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List:       beowulf
Subject:    Re: [Beowulf] 8GB memeory limit?
From:       Mark Hahn <hahn () mcmaster ! ca>
Date:       2007-07-11 12:37:34
Message-ID: Pine.LNX.4.64.0707110828260.13780 () coffee ! psychology ! mcmaster ! ca
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> > try -mcmodel=medium.
> 
> ... which doesn't affect malloc() at all. It only affects static data.

oops, duh!  failure of attention.
I'd have to guess the issue is a ulimit.  malloc is mapped (for large
allocations) to an anonymous mmap normally.  it might be interesting to 
strace the config that fails, to verify this.  there's also the kernel's
overcommit setting (/proc/sys/vm/overcommit_*) which could cause this effect.

-mark
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