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[bug #38092] Optionally support distributed memory machines using MPI

From: James Youngman
Subject: [bug #38092] Optionally support distributed memory machines using MPI
Date: Wed, 16 Jan 2013 14:03:26 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17

Follow-up Comment #6, bug #38092 (project findutils):

The --process_slot_var is documented in later findutils-4.5.x releases (you
can look at the latest version of the manpage here:

It looks to me like your requirements would be met by:

TOT_RANKS=# some decimal value
ARGS_PER_RANK=# another decimal value
xargs --process_slot_var=RANK -P $TOT_RANKS -n $ARGS_PER_RANK sh -c 'mpirun -n
$RANK  yourcommand "$@"' dollarzero  

The other obvious - and more readable - way to do this is to split the
argument file into however many chunks you need.  Then just run

for chunk in $total_chunks; do
  xargs -a chunks/$chunk mpirun -n $chunk yourcommmand


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