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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: tomcat jitters, then hangs - please help
Date Mon, 20 Oct 2003 13:05:55 GMT

Howdy,
Yup, it's good to document, so I'm glad you did.  Now if only people
would search the archives before asking questions for the zillionth
time, we'd be in good shape ;)  Glad it's working for you.

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Noam Camiel [mailto:noam@mdrm.com]
>Sent: Monday, October 20, 2003 7:37 AM
>To: Tomcat Users List
>Subject: Re: tomcat jitters, then hangs - please help
>
>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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