Patents by Inventor Daniel Ahn

Daniel Ahn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Multiprocessor system with multiple concurrent modes of execution
    Patent number: 9501333
    Abstract: A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: November 22, 2016
    Assignee: International Business Machines Corporation
    Inventors: Daniel Ahn, Luis H. Ceze, Dong Chen Chen, Alan Gara, Philip Heidelberger, Martin Ohmacht
  • MULTIPROCESSOR SYSTEM WITH MULTIPLE CONCURRENT MODES OF EXECUTION
    Publication number: 20140207987
    Abstract: A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.
    Type: Application
    Filed: December 30, 2013
    Publication date: July 24, 2014
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Daniel Ahn, Luis H. Ceze, Dong Chen Chen, Alan Gara, Philip Heidelberger, Martin Ohmacht
  • Reader set encoding for directory of shared cache memory in multiprocessor system
    Patent number: 8751748
    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.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: June 10, 2014
    Assignee: International Business Machines Corporation
    Inventors: Daniel Ahn, Luis H. Ceze, Alan Gara, Martin Ohmacht, Zhuang Xiaotong
  • Multiprocessor system with multiple concurrent modes of execution
    Patent number: 8621478
    Abstract: A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: December 31, 2013
    Assignee: International Business Machines Corporation
    Inventors: Daniel Ahn, Luis H. Ceze, Dong Chen, Alan Gara, Philip Heidelberger, Martin Ohmacht
  • MULTIPROCESSOR SYSTEM WITH MULTIPLE CONCURRENT MODES OF EXECUTION
    Publication number: 20110219381
    Abstract: A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.
    Type: Application
    Filed: January 18, 2011
    Publication date: September 8, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Daniel Ahn, Luis H. Ceze, Dong Chen, Alan Gara, Philip Heidelberger, Martin Ohmacht
  • READER SET ENCODING FOR DIRECTORY OF SHARED CACHE MEMORY IN MULTIPROCESSOR SYSTEM
    Publication number: 20110219191
    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.
    Type: Application
    Filed: January 18, 2011
    Publication date: September 8, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Daniel Ahn, Luis H. Ceze, Alan Gara, Martin Ohmacht, Zhuang Xiaotong