}"
  end

  def suite
    @suite
  end

  def vm
    @vm
  end

  def vmStats
    raise unless @vmStats
    @vmStats
  end
end

class BenchPlan
  def initialize(benchmarkOnVM, iteration)
    @benchmarkOnVM = benchmarkOnVM
    @iteration = iteration
  end

  def to_s
    "#{@benchmarkOnVM} \##{@iteration+1}"
  end

  def benchmarkOnVM
    @benchmarkOnVM
  end

  def benchmark
    @benchmarkOnVM.benchmark
  end

  def suite
    @benchmarkOnVM.suite
  end

  def vm
    @benchmarkOnVM.vm
  end

  def iteration
    @iteration
  end

  def parseResult(result)
    raise unless result.plan == self
    @benchmarkOnVM.parseResult(result)
    @benchmarkOnVM.vmStats.statsForIteration(@iteration, result.innerIndex).add(result.time)
    @benchmarkOnVM.suiteOnVM.statsForIteration(@iteration, result.innerIndex).add(result.time)
  end
end

def lpad(str,chars)
  if str.length>chars
    str
  else
    "%#{chars}s"%(str)
  end
end

def rpad(str,chars)
  while str.length<chars
    str+=" "
  end
  str
end

def center(str,chars)
  while str.length<chars
    str+=" "
    if str.length<chars
      str=" "+str
    end
  end
  str
end

def statsToStr(stats)
  if $inner*$outer == 1
    string = numToStr(stats.mean)
    raise unless string =~ /\./
    left = $~.pre_match
    right = $~.post_match
    lpad(left,12)+"."+rpad(right,9)
  else
    lpad(numToStr(stats.mean),11)+"+-"+rpad(numToStr(stats.confInt),9)
  end
end

def plural(num)
  if num == 1
    ""
  else
    "s"
  end
end

def wrap(str, columns)
  array = str.split
  result = ""
  curLine = array.shift
  array.each {
    | curStr |
    if (curLine + " " + curStr).size > columns
      result += curLine + "\n"
      curLine = curStr
    else
      curLine += " " + curStr
    end
  }
  result + curLine + "\n"
end

def runAndGetResults
  results = nil
  Dir.chdir(BENCH_DATA_PATH) {
    IO.popen("sh ./runscript", "r") {
      | inp |
      results = inp.read
    }
    raise "Script did not complete correctly: #{$?}" unless $?.success?
  }
  raise unless results
  results
end

def parseAndDisplayResults(results)
  vmStatses = []
  $vms.each {
    vmStatses << StatsAccumulator.new
  }

  suitesOnVMs = []
  suitesOnVMsForSuite = {}
  $suites.each {
    | suite |
    suitesOnVMsForSuite[suite] = []
  }
  suitesOnVMsForVM = {}
  $vms.each {
    | vm |
    suitesOnVMsForVM[vm] = []
  }

  benchmarksOnVMs = []
  benchmarksOnVMsForBenchmark = {}
  $benchmarks.each {
    | benchmark |
    benchmarksOnVMsForBenchmark[benchmark] = []
  }

  $vms.each_with_index {
    | vm, vmIndex |
    vmStats = vmStatses[vmIndex]
    $suites.each {
      | suite |
      suiteOnVM = SuiteOnVM.new(vm, vmStats, suite)
      suitesOnVMs << suiteOnVM
      suitesOnVMsForSuite[suite] << suiteOnVM
      suitesOnVMsForVM[vm] << suiteOnVM
      suite.benchmarks.each {
        | benchmark |
        benchmarkOnVM = BenchmarkOnVM.new(benchmark, suiteOnVM)
        benchmarksOnVMs << benchmarkOnVM
        benchmarksOnVMsForBenchmark[benchmark] << benchmarkOnVM
      }
    }
  }

  plans = []
  benchmarksOnVMs.each {
    | benchmarkOnVM |
    $outer.times {
      | iteration |
      plans << BenchPlan.new(benchmarkOnVM, iteration)
    }
  }

  hostname = nil
  hwmodel = nil
  results.each_line {
    | line |
    line.chomp!
    if line =~ /HOSTNAME:([^.]+)/
      hostname = $1
    elsif line =~ /HARDWARE:hw\.model: /
      hwmodel = $~.post_match.chomp
    else
      result = ParsedResult.parse(plans, line.chomp)
      if result
        result.plan.parseResult(result)
      end
    end
  }

  # Compute the geomean of the preferred means of results on a SuiteOnVM
  overallResults = []
  $vms.each {
    | vm |
    result = Stats.new
    $outer.times {
      | outerIndex |
      $inner.times {
        | innerIndex |
        curResult = Stats.new
        suitesOnVMsForVM[vm].each {
          | suiteOnVM |
          # For a given iteration, suite, and VM, compute the suite's preferred mean
          # over the data collected for all benchmarks in that suite. We'll have one
          # sample per benchmark. For example on V8 this will be the geomean of 1
          # sample for crypto, 1 sample for deltablue, and so on, and 1 sample for
          # splay.
          curResult.add(suiteOnVM.suite.computeMean(suiteOnVM.statsForIteration(outerIndex, innerIndex)))
        }

        # curResult now holds 1 sample for each of the means computed in the above
        # loop. Compute the geomean over this, and store it.
        result.add(curResult.geometricMean)
      }
    }

    # $overallResults will have a Stats for each VM. That Stats object will hold
    # $inner*$outer geomeans, allowing us to compute the arithmetic mean and
    # confidence interval of the geomeans of preferred means. Convoluted, but
    # useful and probably sound.
    overallResults << result
  }

  if $verbosity >= 2
    benchmarksOnVMs.each {
      | benchmarkOnVM |
      $stderr.puts "#{benchmarkOnVM}: #{benchmarkOnVM.stats}"
    }

    $vms.each_with_index {
      | vm, vmIndex |
      vmStats = vmStatses[vmIndex]
      $stderr.puts "#{vm} (arithmeticMean): #{vmStats.arithmeticMeanStats}"
      $stderr.puts "#{vm} (geometricMean): #{vmStats.geometricMeanStats}"
    }
  end

  reportName =
    (if ($vms.collect {
           | vm |
           vm.nameKind
         }.index :auto)
       ""
     else
       $vms.collect {
         | vm |
         vm.to_s
       }.join("_") + "_"
     end) +
    ($suites.collect {
       | suite |
       suite.to_s
     }.join("")) + "_" +
    (if hostname
       hostname + "_"
     else
       ""
     end)+
    (begin
       time = Time.now
       "%04d%02d%02d_%02d%02d" %
         [ time.year, time.month, time.day,
           time.hour, time.min ]
     end) +
    "_benchReport.txt"

  unless $brief
    puts "Generating benchmark report at #{reportName}"
  end

  outp = $stdout
  begin
    outp = File.open(reportName,"w")
  rescue => e
    $stderr.puts "Error: could not save report to #{reportName}: #{e}"
    $stderr.puts
  end

  def createVMsString
    result = ""
    result += "   " if $suites.size > 1
    result += rpad("", $benchpad)
    result += " "
    $vms.size.times {
      | index |
      if index != 0
        result += " "+NoChange.new(0).shortForm
      end
      result += lpad(center($vms[index].name, 9+9+2), 11+9+2)
    }
    result += "    "
    if $vms.size >= 3
      result += center("#{$vms[-1].name} v. #{$vms[0].name}",26)
    elsif $vms.size >= 2
      result += " "*26
    end
    result
  end

  columns = [createVMsString.size, 78].max

  outp.print "Benchmark report for "
  if $suites.size == 1
    outp.print $suites[0].to_s
  elsif $suites.size == 2
    outp.print "#{$suites[0]} and #{$suites[1]}"
  else
    outp.print "#{$suites[0..-2].join(', ')}, and #{$suites[-1]}"
  end
  if hostname
    outp.print " on #{hostname}"
  end
  if hwmodel
    outp.print " (#{hwmodel})"
  end
  outp.puts "."
  outp.puts

  # This looks stupid; revisit later.
  if false
    $suites.each {
      | suite |
      outp.puts "#{suite} at #{suite.path}"
    }

    outp.puts
  end

  outp.puts "VMs tested:"
  $vms.each {
    | vm |
    outp.print "\"#{vm.name}\" at #{vm.origPath}"
    if vm.svnRevision
      outp.print " (r#{vm.svnRevision})"
    end
    outp.puts
  }

  outp.puts

  outp.puts wrap("Collected #{$outer*$inner} sample#{plural($outer*$inner)} per benchmark/VM, "+
                 "with #{$outer} VM invocation#{plural($outer)} per benchmark."+
                 (if $rerun > 1 then (" Ran #{$rerun} benchmark iterations, and measured the "+
                                      "total time of those iterations, for each sample.")
                  else "" end)+
                 (if $measureGC == true then (" No manual garbage collection invocations were "+
                                              "emitted.")
                  elsif $measureGC then (" Emitted a call to gc() between sample measurements for "+
                                         "all VMs except #{$measureGC}.")
                  else (" Emitted a call to gc() between sample measurements.") end)+
                 (if $warmup == 0 then (" Did not include any warm-up iterations; measurements "+
                                        "began with the very first iteration.")
                  else (" Used #{$warmup*$rerun} benchmark iteration#{plural($warmup*$rerun)} per VM "+
                        "invocation for warm-up.") end)+
                 (case $timeMode
                  when :preciseTime then (" Used the jsc-specific preciseTime() function to get "+
                                          "microsecond-level timing.")
                  when :date then (" Used the portable Date.now() method to get millisecond-"+
                                   "level timing.")
                  else raise end)+
                 " Reporting benchmark execution times with 95% confidence "+
                 "intervals in milliseconds.",
                 columns)

  outp.puts

  def printVMs(outp)
    outp.puts createVMsString
  end

  def summaryStats(outp, accumulators, name, &proc)
    outp.print "   " if $suites.size > 1
    outp.print rpad(name, $benchpad)
    outp.print " "
    accumulators.size.times {
      | index |
      if index != 0
        outp.print " "+accumulators[index].stats(&proc).compareTo(accumulators[index-1].stats(&proc)).shortForm
      end
      outp.print statsToStr(accumulators[index].stats(&proc))
    }
    if accumulators.size>=2
      outp.print("    "+accumulators[-1].stats(&proc).compareTo(accumulators[0].stats(&proc)).longForm)
    end
    outp.puts
  end

  def meanName(currentMean, preferredMean)
    result = "<#{currentMean}>"
    if "#{currentMean}Mean" == preferredMean.to_s
      result += " *"
    end
    result
  end

  def allSummaryStats(outp, accumulators, preferredMean)
    summaryStats(outp, accumulators, meanName("arithmetic", preferredMean)) {
      | stat |
      stat.arithmeticMean
    }

    summaryStats(outp, accumulators, meanName("geometric", preferredMean)) {
      | stat |
      stat.geometricMean
    }

    summaryStats(outp, accumulators, meanName("harmonic", preferredMean)) {
      | stat |
      stat.harmonicMean
    }
  end

  $suites.each {
    | suite |
    printVMs(outp)
    if $suites.size > 1
      outp.puts "#{suite.name}:"
    else
      outp.puts
    end
    suite.benchmarks.each {
      | benchmark |
      outp.print "   " if $suites.size > 1
      outp.print rpad(benchmark.name, $benchpad)
      outp.print " "
      myConfigs = benchmarksOnVMsForBenchmark[benchmark]
      myConfigs.size.times {
        | index |
        if index != 0
          outp.print " "+myConfigs[index].stats.compareTo(myConfigs[index-1].stats).shortForm
        end
        outp.print statsToStr(myConfigs[index].stats)
      }
      if $vms.size>=2
        outp.print("    "+myConfigs[-1].stats.compareTo(myConfigs[0].stats).to_s)
      end
      outp.puts
    }
    outp.puts
    allSummaryStats(outp, suitesOnVMsForSuite[suite], suite.preferredMean)
    outp.puts if $suites.size > 1
  }

  if $suites.size > 1
    printVMs(outp)
    outp.puts "All benchmarks:"
    allSummaryStats(outp, vmStatses, nil)

    outp.puts
    printVMs(outp)
    outp.puts "Geomean of preferred means:"
    outp.print "   "
    outp.print rpad("<scaled-result>", $benchpad)
    outp.print " "
    $vms.size.times {
      | index |
      if index != 0
        outp.print " "+overallResults[index].compareTo(overallResults[index-1]).shortForm
      end
      outp.print statsToStr(overallResults[index])
    }
    if overallResults.size>=2
      outp.print("    "+overallResults[-1].compareTo(overallResults[0]).longForm)
    end
    outp.puts
  end
  outp.puts

  if outp != $stdout
    outp.close
  end

  if outp != $stdout and not $brief
    puts
    File.open(reportName) {
      | inp |
      puts inp.read
    }
  end

  if $brief
    puts(overallResults.collect{|stats| stats.mean}.join("\t"))
    puts(overallResults.collect{|stats| stats.confInt}.join("\t"))
  end


end

begin
  $sawBenchOptions = false

  def resetBenchOptionsIfNecessary
    unless $sawBenchOptions
      $includeSunSpider = false
      $includeV8 = false
      $includeKraken = false
      $sawBenchOptions = true
    end
  end

  GetoptLong.new(['--rerun', GetoptLong::REQUIRED_ARGUMENT],
                 ['--inner', GetoptLong::REQUIRED_ARGUMENT],
                 ['--outer', GetoptLong::REQUIRED_ARGUMENT],
                 ['--warmup', GetoptLong::REQUIRED_ARGUMENT],
                 ['--timing-mode', GetoptLong::REQUIRED_ARGUMENT],
                 ['--sunspider-only', GetoptLong::NO_ARGUMENT],
                 ['--v8-only', GetoptLong::NO_ARGUMENT],
                 ['--kraken-only', GetoptLong::NO_ARGUMENT],
                 ['--exclude-sunspider', GetoptLong::NO_ARGUMENT],
                 ['--exclude-v8', GetoptLong::NO_ARGUMENT],
                 ['--exclude-kraken', GetoptLong::NO_ARGUMENT],
                 ['--sunspider', GetoptLong::NO_ARGUMENT],
                 ['--v8', GetoptLong::NO_ARGUMENT],
                 ['--kraken', GetoptLong::NO_ARGUMENT],
                 ['--benchmarks', GetoptLong::REQUIRED_ARGUMENT],
                 ['--measure-gc', GetoptLong::OPTIONAL_ARGUMENT],
                 ['--force-vm-kind', GetoptLong::REQUIRED_ARGUMENT],
                 ['--force-vm-copy', GetoptLong::NO_ARGUMENT],
                 ['--dont-copy-vms', GetoptLong::NO_ARGUMENT],
                 ['--verbose', '-v', GetoptLong::NO_ARGUMENT],
                 ['--brief', GetoptLong::NO_ARGUMENT],
                 ['--silent', GetoptLong::NO_ARGUMENT],
                 ['--remote', GetoptLong::REQUIRED_ARGUMENT],
                 ['--local', GetoptLong::NO_ARGUMENT],
                 ['--ssh-options', GetoptLong::REQUIRED_ARGUMENT],
                 ['--slave', GetoptLong::NO_ARGUMENT],
                 ['--prepare-only', GetoptLong::NO_ARGUMENT],
                 ['--analyze', GetoptLong::REQUIRED_ARGUMENT],
                 ['--vms', GetoptLong::REQUIRED_ARGUMENT],
                 ['--help', '-h', GetoptLong::NO_ARGUMENT]).each {
    | opt, arg |
    case opt
    when '--rerun'
      $rerun = intArg(opt,arg,1,nil)
    when '--inner'
      $inner = intArg(opt,arg,1,nil)
    when '--outer'
      $outer = intArg(opt,arg,1,nil)
    when '--warmup'
      $warmup = intArg(opt,arg,0,nil)
    when '--timing-mode'
      if arg.upcase == "PRECISETIME"
        $timeMode = :preciseTime
      elsif arg.upcase == "DATE"
        $timeMode = :date
      elsif arg.upcase == "AUTO"
        $timeMode = :auto
      else
        quickFail("Expected either 'preciseTime', 'date', or 'auto' for --time-mode, but got '#{arg}'.",
                  "Invalid argument for command-line option")
      end
    when '--force-vm-kind'
      if arg.upcase == "JSC"
        $forceVMKind = :jsc
      elsif arg.upcase == "DUMPRENDERTREE"
        $forceVMKind = :dumpRenderTree
      elsif arg.upcase == "AUTO"
        $forceVMKind = nil
      else
        quickFail("Expected either 'jsc' or 'DumpRenderTree' for --force-vm-kind, but got '#{arg}'.",
                  "Invalid argument for command-line option")
      end
    when '--force-vm-copy'
      $needToCopyVMs = true
    when '--dont-copy-vms'
      $dontCopyVMs = true
    when '--sunspider-only'
      $includeV8 = false
      $includeKraken = false
    when '--v8-only'
      $includeSunSpider = false
      $includeKraken = false
    when '--kraken-only'
      $includeSunSpider = false
      $includeV8 = false
    when '--exclude-sunspider'
      $includeSunSpider = false
    when '--exclude-v8'
      $includeV8 = false
    when '--exclude-kraken'
      $includeKraken = false
    when '--sunspider'
      resetBenchOptionsIfNecessary
      $includeSunSpider = true
    when '--v8'
      resetBenchOptionsIfNecessary
      $includeV8 = true
    when '--kraken'
      resetBenchOptionsIfNecessary
      $includeKraken = true
    when '--benchmarks'
      $benchmarkPattern = Regexp.new(arg)
    when '--measure-gc'
      if arg == ''
        $measureGC = true
      else
        $measureGC = arg
      end
    when '--verbose'
      $verbosity += 1
    when '--brief'
      $brief = true
    when '--silent'
      $silent = true
    when '--remote'
      $remoteHosts += arg.split(',')
      $needToCopyVMs = true
    when '--ssh-options'
      $sshOptions << arg
    when '--local'
      $alsoLocal = true
    when '--prepare-only'
      $run = false
    when '--analyze'
      $prepare = false
      $run = false
      $analyze << arg
    when '--help'
      usage
    else
      raise "bad option: #{opt}"
    end
  }

  # If the --dont-copy-vms option was passed, it overrides the --force-vm-copy option.
  if $dontCopyVMs
    $needToCopyVMs = false
  end

  SUNSPIDER = BenchmarkSuite.new("SunSpider", SUNSPIDER_PATH, :arithmeticMean)
  ["3d-cube", "3d-morph", "3d-raytrace", "access-binary-trees",
   "access-fannkuch", "access-nbody", "access-nsieve",
   "bitops-3bit-bits-in-byte", "bitops-bits-in-byte", "bitops-bitwise-and",
   "bitops-nsieve-bits", "controlflow-recursive", "crypto-aes",
   "crypto-md5", "crypto-sha1", "date-format-tofte", "date-format-xparb",
   "math-cordic", "math-partial-sums", "math-spectral-norm", "regexp-dna",
   "string-base64", "string-fasta", "string-tagcloud",
   "string-unpack-code", "string-validate-input"].each {
    | name |
    SUNSPIDER.add SunSpiderBenchmark.new(name)
  }

  V8 = BenchmarkSuite.new("V8", V8_PATH, :geometricMean)
  ["crypto", "deltablue", "earley-boyer", "raytrace",
   "regexp", "richards", "splay"].each {
    | name |
    V8.add V8Benchmark.new(name)
  }

  KRAKEN = BenchmarkSuite.new("Kraken", KRAKEN_PATH, :arithmeticMean)
  ["ai-astar", "audio-beat-detection", "audio-dft", "audio-fft",
   "audio-oscillator", "imaging-darkroom", "imaging-desaturate",
   "imaging-gaussian-blur", "json-parse-financial",
   "json-stringify-tinderbox", "stanford-crypto-aes",
   "stanford-crypto-ccm", "stanford-crypto-pbkdf2",
   "stanford-crypto-sha256-iterative"].each {
    | name |
    KRAKEN.add KrakenBenchmark.new(name)
  }

  ARGV.each {
    | vm |
    if vm =~ /([a-zA-Z0-9_ ]+):/
      name = $1
      nameKind = :given
      vm = $~.post_match
    else
      name = "Conf\##{$vms.length+1}"
      nameKind = :auto
    end
    $stderr.puts "#{name}: #{vm}" if $verbosity >= 1
    $vms << VM.new(Pathname.new(vm).realpath, name, nameKind, nil)
  }

  if $vms.empty?
    quickFail("Please specify at least on configuraiton on the command line.",
              "Insufficient arguments")
  end

  $vms.each {
    | vm |
    if vm.vmType != :jsc and $timeMode != :date
      $timeMode = :date
      $stderr.puts "Warning: using Date.now() instead of preciseTime() because #{vm} doesn't support the latter."
    end
  }

  if FileTest.exist? BENCH_DATA_PATH
    cmd = "rm -rf #{BENCH_DATA_PATH}"
    $stderr.puts ">> #{cmd}" if $verbosity >= 2
    raise unless system cmd
  end

  Dir.mkdir BENCH_DATA_PATH

  if $needToCopyVMs
    canCopyIntoBenchPath = true
    $vms.each {
      | vm |
      canCopyIntoBenchPath = false unless vm.canCopyIntoBenchPath
    }

    if canCopyIntoBenchPath
      $vms.each {
        | vm |
        $stderr.puts "Copying #{vm} into #{BENCH_DATA_PATH}..."
        vm.copyIntoBenchPath
      }
      $stderr.puts "All VMs are in place."
    else
      $stderr.puts "Warning: don't know how to copy some VMs into #{BENCH_DATA_PATH}, so I won't do it."
    end
  end

  if $measureGC and $measureGC != true
    found = false
    $vms.each {
      | vm |
      if vm.name == $measureGC
        found = true
      end
    }
    unless found
      $stderr.puts "Warning: --measure-gc option ignored because no VM is named #{$measureGC}"
    end
  end

  if $outer*$inner == 1
    $stderr.puts "Warning: will only collect one sample per benchmark/VM.  Confidence interval calculation will fail."
  end

  $stderr.puts "Using timeMode = #{$timeMode}." if $verbosity >= 1

  $suites = []

  if $includeSunSpider and not SUNSPIDER.empty?
    $suites << SUNSPIDER
  end

  if $includeV8 and not V8.empty?
    $suites << V8
  end

  if $includeKraken and not KRAKEN.empty?
    $suites << KRAKEN
  end

  $benchmarks = []
  $suites.each {
    | suite |
    $benchmarks += suite.benchmarks
  }

  $runPlans = []
  $vms.each {
    | vm |
    $benchmarks.each {
      | benchmark |
      $outer.times {
        | iteration |
        $runPlans << BenchRunPlan.new(benchmark, vm, iteration)
      }
    }
  }

  $runPlans.shuffle!

  $suitepad = $suites.collect {
    | suite |
    suite.to_s.size
  }.max + 1

  $benchpad = ($benchmarks +
               ["<arithmetic> *", "<geometric> *", "<harmonic> *"]).collect {
    | benchmark |
    if benchmark.respond_to? :name
      benchmark.name.size
    else
      benchmark.size
    end
  }.max + 1

  $vmpad = $vms.collect {
    | vm |
    vm.to_s.size
  }.max + 1

  if $prepare
    File.open("#{BENCH_DATA_PATH}/runscript", "w") {
      | file |
      file.puts "echo \"HOSTNAME:\\c\""
      file.puts "hostname"
      file.puts "echo"
      file.puts "echo \"HARDWARE:\\c\""
      file.puts "/usr/sbin/sysctl hw.model"
      file.puts "echo"
      file.puts "set -e"
      $script = file
      $runPlans.each_with_index {
        | plan, idx |
        if $verbosity == 0 and not $silent
          text1 = lpad(idx.to_s,$runPlans.size.to_s.size)+"/"+$runPlans.size.to_s
          text2 = plan.benchmark.to_s+"/"+plan.vm.to_s
          file.puts("echo "+("\r#{text1} #{rpad(text2,$suitepad+1+$benchpad+1+$vmpad)}".inspect)[0..-2]+"\\c\" 1>&2")
          file.puts("echo "+("\r#{text1} #{text2}".inspect)[0..-2]+"\\c\" 1>&2")
        end
        plan.emitRunCode
      }
      if $verbosity == 0 and not $silent
        file.puts("echo "+("\r#{$runPlans.size}/#{$runPlans.size} #{' '*($suitepad+1+$benchpad+1+$vmpad)}".inspect)[0..-2]+"\\c\" 1>&2")
        file.puts("echo "+("\r#{$runPlans.size}/#{$runPlans.size}".inspect)+" 1>&2")
      end
    }
  end

  if $run
    unless $remoteHosts.empty?
      $stderr.puts "Packaging benchmarking directory for remote hosts..." if $verbosity==0
      Dir.chdir(TEMP_PATH) {
        cmd = "tar -czf payload.tar.gz benchdata"
        $stderr.puts ">> #{cmd}" if $verbosity>=2
        raise unless system(cmd)
      }

      def grokHost(host)
        if host =~ /:([0-9]+)$/
          "-p " + $1 + " " + $~.pre_match.inspect
        else
          host.inspect
        end
      end

      def sshRead(host, command)
        cmd = "ssh #{$sshOptions.collect{|x| x.inspect}.join(' ')} #{grokHost(host)} #{command.inspect}"
        $stderr.puts ">> #{cmd}" if $verbosity>=2
        result = ""
        IO.popen(cmd, "r") {
          | inp |
          inp.each_line {
            | line |
            $stderr.puts "#{host}: #{line}" if $verbosity>=2
            result += line
          }
        }
        raise "#{$?}" unless $?.success?
        result
      end

      def sshWrite(host, command, data)
        cmd = "ssh #{$sshOptions.collect{|x| x.inspect}.join(' ')} #{grokHost(host)} #{command.inspect}"
        $stderr.puts ">> #{cmd}" if $verbosity>=2
        IO.popen(cmd, "w") {
          | outp |
          outp.write(data)
        }
        raise "#{$?}" unless $?.success?
      end

      $remoteHosts.each {
        | host |
        $stderr.puts "Sending benchmark payload to #{host}..." if $verbosity==0

        remoteTempPath = JSON::parse(sshRead(host, "cat ~/.bencher"))["tempPath"]
        raise unless remoteTempPath

        sshWrite(host, "cd #{remoteTempPath.inspect} && rm -rf benchdata && tar -xz", IO::read("#{TEMP_PATH}/payload.tar.gz"))

        $stderr.puts "Running on #{host}..." if $verbosity==0

        parseAndDisplayResults(sshRead(host, "cd #{(remoteTempPath+'/benchdata').inspect} && sh runscript"))
      }
    end

    if not $remoteHosts.empty? and $alsoLocal
      $stderr.puts "Running locally..."
    end

    if $remoteHosts.empty? or $alsoLocal
      parseAndDisplayResults(runAndGetResults)
    end
  end

  $analyze.each_with_index {
    | filename, index |
    if index >= 1
      puts
    end
    parseAndDisplayResults(IO::read(filename))
  }

  if $prepare and not $run and $analyze.empty?
    puts wrap("Benchmarking script and data are in #{BENCH_DATA_PATH}. You can run "+
              "the benchmarks and get the results by doing:", 78)
    puts
    puts "cd #{BENCH_DATA_PATH}"
    puts "sh runscript > results.txt"
    puts
    puts wrap("Then you can analyze the results by running bencher with the same arguments "+
              "as now, but replacing --prepare-only with --analyze results.txt.", 78)
  end
rescue => e
  fail(e)
end