On Friday, February 24, 2012, erotavlas_tu...@libero.it wrote: > Hi all, > > I would like to use Helgrind tool of Valgrind but I read on the manual the > following statement: Runtime support library for GNU OpenMP (part of GCC), > at least for GCC versions 4.2 and 4.3. The GNU OpenMP runtime library > (libgomp.so) constructs its own synchronisation primitives using > combinations of atomic memory instructions and the futex syscall, which > causes total chaos since in Helgrind since it cannot "see" those. > > The current version of GCC 4.6.2 still uses the futex syscall. Can I use > Helgrind or the problem is still present?.
The problem is almost certainly still present. However, I developed a patch for GCC 4.5 that modifies its libgomp.so (the runtime support library for GNU OpenMP) so that it passes information about inter thread synchronisation events to Helgrind (and maybe, DRD). Using that, it was possible to run quite large OpenMP apps on Helgrind without false positives. It does mean you have to patch and build your own gcc, and use that to compile your app, but in the grand scheme of things that's no big deal. If you want to try it out, and/or try to update the patch for gcc 4.6, I'm happy to make it available. J ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
