<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear PETSc-users,<div><br></div><div>i'm trying to work with PETSc on a ccNuma-system, where i am confronted with severe performance problems.</div><div>Is there anyone using PETSc on e.g. a SGI Altix System?</div><div>Which are the best kernels to use on cache coherent systems? </div><div>The fortran kernels produces many cache misses (in functions like fsolve and fmatmul) slowing down a 3GFLOP/s machine to about 200MFLOP/s .</div><div>Has anyone any advice to increase speed on ccNuma-system?</div><div><br></div><div>Sincerly,</div><div><br></div><div>Christoph Statz</div><div><br><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><br class="Apple-interchange-newline"> </div><br></div></body></html>