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:
Jun. 10, 2014
Filed:
Jan. 18, 2011
Daniel Ahn, Yorktown Heights, NY (US);
Luis H. Ceze, Urbana, IL (US);
Alan Gara, Mount Kisco, NY (US);
Martin Ohmacht, Yorktown Heights, NY (US);
Zhuang Xiaotong, White Plains, NY (US);
Daniel Ahn, Yorktown Heights, NY (US);
Luis H. Ceze, Urbana, IL (US);
Alan Gara, Mount Kisco, NY (US);
Martin Ohmacht, Yorktown Heights, NY (US);
Zhuang Xiaotong, White Plains, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a parallel processing system with speculative execution, conflict checking occurs in a directory lookup of a cache memory that is shared by all processors. In each case, the same physical memory address will map to the same set of that cache, no matter which processor originated that access. The directory includes a dynamic reader set encoding, indicating what speculative threads have read a particular line. This reader set encoding is used in conflict checking. A bitset encoding is used to specify particular threads that have read the line.