Re: [Starpu-devel] Problems using parallel tasks

[Miguel Palhas <mpalhas@gmail.com>]

I hadn't read that part yet, but i was indeed trying to run this code with:

STARPU_SCHED=pheft ./a.out

And i would expect it to try to run the task first with 1 thread, and scale in future invocations. So i would expect that multiple invocation of the call() function in my example would try to use different worker sizes right?

I tried the following:

int main() {

  starpu_init(NULL);

  call();

  call();

  call();

  starpu_shutdown();

}

But all 3 invocations use only 1 thread. Is this expected?

After reading that paragraph, i tried to use the peager scheduler as mentioned, but it doesn't seem to exist. I have however a pgreedy one, which indeed uses 3 threads when i try it. Is pgreedy and peager the same i supose?

And about the pheft one, what am i doing/expecting wrong?

Thanks for the quick answer

Best Regards

Miguel Palhas

On Wed, Jun 5, 2013 at 12:15 PM, Samuel Thibault <samuel.thibault@ens-lyon.org> wrote:

Hello,

Miguel Palhas, le Wed 05 Jun 2013 13:11:46 +0200, a écrit :

> Hi, i'm trying to use OpenMP within my tasks, but i'm having a problem, as
> starpu insists on always allowing me to use one thread.

Did you see paragraph 4.10.3  Parallel tasks performance in the
documentation ? You have to use a parallel-task-aware scheduler, and
these schedulers will try the various sizes anyway.

Samuel

--
Cumprimentos

Miguel Palhas