Hello Stephan,
Could you share the Amat/Pmat in binary format of the specific fieldsplit
block, as well as all inputs needed to generate the same grid hierarchy (block
size, options used, near kernel)?
Alternatively, have you been able to generate the same error in a plain PETSc
example?
I’m
On Oct 6, 2023, at 3:48 AM, Mark Adams wrote:Pierre, (moved to dev)It looks like there is a subtle bug in the new MatFilter.My guess is that after the compression/filter the communication buffers and lists need to be recomputed because the graph has changed.Maybe an issue with
Stephan Kramer has a reproducer (see this thread) with 1500 processors.
They have lots of tests and this seemed to be the only, or the smallest,
one that failed.
I added a switch in GAMG to use your "low memory filter" to use this.
Stephan is accommodating and would test a fix.
Stephan has stack
