mirror of
https://github.com/nodejs/node.git
synced 2024-12-01 16:10:02 +01:00
2739185b79
PR-URL: https://github.com/nodejs/node/pull/9618 Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
59 lines
1.6 KiB
Bash
Executable File
59 lines
1.6 KiB
Bash
Executable File
#! /bin/sh
|
|
#
|
|
# Copyright 2016 the V8 project authors. All rights reserved.
|
|
# Use of this source code is governed by a BSD-style license that can be
|
|
# found in the LICENSE file.
|
|
#
|
|
|
|
########## Global variable definitions
|
|
|
|
# Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
|
|
MAXIMUM_SAMPLE_RATE=10000000
|
|
SAMPLE_EVERY_N_CYCLES=10000
|
|
SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
|
|
KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
|
|
CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects.
|
|
EVENT_TYPE=${EVENT_TYPE:=cycles:u}
|
|
|
|
########## Usage
|
|
|
|
usage() {
|
|
cat << EOF
|
|
usage: $0 <benchmark_command>
|
|
|
|
Executes <benchmark_command> under observation by Linux perf.
|
|
Sampling event is cycles in user space, call graphs are recorded.
|
|
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
|
|
|
|
# Extract the command being perfed, so that we can prepend arguments to the
|
|
# arguments that the user supplied.
|
|
COMMAND=$1
|
|
shift 1
|
|
|
|
echo "Running..."
|
|
perf record -R \
|
|
-e $EVENT_TYPE \
|
|
-c $SAMPLE_EVERY_N_CYCLES \
|
|
--call-graph $CALL_GRAPH_METHOD \
|
|
-i "$COMMAND" --perf_basic_prof "$@"
|