On Tue, Oct 14, 2008 at 2:06 AM, Christoph Statz <christoph.statz at ifn.et.tu-dresden.de> wrote: > > 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.
Write down the balance between cycles and memory bandwidth for these machines. I am guessing the clusters have better balance since they tend to have slower processors. Matt > 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 > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener
