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| abstract:darwin:runjobs:runjobs [2021-04-22 18:42] – [Introduction] anita | abstract:darwin:runjobs:runjobs [2022-06-03 12:53] (current) – [Runtime environment] anita |
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| Without a job scheduler, a cluster user would need to manually search for the resources required by his or her job, perhaps by randomly logging-in to nodes and checking for other users' programs already executing thereon. The user would have to "sign-out" the nodes he or she wishes to use in order to notify the other cluster users of resource availability((Historically, this is actually how some clusters were managed!)). A computer will perform this kind of chore more quickly and efficiently than a human can, and with far greater sophistication. | Without a job scheduler, a cluster user would need to manually search for the resources required by his or her job, perhaps by randomly logging-in to nodes and checking for other users' programs already executing thereon. The user would have to "sign-out" the nodes he or she wishes to use in order to notify the other cluster users of resource availability((Historically, this is actually how some clusters were managed!)). A computer will perform this kind of chore more quickly and efficiently than a human can, and with far greater sophistication. |
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| Slurm is an open source, fault-tolerant, and highly scalable cluster management and job scheduling system for large and small Linux clusters. Documentation for the current version of Slurm provide by SchedMD [[https://slurm.schedmd.com/documentation.html|SchedMD Slurm Documentation]]. | Slurm is an open source, fault-tolerant, and highly scalable cluster management and job scheduling system for large and small Linux clusters. Documentation for the current version of Slurm provided by SchedMD [[https://slurm.schedmd.com/documentation.html|SchedMD Slurm Documentation]]. |
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| You may find it helpful when migrating from one scheduler to another such as GridEngine to Slurm refer to SchedMD's [[https://slurm.schedmd.com/rosetta.pdf|rosetta]] showing equivalent commands across various schedulers. | You may find it helpful when migrating from one scheduler to another such as GridEngine to Slurm to refer to SchedMD's [[https://slurm.schedmd.com/rosetta.pdf|rosetta]] showing equivalent commands across various schedulers and their [[https://slurm.schedmd.com/pdfs/summary.pdf|command/option summary (two pages)]]. |
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| <note tip>It is a good idea to periodically check in ''/opt/templates/slurm/'' for updated or new [[technical:slurm:darwin:templates:start|templates]] to use as job scripts to run generic or specific applications, designed to provide the best performance on DARWIN.</note> | <note tip>It is a good idea to periodically check in ''/opt/shared/templates/slurm/'' for updated or new [[technical:slurm:darwin:templates:start|templates]] to use as job scripts to run generic or specific applications designed to provide the best performance on DARWIN.</note> |
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| Need help? See [[http://www.hpc.udel.edu/presentations/intro_to_slurm/|Introduction to Slurm]] in UD's HPC community cluster environment. | Need help? See [[http://www.hpc.udel.edu/presentations/intro_to_slurm/|Introduction to Slurm]] in UD's HPC community cluster environment. |
| <note>Slurm uses a //partition// to embody the common set of properties that define what nodes they include, and general system state. A //partition// can be considered job queues representing a collection of computing entities each of which has an assortment of constraints such as job size limit, job time limit, users permitted to use it, etc. Priority-ordered jobs are allocated nodes within a partition until the resources (nodes, processors, memory, etc.) within that partition are exhausted. Once a job is assigned a set of nodes, the user is able to initiate parallel work in the form of job steps in any configuration within the allocation. The term //queue// will most often imply a //partition//.</note> | <note>Slurm uses a //partition// to embody the common set of properties that define what nodes they include, and general system state. A //partition// can be considered job queues representing a collection of computing entities each of which has an assortment of constraints such as job size limit, job time limit, users permitted to use it, etc. Priority-ordered jobs are allocated nodes within a partition until the resources (nodes, processors, memory, etc.) within that partition are exhausted. Once a job is assigned a set of nodes, the user is able to initiate parallel work in the form of job steps in any configuration within the allocation. The term //queue// will most often imply a //partition//.</note> |
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| When submitting a job to Slurm, a user can explicitly specify which partition to use: doing so will place that partitions's resource restrictions (e.g. maximum execution time, maximum memory) on the job, even if they are not appropriate. Usually it is easier if the user specifies what resources his or her job requires and lets Slurm choose an appropriate partition. | When submitting a job to Slurm, a user must set their workgroup prior to submitting a job **and** explicitly request a single partition as part of the job submission doing so will place that partitions's resource restrictions (e.g. maximum execution time) on the job, even if they are not appropriate. |
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| | See [[abstract/darwin/runjobs/queues|Queues]] on the <html><span style="color:#ffffff;background-color:#2fa4e7;padding:3px 7px !important;border-radius:4px;">sidebar</span></html> for detailed information about the available partitions on DARWIN. |
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| The Slurm workload manager is used to manage and control the computing resources for all jobs submitted to a cluster. This includes load balancing, reconciling requests for memory and processor cores with availability of those resources, suspending and restarting jobs, and managing jobs with different priorities. | The Slurm workload manager is used to manage and control the computing resources for all jobs submitted to a cluster. This includes load balancing, reconciling requests for memory and processor cores with availability of those resources, suspending and restarting jobs, and managing jobs with different priorities. |
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| In order to schedule any job (interactively or batch) on a cluster, you must set your [[abstract:darwin:app_dev:compute_env#using-workgroup-and-directories|workgroup]] to define your cluster workgroup. | In order to schedule any job (interactively or batch) on a cluster, you must set your [[abstract:darwin:app_dev:compute_env#using-workgroup-and-directories|workgroup]] to define your allocation workgroup **and** explicitly request a single partition. |
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| See [[abstract/darwin/runjobs/schedule_jobs|Scheduling Jobs]] and [[abstract/darwin/runjobs/job_status|Managing Jobs]] on the <html><span style="color:#ffffff;background-color:#2fa4e7;padding:3px 7px !important;border-radius:4px;">sidebar</span></html> for general information about getting started with scheduling and managing jobs on a cluster using Slurm. | See [[abstract/darwin/runjobs/schedule_jobs|Scheduling Jobs]] and [[abstract/darwin/runjobs/job_status|Managing Jobs]] on the <html><span style="color:#ffffff;background-color:#2fa4e7;padding:3px 7px !important;border-radius:4px;">sidebar</span></html> for general information about getting started with Slurm commands for scheduling and managing jobs on DARWIN. |
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| ===== Runtime environment ===== | ===== Runtime environment ===== |
| You do not need this command when you | You do not need this command when you |
| - type commands, or source the command file, | - type commands, or source the command file, |
| - include lines in the file to be submitted to the sbatch. | - include lines in the file to be submitted with sbatch. |
| </note> | </note> |
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| <code bash> | <code bash> |
| [traine@darwin ~]$ man squeue | [traine@login00.darwin ~]$ man squeue |
| </code> | </code> |
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