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Information processor

An information processing equipment and signal technology, applied in the direction of electrical digital data processing, memory address/allocation/relocation, instruments, etc., can solve the problem of time increase

Inactive Publication Date: 2006-08-09
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, as the size of the memory in the computer module increases, the time to copy the entire contents of the memory in the computer module also increases

Method used

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Embodiment Construction

[0015] As described in the background, the causes of computer modules being out of consistent synchronization are permanent or non-permanent failures. In a fault-tolerant computer, a computer module in which a permanent failure has occurred must be replaced. On the other hand, if a computer module is out of consistent synchronization due to a non-permanent failure, it is usually not replaced but rejoined without any changes. That is, in quite a few cases, instead of replacing a computer module that is out of consistent synchronization, it is installed without any changes. The data stored in the memory of a computer module out of consistent synchronization may differ from the data stored in the memory of a computer module in consistent synchronization, whereas if no failure is detected, the memory of the computer module will store the same data. In many cases, the difference is small or limited.

[0016] Embodiments of the present invention will be described in detail below. ...

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Abstract

An information processing apparatus of the present invention includes first and second computer elements which execute the same instructions substantially simultaneously in substantial synchronism and which have first and second memory elements, respectively. The information processing apparatus has a copy element which copies a part of the data stored in the second memory element to the first memory element and a third memory element which stores information to designate which part of the data stored in the second memory element is copied by the copy element when a monitor element finds that the first computer element is out of the synchronism. Each of the first and second computer elements further has a processor and a bus connected to the processor, in another information processing apparatus of the present invention, and the monitor element is further connected to the bus.

Description

technical field [0001] The present invention relates to an information processing device, such as a lockstep fault tolerant computer, which simultaneously processes the same instructions in a plurality of clock-synchronized computer modules, and more particularly to an information processing device, The information handling device rapidly synchronizes the computer module with the other computer modules that have become out of synchronization and isolated from operation. Background technique [0002] Traditional step-by-step fault-tolerant computers have multiple computer modules that execute the same instructions simultaneously. In a fault-tolerant computer, one of the computer modules may operate differently from the other computer modules due to a failure or some other reason. When a computer module is detected that is operating differently from other computer modules, in other words, when a computer module that is out of lockstep synchrony is found, a step-by-step fault-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/00G06F12/08G06F11/07G06F11/16G06F11/18G06F11/30G06F15/16G06F15/177
CPCG06F11/1658G06F11/0712G06F11/0724G06F11/0751G06F11/0772G06F11/00
Inventor 爱野茂幸山崎茂雄
Owner NEC CORP
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