With RH8, I assume that at the very least you'll need to set
LD_KERNEL_ASSUME.

I would consider that the first course of action, and likely would not
need to do anything else. I could see hyperthreading a problem if the
kernel didn't support it very well. You could try the latest 2.4.x kernel.

Oscar

On Wed, 14 Jan 2004, Peter Burkholder wrote:

> I've seen similar threads but not a resolution, so I'll raise this issue
> again.
>
> I'm moving our web server and web apps to a new machine, a dual Xeon Redhat
> 8 box. Tomcat 5.0.16 and Tomcat 4.1.29 both handle loads well when using
> the Tomcat HTTP server. But I need to connect Tomcat to an Apache
> front-end, currently 2.0.28. When I use either mod_jk or mod_jk2, the JVM
> crashes after 1970-1980 requests with Signal 11 and this in
> logs/catalina.out:
>
> JVMDG217: Dump Handler is Processing a Signal - Please Wait.
> JVMDG303: JVM Requesting Java core file
> JVMDG304: Java core file written to
> /ucar/dpc/aegean/www/web/www.dlese.org/tomcat/javacore.20040113.142044.6635.txt
> JVMDG215: Dump Handler has Processed Exception Signal 11.
>
> and this exception in the java core:
>
> 2XMEXCPINFO   JVM Exception 0x2 (subcode 0x0) occurred in thread
> "TP-Processor9" (TID:0x10174AB8)
>
> I've seen suggested avenues like:
> # kernel rebuilds (some 2.4.18-2.4.2? kernels had bad thread handling)
> # switching JVMs, e.g., Sun, IBM, BEA JRockit
> # cleaning out the work directory,
> # using or not using LD_ASSUME_KERNEL,
> # disabling hyperthreading,
> # disabling SMP,
> # adjusting heap and stack sizes
> # rebuilding the mod_jk or mod_jk2 connectores.
> # expanding user ulimits
>
> That makes for a huge matrix of possibilities. Any hints on which paths
> might be more fruitful, or others to consider. Are more data needed to help
> isolate this problem?
>
> Thanks,
>
> Peter
>
>
> MISC DETAILS:
> Kernel: Redhat 2.4.20-27.8smp
> JVM: IBMJava2-141
> glibc Version   : 2.3.2
> Memory:  2Gb
> JVM Memory: Behavior is the same with either -Xms250m or -Xms512m
> 2 CPUS /w hyperthreading looks like 4 CPUs
>
> CORE EXCERPTS:  
> 1HPUSERLIMITS User Limits (in bytes except for NOFILE and NPROC) -
> NULL       -----------
> 2HPUSERLIMIT  RLIMIT_FSIZE  : infinity
> 2HPUSERLIMIT  RLIMIT_DATA   : infinity
> 2HPUSERLIMIT  RLIMIT_STACK  : 2093056
> 2HPUSERLIMIT  RLIMIT_CORE   : 0
> 2HPUSERLIMIT  RLIMIT_NOFILE : 1024
> 2HPUSERLIMIT  RLIMIT_NPROC  : 7168
>
> 2HPENVVAR    IBM_JAVA_COMMAND_LINE=/opt/java/java/bin/java -Xmx512m -Djava.end
> orsed.dirs=/opt/tomcat/tomcat4.1/common/endorsed -classpath /opt/java/java/lib/t
> ools.jar:/opt/tomcat/tomcat4.1/bin/bootstrap.jar -Dcatalina.base=/www/web//www.d
> lese.org/tomcat -Dcatalina.home=/opt/tomcat/tomcat4.1 -Djava.io.tmpdir=/www/web/
> /www.dlese.org/tomcat/temp org.apache.catalina.startup.Bootstrap -config /www/we
> b//www.dlese.org/tomcat/conf/dds.xml start
>
> --
> Peter Burkholder, System Administrator
> Digital Library for Earth System Education (DLESE® -- http://www.dlese.org)
> peterb@(protected)
> DLESE Program Center (DPC)                     ~~~ ~~ ~~~~  __o
> UCAR/DPC, P.O. Box 3000     Ph) +1-303-497-2663    ~~~ ~~~~ ~~   _`\<,_
> Boulder, CO 80307-3000     Fx) +1 303-497-8336 ~~~~ ~~~  ~~~~   (*)/ (*)
>
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