HP XC System 2.x Software Using SLURM, 6.1 Introduction, 6.2 SLURM Commands, Table 6-1:SLURM Commands

6

Using SLURM

6.1 Introduction

HP XC uses the Simple Linux Utility for Resource Management (SLURM) for system resource management and job scheduling. SLURM is a reliable, efficient, open source, fault-tolerant, job and compute resource manager with features that make it suitable for large-scale, high performance computing environments. SLURM can report on machine status, perform partition management, job management, and job scheduling.

The SLURM Reference Manual is available on the HP XC Documentation CD-ROM and from the following Web site: http://www.llnl.gov/LCdocs/slurm/.

As a system resource manager, SLURM has the following key functions:

•Allocate exclusive and/or non-exclusive access to resources (compute nodes) to users for some duration of time so they can perform work

•Provide a framework for starting, executing, and monitoring work (normally a parallel job) on the set of allocated nodes

•Arbitrate conflicting requests for resources by managing a queue of pending work

Section 1.4.3 describes the interaction between SLURM and LSF.

6.2 SLURM Commands

Users interact with SLURM through its command line utilities. SLURM has the following basic commands: srun, scancel, squeue, sinfo, and scontrol, which can run on any node in the HP XC system. These commands are summarized in Table 6-1and described

in the following sections.

Table 6-1: SLURM Commands

Command Function

srun	Submits jobs to run under SLURM management. srun is used to submit a job for
	execution, allocate resources, attach to an existing allocation, or initiate job steps.
	srun can:
	• Submit a batch job and then terminate
	• Submit an interactive job and then persist to shepherd the job as it runs
	•	Allocate resources to a shell and then spawn that shell for use in running
		subordinate jobs
squeue	Displays the queue of running and waiting jobs (or "job steps"), including the JobID
	used for scancel), and the nodes assigned to each running job. It has a wide variety
	of filtering, sorting, and formatting options. By default, it reports the running jobs in
	priority order and then the pending jobs in priority order.
scancel	Cancels a pending or running job or job step. It can also be used to send a specified
	signal to all processes on all nodes associated with a job. Only job owners or
	administrators can cancel jobs.

Using SLURM 6-1