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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>All<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I spend much time analyzing the behavior of the various
generations. Their optimal sizing provides good <st1:PersonName w:st="on">perf</st1:PersonName>ormance
improvements.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have several questions:<o:p></o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I add the following parameters
to get good GC logs: “-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+PrintGCApplicationConcurrentTime
-XX:+PrintGCApplicationStoppedTime". I wonder if some additional
options are useful. By example, the timestamps only track time since the
JVM was started. To correlate an incident with application time stamps, it
would be much more useful to have those time stamps use regular dates (2008-06-17
11:58:11,23 by example).<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I have not found a good tool to
analyze these logs and have to do that analysis by hand. HPJTune (HP) and
GCViewer (TagTraum) are sometimes good enough but does not work when using
more refined GC options like Parallel New Garbage Collection.. PrintGCStats
is a last one that I have not found very useful either. Are there other
tools available that someone could recommend?<o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In comparison, the IBM JDK provides a single GC output
format by using the verbose:gc option. IBM provides some very good tools to
analyze those logs. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks in advance for helping tuning the Sun JDK as well as
possible.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This is for Sun JDK 1.5.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Alex Aisinzon<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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style='font-size:8.5pt;font-family:"Microsoft Sans Serif"'><o:p> </o:p></span></font></p>
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style='font-size:12.0pt;font-family:Arial;color:navy;font-weight:bold'><o:p> </o:p></span></font></b></p>
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12.0pt'><o:p> </o:p></span></font></p>
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