Can I measure the CPU usage in Linux by thread into application

Question

I have the multi-threading C application (daemon). Can I measure the CPU usage by thread into my application.

Answer 1

While this is an old question it came up as the top related hit on my own Google search. So I'll provide the answer I came up with.

Assuming you're using pthreads or a library that uses it, such as Boost libraries.

You can use pthread_getcpuclockid and clock_gettime.
Man page links pthread_getcpuclockid, clock_gettime.

Here is a simple example that return the current time as a double.

double cpuNow( void ) {
    struct timespec ts;
    clockid_t cid;

    pthread_getcpuclockid(pthread_self(), &cid);
    clock_gettime(cid, &ts);
    return ts.tv_sec + (((double)ts.tv_nsec)*0.000000001);
}

Answer 2

You can parse out the data from /proc/<PID>/stat. The CPU line looks like this:-

cpu  143359 8217 480152 132054567 45162 5678 24656 0 0