[petsc-users] Partition of parallel AIJ sparce matrix

[Qin Lu]

Hello,
 
Does a process have to own consecutive rows of the matrix? For example, suppose 
the global AIJ is 4x4, partitioned by 2 processes. Does process 1 have to own 
rows 1 and 2, process 2 own rows 3 and 4? Or process1 may own rows 1 and 3, and 
process 2 own row 2 and 4?
 
Thanks a lot for your help!
 
Regards,
Qin