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:
Jul. 06, 2010
Filed:
Nov. 13, 2008
Paul Del Vigna, Jr., San Jose, CA (US);
Robert L. Jardine, Cupertino, CA (US);
Paul Del Vigna, Jr., San Jose, CA (US);
Robert L. Jardine, Cupertino, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
Aligning execution point of duplicate copies of a user program by exchanging information about instructions executed. At least some of the exemplary embodiments may be a method of operating duplicate copies of a user program in a first and second processor, allowing at least one of the user programs to execute until retired instruction counter values in each processor are substantially the same, and then executing a number of instructions of each user program. Of the instructions executed, at least some of the instructions are decoded and the inputs of each decoded instruction determined (the decoding substantially simultaneously with executing in each processor). The method further may include exchanging among the processors addresses of decoded instructions and values indicative of inputs of the decoded instructions, determining that an execution point of the user program in the first processor lags with respect to an execution point of the user program in the second processor using at least the addresses of the decoded instructions, and advancing the first processor until the execution point within each user program is substantially aligned.