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From: Caird, Andrew J (acaird_at_[hidden])
Date: 2006-09-28 15:11:33


If you're careful with $PATH and $LD_LIBRARY_PATH you can certainly do
this. One thing that makes this a little easier is the 'modules'
package ( We use this to maintain 9
versions of OpenMPI for various reasons, along with 5 versions of LAM
and a version of MPICH. It does a nice job of keeping everything
separate and our uses have grasped it pretty quickly.

Good luck.

> -----Original Message-----
> From: users-bounces_at_[hidden]
> [mailto:users-bounces_at_[hidden]] On Behalf Of Glenn Johnson
> Sent: Thursday, September 28, 2006 3:04 PM
> To: users_at_[hidden]
> Subject: [OMPI users] using both 64 and 32 bit mpi
> I have an 8-way AMD64 system. I built a 64 bit open-mpi-1.1
> implementation and then compiled software to use it. That all
> works fine.
> In addition, I have a 32 bit binary program (Schrodinger
> Jaguar) that I would like to run on this machine with mpi.
> Schrodinger provides source code to build an mpi
> compatibility layer. This compatibility layer allows jaguar
> to use a different mpi implementation than that which the
> software was compiled with. I do not want to give up the 64
> bit open-mpi that I already have and am using.
> So my questions are:
> 1. Can I build/install a 32 bit version of open-mpi even though I
> already have a 64 bit version installed?
> 2. What "tricks" might I need to do to make sure a program calls
> the correct version of mpi (32 or 64 bit)?
> 3. Would I do better considering running jaguar in a 32
> bit chroot
> environment?
> Thanks.
> --
> Glenn Johnson <gjohnson_at_[hidden]> USDA, ARS, SRRC
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