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hpc:faq [2023/11/13 11:42]
Yann Sagon [I'm leaving UNIGE, can I continue to use Baobab HPC service?] 		hpc:faq [2023/12/13 08:37] (current)
Yann Sagon [Can I run interactive tasks ?]
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 </code> </code>
  
-=== I'm leaving UNIGE, can I continue to use Baobab HPC service? ===+==== I'm leaving UNIGE, can I continue to use Baobab HPC service? ====
 Yes it is possible as long as you collaborate tightly with your former research group. Your PI must invite you as [[hpc:access_the_hpc_clusters#outsider_account|outsider]]. For technical reason, your account needs to be expired prior doing the request for the invitation. Yes it is possible as long as you collaborate tightly with your former research group. Your PI must invite you as [[hpc:access_the_hpc_clusters#outsider_account|outsider]]. For technical reason, your account needs to be expired prior doing the request for the invitation.
 We'll then reactivate your account. You'll keep your data. We'll then reactivate your account. You'll keep your data.
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 See [[hpc/slurm#interactive_jobs|Interactive jobs]] See [[hpc/slurm#interactive_jobs|Interactive jobs]]
  
 +==== I'm not able to use all the cores of a compute node ====
 +Indeed, we are reserving two cores per node for system tasks such as data transfer, and os stuff.
 +
 +<code>
 +(yggdrasil)-[root@admin1 ~]$ scontrol show node cpu001
 +NodeName=cpu001 Arch=x86_64 CoresPerSocket=18
 +   CPUAlloc=0 CPUEfctv=34 CPUTot=36 CPULoad=0.01
 +   AvailableFeatures=GOLD-6240,XEON_GOLD_6240,V9
 +   ActiveFeatures=GOLD-6240,XEON_GOLD_6240,V9
 +   Gres=(null)
 +   NodeAddr=cpu001 NodeHostName=cpu001 Version=23.02.1
 +   OS=Linux 4.18.0-477.10.1.el8_8.x86_64 #1 SMP Tue May 16 11:38:37 UTC 2023
 +   RealMemory=187000 AllocMem=0 FreeMem=185338 Sockets=2 Boards=1
 +   CoreSpecCount=2 CPUSpecList=17,35 <==================== this means we have two specialization cores <<<<
 +   State=IDLE ThreadsPerCore=1 TmpDisk=150000 Weight=10 Owner=N/A MCS_label=N/A
 +   Partitions=debug-cpu
 +   BootTime=2023-08-10T12:08:11 SlurmdStartTime=2023-08-10T12:09:00
 +   LastBusyTime=2023-08-11T10:06:42 ResumeAfterTime=None
 +   CfgTRES=cpu=34,mem=187000M,billing=34
 +   AllocTRES=
 +   CapWatts=n/a
 +   CurrentWatts=0 AveWatts=0
 +   ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
 +
 +</code>
 +
 +If you really need to use all the cores of a compute node, you can override this parameter: ''--core-spec=0''. This will implicitly lead to an exclusive allocation of the node.
 +
 +ref: https://slurm.schedmd.com/core_spec.html
  
  
hpc/faq.1699872161.txt.gz · Last modified: 2023/11/13 11:42 by Yann Sagon

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