Memory leak on thread removal

[Marius Nünnerich]

On Tue, May 12, 2009 at 08:27, Mikolaj Golub <to.my.trociny at gmail.com> wrote:
> Hi,
>
> The code below is compiled with -fopenmp and run on FreeBSD6/7 (i386, amd64):
>
> #include <omp.h>
> #include <unistd.h>
>
> int n = 4, m = 2;
>
> int main () {
>        for (;;) {
>                int i;
>
>                //sleep(2);
> #pragma omp parallel for num_threads(m)
>                for(i = 0; i < 1; i++) {}
>
>                //sleep(2);
> #pragma omp parallel for num_threads(n)
>                for(i = 0; i < 1; i++) {}
>
>        }
>
>        return 0;
> }
>
> During the run the program's virtual memory usage constantly grows. The growth
> is observed only when n != m. When running the program with uncommented
> sleep() and observing the number of threads with 'top -H' I see in turn 2 or 4
> threads. So it looks like memory leak when thread is removed. Should I fill
> PR?

I can confirm this. I briefly looked through the libgomp code but
didn't see the leak. Anybody knows good tools how to investigate this?