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From Euan Guttridge <EGuttri...@buildonline.com>
Subject RE: tomcat jitters, then hangs - please help
Date Fri, 24 Oct 2003 11:36:26 GMT
Nice, and at least you got the speed to post issue sorted..

-----Original Message-----
From: Ryan Lissack [mailto:rlissack@buildonline.com] 
Sent: 24 October 2003 12:35
To: 'Tomcat Users List'
Subject: RE: tomcat jitters, then hangs - please help


Hi all,

Just an update on issues we were experiencing when running Tomcat on Red Hat
9.

As mentioned previously in this thread, the problem appears to be with a bug
in NPTL. In order to revert to standard Linux threads you can set the
LD_ASSUME_KERNEL environment variable to 2.2.5 or 2.4.1

We set LD_ASSUME_KERNEL to 2.4.1 on one of our servers one week ago and,
since then, have *not* had one outage, our other machine which does not have
the environment variable set has had numerous outages during the period.  

We can confirm that this does appear to resolve the issue.

I believe Noam Camiel found that setting LD_ASSUME_KERNEL to 2.2.5 also
works.

I would like to say a special thank you to Remy for all his help during this
period.

Best regards,
Ryan


-----Original Message-----
From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
Sent: 15 October 2003 14:07
To: Tomcat Users List
Subject: RE: tomcat jitters, then hangs - please help



Howdy,
Cool, please keep us updated ;)  I want these linux questions better
documented in the list archives ;)

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Noam Camiel [mailto:noam@mdrm.com]
>Sent: Wednesday, October 15, 2003 6:37 AM
>To: Euan Guttridge; Tomcat Users List
>Subject: Re: tomcat jitters, then hangs - please help
>
>Hi Euan
>
>Please note the server is now up for 48 hours strait.
>The change I've made is I've set LD_ASSUME_KERNEL to 2.2.5
>I will update again in another 48 hours or if the server hangs,
whichever
>comes first.....
>
>Regards,
>Noam
>
>----- Original Message -----
>From: "Euan Guttridge" <EGuttridge@buildonline.com>
>To: <noam@mdrm.com>
>Sent: Wednesday, October 15, 2003 9:42 AM
>Subject: FW: tomcat jitters, then hangs - please help
>
>
>> Hi Noam,
>>
>> I work with Ryan on tomcat issues. I would be grateful if you would
let
>me
>> know if your tomcat installation is *still* up (another 24 hours)
since
>the
>> NPTL change as below.
>>
>>
>> Regards,
>> Euan
>>
>> -----Original Message-----
>> From: Noam Camiel [mailto:noam@mdrm.com]
>> Sent: 14 October 2003 14:46
>> To: Tomcat Users List
>> Subject: Re: tomcat jitters, then hangs - please help
>>
>>
>> Hi,
>>
>> On Friday, October 10, 2003 11:09 AM "Ryan Lissack" 
>> <rlissack@buildonline.com>  wrote:
>>
>> > 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.
>>
>> setting the LD_ASSUME_KERNEL variable, the server is now running over
24
>> hours strait.
>> Still, nothing conclusive as of yet......
>> Ryan, thanks for the information above.  Do you have move information 
>> regarding this configuration? do you still encounter problems?
>>
>>
>> On Monday, October 13, 2003 9:59 PM "Joe Zendle"
><joe.zendle@vericept.com>
>> wrote:
>>
>> > We had the same problem w/ TC 4.1.27, sun jvm 1.4.2 and redhat 9.
The
>> > thing wouldn't work for more than about 12 hours. IMHO, there are
some
>> > fundamental problems with tomcat as of late. Hate to say it but we 
>> > solved the problem by throwing away tomcat and using jetty! We are
very
>> > pleased so far. Jetty is very fast and about 1/3 the memory
footprint.
>> >
>> > Good luck.
>>
>>
>> Hi Joe,
>> Thanks for sharing the info, I am considering what you suggest as
well.
>> As a last try before moving away from Tomcat, I'm trying out the
>suggestion
>> from Ryan above.
>> Regards,
>> Noam.
>>
>>
>>
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>
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