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From "Noam Camiel" <n...@mdrm.com>
Subject Re: tomcat jitters, then hangs - please help
Date Mon, 20 Oct 2003 11:36:38 GMT
Hi folks,
A week's gone by and all seems fine.  Server is stable and working properly.
Thanks for all who helped out! Ryan, Remi Yoav and Arthur, many thanks.
It may be a good idea to document this for others who may stumble over this
problem.
All the best
Noam Camiel

Details:
Problem: Tomcat Server becomes unresponsive to new requests after several
hours, regardless of load.
OS RH9; Tomcat 4 or 5; VM Sun or IBM (JDK 1.4)
Solve: (tcsh): setenv LD_ASSUME_KERNEL 2.2.5

----- Original Message -----
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, October 15, 2003 3:06 PM
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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