Hi Diego,
The Xeon Platinum 8268 is a 24-core CPU:
https://ark.intel.com/content/www/us/en/ark/products/192481/intel-xeon-platinum-8268-processor-35-75m-cache-2-90-ghz.html
Questions:
1. So you have 4 physical sockets in each node?
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.
3. Which Slurm version are you running, and which OS version?
4. What is the output of "slurmd -C" (Print actual hardware configuration)
on the node?
FYI: We have some dual-socket Xeon Cascade Lake (20 cores) servers with
SNC enabled, and I have in slurm.conf:
NodeName=s001 Sockets=4 CoresPerSocket=10 ThreadsPerCore=2 RealMemory=191000
That is a total of 80 cores including the Hyperthreading.
Maybe my Wiki notes could be helpful?
https://wiki.fysik.dtu.dk/niflheim/Slurm_configuration#compute-node-configuration
Best regards,
Ole
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?
