[petsc-dev] Multiple MPICH/fblaslapack Installs For Multiple Arches

[Satish Balay]

Do you mean 32-bit/64-bit (pointers) or --with-64-bit-indices=0/1 ? [or do you have --known-64-bit-blas-indices in the mix?]

Satish

On Sun, 22 Mar 2020, Jacob Faibussowitsch wrote:

> Hello all,
> 
> As part of development, I have several arch folders lying around in my PETSC_DIR namely a 32-bit OSX, 64-bit OSX, 32-bit linux with valgrind, 64-bit linux with valgrind, and a 32-bit up to date with current master. All of these have a —download-mpich —download-fblaslapack and hence their own copy of each (so that’s 5 copies of each, plus other duplicated packages im sure). At this stage, even getting the bare minimum of these arches ready for dev work after a rebase/git pull takes decades as package versions, or conf settings change, forcing a rebuild of the same packages multiple times.
> 
> My question(s):
> What petsc ./configure options are necessary to change the configuration of each library w.r.t. petsc? i.e. can my 64-bit arches use my 32-bit MPICH/fblaslapack and vice-versa? Does this change when I have —with-debug on or off? If so, what other packages have a similar ability? Is there anywhere in ./configure —help where this kind of information would be documented? 
> 
> I suspect that this hasn’t been fully explored since its primarily a developer “problem” and not one the average user will run into/care about (since they usually aren’t building petsc multiple times). I’m sure everyone has their own ways of tackling this problem, I’d love to hear them.
> 
> Best regards,
> 
> Jacob Faibussowitsch
> (Jacob Fai - booss - oh - vitch)
> Cell: (312) 694-3391
> 
>