[petsc-users] PETSc read binary matrix row by row

[Donald Duck]

Hello everyone

A piece of c++ code writes PETSc AIJ matrices to binary files. My task is
to compute an average matrix of these AIJ matrices. Therefore I read the
first matrix with petsc4py and then start to add the other matrices to it.
All matrixes always have the same size, shape, nnz etc.

However in some cases these matrices are large and only one of it fits into
memory and the reading/writing takes a significant amout of time. Is there
a way to read it row by row to prevent memory overflow?

I'm also open for other suggestions, thanks in advance!

Raphael
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