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Condor-a hunter of idle workstations

by: MJ Litzkow, M Livny, MW Mutka
Distributed Computing Systems, 1988., 8th International Conference on (1988), pp. 104-111.


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The design, implementation, and performance of the Condor scheduling system, which operates in a workstation environment, are presented. The system aims to maximize the utilization of workstations with as little interference as possible between the jobs it schedules and the activities of the people who own workstations. It identifies idle workstations and schedules background jobs on them. When the owner of a workstation resumes activity at a station, Condor checkpoints the remote job running on the station and transfers it to another workstation. The system guarantees that the job will eventually complete, and that very little, if any, work will be performed more than once. A performance profile of the system is presented that is based on data accumulated from 23 stations during one month. During the one-month period, nearly 1000 jobs were scheduled by Condor. The system was used by heavy users and light users who consumed approximately 200 CPU days. An analysis of the response times observed by the different users is a clear display of the ability of Condor to protect the rights of light users against heavy users who try to monopolize all free capacity. Since a user of Condor has to devote some local capacity to support the remote execution of his/herjobs, the effectiveness of the remote scheduling systemdepends on the amount of this capacity. We show that this overhead is very small. On the average, a user has to sacrifice less than one minute of local CPU capacity to acquire a day of remote CPU capacity. Condor has proven to be an extremely effective means to improve the productivity of our computing environment.


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