1 #! /bin/sh 2 # 3 # Copyright 2016 the V8 project authors. All rights reserved. 4 # Use of this source code is governed by a BSD-style license that can be 5 # found in the LICENSE file. 6 # 7 8 ########## Global variable definitions 9 10 # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE. 11 MAXIMUM_SAMPLE_RATE=10000000 12 SAMPLE_EVERY_N_CYCLES=10000 13 SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate" 14 KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict" 15 CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects. 16 EVENT_TYPE=${EVENT_TYPE:=cycles:u} 17 18 ########## Usage 19 20 usage() { 21 cat << EOF 22 usage: $0 <benchmark_command> 23 24 Executes <benchmark_command> under observation by Linux perf. 25 Sampling event is cycles in user space, call graphs are recorded. 26 EOF 27 } 28 29 if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then 30 usage 31 exit 1 32 fi 33 34 ########## Actual script execution 35 36 ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE) 37 if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then 38 echo "Setting appropriate maximum sample rate..." 39 echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE 40 fi 41 42 ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE) 43 if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then 44 echo "Disabling kernel address map restriction..." 45 echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE 46 fi 47 48 # Extract the command being perfed, so that we can prepend arguments to the 49 # arguments that the user supplied. 50 COMMAND=$1 51 shift 1 52 53 echo "Running..." 54 perf record -R \ 55 -e $EVENT_TYPE \ 56 -c $SAMPLE_EVERY_N_CYCLES \ 57 --call-graph $CALL_GRAPH_METHOD \ 58 -i "$COMMAND" --perf_basic_prof "$@" 59
