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Concurrency

Concurrency

Andy
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Concurrent execution can be at the instruction, statement, or subprogram level. Physical concurrency: when multiple processors are used to execute concurrent units. Logical concurrency: concurrent united are executed on a single processor. Two primary facilities to support subprogram concurrency: competition . synchronization and cooperation synchronization. Mechanisms: semaphores, monitors, rendezvous, threads. High-Performance Fortran provides statements for specifying how data is to be .distributed over the memory units connected to multiple processors.
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