Yeap, exactly the hostfile I have is of the form node1 slots=1 node2 slots=1 node3 slots=1
where the above hostnames are resolved in ~/.ssh/config file which has entries of the form Host node1 HostName 192.168.0.100 User ubuntu IdentityFile ~/.ssh/mykey.pem and so on. So the mpirun cannot pickup the hostfile by itself and I have to specify it each time. On Fri, May 11, 2018 at 4:02 PM, Jeff Squyres (jsquyres) <jsquy...@cisco.com > wrote: > Can you provide some more detail? I'm not able to get this to fail (i.e., > it seems to be working as expected for me). > > For example, what's the contents of your /etc/openmpi/openmpi-default-hostfile > -- did you list some hostnames in there? > > > > On May 11, 2018, at 4:43 AM, Konstantinos Konstantinidis < > kostas1...@gmail.com> wrote: > > > > Hi, > > > > I have built Open MPI 2.1.2 multiple times on Ubuntu 16.04 and then I > add the line > > > > orte_default_hostfile=/etc/openmpi/openmpi-default-hostfile > > > > to the file > > > > /etc/openmpi/openmpi-mca-params.conf > > > > and I execute > > > > sudo chown myUsername /etc/openmpi/openmpi-default-hostfile > > > > For some reason this change never goes through and each time I run a > program with mpirun only one local process runs. So I have to manually > specify my hostname with the --hostfile argument. > > > > What can be the cause of this? > > > > The exact series of commands I use for building is the following > > > > sudo apt-get update > > sudo apt-get upgrade > > sudo apt-get install g++ > > sudo apt-get install valgrind > > sudo apt-get install libopenmpi-dev > > sudo apt-get install gfortran > > sudo apt-get install make > > wget https://www.open-mpi.org/software/ompi/v2.1/downloads/ > openmpi-2.1.2.tar.gz > > tar -xvf openmpi-* && cd openmpi-* > > ./configure --prefix=/usr/local --enable-mpi-cxx --enable-debug > --enable-memchecker --with-valgrind=/usr > > sudo make all install > > > > Then, I add the following lines to the .bashrc file (Is this necessary?) > > > > export PATH="$PATH:/usr/local/bin" > > export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib" > > > > for setting the path and library path, respectively and of course reload > .bashrc. > > > > Is the above way of installing Open MPI correct? I am really wondering > since I have no solid Linux knowledge. > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://lists.open-mpi.org/mailman/listinfo/users > > > -- > Jeff Squyres > jsquy...@cisco.com > >
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