[Pw_forum] compiling for Intel Xeon Phi

[Евгений Пермяков]

It wasn't that simple (since I stumbled upon numerous complains about
incompatible format), so I had to manually set up all compilers to use
intel compilers. But OK.


Another concern is if pw.x can benefit from setup. Specifically
- can QE perform dynamic load balancing and utilize heterogeneous nodes
efficiently?
- can QU utilize phi cores efficiently (i.e. if pure native execution
 would be more efficient than offload or pure CPU modes)?

On 24 March 2015 at 18:19, Fabio Affinito <f.affinito at cineca.it> wrote:

> Hi,
>
> You can take advantage of the offload mode using the libxphi library. This
> library offloads the BLAS/MKL functions on the Xeon Phi platform hiding the
> latency times due to the communication. You just need to compile this
> library and then to link it dynamically. The library works with any version
> of QE.
> Libxphi library is available from https://github.com/cdahnken/libxphi
> Some documentation is available therein.
>
> Instead, if you want to compile a native version of pw, you just need to
> add the -mmic flag and cross compile.
> If you want to use the symmetric mode, you need to compile twice: with and
> without the -mmic flag.
>
> Best,
>
> Fabio
>
>
>
> ----- Messaggio originale -----
> > Da: "Евгений Пермяков" <permeakra at gmail.com>
> > A: "PWSCF Forum" <Pw_forum at pwscf.org>
> > Inviato: Martedì, 24 marzo 2015 15:54:58
> > Oggetto: [Pw_forum] compiling for Intel Xeon Phi
> >
> >
> >
> > I have access to cluster with Xeon Phi coprocessor on nodes. (it also
> > has Scalapack and mkl) The documentaion mentions several way to
> > compile programs:
> > 1) offload mode, executed on main CPU and offloaded onto coprocessor
> > "automagically" (compiled with "mpicc" (I assume, in case of fortran
> > applications it is "mpif90")
> > 2) native mode, executed completely on coprocessor, compiled with
> > "mpicc -mmic" ("mpif90 -mmic"
> >
> > 3) symmetric mode, requiring creation of both binaries
> >
> >
> > Questions: does pw.x benefit from any of the modes? How should I
> > create 'native' binaries ? Is it possible to produce both "mmic" and
> > "normal" binaries in same tree or I have to compile to source trees
> > separately ?
> > _______________________________________________
> > Pw_forum mailing list
> > Pw_forum at pwscf.org
> > http://pwscf.org/mailman/listinfo/pw_forum
>
> --
> "When you are solving a problem, don’t worry. Now, after you have solved
> the problem, then that’s the time to worry." Richard Feynman
>
> Fabio Affinito, PhD
> SuperComputing Applications and Innovation Department
> CINECA - via Magnanelli, 6/3, 40033 Casalecchio di Reno (Bologna) - ITALY
> Tel: +39 051 6171794  Fax: +39 051 6132198
>
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