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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: tomcat jitters, then hangs - please help
Date Fri, 10 Oct 2003 12:58:13 GMT

Howdy,
Please also post an update if you DON'T have any problems, so that the
few good souls who actually search list archives before posting
questions can have a reference in the future ;)  Thanks,

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Ryan Lissack [mailto:rlissack@buildonline.com]
>Sent: Friday, October 10, 2003 5:09 AM
>To: 'Tomcat Users List'
>Subject: RE: tomcat jitters, then hangs - please help
>
>Hi Noam,
>
>Remy pointed out to me previously that RH9 uses a new form of threading
and
>based on this we have done some investigation.
>
>RH9 uses NTPL (Native POSIX Thread Library)
>http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/release-notes/x86
/
>
>It is possible to revert to the older form of threading,
"LinuxThreads", by
>setting an environment variable, namely:
>LD_ASSUME_KERNEL=<kernel-version>
>- 2.4.1 - Linuxthreads with floating stacks
>- 2.2.5 - Linuxthreads without floating stacks
>
>This does not revert back to an older kernel, it just changes the GNU C
>library used http://www-106.ibm.com/developerworks/java/library/j-jtc/
>
>We will be testing with these settings starting today and, if we
continue
>to
>have problems, we will be trying another distro.
>
>Ryan
>
>
>
>More NTPL info
http://www.redhat.com/partners/pdf/POSIX_Linux_Threading.pdf
>
>
>-----Original Message-----
>From: Noam Camiel [mailto:noam@mdrm.com]
>Sent: 04 April 2003 18:36
>To: Tomcat Users List
>Subject: Re: tomcat jitters, then hangs - please help
>
>
>On Thursday, October 09, 2003 5:11 PM "Ryan Lissack"
><rlissack@buildonline.com> wrote:
>> Hi Noam,
>>
>> We have experienced similar problems.  You will notice in the thread
dump
>> that there is no thread from the connectors thread pool waiting on an
>> accept
>
>I see your what you mean, I compared the thread dump to a "good" dump
when
>the server is operational and there indeed I found a thread from the
>connectors thread pool waiting on accept:
>
>3XMTHREADINFO      "http80-Processor24" (TID:0x100688E0,
>sys_thread_t:0x87810C0, state:R, native ID:0x41CCCF40) prio=5
>4XESTACKTRACE          at java.net.PlainSocketImpl.socketAccept(Native
>Method)
>
>This does not appear to exist in the "bad" dump.
>
>> What OS are you on, RH9??
>
>Yes, Im on RH9.
>
>Any ideas why this could happen?  could it be some system resource
limit?
>Is your application an intensive app? My application is not an
intensive
>one
>and the hangs occur hours after i start the server (usually a day
later).
>
>Thanks for the info, i'd be happy to hear any suggestions.
>Noam
>
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