Hello,

I’m running some tests in a very small testing environment (before applying in the real scenario). My environment is only a computer with a old Intel i4 with this “lscpu” configuration:

Architecture:        x86_64

CPU(s):              8

On-line CPU(s) list: 0-7

Thread(s) per core:  2

Core(s) per socket:  4

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

BIOS Vendor ID:      Intel(R) Corporation

CPU family:          6

Model:               26

Model name:          Intel(R) Core(TM) i7 CPU         950  @ 3.07GHz

“slurmd -C” returns: “CPUs=8 Boards=1 SocketsPerBoard=1 CoresPerSocket=4 ThreadsPerCore=2”.

My slurm.conf is configured with:

SelectType=select/cons_tres

SelectTypeParameters=CR_Core

AccountingStorageTRES=cpu,mem,node,billing,fs/disk,vmem,pages

After running a simple “helloworld” test, I have noticed that if SelectTypeParameters=CR_Core, system always reserves me an even number of CPUs (during “pending” time, I can see the real number I have requested, but when job starts “running”, that number is increased to the next even number).

Howerver, if I reconfigure slurm with SelectTypeParameters=CR_CPU, system reserves me the correct number of CPUs (during “pending” time and, also, during “running” time). I suppose that my system must be configured with CR_CPU, according https://slurm.schedmd.com/cons_tres.html, but could someone confirm that?

Thanks.