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2cc2951796
Pick up the latest branch-head for V8 5.1. This branch brings in improved language support and performance improvements. For full details: http://v8project.blogspot.com/2016/04/v8-release-51.html * Picks up the latest branch head for 5.1 [1] * Edit v8 gitignore to allow trace_event copy * Update V8 DEP trace_event as per deps/v8/DEPS [2] [1] https://chromium.googlesource.com/v8/v8.git/+/dc81244 [2] https://chromium.googlesource.com/chromium/src/base/trace_event/common/+/c8c8665 PR-URL: https://github.com/nodejs/node/pull/7016 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
53 lines
1.4 KiB
Bash
Executable File
53 lines
1.4 KiB
Bash
Executable File
#! /bin/sh
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#
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# Copyright 2016 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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#
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########## Global variable definitions
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# Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
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MAXIMUM_SAMPLE_RATE=10000000
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SAMPLE_EVERY_N_CYCLES=10000
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SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
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KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
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CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects.
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########## Usage
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usage() {
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cat << EOF
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usage: $0 <benchmark_command>
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Executes <benchmark_command> under observation by Linux perf.
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Sampling event is cycles in user space, call graphs are recorded.
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EOF
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}
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if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
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usage
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exit 1
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fi
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########## Actual script execution
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ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE)
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if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then
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echo "Setting appropriate maximum sample rate..."
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echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE
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fi
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ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE)
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if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then
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echo "Disabling kernel address map restriction..."
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echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE
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fi
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echo "Running..."
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perf record -R \
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-e cycles:u \
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-c $SAMPLE_EVERY_N_CYCLES \
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--call-graph $CALL_GRAPH_METHOD \
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-i $@ --perf_basic_prof
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