[Beowulf] mem consumption strategy for HPC apps?
wrankin at ee.duke.edu
Fri Apr 15 16:32:10 EDT 2005
Mark Hahn wrote:
>>Knowing this we could say that HPC applications generally want to eat
>>all available memory but not more. All available memory here means all
> I don't believe this is a useful generalization. applications have a
> "natural" size. applications which are blindly scaled up in data
> (without corresponding scaling of NCPUS) are highly suspect, IMO.
In general I see your point (and to some extent agree with it) but there
are always some exceptions. Some algorithms (multipole N-body for
instance) have tunable parameters that allow you to trade off things
like accuracy for memory footprint. This in turn affects other
computational aspects of the process, ad nauseum. Understanding how
these tradeoffs interact and can impact the overall performance can be
quite a challenge and often beyond the abilities of many users, but they
exist none the less.
More memory may also allow you to run on fewer processors which may well
enable you to operate within a "sweet spot" on the scalability chart for
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