Re: [hwloc-users] [WARNING: A/V UNSCANNABLE] hwloc error after upgrading from Centos 6.5 to Centos 7 on Supermicro with AMD Opteron 6344

2016-01-07 Thread Brice Goglin
Hello Good to know, thanks. There are two ways to workaround the issue: * run "lstopo foo.xml" on a node that doesn't have the bug and do export HWLOC_XMLFILE=foo.xml and HWLOC_THISSYSTEM=1 on buggy nodes. (that's what you call a "map" below). Works with very old hwloc releases. * export

Re: [hwloc-users] [WARNING: A/V UNSCANNABLE] hwloc error after upgrading from Centos 6.5 to Centos 7 on Supermicro with AMD Opteron 6344

2016-01-07 Thread David Winslow
Brice, Thanks for the information! It’s good to know it wasn’t a flaw in the upgrade. This bug must have been introduced in kernel 3.x. I ran lstopo on on of our servers that still have Centos 6.5 and it correctly reports L3 cache for every 6 cores as shown below. We have 75 servers with the

Re: [hwloc-users] [WARNING: A/V UNSCANNABLE] hwloc error after upgrading from Centos 6.5 to Centos 7 on Supermicro with AMD Opteron 6344

2016-01-07 Thread Brice Goglin
Hello This is a kernel bug for 12-core AMD Bulldozer/Piledriver (62xx/63xx) processors. hwloc is just complaining about buggy L3 information. lstopo should report one L3 above each set of 6 cores below each NUMA node. Instead you get strange L3s with 2, 4 or 6 cores. If you're not binding tasks