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From: Eric Thibodeau (kyron_at_[hidden])
Date: 2006-07-16 18:53:33


Thanks, now all makes more sense to me. I'll try the hard way, multiple builds for multiple envs ;)

Eric

Le dimanche 16 juillet 2006 18:21, Brian Barrett a écrit :
> On Jul 16, 2006, at 4:13 PM, Eric Thibodeau wrote:
> > Now that I have that out of the way, I'd like to know how I am
> > supposed to compile my apps so that they can run on an homogenous
> > network with mpi. Here is an example:
> >
> > kyron_at_headless ~/1_Files/1_ETS/1_Maitrise/MGL810/Devoir2 $ mpicc -L/
> > usr/X/lib -lm -lX11 -O3 mandelbrot-mpi.c -o mandelbrot-mpi
> >
> > kyron_at_headless ~/1_Files/1_ETS/1_Maitrise/MGL810/Devoir2 $ mpirun --
> > hostfile hostlist -np 3 ~/1_Files/1_ETS/1_Maitrise/MGL810/Devoir2/
> > mandelbrot-mpi
> >
> > ----------------------------------------------------------------------
> > ----
> >
> > Could not execute the executable "/home/kyron/1_Files/1_ETS/
> > 1_Maitrise/MGL810/Devoir2/mandelbrot-mpi": Exec format error
> >
> >
> > This could mean that your PATH or executable name is wrong, or that
> > you do not
> >
> > have the necessary permissions. Please ensure that the executable
> > is able to be
> >
> > found and executed.
> >
> > ----------------------------------------------------------------------
> > ----
> >
> > As can be seen with the uname -a that was run previously, I have 2
> > "local nodes" on the x86_64 and two i686 nodes. I tried to find
> > examples in the Doc on howto compile applications correctly for
> > such a setup without compromising performance but I came short of
> > an example.
>
> From the sound of it, you have a heterogeneous configuration -- some
> nodes are x86_64 and some are x86. Because of this, you either have
> to compile your application twice, once for each platform or compile
> your application for the lowest common denominator. My guess would
> be that it easier and more foolproof if you compiled everything in 32
> bit mode. If you run in a mixed mode, using application schemas (see
> the mpirun man page) will be the easiest way to make things work.
>
>
> Brian
>

-- 
Eric Thibodeau
Neural Bucket Solutions Inc.
T. (514) 736-1436
C. (514) 710-0517