[petsc-users] Memory requirements in SUPERLU_DIST

[Jed Brown]

Zin Lin <zinlin.zinlin at gmail.com> writes:
> What I don't understand is  why memory per core matters rather than the
> total memory? If the work space is distributed across the processors,
> shouldn't it work as long as I choose a sufficient number of smaller-memory
> cores? 

METIS is a serial partitioner.  ParMETIS is parallel, but often performs
worse and still doesn't scale to very large numbers of cores, so it is
not the default for most direct solver packages.

> What kind of role does the memory per core play in the algorithm in
> contrast to the total memory over all the cores?
>
> The issue is I would rather use a large number of small-memory cores than
> any number of the large-memory cores. The latter are two times more
> expensive in terms of service units (I am running on STAMPEDE at TACC) and
> not many cores are available either.

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