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

[Justin Bronder <jsbronder@gentoo.org>]

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On 09/02/08 22:56 -0800, Donnie Berkholz wrote:
...
> > 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) ?
>

Yup, it's actually grabbed during the addition of the implementation to
eselect-mpi.

> > 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.
> 
That's the general idea, however it's not as simple as just setting *into
unless I mess with $D first.  The plan being to have something like mpi_doX
which would handle setting the correct install path and restore global
variables (like $D) on exit.  Not sure if this is the best method, comments
appreciated :)

> > 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.
> 

Not yet, it's being hosted off my home machine which doesn't always have the
best connection.  If a consensus can be reached that this is a worthy
solution, I presume I can talk to the overlay/infra guys then, or maybe even
the sci team who already has an overlay with some MPI applications in it.


Thanks,

-- 
Justin Bronder

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