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From: Julian S. <js...@ac...> - 2006-03-28 16:46:10
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> r5774. memcheck is now in the same ballpark as --tool=none which it > never has been before. Ashley - you mean when you do MPI bandwidth tests? 'cos although memcheck is much improved as a result of this, it's still nowhere near as fast as 'none' for computation. For a MPI test though, in which mostly you're waiting for the nic, all that V is really doing is painting memory as it goes in/out, as per your ioctls wrappers, and for this particular case - changing memory permissions - Nick's work does indeed give a big speedup. J |