[Beowulf] 8GB memeory limit?

[Mark Hahn]

> # gcc -m64 int_malloc.c

try -mcmodel=medium.

basically, mcmodel defaults to small in most cases, which means 
32b data relocations.  medium bumps single-object addressability
up to 64b.  neither of these affect the basic addressing model
(int=32b, long=64b, pointer=64).

> This is with a 2.6.5 kernel (SLES 9).

not a kernel issue, but rather the width of address calculations 
for a single addressable object (as decided by the compiler.)
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