[slurm-users] Limit on number of nodes user able to request

[Sajesh Singh]

Slurm 20.02

CentOS 8

 

I just recently noticed a strange behavior when using the powersave plugin for bursting to AWS. I have a queue configured with 60 nodes, but if I submit a job to use all of the nodes I get the error:

 

(Nodes required for job are DOWN, DRAINED or reserved for jobs in higher priority partitions

 

If I lower the job to request 50 nodes it gets submitted and runs with no problems. I do not have and associations or QOS limits in place that would limit the user. Any ideas as to what could be causing this limit of 50 nodes to be imposed?

 

-Sajesh-

 

 

 

 

[Brian Andrus]

Do 'sinfo -R' and see if you have any down or drained nodes.

Brian Andrus

[Sajesh Singh]

No nodes in downed or drained state. These are nodes that are dynamically brought up and down via the powersave plugin. When the are taken offline due to being idle I believe the state is set to FUTURE by the powersave plugin.

 

-Sajesh-

 

 

From: slurm-users <slurm-use...@lists.schedmd.com> On Behalf Of Brian Andrus
Sent: Wednesday, March 24, 2021 11:02 PM
To: slurm...@lists.schedmd.com
Subject: Re: [slurm-users] Limit on number of nodes user able to request

 

EXTERNAL SENDER

[Sajesh Singh]

Some additional information after enabling debug3 on slurmctld daemon:

 

Logs show that there are enough usable nodes for the job:

 

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-11

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-12

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-13

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-14

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-15

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-16

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-17

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-18

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-19

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-20

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-21

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-22

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-23

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-24

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-25

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-26

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-27

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-28

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-29

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-30

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-31

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-32

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-33

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-34

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-35

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-36

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-37

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-38

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-39

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-40

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-41

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-42

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-43

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-44

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-45

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-46

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-47

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-48

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-49

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-50

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-51

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-52

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-53

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-54

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-55

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-56

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-57

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-58

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-59

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-60

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-61

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-62

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-63

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-64

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-65

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-66

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-67

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-68

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-69

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-70

[2021-04-01T10:39:14.400] debug2: found 1 usable nodes from config containing node-71

 

But then the following line is in the log as well:

debug3: select_nodes: JobId=67171529 required nodes not avail

 

--

 

-Sajesh-

 

[Brian Andrus]

For this one, you want to look closely at the job. Is it targeting a specific partition/nodelist?

See what resources it is looking for (scontrol show job <jobid>)
Also look at the partition limits as well as any QOS items (if you are using them).

Brian Andrus

[Sajesh Singh]

Brian,

  Targeting the correct partition and no QOS limits imposed that would cause this issue. The only way I found to remedy is to completely remove the cloud nodes from Slurm, restart slurmctld, readd nodes to Slurm, restart slurmctld.

 

I believe the issue is caused by when the nodes in the cloud go offline and slurmctld is no longer able to reach them. I am not able to change the node state manually so that slurmctld  will allow it to be used the next time a job requires it. I cannot set the state to CLOUD.

 

The other option may be to bring up all of the nodes that are in this unknown state so that slurmctld can go through the motions with them and them run the job again.

[Brian Andrus]

How are you taking them offline? I would expect a SuspendProgram script that is running the command that shuts them down. Also, one of your SlurmctldParameters should be "idle_on_node_suspend"

Brian Andrus