Methods of debugging multiprocessor system

Details Methods of debugging multiprocessor system Methods of debugging multiprocessor system

1991-11-18

1995-09-19

Atkinson, Charles E.

Boots, shoes, and leggings

36426791, 3642755, 364DIG1, 395800, 39518309, 3951831, G06F 1100

Patent

active

054524377

ABSTRACT:
In a data processing system comprising a plurality of processing elements coupled to a network, a method of single-stepping the processing elements aids in debugging the system. Only one processing element at a time is permitted to execute N steps while its data output is coupled to the network. Once it's finished executing, a time period greater than the maximum propagation delay time of the network is permitted to pass before stepping a succeeding processing element N steps. In another embodiment, the outputs of all processing elements to the network are first disabled, then all processing elements are allowed to execute N steps. Next the system is halted, and, one at a time, the data output of each processing element is coupled to the network, allowing sufficient time for each processing element's output to propagate through the network before coupling the output of a succeeding processing element.

REFERENCES:
patent: 4181940 (1980-01-01), Underwood et al.
patent: 4502116 (1985-02-01), Fowler et al.

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