differences between java -s Vs java -X when the JVM is running

[Software]

Hi i'm using tomcat 4103, when i'm typing this command ps -ef | grep 
java    i got many theses lines

/usr/java/j2sdk1.4.0/bin/java -s

What does this line mean and what is the difference between this line 
and  this /usr/java/j2sdk1.4.0/bin/java -X

This line affect the performance on the server

Thnaks for you help

fabian



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