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Subject: Re: [OMPI users] Where to start with MPI on OSX?
From: Reuti (reuti_at_[hidden])
Date: 2012-11-11 16:16:06


Am 10.11.2012 um 00:55 schrieb shiny knight:

> Thanks Reuti for the sample.
>
> I have the latest Xcode available on the Apple dev center; Xcode 4 probably?

As I don't intend to develop for 10.7 or above I stayed with 3.2.6. In the beginning Xcode wasn't free and so I didn't look into it.

I can also compile the latest Open MPI 1.6.3 with the above version.

> 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

Yep.

-- Reuti

> 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:
>
> https://sites.google.com/site/dwhipp/tutorials/installing-open-mpi-on-mac-os-x
>
> While for MPICH2 I've followed this one:
>
> http://www.mpitutorial.com/installing-mpich2/
>
> 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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