[QE-developers] SX-Aurora TSUBASA

[Tobias Klöffel]

Dear all,

just to share my limited experience with TSUBASA (please correct me if 
its wrong):

You can use it with any standard C/C++/Fortran MPI/OpenMP code, the code 
runs completely on the card. There is some work for back loading onto 
the host CPU and also some work on using the card in a offload fashion, 
but I have no clue about the status of these projects. If I remember 
correctly those projects are C/C++ LLVM only.
Vectorizable code naturally performs exceptionally good, however, 
unvectorizable code is only performed via an ARM core and you will for 
sure find some routines that are extremely slow and more or less 
irrelevant on standard CPUs.

NEC provides BLAS/FFTW/Lapack/SCALapack, compiling CPMD was possible out 
of the box. My biggest issue was indeed the support of OpenMP 
parallelization in those libraries as well as support for nested OpenMP 
in general.

However, I am looking forward to see the code changes done by NEC, and 
of course, the performance.

Best,
Tobias

On 5/28/20 3:21 PM, IWATA NAOKI(岩田 直樹) wrote:
>
> Dear Ye and Paolo,
>
> Thank you very much for your quick response and your interest in 
> SX-Aurora TSUBASA.
>
> I will answer your questions and will provide the code to you later.
>
> At  this moment, please look at the following site:
>
> https://www.hpc.nec/index.en
>
> Best Regards,
>
> Naoki Iwata.
>
> *From:*Ye Luo <xw111luoye at gmail.com>
> *Sent:* Thursday, May 28, 2020 1:09 AM
> *To:* General discussion list for Quantum ESPRESSO developers 
> <developers at lists.quantum-espresso.org>
> *Cc:* IWATA NAOKI(岩田　直樹) <n-iwata-da at nec.com>
> *Subject:* ##freemail## Re: [QE-developers] SX-Aurora TSUBASA
>
> Hi Naoki,
>
> Could you put the code on gitlab or github for us to preview?
>
> Could you say a bit more how did you "port"? Which part of QE was 
> ported? How did you port?
>
> NEC aurora is an accelerator but it is not a GPU. How did you program it?
>
> I was aware of FFT libraries for SX-Aurora. Did you use SX-Aurora via 
> library?
>
> The code path to SX in FFTXLIB is not maintained for a long time I 
> guess. Perhaps it is time to clean/refactor that part.
>
> Regarding compiler options, do you have a customized compiler? Or it 
> is gfortran or flang and you just need to just pass some -D flags?
>
> Best,
>
> Ye
>
> ===================
> Ye Luo, Ph.D.
> Computational Science Division & Leadership Computing Facility
> Argonne National Laboratory
>
> On Wed, May 27, 2020 at 10:15 AM IWATA NAOKI(岩田　直樹) 
> <n-iwata-da at nec.com <mailto:n-iwata-da at nec.com>> wrote:
>
>     Dear developers,
>
>     My name Naoki Iwata from NEC Corporation in Japan.
>     We are developing and selling a newer vector-supercomputer,
>     SX-Aurora TSUBASA.
>     https://www.nec.com/en/global/solutions/hpc/
>
>     We have ported and optimized QUANTAM ESPRESSO v6.3 for SX-Aurora
>     TSUBASA.
>     So we would like to ask you to implement our compile options and
>     source code changes
>     for the optimization for SX-Aurora TSUBASA into the original
>     QUANTUM ESPRESSO
>     makefile and source code.
>     I looked at the users' guide, I found the description of SX-6 and
>     SX-8. They are old system.
>     So we also would like to update it to SX-Aurora TSUBASA.
>     What should we do for that?
>
>     Best Regards,
>
>     Naoki Iwata
>     -----
>     Naoki Iwata (n-iwata-da at nec.com <mailto:n-iwata-da at nec.com>)
>     NEC AI Platform Division
>
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-- 
M.Sc. Tobias Klöffel
=======================================================
HPC (High Performance Computing) group
Erlangen Regional Computing Center(RRZE)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Martensstr. 1
91058 Erlangen

Room: 1.133
Phone: +49 (0) 9131 / 85 - 20101

=======================================================

E-mail: tobias.kloeffel at fau.de

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