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Message Posted: Mon, 13 Nov 2000 @ 15:11:07 GMT

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Subj:   Re: Experiences with the Priority Scheduler?
From:   Thomas F. Stanek

We didn't do much testing in the area of IO prioritization. There is a parameter that allows you to turn IO Prioritization on or off, but we didn't use it much. As I recall in conversations from Carrie, it was not going to have a significant affect on our type of workloads. On the systems that I have worked with, we have been far more CPU bound than IO bound, so it has not been a concern.

The ABS policy is very effective in containing workloads to a set limit of resources available. Your comments on "not wasting CPU" is appropriate. A possible alternative might be to consider the REL policy. It has a similar effect to ABS except the set limit is dynamically calculated. Therefore, if work in other Resource Partitions are not active, the workload in the REL policy performance group will be able to use a higher percentage of the system.

Regarding the IO Priority tests by Wayne, could you elaborate a bit more on your tests? I'd be very interested in understanding what your test results were.

Tom Stanek
TFS Consulting

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