On Thu, 10 Aug 2017, Renato Poli wrote:
>> If you want remote DoF values in parallel you have to sync or serialize them yourself.
If I understood, this serialization should be done upfront once, before iterating through the elements.
Ideally, this serialization is done *never*. But if you're writing GUI code you're probably stuck calling those methods from a single process, right?
As in introduction_ex4, it seems that the parallelization is confined in "solve", which returns only after the job is all done.
Nope. When a range is set up from mesh.active_local_elements_begin() to _end(), the "local" part of that means you're only iterating over elements which are local to the current processor. So no serialization is ever done. Later in the assembly, the "add_matrix" and "add_vector" calls are essentially the first halves of parallel actions - they queue up values to be accumulated when the solver closes the parallel matrix and vector later.
I should then serialize to the master node just after the "solve". Is that right?
If you need to, then that's when to do it. --- Roy ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
