[petsc-users] mixed precision

[Matthew Knepley]

On Mon, Aug 12, 2013 at 12:24 PM, Jim Fonseca <jefonseca at gmail.com> wrote:

> Hi,
> We are curious about the mixed-precision capabilities in NEMO5. I see that
> there is a newish configure option to allow single precision for linear
> solve. Other than that, I found this old post:
> https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2012-August/014842.html
>
> Is there any other information about to see if we can take advantage of
> this capability?
>

Mixed-precision is hard, and especially hard in PETSc because the C type
system is limited.
However, it also needs to be embedded in an algorithm that can take
advantage of it. I would
always start out with a clear motivation:

  - What would mixed precision accomplish in your code?

  - What is the most possible benefit you would see?

and decide if that is worth a large time investment.


> Thanks,
> Jim
>
> --
> Jim Fonseca, PhD
> Research Scientist
> Network for Computational Nanotechnology
> Purdue University
> 765-496-6495
> www.jimfonseca.com
>
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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