[slurm-users] 4 sockets but "

Diego Zuccato diego.zuccato at unibo.it
Tue Jul 20 10:49:21 UTC 2021

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
    State=DOWN*+DRAIN ThreadsPerCore=2 TmpDisk=0 Weight=8 Owner=N/A 
    BootTime=None SlurmdStartTime=None
    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 
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?


Diego Zuccato
DIFA - Dip. di Fisica e Astronomia
Servizi Informatici
Alma Mater Studiorum - Università di Bologna
V.le Berti-Pichat 6/2 - 40127 Bologna - Italy
tel.: +39 051 20 95786

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