The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 2010
Filed:
May. 22, 2008
Wim DE Pauw, Scarborough, NY (US);
Donald P. Pazel, Montrose, NY (US);
Wim De Pauw, Scarborough, NY (US);
Donald P. Pazel, Montrose, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Methods and apparatus are provided for non-deterministic incremental program replay using checkpoints and syndrome tracking. Replay of a program proceeds by, for a given execution of the program, recording one or more checkpoints of the program, the one or more checkpoints containing program state information; and a recorded list of values for one or more identified variables executing in one or more threads of the program. Thereafter, during a replay execution of the program, the process continues by commencing execution from a particular one of the recorded checkpoints; restoring the program state information associated with the particular one of the recorded checkpoints; comparing an observed list of values to the recorded list of values for the one or more identified variables executing in each of the one or more threads; and identifying a difference between the observed list of values and the recorded list of values. A perturbation or suspend statement can optionally be introduced into the replay execution of the program.