Re: [OMPI users] Strange benchmarks at large message sizes

Hello Cooper Could you rerun your test with the following env. variable set export OMPI_MCA_coll=self,basic,libnbc and see if that helps? Also, what type of interconnect are you using - ethernet, IB, ...? Howard 2017-09-19 8:56 GMT-06:00 Cooper Burns : >

Re: [OMPI users] Fwd: Make All error regarding either "Conflicting" or "Previous Declaration" among others

. . . My sincerest apologies, I have gotten utterly mixed up; this is all new territory for me. On Tue, Sep 19, 2017 at 10:47 PM, r...@open-mpi.org wrote: > Err...you might want to ask the MPICH folks. This is the Open MPI mailing > list :-) > > On Sep 19, 2017, at 7:38 AM,

[OMPI users] Strange benchmarks at large message sizes

Hello, I have been running some simple benchmarks and saw some strange behaviour: All tests are done on 4 nodes with 24 cores each (total of 96 mpi processes) When I run MPI_Allreduce() I see the run time spike up (about 10x) when I go from reducing a total of 4096KB to 8192KB for example, when

Re: [OMPI users] Fwd: Make All error regarding either "Conflicting" or "Previous Declaration" among others

Err...you might want to ask the MPICH folks. This is the Open MPI mailing list :-) > On Sep 19, 2017, at 7:38 AM, Aragorn Inocencio > wrote: > > Good evening, > > Thank you for taking the time to develop and assist in the use of this tool. > > I am trying to