Problem when profiling a process' running/sleeping/waiting time

I am trying to profile a process in terms of running, sleeping and waiting time. I am using kernel 3.6.6 running on an IBM POWER7 machine. Initially, I decided to use a toy example where I would expect that the process remains in running state most of the time. This is the code for such a simple example:

int main() {
    for (int i = 0; i < 1000000; i++)
        for (int j = 0; j < 1000; j++);
}

I am using the following command line for reading kernel stats:

perf stat -e "sched:sched_stat_runtime,sched:sched_stat_sleep,sched:sched_stat_wait, \
sched:sched_stat_iowait,sched:sched_stat_blocked" ./test

And these are the results that I obtain:

Performance counter stats for './test':

    12,077,957,756 sched:sched_stat_runtime
   169,892,740,990 sched:sched_stat_sleep
         5,816,784 sched:sched_stat_wait
                 0 sched:sched_stat_iowait
                 0 sched:sched_stat_blocked

     12.084706279  seconds time elapsed

I cannot really understand why the counter for sched_stat_sleep is so high (even higher than sched_stat_runtime), especially for such a CPU-bound workload.

Am I missing anything, or there could be a problem with sched_stat_sleep counter?

Thank you,
Victor

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Hi Victor,

Did you ever work out what was going on here?

cheers