--- Comment #10 from rrpeter at sandia dot gov 2008-10-13 18:24 ---
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
jakub at gcc dot gnu dot org wrote:
> --- Comment #9 from jakub at gcc dot gnu dot org 2008-10-13 17:52 ---
> Yes, that certainly is the
--- Comment #9 from jakub at gcc dot gnu dot org 2008-10-13 17:52 ---
Yes, that certainly is the source of your problems. You could call
sched_setaffinity or pthread_sched_setaffinity in your program before entering
an OpenMP region, guess you should also find out why does that library
--- Comment #8 from rrpeter at sandia dot gov 2008-10-13 15:17 ---
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
jakub at gcc dot gnu dot org wrote:
> --- Comment #7 from jakub at gcc dot gnu dot org 2008-10-13 09:43 ---
> sched_getaffinity(3502, 12
--- Comment #7 from jakub at gcc dot gnu dot org 2008-10-13 09:43 ---
sched_getaffinity(3502, 128, { ff, 0, 0, 0 }) = 32
sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32
...
sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32
Shows that the process originally was bound to an
--- Comment #6 from rrpeter at sandia dot gov 2008-09-30 15:54 ---
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
jakub at gcc dot gnu dot org wrote:
> --- Comment #5 from jakub at gcc dot gnu dot org 2008-09-20 08:22 ---
> No, I didn't mean to ask yo
--- Comment #5 from jakub at gcc dot gnu dot org 2008-09-20 08:22 ---
No, I didn't mean to ask you to try to work around it, I asked you to
investigate why omp_get_num_procs returns 1 instead of 8. The gcc 4.3 vs. 4.4
difference only affects omp_get_max_threads, not omp_get_num_procs, s
--- Comment #4 from rrpeter at sandia dot gov 2008-09-19 22:01 ---
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
jakub at gcc dot gnu dot org wrote:
> --- Comment #3 from jakub at gcc dot gnu dot org 2008-09-19 21:45 ---
> As already said in the open
--
jakub at gcc dot gnu dot org changed:
What|Removed |Added
Status|UNCONFIRMED |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586
--- Comment #3 from jakub at gcc dot gnu dot org 2008-09-19 21:45 ---
As already said in the openmp.org forum, omp_get_num_procs () will only return
smaller number than the number of system CPUs online, if GOMP_CPU_AFFINITY env
var is used, or if the calling process and/or thread has CPU
--- Comment #2 from rrpeter at sandia dot gov 2008-09-19 16:59 ---
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
rguenth at gcc dot gnu dot org wrote:
> --- Comment #1 from rguenth at gcc dot gnu dot org 2008-09-19 14:43
> ---
> "I tried setting the
--- Comment #1 from rguenth at gcc dot gnu dot org 2008-09-19 14:43 ---
"I tried setting the environment variable OMP_NUM_THREADS to 2 and got 2
threads, but only one processor was running the job."
this suggests your operating system is limiting your job to one CPU.
--
rguenth at g
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