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[Bug libgomp/32789] Profiling not possible with -fopenmp
- From: "jensseidel at users dot sf dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 17 Jul 2007 10:24:12 -0000
- Subject: [Bug libgomp/32789] Profiling not possible with -fopenmp
- References: <bug-32789-14868@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from jensseidel at users dot sf dot net 2007-07-17 10:24 -------
(In reply to comment #2)
> And to reply to myself, it needs either to use thread local storage to hold the
> counters and then to add some piece of code to fuse the values of the various
> counters at the end of a thread (which might not be easy ?) or to use atomic
> operations (which existence depends on the architecture, but I hope that all
> multi-core processors have such instructions).
(Don't forget about SMP machines, I have a SGI Octane (2 x Mips R12000 CPUs).)
An Open MPI related discussion about atomic operations happened
the last days, because architecture specific assembler code failed again
for some exotic platforms. See e.g.
http://lists.debian.org/debian-mips/2007/07/msg00036.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32789