Boris, can you please send Roy a standalone libMesh example that he can
just compile and run and trip the assert? Thanks,
On Thu, Nov 9, 2017 at 12:22 PM, Boris Boutkov <boris...@buffalo.edu> wrote:
> Having a simple DistributedMesh partitioner to compare vs ParMETIS would
> certainly be very useful in driving the original issue forward.
>
> The LinearPartitioner assert trip does appear reproducible with
> gcc7.2/mpich3.2 when running the refinement example
> <https://github.com/bboutkov/grins/tree/master_refine_test>from before.
> The initial mesh can be made as small as 4x4 for easier debugging, and to
> be totally explicit im building off libMesh master and manually attaching
> the partitioner right before partition() in prepare_for_use().
>
> Thanks for the help -
>
> On Thu, Nov 9, 2017 at 10:50 AM, Roy Stogner <royst...@ices.utexas.edu>
> wrote:
>
>>
>> On Thu, 9 Nov 2017, Boris Boutkov wrote:
>>
>> Well, I eliminated PETSc and have been linking to MPI using
>>> --with-mpi=$MPI_DIR and playing with the refinement example I had
>>> mentioned earlier to try and eliminate ParMETIS due the the
>>> hang/crash issue. In these configs I attach either the
>>> LinearPartitioner or an SFC in prepare_for_use right before calling
>>> partition(). This causes assert trips in MeshComm::Redistribute
>>> where elem.proc_id != proc_id while unpacking elems (stack below).
>>>
>>
>> Shoot - I don't think either of those partitioners have been upgraded
>> to be compatible with DistributedMesh use. Just glancing at
>> LinearPartitioner, it looks like it'll do fine for an *initial*
>> partitioning, but then it'll scramble everything if it's ever asked to
>> do a *repartitioning* on an already-distributed mesh.
>>
>> I could probably fix that pretty quickly, if you've got a test case I
>> can replicate.
>>
>> SFC, on the other hand, I don't know about. We do distributed
>> space-filling-curve stuff elsewhere in the library with libHilbert,
>> and it's not trivial.
>> ---
>> Roy
>>
>
>
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