A simple method to test the gprof performance of multi-threaded opening

When you use the gprof, you only know that the original gprof can only be counted on the main thread. There are no thread-related issues on the manual.

But there are ready-made solutions: http://sam.zoy.org/writings/programming/gprof.html

The scheme encapsulates the pthread_create (), allowing the thread to initialize the execution of a setitimer (Itimer_prof, ...).

An easy way to do this is to write a setitimer () directly in your code.

#include <sys/time.h>
#include <boost/thread.hpp>

struct itimerval g_itimer;

void foo ()
{
    Setitimer (itimer_prof, &g_itimer, NULL);
    for (int i = 0; i < 10000000 i++)
        (void) i;
}

int main ()
{
    Getitimer (itimer_prof, &g_itimer);
    Boost::thread T (&foo);
    T.join ();
    return 0;
}

g++ Main.cpp-pg-lboost_thread

./a.out

Gprof

This will help you to count the time consuming foo (). There will be no time-consuming statistics for foo () without Setitimer ().