Re: [OMPI devel] NP64 _gather_ problem

Here's a clue: ompi_coll_tuned_gather_intra_dec_fixed() changes its algorithm for job sizes > 60 to some binomial method. I changed the threshold to 100 and my NP64 jobs run fine. Now to try and understand what about ompi_coll_tuned_gather_intra_binomial() is causing these connect delays...

Re: [OMPI devel] NP64 barrier problem

Oops. One key typo here: This is the IMB-MPI1 gather test, not barrier. :( On 9/16/2010 12:05 PM, Steve Wise wrote: Hi, I'm debugging a performance problem with running IMB-MP1/barrier in an NP64 cluster (8 nodes, 8 cores each). I'm using openmpi-1.4.1 from the OFED-1.5.1 distribution.

[OMPI devel] NP64 barrier problem

Hi, I'm debugging a performance problem with running IMB-MP1/barrier in an NP64 cluster (8 nodes, 8 cores each). I'm using openmpi-1.4.1 from the OFED-1.5.1 distribution. The BTL is openib/iWARP via Chelsio's T3 RNIC. In short, a NP60 and smaller run completes in a timely manner as expect