| #!/bin/sh | |
| # | |
| # Copyright 2012 the V8 project authors. All rights reserved. | |
| # Redistribution and use in source and binary forms, with or without | |
| # modification, are permitted provided that the following conditions are | |
| # met: | |
| # | |
| # * Redistributions of source code must retain the above copyright | |
| # notice, this list of conditions and the following disclaimer. | |
| # * 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. | |
| # * Neither the name of Google Inc. nor the names of its | |
| # contributors may be used to endorse or promote products derived | |
| # from this software without specific prior written permission. | |
| # | |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT | |
| # OWNER OR 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. | |
| ########## Global variable definitions | |
| # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE. | |
| MAXIMUM_SAMPLE_RATE=10000000 | |
| SAMPLE_EVERY_N_CYCLES=10000 | |
| SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate" | |
| KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict" | |
| ########## Usage | |
| usage() { | |
| cat << EOF | |
| usage: $0 <benchmark_command> | |
| Executes <benchmark_command> under observation by the kernel's "perf" \ | |
| framework, then calls the low level tick processor to analyze the results. | |
| EOF | |
| } | |
| if [ $# -eq 0 ] || [ "$1" == "-h" ] || [ "$1" == "--help" ] ; then | |
| usage | |
| exit 1 | |
| fi | |
| ########## Actual script execution | |
| ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE) | |
| if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then | |
| echo "Setting appropriate maximum sample rate..." | |
| echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE | |
| fi | |
| ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE) | |
| if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then | |
| echo "Disabling kernel address map restriction..." | |
| echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE | |
| fi | |
| echo "Running benchmark..." | |
| perf record -R -e cycles -c $SAMPLE_EVERY_N_CYCLES -i $@ --ll-prof |