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David,

On 6/30/15 1:10 PM, RAY, DAVID wrote:
> I am running Apache 2.2.29 and Tomcat 7.0.59 with tomcat 
> connector(mod_jk) version 1.2.40 on AIX version 7.1 server.
> 
> Started having problems this morning after AIX OS was patched to
> AIX 7.1 TL 03 SP 04 and openssh to 6.0.0.6108. WebAdvisor runs fine
> immediately after apache is started or restarted. However its
> response slowing down.
> 
> AIX server CPU steadily increases and approaches 100% after running
> for 5 or 10 minutes under heavy load.. Seeing http process
> accumulate. Not seeing much traffic at all in Tomcat server
> status.

Which process is more busy? Apache httpd or Tomcat?

> Recompiled apache, tomcat connector, and Tomcat native. Still no
> luck.
> 
> Later determined there is a bug with openssh 6.0.0.6.108 and tried
> 6.0.0.6109. Recompiled again.

OpenSSH should have no impact on httpd or Tomcat. Do you mean OpenSSL
instead?

> Still no improvement. Just booted from Clone backup taken before
> the AIX patch and everything runs fine, no problems. Anyone else
> have this experience with AIX patches/updates?

I'm fairly sure Rainer uses AIX quite often, and he's one of the
principal maintainers of mod_jk.

> Not really much to see in error logs. Tomcat is configured to run 
> with java6 32 bit:
> 
> IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 AIX ppc-32
> jvmap3260sr16-20141216_227499 (JIT enabled, AOT enabled) J9VM -
> 20141216_227499 JIT  - r9_20140523_64469ifx3 GC   -
> GA24_Java6_SR16_20141216_1020_B227499) JCL  - 20141216_01


Any change of upgrading Java? Java 6 is dead and frankly so is Java 7.
IBM may still support their own JVMs... I'm not in a position to know.
There may be a bug in the Java runtime that is causing problems for
you. At least make sure you are running the absolutely latest version
of Java 6 that you can get from IBM for AIX.

Are you able to at least test with Java 8 to see if there is any
improvement?

- -chris
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