------- 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
