OpenMPI library compiled for gfortran for Macintosh using ARM with OSX 14.1:
<p>
<A HREF=openmpi-4.1.6_gfortran_arm.tgz>openmpi-4.1.6_gfortran_arm.tgz</A>
<p>
This should be put into /usr/local/ and /usr/local/openmpi/bin needs
to be in the path.
 
The MPI libraries here are provided for Nagfor compiler on OSX systems.

The following MPI library works for Macintosh system using ARM chips:
<p>
<A HREF=mpich-4.1.2_nagfor_arm.tgz>mpich-4.1.2_nagfor_arm.tgz</A>
<p>
As root (sudo -s), open the tar file inside NAG_fortran and link it
<pre>
cd /usr/local/lib/NAG_Fortran
tar xzf mpich-4.1.2_nagfor_arm.tgz
cd /usr/local
rm -f mpi
ln -s /usr/local/lib/NAG_Fortran/mpich mpi
</pre>
The following MPI library only works for 64-bit Macintosh system using Intel chips:
<p>
<A HREF=mpich-3.2.1_nagfor_fpp.tgz>mpich-3.2.1_nagfor_fpp.tgz</A>
<p>
As root (sudo -s), open the tar file and link it
<pre>
cd /usr/local/
tar xzf mpich-3.2.1_nagfor_fpp.tgz
rm -f mpi
ln -s mpich-3.2.1 mpi
</pre>
Exit from the super user mode (Ctrl-D or exit).
<p>
In both cases include /usr/local/mpi/bin into the path in the ~/.cshrc
or similar file, then
<pre>
source .cshrc
rehash
</pre>
Then type
<pre>
which mpif90
</pre>
to see if it is found. Now you should be able to compile the code
with NAG Fortran and MPICH. To avoid run time errors due to some security
settings (software is not from Apple), it may be necessary to do the
following:
<pre>
xattr -d com.apple.quarantine /usr/local/mpi/bin/mpiexec
xattr -d com.apple.quarantine /usr/local/mpi/bin/hydra_pmi_prox
spctl --master-disable
</pre>
Possibly the last command by itself is sufficient.
<p>
For some MPI implementations it may be necessary to create
a public SSH key of the machine with
<pre>
ssh-keygen 
</pre>
(hit return to all questions) and the resulting public key
file should be added to the authorized keys:
<pre>
cat .ssh/id_rsa.pub >> .ssh/authorized_keys
</pre>
Even if not needed for running MPI parallel code, the public key is useful 
for passwordless ssh/scp/rsync etc. access.