<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><div>The FAQ about the kind of parallel computers or clusters needed<br />to use PETSc states:<br /><br />"any ethernet (even 10 GigE) simply cannot provide the needed performance."<br /><br />Does this statement still hold now that 100 GigE is common?<br /><br />The broader question is that we are buying a new cluster to run<br />our in-house CFD solver ReFRESCO. Typical production runs involve<br />meshes up-to a few hundred million cells with half a dozen to a<br />dozen equations. Most of the time is spend in KSPSolve. What kind<br />of interconnect should we consider?<br /><br />Chris </div><div dir="ltr" style="mso-line-height-rule:exactly;-webkit-text-size-adjust:100%;font-size:1px;direction:ltr;"><table dir="ltr" cellpadding="0" cellspacing="0" border="0" style="width:100%;direction:ltr;border-collapse:collapse;font-size:1px;"><tr style="font-size:0;"><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;line-height:normal;"><tr style="font-size:0;"><td align="left" style="padding:10px 0;vertical-align:top;"><p style="margin-top:0px;margin-bottom:0px;"><img src="cid:image916957.png@A00F0F63.F3F21C65" width="125" height="40" border="0" alt="" style="width:125px;min-width:125px;max-width:125px;height:40px;min-height:40px;max-height:40px;font-size:0;" /></p></td></tr></table></td></tr><tr style="font-size:0;"><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" 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