VPS server RAM question for JAVA

I am new to VPS hosting so my question could be a little stupid, but...

For example, some hosting company offers vps plan with 256mb ram. Can I configure JAVA to use al开发者_Python百科l those 256mbs? Or some memory will be used to by linux?

thank you

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You cannot assign the entire 256 mb to the JVM, the OS will still use a significant portion for its own use.

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Definitely some memory will be used the OS and any other software you may run.

You can control how much memory Java uses by specifying the following VM parameters:

-Xms=64m for initial heap size -Xmx=256m for maximum heap size

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First get Total memory being used by other processes on peak load [without this java process].

This may help you get started http://www.cyberciti.biz/faq/linux-check-memory-usage/

keep some extra buffer , think how much your program/server would require and based on that then decide on howmuch memory you need to dedicate to java.

I suggest refer to JVM tuning articles that relate to target JVM and OS before finalizing stats