Re: [gentoo-cluster] Installing and using multiple MPI implementations at the same time.

[Donnie Berkholz <dberkholz@gentoo.org>]

On 22:19 Thu 07 Feb     , Justin Bronder wrote:
> Well bug 44132 [1] has been a real thorn in my side for some time.  The
> problem being that all mpi implementations currently in portage block each
> other.  This is a real pain for any serious administrators, makes testing
> new/other implementations too time-consuming, and in my opinion has probably
> slowed any progress related to getting cluster applications into portage or
> the overlays.
> 
> All that being said, I set out to do something about it.  Donnie Berkholz was
> nice enough to help me out early on and ended up suggesting that I look
> at crossdev.  I shamelessly ripped off the aforementioned script and tuned
> it for mpi implementations and packages.  It should be noted that all the
> changes I've implemented do [should, hopefully will] not effect the way the
> packages behave now, rather it just adds another option.  The idea is as
> follows.

Cool, thanks for doing this much-needed work! I'm happy to hear this 
approach worked. If there really is much common code, it might be worth 
breaking it out into a library of some sort.

> sys-cluster/empi:  Does the same stuff that crossdev does.  You create a new
> implementation root by specifying a name and mpi implementation package to
> build it with. [2]  Empi adds these to an overlay under a new category with
> the name you gave.  The ebuilds inherit mpi.eclass which handles pushing all
> the files to /usr/lib/mpi/<name>, and providing files for eselect-mpi.

lib == $(get_libdir) ?

> A couple of final words, hpl and mpi-examples currently wouldn't work without
> empi, mainly because I'm lazy :)  Also I still haven't figured out a good way
> to handle do{man,doc,www} etcetera, ideas are welcome. 

Do the same thing as gcc. Install to a path under 
/usr/libdir/mpi/..../{man,doc} and use environment variables (MANPATH 
etc) and/or symlinks.

> There's still a fair amount of work to be done, but I wanted to see if 
> anyone had any feedback regarding the general concept first before 
> pushing on.
> 
> You can pull the overlay from rsync://cold-front.ath.cx/mpi (for now...)

Is this in layman? The file's at 
gentoo/xml/htdocs/proj/en/overlays/layman-global.txt.

Thanks,
Donnie
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