Semi OT: cpu always 100%

[Jose R R]

On Thu, May 21, 2009 at 11:55 PM, ESGLinux <esggrupos at gmail.com> wrote:
>
> Hello,
>
> I have marked this question as Semi OFF Topic because I think its not Red
> Hat specific issue but a related product.
>
> I use tomcat on a  Red Hat Enterprise Linux AS release 4 (Nahant Update 4).
> What happens to me is that suddenly the process of tomcat gets 100% CPU and
> stays at that level of usage for ever. I suspect there is a problem with my
> application (I´m not asking about this, that´s my problem :-( )
>
Have you tried an different JVM / JDK?  Are these latter 64- or 32-bit
?  Is your application / server designed to run in 32- or 64-bit arch?
 Have your tried running your application in an different server
(hardware)?  What about trying the application within an different
GNU/Linux distribution environment?

Hardware and software heterogeneous environments provide insight that
you would not obtain from an homogeneous one.  Hence, if possible
explore running your application/tomcat server in an alternate
environment.  Moreover...

Java Performance analysis tools available for Red Hat's JBoss
application server may come handy --especially since tomcat is only a
component of JBoss.  Since you mentioned (elsewhere) you have a paid
Red Hat subscription, you may have access to some or all of those.

>
> What I want to know is, how can I see, for example, the thread of tomcat is
> consumming the cpu (I have tried the thead options of ps) and if is there
> any way to inspect what is doing a thread.
>
Additionally, the IBM AlphaWorks / DeveloperWorks area offers early
access (development releases) to sophisticated Java Performance
analysis tools (among other cool stuff) that you may find of great
value in your efforts to diagnose your Java application/server.  See
for instance < http://www.alphaworks.ibm.com/tech/jca >.  Yes, you
will also find debuggers and heap analyzers to correct your Java
application ;-)

As a matter of fact you may even find helpful application diagnose
tools and utilities  (at little, no cost, or trials)  from any Java
software development entity like Sun MicroSystems and, of course, its
rabid Java user parent company.
[...]

Good luck!

--
Jose R R
http://www.metztli-it.com
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