[petsc-users] How to use Intel OneApi mpi wrappers on Linux

[Mark Adams]

Hi Paolo,

You can use things like this in your configure file to set compilers and
options.

And you want to send us your configure.log file if it fails.

Mark

    '--with-cc=gcc-11',
    '--with-cxx=g++-11',
    '--with-fc=gfortran-11',
    'CFLAGS=-g',
    'CXXFLAGS=-g',
    'COPTFLAGS=-O0',
    'CXXOPTFLAGS=-O0',


On Mon, Oct 3, 2022 at 5:43 AM Paolo Lampitella <paololampitella at hotmail.com>
wrote:

> Dear PETSc users and developers,
>
>
>
> as per the title, I recently installed the base and HPC Intel OneApi
> toolkits on a machine running Ubuntu 20.04.
>
>
>
> As you probably know, OneApi comes with the classical compilers (icc,
> icpc, ifort) and relative mpi wrappers (mpiicc, mpiicpc, mpiifort) as well
> as with the new LLVM based compilers (icx, icpx, ifx).
>
>
>
> My experience so far with PETSc on Linux has been without troubles using
> both gcc compilers and either Mpich or OpenMPI and Intel classical
> compilers and MPI.
>
>
>
> However, I have now troubles using the MPI wrappers of the new LLVM
> compilers as, in fact, there aren’t dedicated mpi wrappers for them.
> Instead, they can be used with certain flags for the classical wrappers:
>
>
>
> mpiicc -cc=icx
>
> mpiicpc -cxx=icpx
>
> mpiifort -fc=ifx
>
>
>
> The problem I have is that I have no idea how to pass them correctly to
> the configure and whatever comes after that.
>
>
>
> Admittedly, I am just starting to use the new compilers, so I have no clue
> how I would use them in other projects as well.
>
>
>
> I started with an alias in my .bash_aliases (which works for simple
> compilation tests from command line) but doesn’t with configure.
>
>
>
> I also tried adding the flags to the COPTFLAGS, CXXOPTFLAGS and FOPTFLAGS
> but didn’t work as well.
>
>
>
> Do you have any experience with the new Intel compilers and, in case,
> could you share hot to properly use them with MPI?
>
>
>
> Thanks
>
>
>
> Paolo
>
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