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RS/6000 SP and Clustered IBM
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pSeries Systems Handbook
9.3 LoadLeveler
Program number - 5765-D61
IBM LoadLeveler is a job management system that allows users to run more jobs
in less time by matching the jobs’ processing needs with the available resources.
LoadLeveler schedules jobs, and provides functions for building, submitting, and
processing jobs quickly and efficiently in a dynamic environment. It balances
your workload, efficiently manages job flow in the network, and distributes work
across all LoadLeveler-defined hardware resources. LoadLeveler is an
application that runs as a set of daemons on each node in the network.
Advantages
It offers a a single point of control for administration, job management and
workload scheduling.
LoadLeveler give users full scalability across processors and jobs.
It comes with APIs to enable alternate scheduling algorithms.
It supports thousands of jobs across hundreds of SP nodes and IBM
workstations.
It provides automatic recovery of central scheduler and can be configured
with HACMP for node and network failover.
9.3.1 Administration
From a system management perspective, LoadLeveler allows a system
administrator to control all jobs running in a cluster including the SP system.
Thus, providing administrators with the information needed to make adjustments
to job classes and changes to LoadLeveler-controlled resources.
LoadLeveler has a command line interface and a Motif-based graphical user
interface (GUI) making it easy to submit and cancel jobs, monitor job status,
and set and change job priorities. The system can be configured at the
network and node levels, where workstations or SP nodes may be identified
as job submitters, compute servers, or both.
LoadLeveler offers the option of using its own scheduler or an alternative
scheduler, such as EASY from the Cornell Theory Center. The product also
provides a user- or system-initiated checkpoint/restart capability for certain types
of FORTRAN, C, or C++ jobs linked to the LoadLeveler libraries.
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