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:
http://git.savannah.gnu.org/cgit/findutils.git/tree/xargs/xargs.1).
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
done
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