See
# https://www.open-mpi.org/faq/?category=running#mpirun-hostfile
# http://mirror.its.dal.ca/openmpi/faq/?category=running#simple-spmd-run
# https://www.open-mpi.org/faq/?category=rsh
# https://docs.oracle.com/cd/E19923-01/820-6793-10/ExecutingBatchPrograms.html
<source lang="bash">
ssh localhost env | grep -i path
ssh bax env | grep -i path
mpirun --host localhost hostname
mpirun --mca plm_base_verbose 10 --host localhost hostname
mpirun --host bax hostname
mpirun --mca plm_base_verbose 10 --host bax hostname
mpirun --host localhost,bax hostname
mpirun --mca plm_base_verbose 10 --host localhost,bax hostname
mpirun --report-bindings -np 1 --host localhost uptime
mpirun --report-bindings -np 2 --host tomat uptime