[Users] compilation on marenostrum 4

[hwitek]

Hi Miguel, everyone,

regarding your first point: I had a similar problem on its predecessor, 
MareNostrum 3.
The trick was to unset the global MPI variable, so in my bashrc I had 
something like

module load intel
...
unset MPI

I hope this helps! I'll also have a go at the compilation myself 
tonight.

cheers,
Helvi


On 2017-10-18 18:52, Miguel Zilhão wrote:
> hi all,
> 
> i've been compiling the latest ET on marenostrum 4, and there were a
> couple of issues i'd like to ask:
> 
> 1. on marenostrum, they bundle a lot of mpi-related tools on modules.
> in particular, one of the
> default modules that is loaded is called 'impi'. this module sets the
> global variable $MPI to 'impi', ie
> 
>   $ echo $MPI
>     impi
> 
> this seems to severely interfere with the Cactus building process. at
> the configuration stage i get
> the following:
> 
> Configuring with flesh MPI
>    Warning: use of flesh MPI via MPI option is deprecated and should
> be replaced with the thorn
> ExternalLibraries/MPI and its MPI_DIR option
>    MPI selected, but no known MPI method - what is "impi" ?
> 
> to workaround this problem, i've unloaded the module (module unload
> impi), which undefines the $MPI
> variable. after this, the configuration stage works fine.
> this seems to me like a bug, though. after all, a cluster-wide global
> variable called $MPI seems
> like a natural thing to exist in a lot of these machines... should
> the building of Cactus rely on
> the non-existence of such a variable?
> 
> the other inconvenient thing is that, by unloading the impi module,
> one also removes from $PATH the
> mpirun command. so one has to unload the module for compiling the
> code, and then load it back to be
> able to run it.
> 
> 2. i was not able to compile with any of the provided intel compilers
> (with gcc it worked fine). i
> know there are known issues with some versions of the intel
> compilers; is there some sort of list of
> intel compilers that are known to work? i could maybe try to ask the
> technical support if they could
> make those specific versions available...
> 
> thanks,
> Miguel
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-- 
===========================
Dr. Helvi Witek
Marie-Curie Research Fellow
Dep. Fisica Quantica i Astrofisica
Universitat de Barcelona
===========================