Thank you for all the replies to my post. I've read them all and so far here's what I've gathered / have to do:

* We are using an 8-CPU 64-bit Opteron machine so process size won't be a problem.

* My max mem size, virtual memory, data segment size are all unlimited as I'm root.

* RHEL might be swapping to disk even with a lot of free physical memory.

* Recode my application to do less but larger mallocs (few MBs each?). I have several versions of my malloc application in place, linked list, trees, etc. Ideally I would like to use binary trees inside a hash table for easy lookups.

Carlo

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