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Running SLURM in a laptop
by Antonio Rius 19 Feb '25

19 Feb '25

For testing purposes I am using SLURM installed in a lenovo laptop running ubuntu 24-04. I am trying this configuration as part of my slurm learning process before using a real HPC facility. In my trial I want to submit an array of 9 independent processes. The CPU information of such machine is: Total Logical CPUs: 16 Physical Cores: 12 Threads per Core: 2 ================================= and the slurm script (attached) that I am using contain the sentences : #SBATCH --job-name=process_pkl #SBATCH --array=1-9 #SBATCH --output=/tmp/process_pkl_%A_%a.out #SBATCH --error=/tmp/process_pkl_%A_%a.err #SBATCH --ntasks=1 #SBATCH --cpus-per-task=1 #SBATCH --mem=2G =================================== but in practice, using htop, only 4 processes are running concurrently, and there are other 12 CPUs without activity. My question is: What am I missing in my setup?

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slurmrestd health check
by Hagdorn, Magnus Karl Moritz 19 Feb '25

19 Feb '25

Hi there, we use haproxy to distribute SLURM REST API requests to multiple instances of slurmrestd. For the haproxy we need a health check. At the moment we are just checking that we get a 401 status. This works but we are ending up with a lot of noise in the log files. It would be very nice if there was an unauthenticated REST API endpoint that can be used to check the daemon is up. Has anybody solved this issue? Refards magnus -- Dr. Magnus Hagdorn Charité – Universitätsmedizin Berlin Geschäftsbereich IT | Scientific Computing

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/etc/passwd sync?
by mark.w.moorcroft＠ama-inc.com 19 Feb '25

19 Feb '25

If you set up slurm elastic cloud in EC2 without LDAP, what is the recommended method for sync of the passwd/group files? Is this necessary to get openmpi jobs to run. I would swear I had this working last week without synced passwd on two nodes. But thinking about it now I'm not sure how this could have worked. My home directories are in an NFS mount, but the user accounts don't exist on the node AMI. I'm using ansible/packer to manage the AMI's. When I ran OpenHPC / Slurm on bare metal there was a sync process. This is my first AWS Slurm cluster rodeo. I can't use the Amazon Parallel Computing tools because we are forced to be in GovCloud. I started with "ClusterInTheCloud", but it's all 4 years old, and semi-broken out of the box. My manager had me ditch a lot of it (including LDAP). So I'm building out a fork that is getting heavily modded for our situation. An ORTE daemon has unexpectedly failed after launch and before communicating back to mpirun. This could be caused by a number of factors, including an inability to create a connection back to mpirun due to a lack of common network interfaces and/or no route found between them. Please check network connectivity

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how to set slurmdbd.conf if using two slurmdb node with HA database?
by taleintervenor＠sjtu.edu.cn 19 Feb '25

19 Feb '25

The deployment scenario is as follows: nodeA nodeB (slurmctld) (backup slurmctld) | \-------------------------------/ | | / \ | nodeC nodeD (slurmdbd) (backup slurmdbd) (mysql) <--multi master replica--> (mysql) Since the database is multi-master replicated, the slurmdbd should only talk to the mysql on its own node. In such case, how should we set the slurmdbd.conf? The conf file contains options "DbdAddr", "DbdHost" and "DbdBackupHost". Should they be consistent between nodeA-2 and nodeB-2? Such as: DbdAddr = nodeC | DbdAddr = nodeC DbdHost = nodeC | DbdHost = nodeC DbdBackupHost = nodeD | DbdBackupHost = nodeD StorageHost = nodeC | StorageHost = nodeD Or maybe just set different conf and don't use the "DbdBackupHost" like: DbdAddr = nodeC | DbdAddr = nodeD DbdHost = nodeC | DbdHost = nodeD StorageHost = nodeC | StorageHost = nodeD I'm quite confused about the usage of DbdAddr and DbdHost. What is the difference between them and why only DbdHost has the backup one? Another confusing point is how DbdBackupHost work. I guess It is slurmctld that is responsible for selecting the available slurmdbd. Since the slurm.conf already contains "AccountingStorageHost" and "AccountingStorageBackupHost", why we need set backupdbd again on slurmdbd side?

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Run only one time on a node
by John Hearns 19 Feb '25

19 Feb '25

I am running single node tests on a cluster. I can select named nodes using the -2 flag with sbatch. However - if I want to submit perhaps 20 test jobs is there any smart way to run only one time on a node? I know I could touch a file with the hostname and test for that file. I am just wondering if there is a smarter way to do this.\ I should point out that the tests take a few minutes to run, so if a node finishes a test run it could become idle and run the tests again.

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Create filenames based on slurm hosts
by John Hearns 15 Feb '25

15 Feb '25

I am working on power logging of a GPU cluster I am working with. I am running jobs on multiple hosts. I wanst to create a file , one for each host, which has a unique filename containing the host name. Something like clush -w $SLURM_JOB_NODELIST "touch file$(hostname)" My foo is weak today. Help me Ole Wan Neilsen or any $Jedi

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avoid using same GPU by the interactive job
by navin srivastava 13 Feb '25

13 Feb '25

hi, facing an issue in my environment where the batch job and the interactive job use the same gpu. Each server has 2 gpu. When 2 batch jobs are running it works fine and use the 2 different gpu's. but if one batch job is running and another job is submitted interactively then it uses the same GPU . Is there a way to avoid this? GresTypes=gpu NodeName=node[01-02] NodeAddr=node[01-02] CPUs=48 Boards=1 SocketsPerBoard=2 CoresPerSocket=24 ThreadsPerCore=1 TmpDisk=6000000 RealMemory=515634 Feature=A100 Gres=gpu:2 PartitionName=onprem Nodes=node[01-10] Default=YES MaxTime=21-00:00:00 DefaultTime=3-00:00:00 State=UP Shared=YES OverSubscribe=NO gres.conf: Name=gpu File=/dev/nvidia0 Name=gpu File=/dev/nvidia1 Any suggestions on this. Regards Navin

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error no error
by Ricardo Román-Brenes 13 Feb '25

13 Feb '25

Hello. Could someone enlighten me as to what this error message is? Feb 13 10:02:00 gpu1 slurmd[573705]: slurmd: error: slurm_msg_sendto: address:port=192.168.9.1:36698 msg_type=8001: No error

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Re: /etc/passwd sync?
by Mark W. Moorcroft 12 Feb '25

12 Feb '25

I made some progress without need for the /etc/passwd sync. Sbatch is working fine on multi-node jobs it appears. Now only salloc runs fail, which I guess is expected behavior without user account sync and ssh key setup. On bare metal OpenHPC, warewulf handles all that for me. So presumably I have MPI keys, but not user account sync and keys. Again, on OpenHPC they populated keys on account creation, and passwd was synced to the boot image. Can anyone tell me what this is about? slurmctld[46449]: slurmctld: error: failed to generate json for resume job/node list Mark Moorcroft Senior Linux Administrator Analytical Mechanics Associates

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Re: /etc/passwd sync?
by Mark W. Moorcroft 12 Feb '25

12 Feb '25

The only service found in gov cloud with a search for “parallel” is Batch. And the awscli commands are absent there as well. In commercial cloud “parallel” yields many services. Mark Moorcroft Senior Linux Administrator Analytical Mechanics Associates e. mark.w.moorcroft(a)ama-inc.com<mailto:mark.w.moorcroft@ama-inc.com> w. ama-inc.com<https://ama-inc.com/> t. +1 408-290-5455 _____________________________________ Confidentiality Notice: This e-mail is intended only for the addressee named above. It contains information that is privileged, confidential or otherwise protected from use and disclosure. If you are not the intended recipient, you are hereby notified that any review, disclosure, copying, or dissemination of this transmission, or taking of any action in reliance on its contents, or other use is strictly prohibited. If you have received this transmission in error, please reply to the sender listed above immediately and permanently delete this message from your inbox. Thank you for your cooperation.

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