Hi Roy
I found what is breaking the flow.
Please consider the code below.
I thought the "active_elements" were the same across the processors. It
seems that is not the case?
Then the point_locator (which is a collective task - right?) breaks sync
across processors.
My code intends to map values from one mesh to the other.
What is the best construction for that?
Should I use "elements_begin/end" iterator instead?
=== CODE
MBcit el = mesh.active_elements_begin();
MBcit end_el = mesh.active_elements_end();
for ( ; el != end_el; ++el) {
...
UniquePtr<PointLocatorBase> plocator = mesh.sub_point_locator();
elem = (*plocator)( pt );
...
}
On Fri, May 3, 2019 at 9:30 PM Renato Poli <rebp...@gmail.com> wrote:
> Thanks.
>
> Should I call "parallel_object_only()" throughout the code to check when
> it lost sync?
> Any smarter way to do that?
> What GDB can do for me?
> Parallel debugging is really something new to me...
>
> On Fri, May 3, 2019 at 7:34 PM Stogner, Roy H <royst...@ices.utexas.edu>
> wrote:
>
>>
>> On Fri, 3 May 2019, Renato Poli wrote:
>>
>> > I see a number of error messages, as below.
>> > I am struggling to understand what they mean and how to move forward.
>> > It is related to manually setting a system solution and closing the
>> > "solution" vector afterwards.
>> > Any idea?
>> >
>> > Assertion
>> >
>> `(this->comm()).verify(std::string("./include/libmesh/petsc_vector.h").size())'
>> > failed.
>> > Assertion
>> > `(this->comm()).verify(std::string("src/mesh/mesh_base.C").size())'
>> failed.
>> > [Assertion
>> >
>> `(this->comm()).verify(std::string("./include/libmesh/petsc_vector.h").size())'
>> > failed.
>> > [2] Assertion
>> >
>> `(this->comm()).verify(std::string("./include/libmesh/petsc_vector.h").size())'
>> > failed.[0] ./include/libmesh/petsc_vector.h, line 812, compiled Feb 22
>> 2019
>> > at 17:56:59
>> > 1] src/mesh/mesh_base.C, line 511, compiled Feb 22 2019 at 17:55:09
>> > ./include/libmesh/petsc_vector.h, line 812, compiled Feb 22 2019 at
>> 17:56:59
>> > application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0
>> > application called MPI_Abort(MPI_COMM_WORLD, 1) - process 1
>> > application called MPI_Abort(MPI_COMM_WORLD, 1) - process 2
>> >
>> > Thanks,
>> > Renato
>>
>> You're running in parallel, but your different processors have gotten
>> out of sync. At least 1 is at mesh_base.C line 511, and at least 2 or
>> 3 are at petsc_vector.h 812. Are you not calling PetscVector::close()
>> on every processor, perhaps? Then the missing processor would
>> continue to whatever the next parallel-only operation is and the
>> dbg/devel mode check for synchronization would fail.
>> ---
>> Roy
>>
>
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