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

Barry Smith bsmith at mcs.anl.gov
Wed Feb 5 14:36:29 CST 2014

On Feb 5, 2014, at 2:05 PM, Jed Brown <jed at jedbrown.org> wrote:

> 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.  

   But what about a non-HPC machine? Not everyone has huge machines but how about a well-endowed server quality workstation setup with the best disks available? Put as much physical memory as possible and then use the disks for out of core.


> 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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