[Users] GPU support for the Einstein Toolkit

[Bruno Giacomazzo]

Erik,
  thanks a lot for the information and for the work you are doing. I will
contact CINECA and ask about AMReX support.

Cheers,
Bruno


Il giorno ven 10 lug 2020 alle ore 17:53 Erik Schnetter <
schnetter at cct.lsu.edu> ha scritto:

> Bruno
>
> We are looking into GPU support in the context of the CarpetX project.
> CarpetX <https://bitbucket.org/eschnett/cactusamrex/src/master/> is a
> new driver, currently being developed, that uses AMReX
> <https://amrex-codes.github.io/amrex/> as back-end to provide the
> lower-level AMR capabilities. AMReX supports GPUs, and we intend to
> ensure that CarpetX (and thus the Einstein Toolkit) supports GPUs from
> the beginning. I am (personally) currently not using the larger EU HPC
> systems, but we have Summit <https://www.olcf.ornl.gov/summit/> in the
> North American region, and Summit requires highly efficient GPU codes
> as well.
>
> Having said this, CarpetX is still in the very early stages, so I can
> only present a plan and not yet a solution. We know that AMReX
> supports GPUs, and AMReX is funded and actively developed, so we have
> a very well engineered foundation, but exactly how to expose this to
> Cactus and the Einstein Toolkit isn't quite clear yet. My hope
> (dream?) is that it will be possible to write somewhat generic C++
> code that will run unchanged on both CPUs and GPUs, and that making
> this work efficiently will work without having to maintain two
> different codes. Whether this is possible will remain to be seen.
> Maybe we need to go towards automated code generation (generating both
> CPU and GPU codes from the same script) to make this happen.
>
> I don't see AMReX on the list of supported software for Marconi. Do
> you want to investigate? I wonder whether this is due to lack of
> interest from users, or whether they looked into AMReX and there was a
> roadblock. (I would not assume so, but you never know.)
>
> -erik
>
> On Fri, Jul 10, 2020 at 11:11 AM Bruno Giacomazzo
> <bruno.giacomazzo at unimib.it> wrote:
> >
> > Dear All,
> >   I would like to know if there is any plan to port the Einstein Toolkit
> to GPUs. This is something that we may also discuss at the next Einstein
> Toolkit workshop if there is time.
> >
> >   The reason I'm asking is that in Italy, CINECA (part of the EU HPC
> consortium) just bought its new HPC cluster and it is completely GPU based
> (Marconi100, https://www.hpc.cineca.it/hardware/marconi100, currently
> ranked in the top 10 of the fastest supercomputers in the world).
> >
> >    Speaking with people at CINECA, I was informed that HPC-Europe is
> moving to GPU and, while cpu codes will be still supported for the next 5
> years (with some of the new clusters still having a limited number of nodes
> for cpu codes), the plan is to move to 100% GPU clusters at the EU level. I
> was indeed told that the latest 3 HPC clusters bought by HPC-Europe are GPU
> clusters. The next Italian HPC machine will also be a GPU cluster, with a
> limited number of cpu nodes (they estimate ~3500 nodes with GPUs and ~1000
> nodes with cpus).
> >
> > Thanks,
> > Bruno
> >
> > --
> >
> > Prof. Bruno Giacomazzo
> > Department of Physics
> > University of Milano-Bicocca
> > Piazza della Scienza 3
> > 20126 Milano
> > Italy
> >
> > email: bruno.giacomazzo at unimib.it
> > phone: (+39) 02 6448 2321
> > web: http://www.brunogiacomazzo.org
> >
> > ----------------------------------------------------------------------
> > There are only 10 types of people in the world:
> > Those who understand binary, and those who don't
> > ----------------------------------------------------------------------
> >
> > _______________________________________________
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> > Users at einsteintoolkit.org
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>
>
>
> --
> Erik Schnetter <schnetter at cct.lsu.edu>
> http://www.perimeterinstitute.ca/personal/eschnetter/
>


-- 

Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
Piazza della Scienza 3
20126 Milano
Italy

email: bruno.giacomazzo at unimib.it
phone: (+39) 02 6448 2321
web: http://www.brunogiacomazzo.org

----------------------------------------------------------------------
There are only 10 types of people in the world:
Those who understand binary, and those who don't
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