Re: [hwloc-users] AMD EPYC topology

2017-12-29 Thread Matthew Scutter
Following up on this, Indeed with a recent kernel the error message goes away. The poor performance stays though (a few percent difference between 4.13 and 4.15rc5), and I'm at a loss as to whether it's related to MPI or not. I see oddities such as locking the job to the first 12 cores yield 100%

Re: [hwloc-users] AMD EPYC topology

2017-12-29 Thread Brice Goglin
Le 29/12/2017 à 23:15, Bill Broadley a écrit : > > > Very interesting, I was running parallel finite element code and was seeing > great performance compared to Intel in most cases, but on larger runs it was > 20x > slower. This would explain it. > > Do you know which commit, or anything else

Re: [hwloc-users] AMD EPYC topology

2017-12-29 Thread Bill Broadley
Very interesting, I was running parallel finite element code and was seeing great performance compared to Intel in most cases, but on larger runs it was 20x slower. This would explain it. Do you know which commit, or anything else that might help find any related discussion? I tried a few