SCore-D is a user-level parallel operating system providing a single system image for a cluster.

scored must be invoked in a scout(1) environment, and will run within the environment assuming the host group of the environment is a cluster. scored is also invoked implicitly when users run their parallel programs with the scrun(1) command. In this case, scored runs in single-user mode. scored runs in multi-user mode when invoked explicitly.

scored manages various cluster resources, such as processors and networks. Scheduling user jobs is one of the major tasks of scored. scored schedules user jobs in the "Time Space Sharing Scheduling" fashion, multiple user jobs can be multiplexed in time and space to obtain higher throughput, and shorter response time. Because of this scheduling strategy, users cannot specify where to run their jobs.

See the following sections for examples of SCore-D execution:

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