Hi Diego,
2. Did you define a Sub NUMA Cluster (SNC) BIOS setting? Then each
physical socket would show up as two sockets (memory controllers), for
a total of 8 "sockets" in your 4-socket system.
I don't think so. Unless that's the default, I didn't change anything in
the BIOS. Just checked the second of the three nodes (still no SO
installed) and found it under Chipset Configuration -> North bridge ->
UPI configuration -> SNC : it's set to Disable.
OK. Performance may be a bit higher with SNC enabled.
3. Which Slurm version are you running, and which OS version?
Slurm 18.08.5, standard packages from Debian stable.
Uh, that's an old Slurm which will have many bugs that are fixed in
later releases. It seems that a number of sites use the very old Debian
distribution packages rather than modern Slurm versions :-(
4. What is the output of "slurmd -C" (Print actual hardware
configuration) on the node?
root@str957-mtx-20:~# slurmd -C
NodeName=str957-mtx-20 CPUs=192 Boards=1 SocketsPerBoard=4
CoresPerSocket=24 ThreadsPerCore=2 RealMemory=1160347
UpTime=1-01:50:48
So the node seems to correctly recognizes the underlying HW.
I tried to copy&paste "SocketsPerBoard=4 CoresPerSocket=24
ThreadsPerCore=2 RealMemory=1160347" in the nodes definition line (the
only difference being SocketsPerBoard instead of Sockets), but the
result is always the same.
In 20.02 there was a bug with Boards and SocketsPerBoard, don't remember
if that was a problem in 18.08 as well. See the link below for references.
Maybe delete Boards=1 SocketsPerBoard=4 and try Sockets=4 in stead?
Maybe my Wiki notes could be helpful?
https://wiki.fysik.dtu.dk/niflheim/Slurm_configuration#compute-node-configuration
Tks. Interesting, but I don't se pam_slurm_adopt. Other than that, it
seems very much like what I'm doing.
The pam_slurm_adopt is very useful :-)
On 7/20/21 12:49 PM, Diego Zuccato wrote:
Hello all.
It's been since yesterday that I'm facing this issue.
I'm configuring 3 new quad-socket nodes defined as:
NodeName=str957-mtx-[20-22] Sockets=4 CoresPerSocket=24 \
RealMemory=1160347 Weight=8 Feature=ib,matrix,intel,avx
But scontrol show node str957-mtx-20 reports:
NodeName=str957-mtx-20 CoresPerSocket=1
[...]
RealMemory=1160347 AllocMem=0 FreeMem=N/A Sockets=2 Boards=1
MemSpecLimit=2048
State=DOWN*+DRAIN ThreadsPerCore=2 TmpDisk=0 Weight=8 Owner=N/A
MCS_label=N/A
Partitions=m3
BootTime=None SlurmdStartTime=None
CfgTRES=cpu=4,mem=1160347M,billing=2783
AllocTRES=
CapWatts=n/a
CurrentWatts=0 LowestJoules=0 ConsumedJoules=0
ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
Reason=Low socket*core*thread count, Low CPUs
The only thing that's right is that ThreadsPerCore=2 ...
The last block from "cat /proc/cpuinfo" on the node reports:
processor : 191
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Xeon(R) Platinum 8268 CPU @ 2.90GHz
stepping : 7
microcode : 0x5003003
cpu MHz : 1200.331
cache size : 36608 KB
physical id : 3
siblings : 48
core id : 29
cpu cores : 24
apicid : 251
initial apicid : 251
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs
bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni
pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16
xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm
3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single intel_ppin
ssbd mba ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority
ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid
cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb
intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves
cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln
pts pku ospke avx512_vnni md_clear flush_l1d arch_capabilities
bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs taa
itlb_multihit
bogomips : 5804.13
clflush size : 64
cache_alignment : 64
address sizes : 46 bits physical, 48 bits virtual
power management:
I already tried changing the line to cheat (telling it there are only
2 sockets with 24 cores, thus reducing to half node) but nothing
changed. I restarted slurmctld after every change in slurm.conf just
to be sure.
Any idea?
