Non-intrinsive method and system for recovering the state of a c

Details Non-intrinsive method and system for recovering the state of a c Non-intrinsive method and system for recovering the state of a c

1993-07-01

1995-04-25

Beausoliel, Jr., Robert W.

Excavating

371 19, G06F 945

Patent

active

054106850

ABSTRACT:
A non-intrusive method and system for recovering the state of a computer system including a memory having first and second matched levels. The first level is connected to a target processor and the second level is connected to a checkpoint processor which is also connected to the target processor. In an example of the invention, a two phase, non-intrusive method and system for debugging parallel computer programs is provided. The program has checkpoint instructions therein. In the first phase the execution of the program is monitored non-intrusively from a bus connecting the target processor to the first level of memory. A sequence of relevant program instructions is stored in an event table. Upon encountering a checkpoint instruction, the target processor cues the checkpoint processor to initiate a non-intrusive checkpointing strategy utilizing the two-level memory with an E-bit scheme. In the second phase the information collected during the first phase is utilized to replay an identical execution of the program, in a simulated environment. A user, on encountering an error, can back up to a previous checkpoint and replay the program from that state of the computer system.

REFERENCES:
patent: 4164017 (1979-08-01), Randell et al.
patent: 5086502 (1992-02-01), Malcolm
patent: 5089958 (1992-02-01), Horton et al.
patent: 5103394 (1992-04-01), Blasciak
patent: 5142679 (1992-08-01), Owak et al.

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