Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

> On Nov 25, 2014, at 01:12 , Gilles Gouaillardet > wrote: > > Bottom line, though Open MPI implementation of MPI_Dist_graph_create is not > deterministic, it is compliant with the MPI standard. > /* not to mention this is not the right place to argue what the

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

George, imho, you are right ! here is attached a new version of Ghislain's program and that uses MPI_Dist_graph_neighbors_count and MPI_Dist_graph_neighbors as you suggested. it produces correct results /* note that in this case, realDestinations is similar to targets, so i might have left

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

I would argue this is a typical user level bug. The major difference between the dist_create and dist_create_adjacent is that in the later each process provides its neighbors in an order that is expected (and that match the info provided to the MPI_Neighbor_alltoallw call. When the topology is

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

Ghislain, i can confirm there is a bug in mca_topo_base_dist_graph_distribute FYI a proof of concept is available at https://github.com/open-mpi/ompi/pull/283 and i recommend you use MPI_Dist_graph_create_adjacent if this meets your needs. as a side note, the right way to set the info is

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

Hi Gilles and Howard, The use of MPI_Dist_graph_create_adjacent solves the issue :) Thanks for your help! Best reagrds, Ghislain 2014-11-21 7:23 GMT+01:00 Gilles Gouaillardet : > Hi Ghislain, > > that sound like a but in MPI_Dist_graph_create :-( > > you can

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

Hi Ghislain, that sound like a but in MPI_Dist_graph_create :-( you can use MPI_Dist_graph_create_adjacent instead : MPI_Dist_graph_create_adjacent(MPI_COMM_WORLD, degrees, [0], [0], degrees, [0], [0], info, rankReordering, ); it does not crash and as far as i

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

Hi Ghislain, I tried to run your test with mvapich 1.9 and get a "message truncated" failure at three ranks. Howard 2014-11-20 8:51 GMT-07:00 Ghislain Viguier : > Dear support, > > I'm encountering an issue with the MPI_Neighbor_alltoallw request of > mpi-1.8.3. >

Re: [OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

For further information, the test also fails with MPI-1.8.4rc1. 2014-11-20 16:51 GMT+01:00 Ghislain Viguier : > Dear support, > > I'm encountering an issue with the MPI_Neighbor_alltoallw request of > mpi-1.8.3. > I have enclosed a test case with information of my

[OMPI users] MPI_Neighbor_alltoallw fails with mpi-1.8.3

Dear support, I'm encountering an issue with the MPI_Neighbor_alltoallw request of mpi-1.8.3. I have enclosed a test case with information of my workstation. In this test, I define a weighted topology for 5 processes, where the weight represent the number of buffers to send/receive : rank