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Closed 7 years ago .

I currently have MPICH (release 3.1.4) installed on my machine (running Mac OS X 10.10.5). I would like to remove it and install OpenMPI instead but could find no instructions online on how to uninstall MPICH .

Is it sufficient to simply delete MPICH 's directory? If so, where can I find it? I thought I had installed it in usr/local and did find some MPI-related files there (in a folder named include ) but nothing that seemed like it was the whole thing.

Also, I am planning to use OpenMPI together with Intel's c++ compiler. Is there some preferred order of installation of these two?

This depends highly on the system you installed it on, and the installation method you used. – haraldkl Sep 14, 2015 at 15:27 @haraldkl Indeed I forgot to mention that. I am working on OS X Version 10.10.5. To install MPICH , I downloaded mpich-3.1.4.tar.gz from the MPICH download page and followed the installation instructions. – Janosh Sep 14, 2015 at 15:34 @Jeff The problem is I only learned about homebrew when googling for how to uninstall MPICH . Homebrew sounds like a good idea for the future, however. Is it possible to install Intel's c++ compiler via homebrew and would you recommend that? – Janosh Sep 15, 2015 at 8:06 Not sure what you mean by 'the directory you compiled'. Do you mean the directory that is created when unpacking mpich-3.1.4.tar.gz ? I just tried that and was met with make: *** No rule to make target uninstall. Stop. . – Janosh Sep 15, 2015 at 8:02 You probably either freshly unpacked it or did a make distclean at some stage. If it's the case, then you need to first do a ./configure blah with 'blah' being the configure options you used when installing the package... Once the the configure step done, make uninstall should just work. – Gilles Sep 15, 2015 at 8:12 You're right. I did delete and then reunpack mpich-3.1.4.tar.gz . [Note for others who might read this thread and don't remember the options they passed during the first configuration: They can be retrieved from .bash_history which is located (but hidden) in the user directory.] After reconfiguration, I tried make uninstall again and received three error messages, the last one being make: *** [uninstall-recursive] Error 1 . Previously it had said rm: opa_util.h: Permission denied which I assumed had caused this error so I tried sudo make uninstall . [Ran out of characters...] – Janosh Sep 15, 2015 at 8:42 sudo make uninstall ran a lot longer and finished with Making uninstall in examples and make[1]: Nothing to be done for uninstall. . I assume that means deinstallation was successful? – Janosh Sep 15, 2015 at 8:44