> > The sparse matrix is MUCH to big for the cache so has to stream > through from memory, > thus the huge number of "cache misses". This same performance issue > occurs on > all modern systems.
Yes, of course. But on most modern systems i don't have the "problem" that the cache is held coherent which causes a bunch of extra cycles penalty. I don't have performance problems on our Clusters. It is just the "big" machine. Christoph -- Christoph Statz Institut f?r Nachrichtentechnik Technische Universit?t Dresden 01062 Dresden Email: christoph.statz at mailbox.tu-dresden.de Phone: +49 351 463 32287 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20081014/e756ad84/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: PGP.sig Type: application/pgp-signature Size: 194 bytes Desc: This is a digitally signed message part URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20081014/e756ad84/attachment.pgp>
