Disclaimer: This post is quite long as I tried to provide all relevant configuration information.
Status and Problem:
I adminster a gpu cluster and I want to use slurm for job management. Unfortunatelly, I cannot request GPUs using the respective generic resources plugin of slurm.
Note: test.sh is a small script printing the environment variable CUDA_VISIBLE_DEVICES.
Running job with --gres=gpu:1 does not complete
Running srun -n1 --gres=gpu:1 test.sh results in the following error:
srun: error: Unable to allocate resources: Requested node configuration is not available
Log:
gres: gpu state for job 83
gres_cnt:4 node_cnt:0 type:(null)
_pick_best_nodes: job 83 never runnable
_slurm_rpc_allocate_resources: Requested node configuration is not available
Running job with --gres=gram:500 does complete
If I call srun -n1 --gres=gram:500 test.sh however, the job runs and prints
CUDA_VISIBLE_DEVICES=NoDevFiles
Log:
sched: _slurm_rpc_allocate_resources JobId=76 NodeList=smurf01 usec=193
debug: Configuration for job 76 complete
debug: laying out the 1 tasks on 1 hosts smurf01 dist 1
job_complete: JobID=76 State=0x1 NodeCnt=1 WIFEXITED 1 WEXITSTATUS 0
job_complete: JobID=76 State=0x8003 NodeCnt=1 done
Thus slurm seems to be correctly configured to run jobs using srun with requested generic resources using --gres but does not recognize the gpus for some reason.
My first idea was to use another name for the gpu generic resource as the other generic resources seem to work but I'd like to stick to the gpu plugin.
Configuration
The cluster has more than two slave hosts but for the sake of clarity i'll stick to two slightly differently configured slave hosts and the controller host: papa (controller), smurf01 and smurf02.´
slurm.conf
The generic-resrouce-relevant parts of the slurm configuration:
...
TaskPlugin=task/cgroup
...
GresTypes=gpu,ram,gram,scratch
...
NodeName=smurf01 NodeAddr=192.168.1.101 Feature="intel,fermi" Boards=1 SocketsPerBoard=2 CoresPerSocket=6 ThreadsPerCore=2 Gres=gpu:tesla:8,ram:48,gram:no_consume:6000,scratch:1300
NodeName=smurf02 NodeAddr=192.168.1.102 Feature="intel,fermi" Boards=1 SocketsPerBoard=2 CoresPerSocket=6 ThreadsPerCore=1 Gres=gpu:tesla:8,ram:48,gram:no_consume:6000,scratch:1300
...
Note: ram is in GB, gram is in MB and scratch in GB again.
Output of scontrol show node
NodeName=smurf01 Arch=x86_64 CoresPerSocket=6
CPUAlloc=0 CPUErr=0 CPUTot=24 CPULoad=0.01 Features=intel,fermi
Gres=gpu:tesla:8,ram:48,gram:no_consume:6000,scratch:1300
NodeAddr=192.168.1.101 NodeHostName=smurf01 Version=14.11
OS=Linux RealMemory=1 AllocMem=0 Sockets=2 Boards=1
State=IDLE ThreadsPerCore=2 TmpDisk=0 Weight=1
BootTime=2015-04-23T13:58:15 SlurmdStartTime=2015-04-24T10:30:46
CurrentWatts=0 LowestJoules=0 ConsumedJoules=0
ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
NodeName=smurf02 Arch=x86_64 CoresPerSocket=6
CPUAlloc=0 CPUErr=0 CPUTot=12 CPULoad=0.01 Features=intel,fermi
Gres=gpu:tesla:8,ram:48,gram:no_consume:6000,scratch:1300
NodeAddr=192.168.1.102 NodeHostName=smurf02 Version=14.11
OS=Linux RealMemory=1 AllocMem=0 Sockets=2 Boards=1
State=IDLE ThreadsPerCore=1 TmpDisk=0 Weight=1
BootTime=2015-04-23T13:57:56 SlurmdStartTime=2015-04-24T10:24:12
CurrentWatts=0 LowestJoules=0 ConsumedJoules=0
ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
smurf01 configuration
GPUs
> ls /dev | grep nvidia
nvidia0
...
nvidia7
> nvidia-smi | grep Tesla
| 0 Tesla M2090 On | 0000:08:00.0 Off | 0 |
...
| 7 Tesla M2090 On | 0000:1B:00.0 Off | 0 |
...
gres.conf
Name=gpu Type=tesla File=/dev/nvidia0 CPUs=0
Name=gpu Type=tesla File=/dev/nvidia1 CPUs=1
Name=gpu Type=tesla File=/dev/nvidia2 CPUs=2
Name=gpu Type=tesla File=/dev/nvidia3 CPUs=3
Name=gpu Type=tesla File=/dev/nvidia4 CPUs=4
Name=gpu Type=tesla File=/dev/nvidia5 CPUs=5
Name=gpu Type=tesla File=/dev/nvidia6 CPUs=6
Name=gpu Type=tesla File=/dev/nvidia7 CPUs=7
Name=ram Count=48
Name=gram Count=6000
Name=scratch Count=1300
smurf02 configuration
GPUs
Same configuration/output as smurf01.
gres.conf on smurf02
Name=gpu Count=8 Type=tesla File=/dev/nvidia[0-7]
Name=ram Count=48
Name=gram Count=6000
Name=scratch Count=1300
Note: The deamons have been restarted, the machines have been rebooted as well. The slurm and job submitting user have same ids/groups on slave and controller nodes and the munge authentication is working properly.
Log outputs
I added DebugFlags=Gres in the slurm.conf file and the GPUs seem to be recognized by the Plugin:
Controller log
gres / gpu: state for smurf01
gres_cnt found : 8 configured : 8 avail : 8 alloc : 0
gres_bit_alloc :
gres_used : (null)
topo_cpus_bitmap[0] : 0
topo_gres_bitmap[0] : 0
topo_gres_cnt_alloc[0] : 0
topo_gres_cnt_avail[0] : 1
type[0] : tesla
topo_cpus_bitmap[1] : 1
topo_gres_bitmap[1] : 1
topo_gres_cnt_alloc[1] : 0
topo_gres_cnt_avail[1] : 1
type[1] : tesla
topo_cpus_bitmap[2] : 2
topo_gres_bitmap[2] : 2
topo_gres_cnt_alloc[2] : 0
topo_gres_cnt_avail[2] : 1
type[2] : tesla
topo_cpus_bitmap[3] : 3
topo_gres_bitmap[3] : 3
topo_gres_cnt_alloc[3] : 0
topo_gres_cnt_avail[3] : 1
type[3] : tesla
topo_cpus_bitmap[4] : 4
topo_gres_bitmap[4] : 4
topo_gres_cnt_alloc[4] : 0
topo_gres_cnt_avail[4] : 1
type[4] : tesla
topo_cpus_bitmap[5] : 5
topo_gres_bitmap[5] : 5
topo_gres_cnt_alloc[5] : 0
topo_gres_cnt_avail[5] : 1
type[5] : tesla
topo_cpus_bitmap[6] : 6
topo_gres_bitmap[6] : 6
topo_gres_cnt_alloc[6] : 0
topo_gres_cnt_avail[6] : 1
type[6] : tesla
topo_cpus_bitmap[7] : 7
topo_gres_bitmap[7] : 7
topo_gres_cnt_alloc[7] : 0
topo_gres_cnt_avail[7] : 1
type[7] : tesla
type_cnt_alloc[0] : 0
type_cnt_avail[0] : 8
type[0] : tesla
...
gres/gpu: state for smurf02
gres_cnt found:TBD configured:8 avail:8 alloc:0
gres_bit_alloc:
gres_used:(null)
type_cnt_alloc[0]:0
type_cnt_avail[0]:8
type[0]:tesla
Slave log
Gres Name = gpu Type = tesla Count = 8 ID = 7696487 File = / dev / nvidia[0 - 7]
...
gpu 0 is device number 0
gpu 1 is device number 1
gpu 2 is device number 2
gpu 3 is device number 3
gpu 4 is device number 4
gpu 5 is device number 5
gpu 6 is device number 6
gpu 7 is device number 7
