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https://issues.apache.org/jira/browse/HTTPCORE-155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657334#action_12657334
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Oleg Kalnichevski commented on HTTPCORE-155:
--------------------------------------------
Marc,
This sounds great! Many thanks for such a thorough analysis of the problem.
However, I still would like to release HttpCore 4.0 as is, and resolve this
issue in the course of the 4.1 development. If everything goes well, HttpCore
4.0 should be released by the end of January 2009
I took a cursory look at patch. It looks fine conceptually but still could use
some more work on the code level. For a start it would be great to make the
selectorQueues non-static.
Cheers,
Oleg
> Performance issues with IBM JRE 6.0
> -----------------------------------
>
> Key: HTTPCORE-155
> URL: https://issues.apache.org/jira/browse/HTTPCORE-155
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.0-beta1
> Environment: Windows 2003 SP2 - IBM J2RE 1.6.0 build 2.4 - HTTPCore
> Beta1 - Dual Core CPU 3.0Ghz - 1Gbps networking
> Reporter: Tom McSorley
> Fix For: 4.1
>
> Attachments: AbstractIOReactor.diff, AbstractIOReactor.java,
> IOSessionImpl.diff, IOSessionImpl.java,
> javacore.20081203.153723.32300.0001.txt, patch.08-12-17.tar.gz
>
>
> I'm issuing a second HTTP Request on a connection that has very recently
> returned a null for the submitRequest() call... this 2nd request is being
> issued approximately 500ms after the submitRequest() null is returned... so
> the connection has just been established, an HTTP Request/Response-200 cycle
> has completed just prior to this 2nd request being issued. I'm seeing
> unusually long delays in the requestOutput() call (verified by surrounding
> timing prints)... that can range anywhere from a few milliseconds on up to 60
> seconds... It eventually unwinds, and then the submitRequest() is called...
> this 2nd request is dispatched and works fine... but, it is delayed
> considerably... Is this a known issue and is there a possible work-around?
> Here's the JVM related thread information:
> The thread being delayed and stuck in the requestOutput() call for a long
> time (mostly longer than 5 seconds):
> 3XMTHREADINFO "pool-2-thread-5" TID:0x2AEECE00, j9thread_t:0x2A7189A8,
> state:B, prio=5
> 3XMTHREADINFO1 (native thread ID:0x1B44, native priority:0x5,
> native policy:UNKNOWN)
> 4XESTACKTRACE at
> sun/nio/ch/SelectionKeyImpl.interestOps(SelectionKeyImpl.java:60)
> 4XESTACKTRACE at
> org/apache/http/impl/nio/reactor/IOSessionImpl.setEvent(IOSessionImpl.java:113)
> 4XESTACKTRACE at
> org/apache/http/impl/nio/NHttpConnectionBase.requestOutput(NHttpConnectionBase.java:158)
> .... (non important stack information removed)
> 4XESTACKTRACE at
> java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
> 4XESTACKTRACE at java/lang/Thread.run(Thread.java:735)
> Here's the monitor that this thread is blocked and waiting on:
> 2LKMONINUSE sys_mon_t:0x2A708AF8 infl_mon_t: 0x2A708B30:
> 3LKMONOBJECT sun/nio/ch/uti...@00b09208/00B09214: Flat locked by "I/O
> dispatcher 7" (0x2A208E00), entry count 1
> 3LKWAITERQ Waiting to enter:
> 3LKWAITER "pool-2-thread-5" (0x2AEECE00)
> And here's the thread that currently has this monitor locked:
> 3XMTHREADINFO "I/O dispatcher 7" TID:0x2A208E00, j9thread_t:0x2A6EC73C,
> state:R, prio=5
> 3XMTHREADINFO1 (native thread ID:0x830, native priority:0x5,
> native policy:UNKNOWN)
> 4XESTACKTRACE at
> sun/nio/ch/WindowsSelectorImpl$SubSelector.poll0(Native Method)
> 4XESTACKTRACE at
> sun/nio/ch/WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:308(Compiled
> Code))
> 4XESTACKTRACE at
> sun/nio/ch/WindowsSelectorImpl$SubSelector.access$500(WindowsSelectorImpl.java(Compiled
> Code))
> 4XESTACKTRACE at
> sun/nio/ch/WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:162(Compiled
> Code))
> 4XESTACKTRACE at
> sun/nio/ch/SelectorImpl.lockAndDoSelect(SelectorImpl.java:69(Compiled Code))
> 4XESTACKTRACE at
> sun/nio/ch/SelectorImpl.select(SelectorImpl.java:80(Compiled Code))
> 4XESTACKTRACE at
> org/apache/http/impl/nio/reactor/AbstractIOReactor.execute(AbstractIOReactor.java:121)
> 4XESTACKTRACE at
> org/apache/http/impl/nio/reactor/BaseIOReactor.execute(BaseIOReactor.java:70)
> 4XESTACKTRACE at
> org/apache/http/impl/nio/reactor/AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:318)
> 4XESTACKTRACE at java/lang/Thread.run(Thread.java:735)
> I should also note that we're attempting to use 1000 client instances on this
> single system... each with potentially 2 active connections simultaneously...
> there is also virtually no CPU load (i.e. less then 5%) on this system...
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