ENVS 1500 Chapter 18: ENVS 1500 Chapter 18 Notes

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ENVS 1500 Chapter 18 Notes Summary
Introduction
System Status Information
The user is not even aware of which application is executing at any given instant.
This technique views the document as the center of focus, instead of the applications
that are being executed.
As previously seen, most operating systems provide status information that can be
useful to a user who knows how to interpret the data.
This data is usually more important to the people who operate and maintain the
computer system
Sometimes status information can be useful to programmers and users in optimizing
their work.
Commands commonly exist to determine the amount of available disk space, the
amount of available memory, the number of users on the system and who they are, the
percentage of time that the CPU and I/O channels are busy, and many other statistics.
As an example of how this data might be useful, consider an application program that
does the billing for a large electric utility company.
Suh a poga ight euie ay hous of CPU tie to oplete a oth’s illig.
A small change in the program could cut the CPU time by a significant percentage.
The measurement of CPU time used is essential to assess the improvement.
This data might also be important to a user who is being billed for her time.
The names of other users on the system might be used to establish a phone-type
conference or to send a quick message to another user.
Many systems provide a logging facility that maintains a file of all keyboards and screen
I/O.
With a log file the user can determine at a later time what commands were typed and
what modifications made to programs and data.
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