[petsc-dev] MatCreateSubMatrices in parallel with n=0 on a process causes memory leak

[Brad Aagaard]

PETSc developers,

In PyLith we call MatCreateSubMatrices() and MatDestroyMatrices() with 
potentially different numbers of submatrices on each process. If each 
process has a nonzero number of submatrices things appear to be working 
fine. If a process has zero submatrices, I am getting a memory leak on 
that process (as reported by -malloc_dump). I did not get this behavior 
with PETSc 3.7.2 and earlier with MatGetSubMatrices() and 
MatDestroyMatrices().

Do I need to do something special when calling MatCreateSubMatrices() or 
MatDestroyMatrices() when the number of submatrices on a process is zero?

The log with the petsc log summary and malloc dump output is attached.

Thanks,
Brad


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