# CPUs on GPU nodes **URL:** \ **Category:** Users/Site Administrators\ **Created:** [October 3, 2024, 12:53pm UTC](https://community.openpbs.org/t/cpus-on-gpu-nodes/4003 "2024-10-03T12:53:19Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![boboshaq](https://avatars.discourse-cdn.com/v4/letter/b/bc8723/32.png) [@boboshaq](https://community.openpbs.org/u/boboshaq)\ **Post date:** [October 3, 2024, 12:53pm UTC](https://community.openpbs.org/t/cpus-on-gpu-nodes/4003/1 "2024-10-03T12:53:19Z")
Hi, I have a GPU node that also has CPU cores available. Can CPUs be used for different jobs and GPUs for others at the same time? OR should I create a separate queue for GPU nodes? ---
**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\ **Post date:** [October 3, 2024, 4:26pm UTC](https://community.openpbs.org/t/cpus-on-gpu-nodes/4003/2 "2024-10-03T16:26:32Z")
> [@boboshaq](#): > > Can CPUs be used for different jobs and GPUs for others at the same time? Yes, no problems > [@boboshaq](#): > > OR should I create a separate queue for GPU nodes? Not required , one queue is enough for both cpu and gpu jobs For example: You have one compute node with 36cores and 1 GPU card, 256GB memory or one nodeA with 20 core another nodeB with 10 cores and 1 GPU card ```auto qsub -q workq -l select=1:ncpus=20:mem=100gb -- /bin/sleep 2000 # cpu only job qsub -q workq -l select=1:ncpus=10:ngpus=1:mem=100gb -- /some/gpu_consuming_application # gpu job, will go to gpu node ``` ---
**Author:** ![boboshaq](https://avatars.discourse-cdn.com/v4/letter/b/bc8723/32.png) [@boboshaq](https://community.openpbs.org/u/boboshaq)\ **Post date:** [October 10, 2024, 12:27pm UTC](https://community.openpbs.org/t/cpus-on-gpu-nodes/4003/3 "2024-10-10T12:27:24Z")
Hello, Thank you for Your answer. I meant the case when: ```auto qsub -q workq -l select=1:ncpus=20:mem=100gb -- /bin/sleep 2000 # cpu only job qsub -q workq -l select=1:ncpus=5:ngpus=100:mem=100gb -- /some/gpu_consuming_application # gpu job, will go to gpu node qsub -q workq -l select=1:ncpus=5:mem=1gb -- /bin/sleep 2000 # is this goes to gpu node? ``` or ```auto qsub -q workq -l select=1:ncpus=20:mem=100gb -- /bin/sleep 2000 # cpu only job qsub -q workq -l select=1:ncpus=0:ngpus=1:mem=100gb -- /some/gpu_consuming_application # qsub -q workq -l select=1:ncpus=10:mem=1gb -- /bin/sleep 2000 # is this goes to gpu node? ``` Will all jobs start or will some have to wait until the ones on the GPU finish? ---
**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\ **Post date:** [October 10, 2024, 6:43pm UTC](https://community.openpbs.org/t/cpus-on-gpu-nodes/4003/4 "2024-10-10T18:43:20Z")
If there is 1 node in the cluster with 30 cores (ncpus) and 300GB Memory and 100 gpus cards (ngpus) - then the first and second set of qsub’ed jobs will go to this single node pbsnodes | grep -e ncpus -e ngpus -e mem resources\_available.mem = 300gb resources\_available.ncpus = 30 resources\_available.ngpus = 100 if you have 2 nodes in the cluster with one node having 100 ngpus - then the job with qsub request :ngpus=1 or ngpus=100 will go only to the gpu node - the job with qsub request that does not contain ngpu’s resource request, can run on either of the nodes. > [@boboshaq](#): > > Will all jobs start or will some have to wait until the ones on the GPU finish? If you have enough resources on the compute nodes satisfying all thes jobs , then they all can run in parallel If you have a compute node with 30 cores , 300GB Mem, 100 GPUs - then either set of qsub’s that is mentioned above can run in parallel on the same node.