RE: How To Limit Tomcat CPU on IBM i

Unfortunately that only restricts to one core. One core can still drive a
system to its knees

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Charles Wilt
Sent: Wednesday, April 23, 2014 7:31 AM
To: Java Programming on and around the IBM i
Subject: Re: How To Limit Tomcat CPU on IBM i

Do you have multiple oores?

Are you running 7.1?

If the answer to both is yes, take a look at Workload capping
http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/topic/rzaks/rzaksworkloadca
pping.htm

HTH,
Charles


On Wed, Apr 23, 2014 at 8:09 AM, Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx> wrote:

Paul,

Since this is all running in one partition, about the only way I can
think of is to put a monitor on the system that whenever the Tomcat
jobs spike over a certain percentage of CPU for a specified period of
time, it drops the priority of those jobs to over 50. A CL using some
APIs or Management Central could do that for you.

What OS version?

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:
java400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Holm, Paul
Sent: Tuesday, April 22, 2014 4:50 PM
To: Java 400 List
Subject: How To Limit Tomcat CPU on IBM i

I'm running Tomcat 5.5 directly on the IBM i. Periodically when running
some code the CPU spikes to 99.9%. We suspect it might be some infinite
loops in certain cases and we are analyzing that.

Tomcat is started from a CL command which calls the catalina400.sh

How can I LIMIT the amount of CPU that Tomcat is allowed so it doesn't
degrade performance for the other system users?

Thanks, Paul Holm
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