Re: [hwloc-users] AMD EPYC topology

2017-12-24 Thread Brice Goglin
Hello Make sure you use a very recent Linux kernel. There was a bug regarding L3 caches on 24-core Epyc processors which has been fixed in 4.14 and backported in 4.13.x (and maybe in distro kernels too). However, that would likely not cause huge performance difference unless your application

[hwloc-users] AMD EPYC topology

2017-12-24 Thread Matthew Scutter
I'm getting poor performance on OpenMPI tasks on a new AMD 7401P EPYC server. I suspect hwloc providing a poor topology may have something to do with it as I receive this warning below when creating a job. Requested data files available at Cheers, Matthew