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Java process demoted to single CPU

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Operating Systems Linux Red Hat Java process demoted to single CPU
# 1  
Old 10-08-2013
Linux Java process demoted to single CPU
please help on this issue.

I take care of a production enterprise application , it is a java process quite complex that is a middleware application.
The process runs 24 hours a day. Usage cpu is 60% as mean value all day.
The process have some burst of cpu usage at 100% usage in the afternoon.
The process runs in a WMWARE virtual Server:
the server is configured 2 CPU, 4GB ram;
the server is installed as a Linux Kernel 2.6.18-274.12.1.el5.
Java version installed is 1.6.0_16;
In a unpredictable moment, mean 2 times a week, the processes is misteriously demoted to Single CPU,
so it takes maximum 50% CPU and application becomes unavailable because not capable to serve all requests.
Does anybody knows if there is an "auto demoting to single cpu" mechanism in Java ?
Or in Linux?
Or in Wmware?

thanks in advance
Alberto
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LEARN ABOUT MOJAVE

rmiregistry

rmiregistry(1)						      General Commands Manual						    rmiregistry(1)

NAME

       rmiregistry - Java remote object registry

SYNOPSIS

       rmiregistry [ port ]

DESCRIPTION

       The  rmiregistry command creates and starts a remote object registry on the specified port on the current host.	If port number is omitted,
       the registry is started on port 1099.  The rmiregistry command produces no output and is typically run in the background.  For example:

	      example% rmiregistry &

       A remote object registry is a bootstrap naming service that is used by RMI servers on a host to bind remote objects to names.  Clients  can
       then look up remote objects and make remote method invocations.

       The registry is typically used to locate the first remote object on which an application needs to invoke methods.  That object in turn pro-
       vides application-specific support for finding other objects.

       The methods of the java.rmi.registry.LocateRegistry class are used to get a registry operating on a particular host or host and port.

       The URL-based methods of the java.rmi.Naming class operate on a registry and can be used to look up a remote object, bind a simple (string)
       name to a remote object, rebind a new name to a remote object (overriding the old binding), unbind a remote object, and list the URLs bound
       in the registry.

OPTIONS

       The following option is supported:

       -Joption       Used in conjunction with any java option, this option passes option (no spaces between -J and option) on to the java  inter-
		      preter.

SEE ALSO

       See (or search java.sun.com) for the following:

       java.rmi.Naming @
	    http://java.sun.com/j2se/1.5/docs/api/java/rmi/Naming.html

       java.rmi.registry.LocateRegistry @
	    http://java.sun.com/j2se/1.5/docs/api/java/rmi/registry/LocateRegistry.html

								    23 Apr 2001 						    rmiregistry(1)