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Hi Hongxi<br>
<br>
Thanks for supplying the patch.<br>
<br>
What Java version are you using? I think that using adaptive
sizing with ParNew has never worked very well. In fact this
feature has been disabled in the main branch about a year ago (I
think it went in to 7u4). See:<br>
<br>
7112413 : JVM Crash, possibly GC-related<br>
<a class="moz-txt-link-freetext" href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7112413">http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7112413</a><br>
<br>
So, I would not recommend using -XX:+UseAdaptiveSizePolicy with
-XX:+UseConcMarkSweepGC. The only supported GC for adaptive size
policy is the parallel GC. Even with your patch I think you will
see crashes if you continue running with the command line you
supplied.<br>
<br>
I have only looked briefly at your patch, but I think that it may
be hiding a problem more than fixing it. I think we should in fact
have max size set up properly. If capacity turns out to be larger
than max size we have a real problem. Just hiding this by updating
the max size seems a bit scary to me.<br>
<br>
Bengt<br>
<br>
<br>
<br>
On 3/19/13 3:48 AM, Daniel D. Daugherty wrote:<br>
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<blockquote cite="mid:5147D218.9060402@oracle.com" type="cite">
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Hongxi,<br>
<br>
I'm redirecting this message to the HotSpot GC OpenJDK alias<br>
and the Serviceability OpenJDK alias. JMX is owned by the<br>
Serviceability team and you've also got some GC questions<br>
here...<br>
<br>
Dan<br>
<br>
P.S.<br>
Bcc'ed the Runtime OpenJDK so you folks know that this message<br>
has been redirected...<br>
<div class="moz-cite-prefix"><br>
On 3/18/13 7:59 PM, 洪熙(hongxi) wrote:<br>
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<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">Hi all</span><span style="font-size:14.0pt;
font-family:宋体">：</span><span style="font-size:14.0pt"
lang="EN-US"></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US"> Sorry if here is not the right place to
submit this small fix. </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">Days ago, some of our systems occur this
exception:</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">2013-01-22
16:59:07,351 ERROR protocol.MBeanServerMessageHandler
{141} - handle message error
objectName=com.alibaba.dragoon:type=GC</span></p>
<p class="MsoNormal"><span lang="EN-US">javax.management.RuntimeErrorException:
java.lang.InternalError: Memory Pool not found</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:858)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:869)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:670)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.MBeanServerMessageHandler.getAttributeInternal(MBeanServerMessageHandler.java:242)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.MBeanServerMessageHandler.handle(MBeanServerMessageHandler.java:113)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.MessageHandlerAdapter.handle(MessageHandlerAdapter.java:53)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.DragoonSession.receiveMessageIntenal(DragoonSession.java:204)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.DragoonSession.receiveMessage(DragoonSession.java:178)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.common.protocol.transport.socket.SocketSessionImpl$1.run(SocketSessionImpl.java:211)</span></p>
<p class="MsoNormal"><span lang="EN-US">Caused by:
java.lang.InternalError: Memory Pool not found</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
sun.management.MemoryPoolImpl.getUsage0(Native Method)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
sun.management.MemoryPoolImpl.getUsage(MemoryPoolImpl.java:77)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.alibaba.dragoon.client.jmx.GC.getEdenSpaceUsed(GC.java:185)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
java.lang.reflect.Method.invoke(Method.java:597)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:93)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:27)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:65)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:216)</span></p>
<p class="MsoNormal"><span lang="EN-US"> at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)</span></p>
<p class="MsoNormal"><span lang="EN-US"> ... 7 more</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">The jvm argument is as bellow</span><span
style="font-size:14.0pt; font-family:宋体">：</span><span
style="font-size:14.0pt" lang="EN-US"></span></p>
<p class="MsoNormal" style="text-align:left" align="left"><span
style="font-size:9.0pt;
font-family:"Helvetica","sans-serif";
color:black" lang="EN-US">/usr/java/bin/java -server -Xmx5g -Xms5g -Xmn512m -XX:PermSize=128m -Xss256k -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection</span></p>
<p class="MsoNormal" style="text-align:left" align="left"><span
style="font-size:9.0pt;
font-family:"Helvetica","sans-serif";
color:black" lang="EN-US"> -XX:+UseFastAccessorMethods -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCompressedOops -XX:ParallelGCThreads=4 -XX:+UseAdaptiveSizePolicy</span></p>
<p class="MsoNormal" style="text-align:left" align="left"><span
style="font-size:9.0pt;
font-family:"Helvetica","sans-serif";
color:black" lang="EN-US"> -Dcom.sun.management.jmxremote.port=1100 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname=localhost </span></p>
<p class="MsoNormal" style="text-align:left" align="left"><span
style="font-size:9.0pt;
font-family:"Helvetica","sans-serif";
color:black" lang="EN-US">-Dhummock.output.logs=/home/admin/output/logs -Djava.awt.headless=true -Djava.net.preferIPv4Stack=true </span><span
style="font-size:9.0pt;
font-family:"Verdana","sans-serif";
color:black" lang="EN-US"></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">At last, we found it’s possible a jvm bug,
when UseAdaptiveSizePolicy + ParNew, if the eden is
expanded the max size of eden’s ContiguousSpacePool will
not be updated, perhaps the commited is larger than
max_size. Though at last I know UseAdaptiveSizePolicy has
some problems with CMS and it has been disabled in the
latest jdk7u, I think I should submit a patch to fix this
small bug. My patch is in the attachment.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">Regrads</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"
lang="EN-US">hongxi</span></p>
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