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ok, that might be it. We generate code in a singleton classloader, I
suspect that each thread is generating its' own getters. I suspect that
created singleton classloader is not getting GCd and releasing the perm
gen. I'm not sure how to fix this. You can check this yourself by
attaching a jprofiler instance (available for free trial) and looking
at the object counts.<br>
<br>
I've tracked down the concurrency issue. The Rete node has a HashMap of
ObjectTypeNodes that is built on the fly, that was global to the
rulebase. I'll have to make it local to the working Memory. I'll fix
that today.<br>
<br>
Mark<br>
s erel wrote:
<blockquote
cite="mid:1a1500b50707040618k561aa016w3f4d48e0b3c7f0c5@mail.gmail.com"
type="cite">
<div>Our server creates hundreds of stateful rule sessions
concurrently. Each created rule seesion is specific to a thread. We did
not encounter </div>
<div>any memory problems with the previous version. As I've said,
it's difficult (actually, impossible) for me to provide you with a self
contained example </div>
<div>since the drl is complicated and contains dozens of complex
objects. However, I am ready to provide you with any information that
can help</div>
<div>us in that manner.</div>
<div>I've also mentioned in the earlier threads the concurrency
problem I've encountered with AbstractHashTable. </div>
<div>Can this has something to do with it?</div>
<div><br>
</div>
<div><span class="gmail_quote">On 7/4/07, <b class="gmail_sendername">Mark
Proctor</b> <<a moz-do-not-send="true"
href="mailto:mproctor@codehaus.org">mproctor@codehaus.org</a>>
wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff">I don't beleive there is
anything in 4.0 that is going to cause such quick loss of permgen. Can
you create a self contained example that illustrates this behaviour? So
we can reproduce this?
<br>
<span class="sg"><br>
Mark</span>
<div><span class="e" id="q_1139121159cb6e46_2"><br>
s erel wrote:
<blockquote type="cite">
<div>We've tried to increase the permGen to 256mb. It did not
help and the space run out really fast.</div>
<div>Regarding MVEL, is turning code generation off something
that can (or will) be done with a configuration parameter/factory
method or do I need to track down all the places in the code?</div>
<div> </div>
<div>We did not experience such memory behavior with the previous
version we used (3.06) when running the same tests.</div>
<div>Bugs in 3.06 (no longer present in 4M3) are forcing us to
upgrade.</div>
<div> </div>
<div>Is there another reason for such behaviour?</div>
<div>Should we wait for release candidate?</div>
<div><br>
</div>
<div><span class="gmail_quote">On 7/4/07, <b
class="gmail_sendername">Mark Proctor</b> <<a moz-do-not-send="true"
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org
</a>> wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff">increase your perm gen
space,or use the MVEL dialect with code generation off.
<div><span><br>
<br>
Mark<br>
s erel wrote:
<blockquote type="cite">
<div>Hello,</div>
<div> </div>
<div>During capacity tests we've received permGen OOM
exception. The occupied space in the permGen area increases rapidly.
Any opinions?</div>
<br>
<br>
<div><span class="gmail_quote">On 7/3/07, <b
class="gmail_sendername">s erel</b> <<a moz-do-not-send="true"
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:erelsagi@gmail.com" target="_blank">erelsagi@gmail.com</a>>
wrote: </span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div>In our project we are creating a
StatefulRuleSession and saving it in a per-thread context (i.e. Each
thread has it's own StatefulRuleSession):</div>
<div> </div>
<div>ruleServiceProvider.getRuleRuntime().createRuleSession(contextName,
properties, RuleRuntime.STATEFUL_SESSION_TYPE);</div>
<div> </div>
<div>When a thread session ends, we are calling release on
the previously created StatefulRuleSession.</div>
<div> </div>
<div> </div>
<div>Changing the following lines:</div>
<div> </div>
<div>
<p>public abstract class AbstractHashTable<br>
</p>
<p>...</p>
<p> public Iterator iterator() {<br>
// if ( this.iterator == null ) {<br>
// this.iterator = new HashTableIterator( this );<br>
// }<br>
//<br>
// this.iterator.reset();<br>
// return this.iterator;</p>
<p> HashTableIterator iterator = new
HashTableIterator(this);<br>
iterator.reset();</p>
<p> return iterator;<br>
}</p>
Seems to solve the problem I've encountered. What's your opinion?<br>
<br>
</div>
<div><span>
<div><span class="gmail_quote">On 7/2/07, <b
class="gmail_sendername">Mark Proctor</b> <<a moz-do-not-send="true"
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org
</a>> wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff">a working memory
should be single threaded, so not sure how this could be a race
condition?<br>
<span><br>
Mark</span>
<div><span><br>
s erel wrote:
<blockquote type="cite">
<div>I've done a little debugging. The code fails
in the following segment:</div>
<div> </div>
<div>public static class HashTableIterator</div>
<div>...</div>
<div> while ( this.entry == null ) {<br>
this.row++;<br>
if ( this.row == this.length ) {<br>
return null;<br>
}<br>
this.entry = this.table[this.row]; <strong>//
---> index out of bounds exception</strong><br>
}</div>
<div>}<br>
</div>
<div>this.row has the same value as this.length despite
the condition above it. Probably a race condition issue.</div>
<div><br>
</div>
<div><span class="gmail_quote">On 7/2/07, <b
class="gmail_sendername">Mark Proctor</b> <<a moz-do-not-send="true"
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org
</a>> wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff">Not really :(<br>
<br>
In your situation I tend to keep removing rules and data while still
making sure the error happens, to get it down to a minimum. Please do
try, as this isn't an error that should happen. Or alterntaively you
can open drools-core and drools-compiler in eclipse and execuse and
debug this yourself - in your situation this might best. you can put in
a breakpoint to listen for that particular exception. <br>
<span><br>
Mark</span>
<div><span><br>
s erel wrote:
<blockquote type="cite">
<div>It's hard for me to provide a self contained
project. The drl is long and uses several business objects. It's the
same drl as we've been using for 306 minus the keyword changes. </div>
<div>Is there anything else i can check or provide
you in order to solve this matter.</div>
<div> </div>
<div>Thanks<br>
</div>
<div><span class="gmail_quote">On 7/1/07, <b
class="gmail_sendername">Mark Proctor</b> <<a moz-do-not-send="true"
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:mproctor@codehaus.org" target="_blank">mproctor@codehaus.org
</a>> wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff">Can you
provide us a self contained project which creates this error? Unless we
can recreate it, it will be very hard to track it down. Please attach
the project to a jira and we'll make it a priority. <br>
<br>
Mark<br>
s erel wrote:
<blockquote type="cite">
<div><span>
<div>Hello,</div>
<div> </div>
<div>I've just started integrating MR3 into my
project (I've previously used 3.06). The drl compiles and everything
seems fine, but during </div>
<div>tests the following exception is thrown
for time to time:</div>
<div> </div>
<div>java.lang.ArrayIndexOutOfBoundsException:
17<br>
at
org.drools.util.AbstractHashTable$HashTableIterator.next(AbstractHashTable.java:250)<br>
at org.drools.reteoo.Rete$ObjectTypeConf.buildCache(Rete.java:434)<br>
at
org.drools.reteoo.Rete$ObjectTypeConf.getObjectTypeNodes(Rete.java:425)<br>
at org.drools.reteoo.Rete.assertObject(Rete.java:172)<br>
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)<br>
at
org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute
(ReteooWorkingMemory.java:163)<br>
at
org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1135)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:781)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:584)<br>
at
org.drools.jsr94.rules.StatefulRuleSessionImpl.addObject(StatefulRuleSessionImpl.java:162)</div>
<div> </div>
<div>This only happens during high load tests.</div>
<div>Can anyone help me?</div>
<div> </div>
<div>Thanks</div>
<div> </div>
</span></div>
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