# PBS on a single node / CPU? **URL:** \ **Category:** Users/Site Administrators\ **Created:** [April 19, 2020, 2:31am UTC](https://community.openpbs.org/t/pbs-on-a-single-node-cpu/2083 "2020-04-19T02:31:07Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![hob63](https://avatars.discourse-cdn.com/v4/letter/h/77aa72/32.png) [@hob63](https://community.openpbs.org/u/hob63)\ **Post date:** [April 19, 2020, 2:31am UTC](https://community.openpbs.org/t/pbs-on-a-single-node-cpu/2083/1 "2020-04-19T02:31:08Z")
Hi all, I run a lot of numerical simulations and usually use a managed cluster, however, I’m looking to have my own ‘server’ at home to run small sized jobs. For the simulations I require a few of cores per simulation and so something like the TR 3990X from AMD (64 cores) seems to fit the bill (I would go with a cluster but space is a limiting factor). My question is, can something like PBS be used on a single node /CPU to schedule jobs to each core of the CPU so that I could use cores 1-10 for job 1, 11-20 for job 2 etc, with each core being 100% dedicated to the task. I assume at least one core would need to be used for the actual scheduling? Are there any potential issues to doing this? Thanks for any input! ---
**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\ **Post date:** [April 19, 2020, 8:15pm UTC](https://community.openpbs.org/t/pbs-on-a-single-node-cpu/2083/2 "2020-04-19T20:15:51Z")
1. Sure you can do that using PBS Pro . 2. You can set resources\_avaialble.ncpus=63 on your all in one PBS Pro Complex (server/sched/comm/mom) 3. You can then submit jobs as below : qsub -l select=1:ncpus=10:mem=10gb:mpiprocs=10 – /application/executable parameters qsub -l select=1:ncpus=10:mem=10gb:mpiprocs=10 – /application/executable parameters Note : - here your application / MPI is intelligent enough to map or pin the cores - PBS Pro schedules the jobs on to the compute nodes and runs the application, it is application that runs that needs to utilise the cores to 100% , PBS Pro cannot make the application to use 100% of each of the cores. 1. Otherwise 3 + Cgroups would do the job which would efficiently take care of OOM. some things to take care: reserve some cores and memory for the Operating System and its services ( including PBS Pro server/scheduler ) qmgr : set node nodename resources\_available.ncpus=60 ( if the node has 64 cores ) qmgr : set node nodename resources\_available.mem=60gb (if the node has 64gb of memory) Hope this helps Thank you ---
**Author:** ![hob63](https://avatars.discourse-cdn.com/v4/letter/h/77aa72/32.png) [@hob63](https://community.openpbs.org/u/hob63)\ **Post date:** [April 20, 2020, 9:30am UTC](https://community.openpbs.org/t/pbs-on-a-single-node-cpu/2083/3 "2020-04-20T09:30:13Z")
Hi Adarsh, Many thanks for the reply, it is much appreciated to answer the quesitons. Would the usage of a GUI cause any issues with this or can you specify a GUI in linux to run using only a few specific cores? ---
**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\ **Post date:** [April 20, 2020, 9:58am UTC](https://community.openpbs.org/t/pbs-on-a-single-node-cpu/2083/4 "2020-04-20T09:58:49Z")
> [@hob63](#): > > Would the usage of a GUI cause any issues with this or can you specify a GUI in linux to run using only a few specific cores? There would not be any issues using the GUI, provided the GUI uses single core You can submit a interactive job qsub -I -X select=1:ncpus=1:mem=10gb and then once you get a console, then launch the GUI. If you want more control, then cgroups would help for sure.