Webopedia on Google+Webopedia on TwitterWebopedia on FacebookTech Bytes Blog
Main » TERM » L »

lockstep processor technique

A processor lockstep is a technique used to achieve high reliability in a microprocessor system. This is done by adding a second identical processor to a system that monitors and verifies the operation of the system processor.

* The two processors are initialized to the same state during system start-up, and they receive the same inputs (code, bus operations and asynchronous events), so during normal operation the state of the two processors is identical from clock to clock. They are said to be operating in lockstep. The lockstep technique assumes that an error in either processor will cause a difference between the states of the two processors, which will eventually be manifested as a difference in the outputs, so the lockstep system monitors the outputs of the two processors and flags an error in the case of a discrepancy. [* Adapted from IBM PowerPC Tips]







TECH RESOURCES FROM OUR PARTNERS
DID YOU KNOW?
It's Happening Now: Perceptual Computing is Real

Perceptual computing is the ability for a computer to recognize what is going on around it. More specifically, the computer can perceive the... Read More »

Apple Pay Promises to Strengthen Payment Security

Experts believe that Apple Pay and other competitive payment systems will be far more secure than cards, even cards equipped with EMV chips. Read More »

The Great Data Storage Debate: Is Tape Dead?

Tape clearly is on the decline. But remember, legacy systems can hang for a shockingly long time. Read More »

QUICK REFERENCE
Network Fundamentals Study Guide

A network is a group of two or more computer systems or devices, linked together to share resources, exchange files and electronic communications.... Read More »

Computer Architecture Study Guide

This Webopedia  study guide describes the different parts of a computer system and their relations. Read More »

Webopedia Polls

The trend for the past two years has been for shoppers to spend more online during the holiday season. How do you typically shop for holiday... Read More »