<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
Re: Cpu 100% and GC is running
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/peterj">Peter Johnson</a> in <i>Performance Tuning</i> - <a href="http://community.jboss.org/message/645089#645089">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>As for setting the survivor ratio, look at the GC data you posted. What is the ratio of the young generation size before GC and the largest size after GC? The after GC size is entirely within a survivor space. I would assume a max survivor space size of about 1.5 times the largest after GC size you see (1.5 x 36MB ~= 50MB), then 1278MB / 50MB ~= 25, which is what I would set the ratio to.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>You need to also set the tenuruing threshold. These white papers might help:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Java Garbage Collection Statistical Analysis 101</p><p>Java Garbage Collection Performance Analysis 201</p><p>at <a class="jive-link-external-small" href="http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10">http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10</a></p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/645089#645089">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in Performance Tuning at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2078">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>