Largest mallocs opteron vs. 32bit systems

[Soeren Sonnenburg]

Hello...

I just did some tests trying to malloc() memory on an opteron and a xeon
system...

I wonder why I see regression for the opteron in 32bit mode. Comments
welcome (workarounds even more). Anyhow my observations:

malloc large block:

opteron -> up to 7G (64bit exe) -> up to 1500M (32bit exe)
xeon -> up to 2000M

malloc a couple of blocks of size 100M:

whole process (100 M steps)
opteron -> 7700M (64bit exe) -> up to 2200 (32bit exe)
xeon -> 2700M

So one 'looses' 500M.

Feedback welcome,
Soeren

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