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[Bug c++/53292] multi-threaded (OpenMP) is slower than single-threaded
- From: "fh_p at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 12 May 2012 21:27:31 +0000
- Subject: [Bug c++/53292] multi-threaded (OpenMP) is slower than single-threaded
- Auto-submitted: auto-generated
- References: <bug-53292-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53292
--- Comment #9 from FH <fh_p at hotmail dot com> 2012-05-12 21:27:31 UTC ---
Well...
I tested an OpenMP benchmarch (design to demonstrate OpenMP performances) found
on the web : multi-threaded (OpenMP) is again slower than single-threaded. I
looked at coding with pthreads : same thing.
So, I have a dual-core hyper-threaded PC : I end up with multi-threaded
applications slower than single-threaded and this is supposed to be a "normal"
behavior ?!... Anyway this is still illogical to me ?!?!