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The VM/370 Resource Limiter

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2 Author(s)
D. M. Chess ; IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598, USA ; G. Waldbaum

RESLIM has proved to be a useful workload management tool for users, user management, and computing center personnel. On a daily basis, RESLIM discovers about ten undesired program loops and automatically reduces the performance impact of these loops by degrading the offending virtual machine's priority. This saves hours of processing time yet preserves the faulty state of the users' virtual machines to facilitate on-line debugging. The most notable feature of RESLIM is its unique position in the resource allocation hierarchy. It is more specific in function and more easily modified than the VM scheduler and yet makes possible a degree of automation that can free management from the responsibility of directly watching over the system andta king action manually. While it is likely that certain of RESLIM'S functions could be performed by a sufficiently sophisticated scheduler, it is also clear that the ease with which management can alter its functional parameters stems directly from its implementation as a separate virtual machine. And in an environment which is heavily resource-constrained, the ability to make prompt, specific changes in the allocation and control of those resources can be a great advantage.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Systems Journal  (Volume:20 ,  Issue: 4 )