[petsc-users] A question about DMPlexDistribute

[leejearl]

Hi, all:
     I want to use PETSc to build my FVM code. Now, I have a question about
the function  DMPlexDistribute(DM dm, PetscInt overlap, PetscSF *sf, DM 
*dmOverlap) .

     In the example "/petsc-3.7.2/src/ts/examples/tutorials/ex11.c". 
When I set the overlap
as 0 or 1, it works well. But, if I set the overlap as 2, it suffers a 
problem.
     I am confused about the value of overlap. Can it be set as 2? What 
is the meaning of
the parameter overlap?
     Any helps are appreciated!

leejearl