[petsc-users] problem configuring 3.8.3 with intel mpi

[Satish Balay]

Sure - they have so many ways of tweaking things - so one can't things
will be the same across multiple users.

Most users dont' set these env variables [thats extra work - and not
the default behavior anyway] - so they rely on the default behavior -
i.e use mpicc for gnu and mpiicc for intel compilers.

[i.e the guesses picked up by configure might not always be what the
user wants - so its best to tell configure not to guess - and tell it
exactly what one wants it to use. And there might be scope to improve
guessing in favor of most common use cases.]

Satish

On Thu, 22 Mar 2018, Klaij, Christiaan wrote:

> Fair enough.
> 
> As a side note: if you want intel compilers, there's no need to
> specify mpiicc, intel says to export I_MPI_CC=icc, which gives
> 
> $ which mpicc
> /opt/intel/compilers_and_libraries_2017.1.132/linux/mpi/intel64/bin/mpicc
> $ mpicc -v
> mpiicc for the Intel(R) MPI Library 2017 Update 1 for Linux*
> Copyright(C) 2003-2016, Intel Corporation.  All rights reserved.
> icc version 17.0.1 (gcc version 4.8.5 compatibility)
> 
> (otherwise they wrap the gnu compilers by default, baffling)
> 
> Chris
> 
> 
> dr. ir. Christiaan Klaij  | Senior Researcher | Research & Development
> MARIN | T +31 317 49 33 44 | mailto:C.Klaij at marin.nl | http://www.marin.nl
> 
> MARIN news: http://www.marin.nl/web/News/News-items/Frequency-of-spill-model-for-area-risk-assessment-of-shipsource-oil-spills-in-Canadian-waters-1.htm
> 
> ________________________________________
> From: Satish Balay <balay at mcs.anl.gov>
> Sent: Thursday, March 22, 2018 2:54 PM
> To: Klaij, Christiaan
> Cc: petsc-users
> Subject: Re: [petsc-users] problem configuring 3.8.3 with intel mpi
> 
> On Thu, 22 Mar 2018, Klaij, Christiaan wrote:
> 
> > OK, configure works with the option --with-cc=/path/to/mpicc,
> > thanks!
> >
> > I'm not sure you are right about checking --with-mpi-dir/bin,
> 
> There are 2 types of options to configure:
>  - tell configure what to use - i.e do not guess [like --with-cc=mpicc']
>  - tell configure to *guess* with partial info [like --with-package-dir=/path/to/foo/bar]
> 
> When configure has to guess - it will never be perfect.
> 
> Sure - perhaps the guessing of --with-mpi-dir can be improved - but it will never be perfect.
> 
> > because, at least with this install, the binaries are located in
> > --with-mpi-dir/intel64/bin:
> >
> > $ which mpicc
> > /opt/intel/compilers_and_libraries_2017.1.132/linux/mpi/intel64/bin/mpicc
> 
> So the more appropriate thing here [wrt petsc configure] is
> --with-mpi-dir=/opt/intel/compilers_and_libraries_2017.1.132/linux/mpi/intel64
> 
> And then - what if you want to use intel compilers and not gnu
> compilers [with intel mpi]? - you have to specify mpiicc - and not
> mpicc - so its best to prefer 'no-guess' options like --with-cc.
> [with-mpi-dir is usually convinent - but not always suitable]
> 
> Satish
> 
> >
> > Perhaps something to do with intel supporting both 32 and
> > 64bit. Anyway, our sysadmin didn't change any of these locations,
> > they just run the intel installer and this is what we got.
>