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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

native2ascii

native2ascii(1) 					      General Commands Manual						   native2ascii(1)

NAME

       native2ascii - native to ASCII converter

SYNOPSIS

       native2ascii [ options ]
	    [ inputfile [outputfile]]

DESCRIPTION

       The  Java  compiler  and  other	Java  tools  can  only process files that contain Latin-1 or Unicode-encoded (udddd notation) characters.
       native2ascii converts files that contain other character encoding into files containing Latin-1 or Unicode-encoded charaters.

       If outputfile is omitted, standard output is used for output.  In addition, if inputfile is omitted, standard input is used for input.

OPTIONS

       The following options are supported:

       -encoding encoding_name
	    Specifies the encoding name that is used by the conversion procedure.  The default encoding is taken from system property  file.encod-
	    ing.   The encoding_name string must be one taken from the first column of the table of supported encodings in the Supported Encodings
	    document:

	    http://java.sun.com/j2se/1.5/docs/guide/intl/encoding.doc.html

       -reverse
	    Performs the reverse operation: converts a file with Latin-1 or Unicode-encoded characters to one with native-encoded characters.

       -Joption       Pass option to the Java virtual machine, where option is one of the options described on the man page for the java  applica-
		      tion  launcher, java(1). For example, -J-Xms48m sets the startup memory to 48 megabytes. It is a common convention for -J to
		      pass options to the underlying virtual machine.

								    22 Jun 2004 						   native2ascii(1)