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Subject: Re: [OMPI users] Where to start with MPI on OSX?
From: shiny knight (theshinyknight_at_[hidden])
Date: 2012-11-09 18:55:14

Thanks Reuti for the sample.

I have the latest Xcode available on the Apple dev center; Xcode 4 probably?

I think that the reason why nothing happens is because the code runs via MPICH2; tried to launch mpicc with the -echo flag and i see in the output

-I/opt/local/include/mpich2 -L/opt/local/lib -lpmpich -lmpich -lopa -lmpl -lpthread

which makes me think that i am using MPICH2; I just need to figure out how to remove it now...found a dir in opt/local/include that is called mpich2 but I am not sure if is enough to just delete that dir.

 When I have installed OpenMPI I followed the instructions on this site:

While for MPICH2 I've followed this one:

Most likely I've put them on top of each other and messed up both

On Nov 9, 2012, at 2:32 AM, Reuti wrote:

> Am 09.11.2012 um 08:47 schrieb shiny knight:
>> Thanks for your replies.
>> I use Snow Leopard, running ompi_info returns an error (command not found).
> I'm on this version too. Which version of Xcode do you use - "Xcode 3.2.6 and iOS SDK 4.3"? Attached is a small file which I can compile with the mentioned command.
> $ mpicc demo.m -o demo -O0 -ObjC -framework Foundation -framework CoreLocation
> $ mpiexec -np 2 ./demo
>> I was looking for installers and I remember that I have installed MPICH2 if I recall correctly (I didn't knew about openMPI until today), so I have mpicc installed.
>> Should I remove MPICH2 and install OpenMPI?
> Yes.
> Different MPI implementations have to be installed in different locations and the paths set accordingly. Also note, that an application compiled with Open MPI can't be started with MPICH2 `mpiexec` and vice versa. Well, yes - it could be started but it will only run in serial in all instances like you can start any application with `mpiexec`. As `mpicc` is only a wrapper to provide additonal paths arguments to -I/-L/-l, all usual options apply. In principle MPI applications can also be compiled by a plain gcc, but then you have to take care of all the necessary libraries on your own.
> -- Reuti
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