[Beowulf] Controlling java's hunger for RAM

Mark Hahn hahn at mcmaster.ca
Mon Feb 20 21:02:39 PST 2012


> The reason why is that Torque sets RLIMIT_RSS to enforce memory

RLIMIT_RSS is simply a noop; we use RLIMIT_AS (vmem, pvmem).
a good thing about this is that it's fully consistent with 
the vm.overcommit_memory=2 (ie conservative) mode.  some people 
find it offputting the way VM counts things like code (usually
mapped multiple times) or F77 arrays that are defined larger than used.

regards, mark hahn.


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