[petsc-users] mumps running out of memory, depending on an overall numerical factor?

Jed Brown jed at jedbrown.org
Wed Feb 5 14:05:52 CST 2014

Klaus Zimmermann <klaus.zimmermann at physik.uni-freiburg.de> writes:
> Isn’t that a bit pessimistic? After all there is the out-of-core
> facility with mumps.

I'll just note that out-of-core as an algorithmic device is dead on most
HPC machines.  There are a few machines with fast local SSD, but the
majority of HPC machines need about an hour to write the contents of
memory to disk.  You can get more memory by running on more cores up to
the entire machine.  If that's not enough, current computing awards
(e.g,, INCITE) are not large enough to store to disk at full-machine
scale more than a few times per year.
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