Hi, I am running Slurm (v22.05.8) on 3 nodes each with the following specs: OS: Proxmox VE 8.1.4 x86_64 (based on Debian 12) CPU: AMD EPYC 7662 (128) GPU: NVIDIA GeForce RTX 4070 Ti Memory: 128 Gb
This is /etc/slurm/slurm.conf on all 3 computers without the comment lines: ClusterName=DlabCluster SlurmctldHost=server1 GresTypes=gpu ProctrackType=proctrack/linuxproc ReturnToService=1 SlurmctldPidFile=/var/run/slurmctld.pid SlurmctldPort=6817 SlurmdPidFile=/var/run/slurmd.pid SlurmdPort=6818 SlurmdSpoolDir=/var/spool/slurmd SlurmUser=root StateSaveLocation=/var/spool/slurmctld TaskPlugin=task/affinity,task/cgroup InactiveLimit=0 KillWait=30 MinJobAge=300 SlurmctldTimeout=120 SlurmdTimeout=300 Waittime=0 SchedulerType=sched/backfill SelectType=select/cons_tres JobCompType=jobcomp/none JobAcctGatherFrequency=30 SlurmctldDebug=debug3 SlurmctldLogFile=/var/log/slurmctld.log SlurmdDebug=debug3 SlurmdLogFile=/var/log/slurmd.log NodeName=server[1-3] RealMemory=128636 Sockets=1 CoresPerSocket=64 ThreadsPerCore=2 State=UNKNOWN Gres=gpu:1 PartitionName=mainPartition Nodes=ALL Default=YES MaxTime=INFINITE State=UP
I want to reserve a few cores and a few gigs of RAM for use only by the OS which cannot be accessed by jobs being managed by Slurm. What configuration do I need to do to achieve this?
Is it possible to reserve in a similar fashion a 'percent' of the GPU which Slurm cannot exceed so that the OS has some GPU resources?
Is it possible to have these configs be different for each of the 3 nodes?
Thanks!
Hi Shooktija,
On Wed, Apr 17, 2024 at 7:45 AM Shooktija S N via slurm-users < slurm-users@lists.schedmd.com> wrote:
NodeName=server[1-3] RealMemory=128636 Sockets=1 CoresPerSocket=64 ThreadsPerCore=2 State=UNKNOWN Gres=gpu:1 PartitionName=mainPartition Nodes=ALL Default=YES MaxTime=INFINITE State=UP
I want to reserve a few cores and a few gigs of RAM for use only by the OS which cannot be accessed by jobs being managed by Slurm. What configuration do I need to do to achieve this?
You want to look at these parameters for the Node section of slurm.conf https://slurm.schedmd.com/slurm.conf.html#OPT_CoreSpecCount https://slurm.schedmd.com/slurm.conf.html#OPT_MemSpecLimit
Is it possible to reserve in a similar fashion a 'percent' of the GPU which Slurm cannot exceed so that the OS has some GPU resources?
Not that I know of
Is it possible to have these configs be different for each of the 3 nodes?
Yes. You will need to define the nodes using 3 separate Node definitions versus one definition for all 3
Best,
-Sean
On a single Rocky8 workstation with one GPU where we wanted ssh interactive logins to it to have a small portion of its resources (shell, compiling, simple data manipulations, console desktop, etc) and the rest for SLURM we did this:
- Set it to use cgroupv2 * modify /etc/defaultg/grub to add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX. Remake grub with grub2-mkconfig * create file /usr/etc/cgroup_cpuset_init with the lines
#!/bin/bash echo "+cpuset" >> /sys/fs/cgroup/cgroup.subtree_control echo "+cpuset" >> /sys/fs/cgroup/system.slice/cgroup.subtree_control
* Modify/create /etc/systemd/system/slurmd.service.d/override.conf so it has:
[Service] ExecStartPre=-/usr/etc/cgroup_cpuset_init
- figure out exact cores to use for "free user" use and cores for SLURM. Also use GPU sharding in SLURM so GPU can be shared.
* install hwloc-ls * run 'hwloc-ls' to tranlate physical cores 0-9 to logical cores For me P 0-9 was Logical 0,2,4,6,8,10,12,14,16,18 * in /etc/slurm.conf the NodeName definition has
CPUs=128 Boards=1 SocketsPerBoard=1 CoresPerSocket=64 ThreadsPerCore=2 \ RealMemory=257267 MemSpecLimit=20480 \ CpuSpecList=0,2,4,6,8,10,12,14,16,18 \ TmpDisk=6000000 Gres=gpu:nvidia_a2:1,shard:nvidia_a2:32
reserving those 10 cores and 20GB of RAM for "free user"
* gres.conf has the lines:
AutoDetect=nvml Name=shard Count=32
* Need to add gres/shard to GresTypes= too. Job submissions use the option --gres=shard:N where N is less than 32
- Set up systemd to restrict "free users" to cores 0-9 and the 20GB
* Run: systemctl set-property user.slice MemoryHigh=20480M * Run for every individual user on the system
systemctl set-property user-$uid.slice AllowedCPUs=0-9
where $uid is that users user ID. We do this in a script that also runs sacctmgr to add them to the SLURM system
I could not just set this one for user.slice itself which is what I first tried because it then restricted the root user too and that cause wierd behavior with a lot of system tools. So far the root/daemon process work fine in the 20GB limit though so that MemoryHigh=20480M is one and done
Then reboot.
-- Paul Raines (http://help.nmr.mgh.harvard.edu)
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Paul Raines -
Sean Maxwell -
Shooktija S N