2/24/2023 0 Comments Slurm tmpdisksrun has a wide variety of options to specify resource requirements, including: minimum and maximum node count, processor count, specific nodes to use or not use, and specific node characteristics (so much memory, disk space, certain required features, etc.). Srun is used to submit a job for execution or initiate job steps in real time. By default, it reports the running jobs in priority order and then the pending jobs in priority order. It has a wide variety of filtering, sorting, and formatting options. Squeue reports the state of jobs or job steps. Sprio is used to display a detailed view of the components affecting a job’s priority. Sinfo reports the state of partitions and nodes managed by Slurm. Note that many scontrol commands can only be executed as user root. Scontrol is the administrative tool used to view and/or modify Slurm state. It can also be used to send an arbitrary signal to all processes associated with a running job or job step. Scancel is used to cancel a pending or running job or job step. This can be used to effectively use diskless compute nodes or provide improved performance relative to a shared file system. Sbcast is used to transfer a file from local disk to local disk on the nodes allocated to a job. The script will typically contain one or more srun commands to launch parallel tasks. Sbatch is used to submit a job script for later execution. One can attach to and detach from jobs multiple times. Sattach is used to attach standard input, output, and error plus signal capabilities to a currently running job or job step. The shell is then used to execute srun commands to launch parallel tasks. Typically this is used to allocate resources and spawn a shell. Salloc is used to allocate resources for a job in real time. Sacct is used to report job or job step accounting information about active or completed jobs. Note that the command options are all case sensitive. The command option -help also provides a brief summary of options. Man pages exist for all Slurm daemons, commands, and API functions. For instance, a single job step may be started that utilizes all nodes allocated to the job, or several job steps may independently use a portion of the allocation. 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. Priority-ordered jobs are allocated nodes within a partition until the resources (nodes, processors, memory, etc.) within that partition are exhausted. The partitions can be considered job queues, each of which has an assortment of constraints such as job size limit, job time limit, users permitted to use it, etc. The entities managed by these Slurm daemons, shown in Figure 2, include nodes, the compute resource in Slurm, partitions**, which group nodes into logical (possibly overlapping) sets, jobs, or allocations of resources assigned to a user for a specified amount of time, and job steps, which are sets of (possibly parallel) tasks within a job. All of the commands can run anywhere in the cluster. The user commands include: sacct, sacctmgr, salloc, sattach, sbatch, sbcast, scancel, scontrol, scrontab, sdiag, sh5util, sinfo, sprio, squeue, sreport, srun, sshare, sstat, strigger and sview. The slurmd daemons provide fault-tolerant hierarchical communications. As depicted in Figure 1, Slurm consists of a slurmd daemon running on each compute node and a central slurmctld daemon running on a management node (with optional fail-over twin).
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