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On 04/20/10 13:30, Matt Khan wrote:
<blockquote
cite="mid:OFE7E9B80D.EF6A1B05-ON8025770B.006FA02B-8025770B.0070A8F6@db.com"
type="cite"><br>
<font face="Courier New" size="2">>> You might need a VM with
this
fix. 6782663: Data produced by PrintGCApplicationConcurrentTime and
PrintGCApplicationStoppedTime
is not accurate<br>
OK so that's the early access for 6u21 by the looks of it. I'll repeat
a run on that JVM (and with the safepoint stats).</font>
<br>
<br>
<font face="Courier New" size="2">>> If the log doesn't show a
[GC...] line at a safepoint, then there is not GC activity during it </font>
<br>
<font face="Courier New" size="2">does this mean that the actual time
stopped due to GC is the one immediately after the GC line? </font></blockquote>
<br>
As you can see more than GC can contribute to a STW so the "time
stopped" might include<br>
other times that don't log any message. The GC entries in the log
print their own times.<br>
<blockquote
cite="mid:OFE7E9B80D.EF6A1B05-ON8025770B.006FA02B-8025770B.0070A8F6@db.com"
type="cite"><br>
<br>
<font face="Courier New" size="2">>> You could use
-XX:+PrintSafepointStatistics
etc. to figure these out.</font>
<br>
<font face="Courier New" size="2">which other flags should I look at?</font>
<br>
</blockquote>
I don't know of any others.<br>
<blockquote
cite="mid:OFE7E9B80D.EF6A1B05-ON8025770B.006FA02B-8025770B.0070A8F6@db.com"
type="cite"><br>
<font face="Courier New" size="2">Cheers</font>
<br>
<font face="Courier New" size="2">Matt</font>
<br>
<font face="sans-serif" size="2"><br>
Matt Khan<br>
--------------------------------------------------<br>
GFFX Auto Trading<br>
Deutsche Bank, London</font>
<br>
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