HelloThere'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
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