<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>Re[2]: [Beowulf] What class of PDEs/numerical schemes suitable for GPU clusters</title>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
body {
margin: 5px 5px 5px 5px;
background-color: #ffffff;
}
/* ========== Text Styles ========== */
hr { color: #000000}
body, table /* Normal text */
{
font-size: 9pt;
font-family: 'Courier New';
font-style: normal;
font-weight: normal;
color: #000000;
text-decoration: none;
}
span.rvts1 /* Heading */
{
font-size: 10pt;
font-family: 'Arial';
font-weight: bold;
color: #0000ff;
}
span.rvts2 /* Subheading */
{
font-size: 10pt;
font-family: 'Arial';
font-weight: bold;
color: #000080;
}
span.rvts3 /* Keywords */
{
font-size: 10pt;
font-family: 'Arial';
font-style: italic;
color: #800000;
}
a.rvts4, span.rvts4 /* Jump 1 */
{
font-size: 10pt;
font-family: 'Arial';
color: #008000;
text-decoration: underline;
}
a.rvts5, span.rvts5 /* Jump 2 */
{
font-size: 10pt;
font-family: 'Arial';
color: #008000;
text-decoration: underline;
}
span.rvts6
{
font-weight: bold;
color: #800080;
}
a.rvts7, span.rvts7
{
color: #0000ff;
text-decoration: underline;
}
span.rvts8
{
font-weight: bold;
color: #800080;
}
span.rvts9
{
font-weight: bold;
color: #800000;
}
/* ========== Para Styles ========== */
p,ul,ol /* Paragraph Style */
{
text-align: left;
text-indent: 0px;
padding: 0px 0px 0px 0px;
margin: 0px 0px 0px 0px;
}
.rvps1 /* Centered */
{
text-align: center;
}
--></style>
</head>
<body>
<p>Hallo Mark,</p>
<p><br></p>
<p>Donnerstag, 20. November 2008, meintest Du:</p>
<p><br></p>
<p><span class=rvts6>>> [shameless plug]</span></p>
<p><br></p>
<p><span class=rvts6>>> A project I have spent some time with is showing 117x on a 3-GPU machine over </span></p>
<p><span class=rvts6>>> a single core of a host machine (3.0 GHz Opteron 2222). The code is </span></p>
<p><span class=rvts6>>> mpihmmer, and the GPU version of it. See </span><a class=rvts7 href="http://www.mpihmmer.org">http://www.mpihmmer.org</a><span class=rvts8> for more </span></p>
<p><span class=rvts6>>> details. Ping me offline if you need more info.</span></p>
<p><br></p>
<p><span class=rvts6>>> [/shameless plug]</span></p>
<p><br></p>
<p><span class=rvts9>MH> I'm happy for you, but to me, you're stacking the deck by comparing to a</span></p>
<p><span class=rvts9>MH> quite old CPU. you could break out the prices directly, but comparing 3x</span></p>
<p><span class=rvts9>MH> GPU (modern? sounds like pci-express at least) to a current entry-level</span></p>
<p><span class=rvts9>MH> cluster node (8 core2/shanghai cores at 2.4-3.4 GHz) be more appropriate.</span></p>
<p><br></p>
<p>Instead of benchmarking some CPU vs. some GPU wouldn't it be fairer to </p>
<p><br></p>
<p>a) compare systems of similar costs (1k, 2k, 3k EUR/USD)</p>
<p>b) compare systems with a similar power footprint</p>
<p><br></p>
<p>?</p>
<p><br></p>
<p>What does it help that 3 GPUs are 1000x faster than a Asus Eee PC? </p>
<p><br></p>
<p>Jan</p>
</body></html>