Method of automatically controlling the allocation of resources of a parallel processor computer system by calculating a minimum execution time of a task and scheduling subtasks against resources to execute the task in the minimum time
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United States of America Patent
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Jun 28, 1994
Grant Date -
N/A
app pub date -
Apr 4, 1991
filing date -
Apr 4, 1991
priority date (Note) -
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Abstract
A method of controlling the allocation of resources in a parallel processor computer. A critical path for executing a task such as evaluating a database query is determined. The minimum time to execute the task assuming infinite resources such as processors and memory buffers is calculated. Resources are scheduled against subtasks so as to execute the task in the calculated minimum time. The number of resources would be required to meet the schedule is determined and if the computer has that many resources the schedule is carried out. Otherwise a revised execution time is calculated, preferably by using as a scaling factor the ratio between the number of required resources and the number of available resources. Then the schedule is adjusted so that the task can be executed in the revised time and the number of resources that would be required to meet the adjusted schedule is determined. If the computer has that many resources the schedule is carried out, otherwise the process is repeated. Preferably the process is halted if two iterations result in the same number of resources being needed.
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