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Denny,<br>
<br>
Does you application use JNI critical regions?<br>
<tt>(GetPrimitiveArrayCritical</tt> or <tt>GetStringCritical)</tt><br>
<br>
What jdk release is this?<br>
<br>
Jon<br>
<tt><br>
</tt>
<div class="moz-cite-prefix">On 1/23/2014 12:38 AM, Denny Kettwig
wrote:<br>
</div>
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<p class="MsoNormal"><span lang="DE">Hey folks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal">in one of our recent cluster systems we
found 2 unexplainable events within the GC logs. I’d like to
address these events to you and ask for your advice. We are
running a clustered jBoss System with 4 nodes, every node has
the same configuration. We use the following parameters:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Xms10g <o:p></o:p></p>
<p class="MsoNormal">-Xmx10g<o:p></o:p></p>
<p class="MsoNormal">-Xmn3g<o:p></o:p></p>
<p class="MsoNormal">-Xss2048k<o:p></o:p></p>
<p class="MsoNormal">-XX:+ExplicitGCInvokesConcurrent<o:p></o:p></p>
<p class="MsoNormal">-XX:+CMSClassUnloadingEnabled<o:p></o:p></p>
<p class="MsoNormal">-XX:+UseParNewGC<o:p></o:p></p>
<p class="MsoNormal">-XX:+UseConcMarkSweepGC<o:p></o:p></p>
<p class="MsoNormal">-XX:ParallelGCThreads=22<o:p></o:p></p>
<p class="MsoNormal">-XX:SurvivorRatio=8<o:p></o:p></p>
<p class="MsoNormal">-XX:TargetSurvivorRatio=90<o:p></o:p></p>
<p class="MsoNormal">-XX:PermSize=512M<o:p></o:p></p>
<p class="MsoNormal">-XX:MaxPermSize=512m<o:p></o:p></p>
<p class="MsoNormal">-Dsun.rmi.dgc.client.gcInterval=3600000 <o:p></o:p></p>
<p class="MsoNormal">-Dsun.rmi.dgc.server.gcInterval=3600000<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Event 1<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The first event is a very frequent CMS
collections on the first node for about 11 hours. We are
talking here about a peak value of 258 CMS collections per
hour. From my knowledge this event starts without any reason
and ends without any reason since the old space is below 10%
usage in this time frame. I do not know what might have caused
this CMS collection. We already experienced similar events on
this cluster in the past, but at a much higher heap usage
(above 90%) and under high load with most likely a huge heap
fragmentation and the frequent CMS collections ended with a
single very long Full GC that defragmented the heap. In the
current event all this is not the case.
<b>I attached the relevant part of the GC log</b>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Event 2<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The second event is just as confusing for
me as the first one. At a certain point in time a full GC
takes place on
<b>all 4 Nodes </b>and I cannot find a reason for it. Here
are the relevant parts:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">N1 <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:43:28.041+0100:
768231.382: [GC 768231.383: [ParNew:
2618493K->92197K(2831168K), 0.3007160 secs]
3120456K->594160K(10171200K), 0.3017204 secs] [Times:
user=0.91 sys=0.00, real=0.30 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:45:31.864+0100:
768355.209: [Full GC 768355.210: [CMS:
501963K->496288K(7340032K), 4.2140085 secs]
1397267K->496288K(10171200K), [CMS Perm :
203781K->178528K(524288K)], 4.2148018 secs] [Times:
user=4.21 sys=0.00, real=4.21 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:52:40.591+0100:
768783.949: [GC 768783.949: [ParNew:
2516608K->48243K(2831168K), 0.2649174 secs]
3012896K->544532K(10171200K), 0.2659039 secs] [Times:
user=0.47 sys=0.00, real=0.27 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">N2 <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:21.524+0100:
765208.310: [GC 765208.311: [ParNew:
924566K->111068K(2831168K), 0.1790573 secs]
1416514K->603015K(10171200K), 0.1797121 secs] [Times:
user=1.08 sys=0.00, real=0.19 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:21.711+0100:
765208.499: [GC [1 CMS-initial-mark: 491947K(7340032K)]
603015K(10171200K), 0.3289639 secs] [Times: user=0.33
sys=0.00, real=0.33 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:22.039+0100:
765208.828: [CMS-concurrent-mark-start]<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:22.616+0100:
765209.405: [CMS-concurrent-mark: 0.577/0.577 secs] [Times:
user=3.53 sys=0.05, real=0.58 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:22.616+0100:
765209.405: [CMS-concurrent-preclean-start]<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:22.647+0100:
765209.430: [CMS-concurrent-preclean: 0.024/0.024 secs]
[Times: user=0.03 sys=0.00, real=0.03 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:22.647+0100:
765209.430: [CMS-concurrent-abortable-preclean-start]<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">CMS:
abort preclean due to time 2013-12-20T04:57:28.060+0100:
765214.848: [CMS-concurrent-abortable-preclean: 4.208/5.418
secs] [Times: user=4.10 sys=0.03, real=5.41 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:28.076+0100:
765214.857: [GC[YG occupancy: 124872 K (2831168
K)]765214.857: [Rescan (parallel) , 0.0580906
secs]765214.916: [weak refs processing, 0.0000912
secs]765214.916: [class unloading, 0.0769742
secs]765214.993: [scrub symbol & string tables,
0.0612689 secs] [1 CMS-remark: 491947K(7340032K)]
616820K(10171200K), 0.2256506 secs] [Times: user=0.48
sys=0.00, real=0.22 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:28.294+0100:
765215.083: [CMS-concurrent-sweep-start]<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:29.043+0100:
765215.834: [CMS-concurrent-sweep: 0.750/0.750 secs] [Times:
user=0.76 sys=0.00, real=0.75 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:29.043+0100:
765215.834: [CMS-concurrent-reset-start]<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T04:57:29.074+0100:
765215.856: [CMS-concurrent-reset: 0.022/0.022 secs] [Times:
user=0.03 sys=0.00, real=0.03 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:47:54.607+0100:
768241.413: [Full GC 768241.414: [CMS:
491947K->464864K(7340032K), 4.5053183 secs]
1910412K->464864K(10171200K), [CMS Perm :
183511K->168997K(524288K)], 4.5059088 secs] [Times:
user=4.49 sys=0.02, real=4.51 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T06:47:59.098+0100:
771845.954: [GC 771845.954: [ParNew:
1507774K->58195K(2831168K), 0.2307012 secs]
1972638K->523059K(10171200K), 0.2313931 secs] [Times:
user=0.37 sys=0.00, real=0.23 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">N3 <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:46:25.441+0100:
767981.526: [GC 767981.526: [ParNew:
2695212K->166641K(2831168K), 0.3278475 secs]
3268057K->739486K(10171200K), 0.3284853 secs] [Times:
user=1.62 sys=0.00, real=0.33 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:49:55.467+0100:
768191.578: [Full GC 768191.578: [CMS:
572844K->457790K(7340032K), 3.7687762 secs]
1216176K->457790K(10171200K), [CMS Perm :
181711K->169514K(524288K)], 3.7692999 secs] [Times:
user=3.76 sys=0.00, real=3.79 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T06:49:59.249+0100:
771795.415: [GC 771795.415: [ParNew:
1585077K->72146K(2831168K), 0.2632945 secs]
2042868K->529936K(10171200K), 0.2639889 secs] [Times:
user=0.41 sys=0.00, real=0.27 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">N4<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:48:21.551+0100:
767914.067: [GC 767914.068: [ParNew:
2656327K->119432K(2831168K), 0.2603676 secs]
3222693K->685799K(10171200K), 0.2609581 secs] [Times:
user=1.14 sys=0.00, real=0.26 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:49:03.939+0100:
767956.457: [Full GC 767956.457: [CMS:
566366K->579681K(7340032K), 6.1324841 secs]
3149011K->579681K(10171200K), [CMS Perm :
190240K->174791K(524288K)], 6.1331389 secs] [Times:
user=6.13 sys=0.00, real=6.13 secs]
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif"">2013-12-20T05:50:10.262+0100:
768022.762: [GC 768022.763: [ParNew:
2516608K->83922K(2831168K), 0.2157015 secs]
3096289K->663603K(10171200K), 0.2162262 secs] [Times:
user=0.41 sys=0.00, real=0.22 secs] <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal">Between these Full GC are only a few
minutes or as between N3 and N4 a few seconds. I made some
research on possible reasons for a Full GC and this is the
list I gathered so far:<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Running
out of old gen</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Running
out of perm gen</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Calling
System.gc() (indicated by System in the ouput)</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">4.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Not
having enough free space in Survivor Space to copy objects
from Eden (promotion failed)</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">5.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Running
out of old gen before a concurrent collection can free it
(Concurrent Mode Failure)</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;text-indent:-.25in;mso-list:l0
level1 lfo2;vertical-align:middle">
<!--[if !supportLists]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><span
style="mso-list:Ignore">6.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black;background:white">Having
high fragmentation and not enough space for a larger object
in old gen</span><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:45.0pt;vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">However
none of these 6 conditions are fulfilled by any of the above
shown full GC. So once again I’m lost and do not have an
explanation for this.<o:p></o:p></span></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">If
you need the full logs for further analysis please let me
know.<o:p></o:p></span></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Kind
Regards<o:p></o:p></span></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Denny
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img
id="Picture_x0020_1"
src="cid:part1.00070000.02090004@oracle.com"
alt="Beschreibung: werum-hr" height="2" width="335"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><img id="Grafik_x0020_1"
src="cid:part2.03080500.05090905@oracle.com"
alt="cid:image002.png@01CEF67E.8AEB4630" height="30"
width="120"><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE">Werum
Software & Systems AG<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE">Wulf-Werum-Strasse
3 | 21337 Lueneburg | Germany<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE">Tel.
+49(0)4131/8900-983 | Fax +49(0)4131/8900-20
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE"><a
moz-do-not-send="true"
href="mailto:denny.kettwig@werum.de">mailto:denny.kettwig@werum.de</a>
|
<a moz-do-not-send="true" href="http://www.werum.de/">http://www.werum.de</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">VAT No. DE
116 083 850 | RG Lueneburg HRB 2262<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Chairman of
Supervisory Board: Johannes Zimmermann<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="DE">Executive
Board: Hartmut Krome, Ruediger Schlierenkaemper, Hans-Peter
Subel<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="vertical-align:middle"><span
style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
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