Automatic logical CPU assignment of physical CPUs

Details Automatic logical CPU assignment of physical CPUs Automatic logical CPU assignment of physical CPUs

1992-10-02

1995-04-18

Beausoliel, Jr., Robert W.

Excavating

371 161, G06F 1100

Patent

active

054086477

ABSTRACT:
A multiprocessor computer system includes fault tolerant power up logic for finding a functioning CPU to operate as logical CPU0. Each microprocessor has a physical location designation which remains constant. When the system is powered up, all of the CPUs except the CPU in physical slot 0 (CPU P0) are initially placed in an inactive sleep state. The microprocessor in physical location 0 performs its power on self test (POST), and if the CPU functions properly, the CPU is designated as logical CPU0 (CPU L0). The microprocessor then awakens the remaining CPUs and boots up the rest of the computer system. If CPU P0 is not functioning properly, after a given time period the system awakens the processor in the next physical location and repeats the process of testing the CPU. The process repeats until an operating microprocessor is found to perform the CPU L0 functions.

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Start-Up Master Processor Selection Method for Multi-Processory Systems, IBM Technical Disclosure Bulletin, vol. 33, No. 4, Sep. 1990, pp. 375-376.

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