Jrockit 1.4.2:
java.args=-server -DJINTEGRA_NATIVE_MODE -DJINTEGRA_PREFETCH_ENUMS
-Xbootclasspath/a:{application.home}/lib/webchartsJava2D.jar
-Djava.awt.graphicsenv=com.gp.java2d.ExHeadlessGraphicsEnvironment -Xmx800m
-Xms800m -Xgcprio:pausetime -Xverbosetimestamp -Xverboselog:jrockit.txt
-Xgcpause
The GC printout below (jrockit.txt) was from the 3 minute period when the
server was not responding.
What was most unusual is that cfstat did show templates processing for a 1
second period once each minute.
So everything would freeze up for 59 seconds, then a burst of templates would
process for 1-2 seconds, then it would freeze up for 59 seconds. It did this 2
or 3 times and then returned to normal.
>What type of GC is it running? What are your JVM settings?
>
>
>
>
>
>
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>-----Original Message-----
>From: Terry Ford
>To: CF-Server
>Sent: Thu Nov 09 21:11:11 2006
>Subject: Server pauses... thoughts?
>
>We are running CFMX 6.1 on linux RHEL4.
>
>Approximately once every 8-12 hours or so our server stops responding for
>about 3 minutes. Symptoms: CF stops processing requests, stops queueing,
>stops timing out requests, stops doing everything.
>
>We are using Jrockit 1.4.2 right now, but it also happens under Sun's JVM
>too.
>
>cfstat 1:
>
>0 11 0 23 -1 -1 127 15 1 137 247 0 0 0
>0 11 0 23 -1 -1 127 15 1 137 247 0 0 0
>0 11 0 23 -1 -1 127 15 1 137 247 0 0 0
>0 11 0 23 -1 -1 127 15 1 137 247 0 0 0
>0 11 0 23 -1 -1 127 15 1 137 247 0 0 0
>... etc.. for 3 minutes.
>
>Then it jumps back to life again, taking off as if nothing ever happened.
>
>I thought perhaps it was a problem with garbage collection, but Jrockit's GC
>debugging looks fine. In fact, it continues to garbage collect during that
>3 minutes, just as it did before the freeze:
>
>[gcpause][Thu Nov 9 16:00:07 2006][13912] old collection phase 0-2 pause
>time: 7.998000 ms, (start time: 21226.183 s)
>[gcpause][Thu Nov 9 16:00:07 2006][13912] total mark time: 530.209 ms
>[gcpause][Thu Nov 9 16:00:07 2006][13912] total sweep time: 5.027 ms
>[gcpause][Thu Nov 9 16:00:07 2006][13912] old collection phase 4-0 pause
>time: 27.229000 ms, (start time: 21226.692 s)
>[gcpause][Thu Nov 9 16:00:07 2006][13912] (pause includes compaction: 0.000
>ms (no compaction), update ref: 0.000 ms)
>[gcpause][Thu Nov 9 16:01:07 2006][13912] old collection phase 0-2 pause
>time: 10.371000 ms, (start time: 21286.774 s)
>[gcpause][Thu Nov 9 16:01:08 2006][13912] total mark time: 452.252 ms
>[gcpause][Thu Nov 9 16:01:08 2006][13912] total sweep time: 39.125 ms
>[gcpause][Thu Nov 9 16:01:08 2006][13912] old collection phase 4-0 pause
>time: 62.351000 ms, (start time: 21287.204 s)
>[gcpause][Thu Nov 9 16:01:08 2006][13912] (pause includes compaction:
>30.253 ms (external), update ref: 4.000 ms)
>[gcpause][Thu Nov 9 16:02:08 2006][13912] old collection phase 0-2 pause
>time: 15.459000 ms, (start time: 21347.301 s)
>[gcpause][Thu Nov 9 16:02:09 2006][13912] total mark time: 581.907 ms
>[gcpause][Thu Nov 9 16:02:09 2006][13912] total sweep time: 147.318 ms
>[gcpause][Thu Nov 9 16:02:09 2006][13912] old collection phase 4-0 pause
>time: 181.771000 ms, (start time: 21347.849 s)
>[gcpause][Thu Nov 9 16:02:09 2006][13912] (pause includes compaction:
>131.157 ms (internal), update ref: 16.001 ms)
>[gcpause][Thu Nov 9 16:03:09 2006][13912] old collection phase 0-2 pause
>time: 16.870000 ms, (start time: 21408.057 s)
>
>So the JVM appears to be fine. The problem is not with the database --
>there are no outstanding queries when this occurs. The network connection
>is fine. The disk is fine. There's a ton of memory. There's no paging
>going on.
>
>So... does anyone have any idea what might be causing these infrequent yet
>long pauses?
>
>Regards,
>Terry
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