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srs/trunk/research/gperftools/cpu-profiler/cpu_profiler.cc

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C++

//
// Copyright (c) 2013-2021 Winlin
//
// SPDX-License-Identifier: MIT
//
/**
@see: http://google-perftools.googlecode.com/svn/trunk/doc/cpuprofile.html
config srs with gperf(to make gperftools):
./configure --with-gperf --jobs=3
set the pprof path if not set:
export PPROF_PATH=`pwd`/../../../objs/pprof
to do cpu profile:
make && rm -f ./srs.prof* && env CPUPROFILE=./srs.prof ./cpu_profiler
$PPROF_PATH --text cpu_profiler ./srs.prof*
to do cpu profile by signal:
make && rm -f ./srs.prof* && env CPUPROFILE=./srs.prof CPUPROFILESIGNAL=12 ./cpu_profiler
$PPROF_PATH --text cpu_profiler ./srs.prof*
*/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <gperftools/profiler.h>
void cpu_profile_imp() {
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < 110 * 1024 * 1024; ++j) {
}
printf("cpu profile, loop 110M\n");
printf("press CTRL+C if you want to abort the program.\n");
sleep(3);
}
}
void cpu_profile() {
cpu_profile_imp();
}
void handler(int sig) {
exit(0);
}
int main(int argc, char** argv) {
signal(SIGINT, handler);
// must start profiler manually.
ProfilerStart(NULL);
if (getenv("CPUPROFILESIGNAL")) {
printf("if specified CPUPROFILESIGNAL, use signal to active it: kill -12 %d\n", getpid());
sleep(3);
}
cpu_profile();
// not neccessary to call stop.
//ProfilerStop();
return 0;
}