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From Steven Peterson <>
Subject Tomcat 4.1 and LD_ASSUME_KERNEL=2.4.1
Date Mon, 09 Aug 2004 18:31:57 GMT
Hi all,

I am having problem where Tomcat 4.1.27 just stops after some random 
period of time.  I am on RH9 and JDK 1.4.2.  This seems to be the same 
problem reported earlier and a recommended fix was to set an environment 
variable LD_ASSUME_KERNEL=2.4.1.  Can I simply put an "export 
LD_ASSUME_KERNEL=2.4.1" in my file?

Also, I have heard other recommended values, such as 
LD_ASSUME_KERNEL=2.2.5; how would I find out which one to use?

- Steve


Is this the same problem I also asked yesterday about in thread

"All threads are busy ... servlet status 75"

Somewhere I read about setting the LD_ASSUME_KERNEL to 2.2.5
But I also read somewhere that this didn't help

QM wrote:
 > On Thu, Jun 17, 2004 at 03:54:08PM -0400, Bradley Glonka wrote:
 > : Tomcat installaion on Red Hat Version 9 intermitnently stops
 > : Responding.
 > :        Kernel 2.4.20-9
 > RedHat's custom kernels have backported the NPTL (Native Posix Thread
 > Library) routines from 2.5/2.6.  Set the env var "LD_KERNEL_ASSUME" to
 > "2.4" to make non-NPTL code (such as your JDK) behave.
 > That var may also be called "LD_ASSUME_KERNEL," I forget which. ;)
 > : Can someone suggest how I can troubleshoot the problem.
 > Other than the above: are there differences between the development env
 > and production env, other than the OS?  Differences in RAM or JVM heap
 > settings can cause different GC behavior between the two.
 > Furthermore, what sort of load-testing was done on the app before it
 > went live?
 > -QM
 > --

Steven Peterson, President
Frontier Productions, Inc.
310 Wesley Drive
Chapel Hill, NC 27516
Tel: 919-942-1386
Fax: 919-933-2677

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