<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><blockquote type="cite"><br> The sparse matrix is MUCH to big for the cache so has to stream through from memory,<br>thus the huge number of "cache misses". This same performance issue occurs on<br>all modern systems.<br></blockquote><div><br></div><div>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.</div><div>I don't have performance problems on our Clusters. It is just the "big" machine.</div><div><br></div><div>Christoph</div><div><br></div><div><font class="Apple-style-span" color="#144FAE"><br></font></div><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--</div><div>Christoph Statz</div><div><br></div><div>Institut für Nachrichtentechnik</div><div>Technische Universität Dresden</div><div>01062 Dresden</div><div><br></div><div>Email: <a href="mailto:christoph.statz@mailbox.tu-dresden.de">christoph.statz@mailbox.tu-dresden.de</a></div><div>Phone: +49 351 463 32287</div><div><br></div></div></div></div></div></div></span></div></body></html>