MPIDense row distribution on transpose.

[Alex Peyser]

All,

In petsc-2.3.3_p11, when I do a transpose on an MPIAIJ, the MatTranspose 
conserves the row distribution pattern of the parent, so a 5x5 matrix 
transposed can still be multiplied by a 5-vector that the parent could be 
multiplied by (0-1,2-4 for everyone). However, with an MPIDENSE, I get a row 
rearrangement so that mpi process 1,2 now have (0-2, 3-4), which leads to 
nonconforming object size errors.

Is this a known bug in MPIDense ? Is there a workaround - some way to force 
the matrix arrangement on tranpose for an MPIDense?

I see that in MatTranspose_MPIAIJ, MatSetSizes is called 
with (A->cmap.n, A->rmap.n, N, M), which conserves my layout, 
while in MatTranspose_MPIDense, MatSetSizes is called
with (PETSC_DECIDE, PETSC_DECIDE, N, M), which then ruins my layout. The 
former would appear to me the correct sequence.

Regards,
Alex Peyser
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