[openfabrics-ewg] RE: OpenMPI package & install definition

[Jeff Squyres (jsquyres)]

In general, I am too.
 
However, at least in my experience, if there is not a trivial mechanism
for a user to choose which MPI to use (preferably a menu-based
selection, or some simple CLI mechanism), users will mess it up and get
confused when it doesn't work (e.g., set PATH for one MPI but
LD_LIBRARY_PATH for another, and MANPATH for a 3rd).  And then we get
blamed.  :-)
 
I realize that the easy solution here is just to say "document it / let
the user figure it out", but:
 
1. I want to be sure that we all understand and agree to that
2. This does not solve problems for us if we want to have some automated
scripts to compile/run MPI applications (e.g., PMB) -- the automated
scripts will run into the same issues
 
There are a few solutions that may be helpful here, such as environment
modules/switcher or softenv.  It just depends on what we want to do


________________________________

	From: Scott Weitzenkamp (sweitzen) 
	Sent: Tuesday, March 28, 2006 12:23 PM
	To: Jeff Squyres (jsquyres); Tziporet Koren; Pavel Shamis;
Vladimir Sokolovsky; Gleb Natapov; Gil Bloch
	Cc: Openfabrics-ewg at openib.org
	Subject: RE: [openfabrics-ewg] RE: OpenMPI package & install
definition
	
	
	About multiple MPIs, I don't see a problem with installing them
in different directories and using PATH to pick which one to use.
	 
	Scott


________________________________

		From: openfabrics-ewg-bounces at openib.org
[mailto:openfabrics-ewg-bounces at openib.org] On Behalf Of Jeff Squyres
(jsquyres)
		Sent: Tuesday, March 28, 2006 6:15 AM
		To: Tziporet Koren; Pavel Shamis; Vladimir Sokolovsky;
Gleb Natapov; Gil Bloch
		Cc: Openfabrics-ewg at openib.org
		Subject: [openfabrics-ewg] RE: OpenMPI package & install
definition
		
		
		9am would work better for me, but I could do 8:30 if
necessary.  Some topics we need to discuss:
		 
		- Distributing software from non-core EWG members (e.g.,
PMB).
		- Making MPI-dependent codes work with multiple MPI
installations (e.g., PMB).  Note that this is orthogonal to which MPI
implementation you are using, since the same MPI can be installed
multiple times (e.g., with different compilers).
		- How to include multiple MPI's and provide a good
mechanism for the sysadmin / end-user to choose between them.
		 

		 

________________________________

			From: Tziporet Koren
[mailto:tziporet at mellanox.co.il] 
			Sent: Tuesday, March 28, 2006 9:14 AM
			To: Jeff Squyres (jsquyres); Pavel Shamis;
Vladimir Sokolovsky; Gleb Natapov; Gil Bloch
			Cc: Openfabrics-ewg at openib.org
			Subject: OpenMPI package & install definition
			
			

			We need to have a meeting of all MPI maintainers
to close definition of OpenMPI package and install.

			It is important to close this definition soon
since we want that RC3 will include OpenMPI package.

			 

			If you are in the "To" section then you need to
attend this meeting. Other people that work on MPI and wish to join are
welcome too.

			 

			We wish to make this meeting tomorrow on 8:30am
or 9am PST (6:30pm or 7pm Israel time).

			 

			Please reply if this time suites you and I will
set a bridge.

			 

			Thanks,

			Tziporet

			 

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