摘要:
A method and system of copying memory from a source processor to a target processor by duplicating memory writes. At least some of the exemplary embodiments may be a method comprising stopping execution of a user program on a target processor (the target processor coupled to a first memory), continuing to execute a duplicate copy of the user program on a source processor (the source processor coupled to a second memory and generating writes to the second memory), duplicating memory writes of the source processor and duplicating writes by input/output adapters to create a stream of duplicate memory writes, and applying the duplicated memory writes to the first memory.
摘要:
A method and system of loosely lock-stepped non-deterministic processors. Some exemplary embodiments may be a processor-based method comprising executing fault tolerant copies of a user program, one copy of the user program executed in a first processor performing non-deterministic execution, and a duplicate copy of the user program executing in a second processor performing non-deterministic execution, with the executing in the first processor and second processor not in cycle-by-cycle lock-stepped.
摘要:
In a redundant-processor computing device, an error handling method comprises detecting equivalent disparity among processor elements of the computing device operating and responding to the detected equivalent disparity by evaluating secondary considerations of processor fidelity.
摘要:
A method and system of copying a memory area between processor elements for lock-step execution. At least some of the illustrative embodiments may be a method comprising executing duplicate copies of a first program in a first processor of a first multiprocessor computer system and in a first processor of a second multiprocessor computer system (the executing substantially in lock-step), executing a second program in a second processor element of the first multiprocessor computer system (the first and second processors of the first multiprocessor computer system sharing an input/output (I/O) bridge), copying a memory area of the second program executing in the second processor element of the first multiprocessor computer system to a memory of a second processor element in the second multiprocessor computer system while the duplicate copies of the first program are executing in the first processor elements, and then executing duplicate copies of the second program in the second processors in lock-step.
摘要:
Method and system of determining whether a user program has made a system level call and thus whether the user program is uncooperative with fault tolerant operation. Some exemplary embodiments may be a processor-based method comprising providing information from a first processor to a second processor (the information indicating that a user program executed on the first processor has not made a system level call in a predetermined amount of time), and determining by the first processor, using information from the second processor, whether a duplicate copy of the user program substantially simultaneously executed in the second processor has made a system level call in the predetermined amount of time.
摘要:
A method and system of servicing asynchronous interrupts in multiple processors executing a user program. Some of the exemplary embodiments may be a method comprising executing a user program on a first processor and a duplicate copy of the user program on a second processor, receiving an asynchronous interrupt by both the first and second processors, executing an interrupt service routine on the first processor at an agreed system call of the user program executed on the first processor, and executing an interrupt service routine on the second processor at the agreed system call of the user program executed on the second processor.
摘要:
A method and system of exchanging information between processors. At least some of the illustrative embodiments may be a method comprising exchanging information between a plurality of processors by writing (by a first processor) a first datum to a logic device and then continuing processing of a user program by the first processor, writing (by a second processor) a second datum to the logic device and then continuing processing of a user program by the second processor, and writing (by the logic device) the first and second datum to each of the first and second processors after all the processors have written their respective datum to the logic device.
摘要:
A method and system collects diagnostic data for use in diagnosing existing and potential image quality issues related to a printer. Document cover sheets and/or electronic versions of the cover sheets are routinely collected, even when there has been no reported image quality issue, to preserve a historical record of the output of the printer over an extended time period. The historical record of the images on the routinely collected cover sheets and/or electronic versions of the cover sheets include data useful in diagnosing existing and potential image quality issues related to substantive pages of the documents processed by the printer.