1 #!/bin/sh 2 # 3 # Copyright 2012 the V8 project authors. All rights reserved. 4 # Redistribution and use in source and binary forms, with or without 5 # modification, are permitted provided that the following conditions are 6 # met: 7 # 8 # * Redistributions of source code must retain the above copyright 9 # notice, this list of conditions and the following disclaimer. 10 # * Redistributions in binary form must reproduce the above 11 # copyright notice, this list of conditions and the following 12 # disclaimer in the documentation and/or other materials provided 13 # with the distribution. 14 # * Neither the name of Google Inc. nor the names of its 15 # contributors may be used to endorse or promote products derived 16 # from this software without specific prior written permission. 17 # 18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 ########## Global variable definitions 31 32 # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE. 33 MAXIMUM_SAMPLE_RATE=10000000 34 SAMPLE_EVERY_N_CYCLES=10000 35 SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate" 36 KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict" 37 38 ########## Usage 39 40 usage() { 41 cat << EOF 42 usage: $0 <benchmark_command> 43 44 Executes <benchmark_command> under observation by the kernel's "perf" \ 45 framework, then calls the low level tick processor to analyze the results. 46 EOF 47 } 48 49 if [ $# -eq 0 ] || [ "$1" == "-h" ] || [ "$1" == "--help" ] ; then 50 usage 51 exit 1 52 fi 53 54 ########## Actual script execution 55 56 ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE) 57 if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then 58 echo "Setting appropriate maximum sample rate..." 59 echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE 60 fi 61 62 ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE) 63 if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then 64 echo "Disabling kernel address map restriction..." 65 echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE 66 fi 67 68 echo "Running benchmark..." 69 perf record -R -e cycles -c $SAMPLE_EVERY_N_CYCLES -f -i $@ --ll-prof 70
