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

[jakub at gcc dot gnu dot org]

------- 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 any of the 8 CPUs (mask 0xff),
but
after a while it got confined only to the first CPU.  The question is what
has done that.  You can look for sched_setaffinity syscall in the strace dump,
then either from the surrounding syscalls or under debugger find out where
sched_setaffinity or pthread_setaffinity_np functions have been called from
or if the program invokes the syscall directly, without calling a
libc/libpthread function.


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