Search Patents
  • Publication number: 20030018459
    Abstract: An improved method for debugging of analog and mixed signal behavioral models during simulation using Newton-Raphson iteration replay. The method according to the invention has substantially modified the prior art solution by limiting the interactive debugging steps in a replay of the last iteration of the accepted timepoints. Using this method, the user only interacts with the simulation during the iteration replay, and only for the accepted solution points. If the user is single stepping through this simulation, the simulator enters interactive mode at each statement during the replay. Similarly, if not single stepping, but a breakpoint has been triggered, the simulator enters the interactive mode at the appropriate statement to honor the breakpoint. While the iteration replay is performed, the system of equations does not need to be solved again. Instead, the solution vector is reinstated from the known solution of the last iteration.
    Type: Application
    Filed: June 20, 2001
    Publication date: January 23, 2003
    Inventors: Donald J. O' Riordan, Richard Trihy
  • Patent number: 7085700
    Abstract: An improved method for debugging of analog and mixed signal behavioral models during simulation using Newton-Raphson iteration replay. The method according to the invention has substantially modified the prior art solution by limiting the interactive debugging steps in a replay of the last iteration of the accepted timepoints. Using this method, the user only interacts with the simulation during the iteration replay, and only for the accepted solution points. If the user is single stepping through this simulation, the simulator enters interactive mode at each statement during the replay. Similarly, if not single stepping, but a breakpoint has been triggered, the simulator enters the interactive mode at the appropriate statement to honor the breakpoint. While the iteration replay is performed, the system of equations does not need to be solved again. Instead, the solution vector is reinstated from the known solution of the last iteration.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: August 1, 2006
    Assignee: Cadence Design Systems, Inc.
    Inventors: Donald J. O'Riordan, Richard Trihy
  • Publication number: 20110078666
    Abstract: Provided are a system and method for precisely reproducing a device program execution, such as reproducing a software program executed on a computer for example. The method provides a solution to a class of diagnosis methods known as “record/replay” or “deterministic replay”, where information related to a program execution is recorded for later replay, often for diagnostic purposes to reproduce errors in device function such as software bugs and other anomalous behavior.
    Type: Application
    Filed: May 26, 2010
    Publication date: March 31, 2011
    Applicant: University of California
    Inventor: Gautam Altekar
  • Patent number: 7506318
    Abstract: A method is disclosed for recording and replaying computer programs. In one embodiment, a method of modifying a computer program to support recording execution, comprises the computer-implemented steps of receiving an executable application binary; modifying the executable application binary by adding one or more proxy code elements to result in creating a modified application binary, wherein upon execution of the modified application binary, the one or more proxy code elements create and store recorded information representing all non-deterministic events that occur during the execution. For example, asynchronous callbacks and thread context switches are recorded and can be replayed.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: March 17, 2009
    Assignee: Replay Solutions, Inc.
    Inventors: Jonathan Lindo, Jeffrey Daudel
  • Patent number: 7958497
    Abstract: Recording and replaying computer programs includes state synchronization and thread management techniques that facilitate accurately replaying the recorded execution of a multithreaded application program. State synchronization comprises, during execution of an application program in a computer system, detecting an operation of the application program to write a memory; preventing the operation to write the memory; storing a representation of the memory; permitting the operation to write the memory, resulting in written memory; comparing the written memory to the stored representation; and in response to determining that the written memory is different than the stored representation, generating a notification that a memory state synchronization exception occurred.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: June 7, 2011
    Assignee: Replay Solutions, Inc.
    Inventors: Jonathan Lindo, Jeffrey Daudel
  • Patent number: 7673181
    Abstract: Recording and replaying computer programs includes detecting whether a race condition exists among multiple threads of a multithreaded application program. In an embodiment, detecting race conditions comprises detecting and preventing an operation of a first thread of an application program to read or write a computer memory, wherein the application program executes a plurality of threads; storing an exception point representing a current location in an execution path of the application program; allowing the operation to read or write the memory; creating and storing a record identifying the memory, the first thread, and an index value for a location in the execution path; and determining, based on the record and a plurality of other similar records, whether a race condition exists at the exception point for the first thread and one or more other threads in the plurality of the threads.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: March 2, 2010
    Assignee: Replay Solutions, Inc.
    Inventors: Jonathan Lindo, Jeffrey Daudel
  • Patent number: 8079019
    Abstract: In an embodiment, a data processing system comprises a storage system coupled to a unit under test comprising a heap memory, a static memory and a stack; second logic operable to perform: detecting one or more changes in a first state of the heap memory and the static memory; storing, in the storage system, as a state point of the unit under test, the one or more changes in the first state of the heap memory and the static memory; third logic operable to perform: receiving a request to change the memory under test to a particular state point; in response to the request, loading the particular state point from the storage system and applying the state point to the heap memory and the static memory to result in changing the heap memory and the static memory to a second state that is substantially equivalent to the first state.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: December 13, 2011
    Assignee: Replay Solutions, Inc.
    Inventors: Jonathan Lindo, Jeffrey Daudel, Arpad Jakab, Suman Cherukuri
  • Publication number: 20140193134
    Abstract: [Problem] In a system that transmits content data from a content replay device to a content output device, to prevent a deterioration in audio quality or video data picture quality while being able to increase the simplicity of a setting-altering operation without requiring complicated signal processing.
    Type: Application
    Filed: July 27, 2012
    Publication date: July 10, 2014
    Applicant: D&M Holdings, Inc.
    Inventors: Koji Maeda, Masaichi Yoshida, Yuji Ota
  • Patent number: 9154726
    Abstract: [Problem] In a system that transmits content data from a content replay device to a content output device, to prevent a deterioration in audio quality or video data picture quality while being able to increase the simplicity of a setting-altering operation without requiring complicated signal processing.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: October 6, 2015
    Assignee: D&M Holdings, Inc.
    Inventors: Koji Maeda, Masaichi Yoshida, Yuji Ota
  • Publication number: 20140208109
    Abstract: A method and system to provide an effective, scalable and yet low-cost solution for Confidentiality, Integrity and Replay protection for sensitive information stored in a memory and prevent an attacker from observing and/or modifying the state of the system. In one embodiment of the invention, the system has strong hardware protection for its memory contents via XTS-tweak mode of encryption where the tweak is derived based on “Global and Local Counters”. This scheme offers to enable die-area efficient Replay protection for any sized memory by allowing multiple counter levels and facilitates using small counter-sizes to derive the “tweak” used in the XTS encryption without sacrificing cryptographic strength.
    Type: Application
    Filed: December 28, 2011
    Publication date: July 24, 2014
    Inventors: Alpa T. Narendra Trivedi, David M. Durham, Men Long, Siddhartha Chhabra, Uday R. Savagaonkar, Carlos V. Rozas
  • Patent number: 9092644
    Abstract: A method and system to provide an effective, scalable and yet low-cost solution for Confidentiality, Integrity and Replay protection for sensitive information stored in a memory and prevent an attacker from observing and/or modifying the state of the system. In one embodiment of the invention, the system has strong hardware protection for its memory contents via XTS-tweak mode of encryption where the tweak is derived based on “Global and Local Counters”. This scheme offers to enable die-area efficient Replay protection for any sized memory by allowing multiple counter levels and facilitates using small counter-sizes to derive the “tweak” used in the XTS encryption without sacrificing cryptographic strength.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: July 28, 2015
    Assignee: Intel Corporation
    Inventors: Alpa T. Narendra Trivedi, David M. Durham, Men Long, Siddhartha Chhabra, Uday R. Savagaonkar, Carlos V. Rozas
  • Publication number: 20120176173
    Abstract: Adaptive scaling digital techniques attempt to place the system close to the timing failure so as to maximize energy efficiency. Rapid recovery from potential failures is usually by slowing the system clock and/or providing razor solutions (instruction replay.) These techniques compromise the throughput. We present a technique to provide local in-situ fault resilience based on dynamic slack borrowing. This technique is non-intrusive (needs no architecture modification) and has minimal impact on throughput.
    Type: Application
    Filed: June 30, 2011
    Publication date: July 12, 2012
    Applicants: STMICROELECTRONICS SA, STMicroelectronics Pvt Ltd.
    Inventors: Chittoor PARTHASARATHY, Nitin Chawla, Kallol Chatterjee, Pascal Urard
  • Publication number: 20140035644
    Abstract: Adaptive scaling digital techniques attempt to place the system close to the timing failure so as to maximize energy efficiency. Rapid recovery from potential failures is usually by slowing the system clock and/or providing razor solutions (instruction replay.) These techniques compromise the throughput. This application presents a technique to provide local in-situ fault resilience based on dynamic slack borrowing. This technique is non-intrusive (needs no architecture modification) and has minimal impact on throughput.
    Type: Application
    Filed: October 3, 2013
    Publication date: February 6, 2014
    Applicants: STMicroelectronics SA, STMicroelectronics International N.V.
    Inventors: Chittoor PARTHASARATHY, Nitin CHAWLA, Kallol CHATTERJEE, Pascal URARD
  • Patent number: 8552765
    Abstract: Adaptive scaling digital techniques attempt to place the system close to the timing failure so as to maximize energy efficiency. Rapid recovery from potential failures is usually by slowing the system clock and/or providing razor solutions (instruction replay.) These techniques compromise the throughput. We present a technique to provide local in-situ fault resilience based on dynamic slack borrowing. This technique is non-intrusive (needs no architecture modification) and has minimal impact on throughput.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: October 8, 2013
    Assignees: STMicroelectronics International N.V., STMicroelectronics SA
    Inventors: Chittoor Parthasarathy, Nitin Chawla, Kallol Chatterjee, Pascal Urard
  • Patent number: 8994416
    Abstract: Adaptive scaling digital techniques attempt to place the system close to the timing failure so as to maximize energy efficiency. Rapid recovery from potential failures is usually by slowing the system clock and/or providing razor solutions (instruction replay.) These techniques compromise the throughput. This application presents a technique to provide local in-situ fault resilience based on dynamic slack borrowing. This technique is non-intrusive (needs no architecture modification) and has minimal impact on throughput.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: March 31, 2015
    Assignees: STMicroelectronics International N.V., STMicroelectronics SA
    Inventors: Chittoor Parthasarathy, Nitin Chawla, Kallol Chatterjee, Pascal Urard
  • Publication number: 20120005175
    Abstract: A method to continuously replay Production Database Workload in near real time using workload capture based on Network or Kernel Capture is provided. The capture of the Server workload is done using Network Capture or using Kernel drivers in a continuous round robin method. The captured data is continuously pre-processed followed by a continuous replay of that data to a Test database system, with the replay lagging the original workload by a fixed initial time delay.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 5, 2012
    Applicant: EXACT SOLUTIONS, INC.
    Inventor: Krishna VORA
  • Publication number: 20130254877
    Abstract: Managing access to resources shared among multiple processes within a computer system. Multiple program instances of an application are almost simultaneously executed on multiple processors for fault tolerance. The replication solution supports the recording and subsequent replay of reservation events granting the shared resources exclusive access rights to the processes, when one program code instruction may request access to a set of shared resources in a non-deterministic order.
    Type: Application
    Filed: May 22, 2013
    Publication date: September 26, 2013
    Applicant: International Business Machines Corporation
    Inventors: Philippe Bergheaud, Reinhard Buendgen, Martin Schwidefsky
  • Patent number: 8490181
    Abstract: Managing access to resources shared among multiple processes within a computer system. Multiple program instances of an application are almost simultaneously executed on multiple processors for fault tolerance. The replication solution supports the recording and subsequent replay of reservation events granting the shared resources exclusive access rights to the processes, when one program code instruction may request access to a set of shared resources in a non-deterministic order.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: July 16, 2013
    Assignee: International Business Machines Corporation
    Inventors: Philippe Bergheaud, Reinhard Buendgen, Martin Schwidefsky
  • Publication number: 20100275260
    Abstract: Managing access to resources shared among multiple processes within a computer system. Multiple program instances of an application are almost simultaneously executed on multiple processors for fault tolerance. The replication solution supports the recording and subsequent replay of reservation events granting the shared resources exclusive access rights to the processes, when one program code instruction may request access to a set of shared resources in a non-deterministic order.
    Type: Application
    Filed: March 26, 2010
    Publication date: October 28, 2010
    Applicant: International Business Machines Corporation
    Inventors: Philippe Bergheaud, Reinhard Buendgen, Martin Schwidefsky
  • Patent number: 8978131
    Abstract: Managing access to resources shared among multiple processes within a computer system. Multiple program instances of an application are almost simultaneously executed on multiple processors for fault tolerance. The replication solution supports the recording and subsequent replay of reservation events granting the shared resources exclusive access rights to the processes, when one program code instruction may request access to a set of shared resources in a non-deterministic order.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: March 10, 2015
    Assignee: International Business Machines Corporation
    Inventors: Philippe Bergheaud, Reinhard Buendgen, Martin Schwidefsky
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