Do I have to restart my machine for ulimit - u to take affect?

Question

So I have an external 3rd party application which runs on Java. The JVM is getting a load of OutOfMemeory errors and their support team suggested I raise the ulimit - u from he default 1024 to 4096

There is a start-up shell script that starts the server. This essentially sets some environment variables and executes the Java. I've added the following line:

ulimit -u 4096

How will I know this has worked? Do I need to start my machine to get this to come into affect?

Answer 1

ulimit only raises the possible file descriptors per application, but you dont seem to have a problem with descriptors but with memory, how do you start this java-based tool?

Anyway for this to work you have to increase your heap allocation space. The parameter -Xms for the java command sets the initial size of the heap. Check the link at the bottom for further details [1] Just increase the size.

Regards

http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/java.html#nonstandard