mpirun -np 4 commsplit
/opt/scali/bin/mpimon -stdin all  commsplit  --  gal72 1 gal71 1 gal65 1 gal64 1

myrank    0 ival    0
myrank    1 ival    1
myrank    2 ival    2
myrank    3 ival    3

MYRANK    0 SIZE    4 NEW_RANK    0 NEW_SIZE    2
MYRANK    1 SIZE    4 NEW_RANK    1 NEW_SIZE    2
MYRANK    2 SIZE    4 NEW_RANK    0 NEW_SIZE    2
MYRANK    3 SIZE    4 NEW_RANK    1 NEW_SIZE    2

myrank    0 ival    0 isum    1
myrank    1 ival    1 isum    1
myrank    2 ival    2 isum    5
myrank    3 ival    3 isum    5