workload managers

Slurm and Moab
Slurm and Moab are two workload manager systems that have been used to schedule and manage user jobs run on Livermore Computing (LC) clusters. Currently, LC runs Slurm natively on most clusters, and provides Moab "wrappers" now that Moab has been decommissioned. This tutorial presents the essentials for using Slurm and Moab wrappers on LC platforms

What is a Workload Manager?
The typical LC cluster is a finite resource that is shared by many users.
In the process of getting work done, users compete for a cluster's nodes, cores, memory, network, etc.
In order to fairly and efficiently utilize a cluster, a special software system is employed to manage how work is accomplished.
Commonly called a Workload Manager. May also be referred to (sometimes loosely) as:
Batch system
Batch scheduler
Workload scheduler
Job scheduler
Resource manager (usually considered a component of a Workload Manager)
Tasks commonly performed by a Workload Manager:
Provide a means for users to specify and submit work as "jobs"
Evaluate, prioritize, schedule and run jobs
Provide a means for users to monitor, modify and interact with jobs
Manage, allocate and provide access to available machine resources
Manage pending work in job queues
Monitor and troubleshoot jobs and machine resources
Provide accounting and reporting facilities for jobs and machine resources
Efficiently balance work over machine resources; minimize wasted resources
https://computing.llnl.gov/tutorials/moab/

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• SchedMD® is the core company behind the Slurm workload manager software, a free open-source workload manager designed specifically to satisfy the demanding needs of high performance computing. 

https://www.schedmd.com/

• Slurm vs Moab/Torque on Deepthought HPC clusters

Intro and Overview: What is a scheduler?
A high performance computing (HPC) cluster (hereafter abbreviated HPCC) like the Deepthought clusters consists of many compute nodes, but at the same time have many users submitting many jobs, often very large jobs. The HPCC needs a mechanism to distribute jobs across the nodes in a reasonable fashion; this is the task of a program called a scheduler.
This is a complicated tasks: the various jobs can have various requirements ( e.g. CPU, memory, diskspace, network transportation, etc. ) as well as differing priorities. And because we want to enable large parallel jobs to run, the scheduler needs to be able to reserve nodes for larger jobs (i.e. if an user submits a job requiring 100 nodes, and only 90 nodes are currently free, the scheduler might need to keep other jobs off the 90 free nodes in order that the 100 node job might eventually run). The scheduler must also account for nodes which are down, or have insufficient resources for a particular job, etc. As such, a resource manager is also needed (which can either be integrated with the scheduler or run as a separate program). The scheduler will also need to interface with an accounting system (which also can be integrated into the scheduler) to handle the charging of allocations for time used on the cluster.

The original Deepthought HPC cluster at the University of Maryland originally used the Maui scheduler for scheduling jobs, along with the Torque Resource Manager and the Gold Allocation Manager.
In 2009, we migrated to the Moab scheduler, still keeping Torque as our resource manager and Gold for allocation management.Moab derived from Maui, and so the user interface was mostly unchanged during this migration.
Slurm includes its own resource management and accounting system, so Torque and Gold are no longer used.

http://hpcc.umd.edu/hpcc/help/slurm-vs-moab.html

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