[petsc-users] Mat local size zero

[Hui Zhang]

Hello,

I'm implementing a coarse problem for a domain decomposition preconditioner.
I use many processors to solve one subdomain and I want to pick one processor
for each subdomain to solve the global coarse problem.  So I need to set the 
local sizes of the coarse operator on the other processors to be zero.  Is 
this a good idea?  Thanks in advance!