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From "Asankha C. Perera (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HTTPCORE-155) Performance issues with IBM JRE 6.0
Date Thu, 04 Dec 2008 11:59:44 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Asankha C. Perera updated HTTPCORE-155:
---------------------------------------

    Attachment: javacore.20081203.153723.32300.0001.txt

I am seeing a deadlock with the IBM JDK with Apache Synapse, which leads to very low performance.
This is not seen with the Sun JDK of the same version.

1LKDEADLOCK    Deadlock detected !!!
NULL           ---------------------
NULL           
2LKDEADLOCKTHR  Thread "http-Listener I/O dispatcher-1" (0x0000000000765600)
3LKDEADLOCKWTR    is waiting for:
4LKDEADLOCKMON      sys_mon_t:0x00007F5B9CF59490 infl_mon_t: 0x00007F5B9CF59510:
4LKDEADLOCKOBJ      sun/nio/ch/SelectionKeyImpl@00007F5BA4D11160/00007F5BA4D11178: 
3LKDEADLOCKOWN    which is owned by:
2LKDEADLOCKTHR  Thread "HttpClientWorker-4" (0x00007F5B9CF21100)
3LKDEADLOCKWTR    which is waiting for:
4LKDEADLOCKMON      sys_mon_t:0x0000000000D0D668 infl_mon_t: 0x0000000000D0D6E8:
4LKDEADLOCKOBJ      java/util/Collections$UnmodifiableSet@00007F5BA41A1BB0/00007F5BA41A1BC8:

3LKDEADLOCKOWN    which is owned by:
2LKDEADLOCKTHR  Thread "http-Listener I/O dispatcher-1" (0x0000000000765600)
NULL           

> 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: 4.0-rc1
>
>         Attachments: javacore.20081203.153723.32300.0001.txt
>
>
> 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/Util$1@00B09208/00B09214: Flat locked by "I/O dispatcher
7" (0x2A208E00), entry count 1
> 3LKWAITERQ            Waiting to enter:
> 3LKWAITER                "pool-2-thread-5" (0x2AEECE00)
> And here's the thread that currently has this monitor locked:
> 3XMTHREADINFO      "I/O dispatcher 7" TID:0x2A208E00, j9thread_t:0x2A6EC73C, state:R,
prio=5
> 3XMTHREADINFO1            (native thread ID:0x830, native priority:0x5, native policy:UNKNOWN)
> 4XESTACKTRACE          at sun/nio/ch/WindowsSelectorImpl$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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