Re: [petsc-dev] PETSc and threads

[Mark Adams]

>
>
> >
> > No, they have very small grids but lots of parallelism because most of
> the data is in particles.  like 10K particles per cell.  So we just need to
> run on the CPU.
>
>   Huhh? I don't think one can just run on the CPU's of this machine. You
> are throwing away 90+ percent of the machine! Did someone in authority tell
> you it is fine to just use the CPUs in this machine? Hell, I need to talk
> to them :-)
>
>
No this is me.  They will probably have about 30K (2D linear FE) equations
per 40 Tflop node.  10% (4 Tflops) is too much resources for 30K equations
as it is.  No need to try utilize the GPU as far as I can see.