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very Large memory java jobs

We have several bio-computing experiments that need over 
2GB of heap.  We are running on linux-2.4.19 on machines
with 4GB of memory.

$ java -version
java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build
Java HotSpot(TM) Client VM (build Blackdown-1.3.1-FCS, mixed mode)

Allocating 1.9GB appears to work (will crash sometime though).

$ java -Xmx1900m J

Allocating 2GB and above always fails.

$java -Xmx2000m J
Error occurred during initialization of VM
Could not reserve enough space for object heap

Can anybody suggest a solution or work around.


Kristian G. Kvilekval
email:kris@cs.ucsb.edu office:(805)893-4178 http://www.cs.ucsb.edu/~kris

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