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From Justin Bertram <jbert...@apache.org>
Subject Re: Apache Artemis - Stress-test time
Date Thu, 06 Apr 2017 16:14:03 GMT
My advice is to simplify your environment, application, and broker configuration as much as
possible while still reproducing the high CPU utilization.  If you can do it with only local
resources (e.g. everything running on a laptop) then that's even better.  The simpler and
easier it is to reproduce the faster (and more accurately) the problem can be analyzed and
resolved.

After simplifying, the first thing would be to determine if the high CPU is being caused by
garbage collection or something else.  You can monitor heap utilization with tools like JConsole
and VisualVM.  Timely thread dumps are a great way to see what's consuming CPU within the
broker itself.

Good luck.


Justin

----- Original Message -----
From: "francesco81" <Francesco.PADOVANI@bticino.it>
To: users@activemq.apache.org
Sent: Thursday, April 6, 2017 10:08:03 AM
Subject: Re: Apache Artemis - Stress-test time

Hi Justin,
we've tried by turning off tls. It doesn't change: cpu usage remain very
high.
We've tried also by disabling persistence. It changes a bit: at the
beginning of the connection phase, cpu goes to 50% ...then it increases time
by time til it reaches 100% when there are about 1000 connected clients.
Now we're going to add some logs to our scecurity plugin, to see the cpu
consumption for every involved thread.
Meanwhile I'm going to install and use Sun Oracle JDK 8, instead of the
current OpenJDK 8, but simply to have jmap, jstack and jcmd utilities to
make some additional analysis (I can't find them inside the standard OpenJDK
package for Centos7).

I'll let you know for further results.
Of course, any suggestion to make a better performance analysis is
appreciated.

Thanks a lot.

Francesco



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