October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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274 Embedded systems design
file or command program. If the data file represents a command,
control is then passed to it, and the command executed.
The time taken to perform file access is inevitably depend-
ant on the speed of the hard disk and the time it takes to access each
individual block. If the blocks are consecutive or close to each
other, the total access time is much quicker than if they are
dispersed throughout the disk. Linux also uses mass storage as a
replacement for system memory by using memory management
techniques and its system response is therefore highly dependant
on hard disk performance. UNIX uses two techniques to help
improve ...