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gcov & OpenMP David Berg Wed Feb 15 07:00:40 2012

I'm trying to familiarize myself with using gcov to analyze an OpenMP
program. I've written a simple/trivial program to create 4 threads,
print the number of threads and return.

*****************************************************
#include  "omp.h"
#include  "stdio.h"

int  main()  {

#pragma  omp parallel num_threads(4)
    printf("Threads: %d\n",  omp_get_num_threads());

    return  0;
}
******************************************************


When I run "gcc-fprofile-arcs-fopenmp-ftest-coverage test2.c && ./a.out && gcov test2.c&& grep[56]: test2.c.gcov" to see how many times lines are executed I find that gcov reports |#pragma| line is run between 3 and 5 times and the |printf| line is run
one less time than the |#pragma|. However, "Threads: 4" is always
printed 4 times.

If this is a bug I'll gladly report it. If not, can you explain why this is happening so I can understand the results of more complicated programs?

Thank you.

--
David Berg


--
--Dave