[Bug libgomp/37586] OpenMP thinks that I have 1 processor on an 8 processor pc

[jakub at gcc dot gnu dot org]

------- 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 affinity limited
to a subset of CPUs.  You can just step through omp_get_num_procs () /
get_num_procs () routine and/or look at strace to see what is the case.

omp_get_max_threads () in 4.3 and earlier incorrectly adjusts for dyn_var etc.,
works like parallel region determines the number of threads if num_thread isn't
specified, only on the GCC trunk (4.4 and later) it returns the nthreads_var
ICV.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
           Keywords|                            |openmp
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586