You may want to see if you have MacPorts installed. Typically (but not always), /opt/local is from a MacPorts installation. If it is then it's very easy to remove mpich and install openmpi.
To check for MacPorts, see if /opt/local/bin/port exists. Then, sudo port uninstall --follow-dependencies mpich2 sudo port install openmpi FYI, I'm using OpenMPI 1.6 with XCode 4.5.2 on 10.8.2 and it works fine. Mark On Fri, Nov 9, 2012 at 6:55 PM, shiny knight <theshinykni...@me.com> wrote: > 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: > > > 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 > > > > <demo.m>_______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
