A dynamic processor allocation policy for multiprogrammed, shared memory multiprocessors:

Abstract: "We propose and evaluate empirically the performance of a dynamic processor scheduling policy for multiprogrammed, shared memory multiprocessors. The policy is dynamic in that it reallocates processors from one parallel job to another based on the currently realized parallelism of tho...

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Hauptverfasser: MacCann, Cathy (VerfasserIn), Vaswani, Raj (VerfasserIn), Zahorjan, John (VerfasserIn)
Format: Buch
Sprache:English
Veröffentlicht: Seattle, Wash. 1991
Schriftenreihe:University of Washington <Seattle, Wash.> / Department of Computer Science: Technical report 90,3,2
Schlagworte:
Zusammenfassung:Abstract: "We propose and evaluate empirically the performance of a dynamic processor scheduling policy for multiprogrammed, shared memory multiprocessors. The policy is dynamic in that it reallocates processors from one parallel job to another based on the currently realized parallelism of those jobs. The policy is suitable for implementation in production systems in that: - it interacts well with very efficient user- level thread packages, leaving to them many low level thread operations that do not require kernel intervention. - it deals with thread blocking due to user I/O and page faults. - it ensures fairness in delivering resources to jobs
- its performance, measured in terms of average job response time, is superior to that of previously proposed schedulers, including those implemented in existing systems. - it provides good performance to very short, sequential (e.g., interactive) requests. We have evaluated our scheduler and compared it to alternatives using a set of prototype implementations running on a Sequent Symmetry multiprocessor
Using a number of parallel applications with distinct qualitative behaviors, we have both evaluated the policies according to the major criterion of overall performance and examined a number of more general policy issues, including the advantage of 'space sharing' over 'time sharing' the processors of a multiprocessor, the importance of cooperation between the kernel and the application in reallocating processors between jobs, and the impact of scheduling policy on an application's cache behavior. We have also compared the policies according to other criteria important in real implementations: fairness, resiliency to countermeasures, and response time to short, sequential requests
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