On Mon, 11 May 2009 19:00:54 +0300 Mikolaj Golub wrote:
> Hello,
>
> If I run the following program
>
> ---------------
>
> #include <omp.h>
>
> int n = 4, m = 2;
>
> int main () {
> for (;;) {
> int i;
>
> #pragma omp parallel num_threads(m)
> {
> int just_to_make_some_code_generated;
> just_to_make_some_code_generated = 0;
> }
> #pragma omp parallel for num_threads(n)
> for(i = 0; i < 1; i++) {}
>
> }
>
> return 0;
> }
>
> ---------------
>
> on FreeBSD6/7 (i386 and amd64) built with gcc42 or gcc43 -fopenmp (I have not
> tried other gcc versions), the memory usage is constantly growing during the
> run. The memory growth is observed in case n != m. If n == m, everything works
> ok.
The problem is observed also for constructions like this one:
#pragma omp parallel for num_threads(m)
...
#pragma omp parallel for num_threads(n)
...
Adding some sleep() code I see in top that during the program run m or n
threads are run in turn. So it looks like memory leaks when thread is
removed. It might be FreeBSD problem, not gcc.
--
Mikolaj Golub
