[MITgcm-support] tile size oddity? (2nd attempt)

[m. r. schaferkotter]

greetings;

for some testing i/ve got a small 4-processor MPI job that seems to  
produce tiles of unequal size.

relevant setup informations:

from run/data

  globalFiles=.FALSE.,
  useSingleCpuIO=.FALSE.,

from code/SIZE.h
       PARAMETER (
      &           sNx =   54,
      &           sNy =   30,
      &           OLx =    3,
      &           OLy =    3,
      &           nSx =    1,
      &           nSy =    1,
      &           nPx =    2,
      &           nPy =    2,

2 processors in each direction. i expect all tiles to be the same size.

[me at mach run]$ ls XG*
XG.001.001.data  XG.001.002.data  XG.002.001.data  XG.002.002.data
XG.001.001.meta  XG.001.002.meta  XG.002.001.meta  XG.002.002.meta

there are four tiles (files) of geographical coordinates.

in matlab, each of the tiles are read in:

xg11 = rdmds('XG.001.001');
xg21 = rdmds('XG.002.001');
xg12 = rdmds('XG.001.002');
xg22 = rdmds('XG.002.002');


now here/s where i/m surprised:

 >> size(xg11)

ans = 54    30

 >> size(xg21)

ans = 108    30

 >> size(xg12)

ans = 54    60

 >> size(xg22)

ans = 108    60

i didn/t expect that.

now from the shell, all of the *.data files are the same size:

[me at mach run]$ ls -l XG*.data
-rw-r--r-- 1 me group 12960 Oct 30 20:59 XG.001.001.data
-rw-r--r-- 1 me group 12960 Oct 30 20:59 XG.001.002.data
-rw-r--r-- 1 me group 12960 Oct 30 20:59 XG.002.001.data
-rw-r--r-- 1 me group 12960 Oct 30 20:59 XG.002.002.data

can someone explain this to me?

michael