Correction: I have E5-2620v4, which is 8-core Broadwell. Please excuse my error earlier.
On Wed, Aug 02, 2023 at 01:23:18PM +0000, Max R. Dechantsreiter wrote: > Hi Brice, > > Well, the VPS gives me a 4-core slice of an Intel(R) Xeon(R) > CPU E5-2620 node, which is Sandy Bridge EP, with 6 physical > cores, so probably 12 cores on the node. The numbering does > seem wacky: it seems to describe a node with 2 8-core CPUs. > > This is the VPS on which I host my Web site; I use its shell > account for sundry testing, mostly of build procedures. > > Is there anything I could do to get hwloc to work? > > Regards, > > Max > --- > > > On Wed, Aug 02, 2023 at 03:12:27PM +0200, Brice Goglin wrote: > > Hello > > > > There's something wrong in this machine. It exposes 4 cores (number 0 to 3) > > and no NUMA node, but says the only allowed resources are cores 8-15,24-31 > > and NUMA node 1. That's why hwloc says the topology is empty (running lstopo > > --disallowed shows NUMA 0 and cores 0-3 in red, which means they aren't > > allowed). How did this get configured so badly? > > > > Brice > > > > > > > > Le 02/08/2023 à 14:54, Max R. Dechantsreiter a écrit : > > > Hello, > > > > > > On my VPS I tested my build of hwloc-2.9.2 by running lstopo: > > > > > > ./lstopo > > > hwloc: Topology became empty, aborting! > > > Segmentation fault > > > > > > On a GCP n1-standard-2 a similar build (GCC 12.2 vs. 13.2) seemed to work: > > > > > > ./lstopo > > > hwloc/nvml: Failed to initialize with nvmlInit(): Driver Not Loaded > > > Machine (7430MB total) > > > Package L#0 > > > NUMANode L#0 (P#0 7430MB) > > > L3 L#0 (45MB) + L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + > > > Core L#0 > > > PU L#0 (P#0) > > > PU L#1 (P#1) > > > HostBridge > > > PCI 00:03.0 (Other) > > > Block(Disk) "sda" > > > PCI 00:04.0 (Ethernet) > > > Net "ens4" > > > PCI 00:05.0 (Other) > > > > > > (from which I conclude my build procedure is correct). > > > > > > At the suggestion of Brice Goglin (in response to my post of the same > > > issue to Open MPI Users), I rebuilt with '--enable-debug' and ran lstopo; > > > then I also ran > > > > > > hwloc-gather-topology hwloc-gather-topology > > > > > > The resulting lstopo.tar.gz and hwloc-gather-topology.tar.gz are attached, > > > as I was unable to recognize the underlying problem, although I believe it > > > could be a system issue, for my builds of OpenMPI on the VPS used to work > > > before a new OS image was installed. > > > > > > Max > > > _______________________________________________ hwloc-users mailing list hwloc-users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/hwloc-users
