Information processing system capable of executing a single inst

Details Information processing system capable of executing a single inst Information processing system capable of executing a single inst

1991-01-18

1995-08-08

Bowler, Alyssa H.

Boots, shoes, and leggings

395550, 364271, 3642712, 364DIG1, G06F 1516

Patent

active

054407508

ABSTRACT:
Each processor of a multiprocessor system which shares a main storage has a execution circuit for executing a compare and watch instruction provided for watching information for synchronization written into a main storage. When one program being executed by one of the processors issues an instruction, the circuit fetches information for synchronization from a location within the main storage designated by the instruction, compares that fetched information with another information designated by the instruction. If they do not have a specific relation, the fetching and the comparison is repeated. The circuit has a circuit for limiting the repetition with a limited number of times. The circuit further has a circuit for counting a total amount of CPU time spent for execution of plural watching instructions issued by the same program.

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Paolo Carnevali et al., "Microtasking on IBM Multiprocessors", IBM J. Res. Develop. vol. 30, No. 4, Nov. 1986, pp. 574-582.

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