On Wed, Jul 16, 2014 at 1:33 PM, Kirk, Benjamin (JSC-EG311) <benjamin.k...@nasa.gov> wrote: > On Jul 16, 2014, at 2:25 PM, John Peterson <jwpeter...@gmail.com> wrote: > >> The next thing I'll try is re-enabling tbb, but removing the >> scalable_allocator template parameters from dof_map.h and >> sparsity_pattern.h, and making sure we're still valgrind-clean. >> Assuming this works, what is the correct long-term fix? >> scalable_allocator seems to be an optimization, so the simplest >> approach is to just remove it... I wouldn't be opposed to e.g. >> enabling it only when C++11 is enabled, although that is quite a hack, >> and only shows that we do not know what the real problem is. > > IIRC the scalable allocator is almost a prerequisite to actually see a > speedup with TBB here. Otherwise there's so much per-thread allocation > contention things can actually slow down, so I think we need to use it when > possible. Might be worth profiling on a more recent system though rather > than relying in my increasingly hazy memory.
Good to know, we should certainly try to keep it in the code! > Alternatively, does enabling C++11 give us any other allocator we can stick > in there? > > Also, just found this: > > http://valgrind.org/docs/manual/dist.news.html > looks like bug #317318 > > 317318 Support for Threading Building Blocks "scalable_malloc" Oh yeah, forgot about google ... :P Also found this little hint: http://kate-editor.org/2013/07/29/intel-threading-building-blocks-scalable-allocator-valgrind/ > should be fixed in valgrind 3.9.0. What version are you running? 3.7.0, I could try and see if there is a newer binary available for the system I'm on. -- John ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Libmesh-devel mailing list Libmesh-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-devel
