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Examples of Time-Sharing
Three examples of GE-235 equipment configurations a r e shown below, with the relative amounts
of time consumed in each case by I/O activity and internal computation.
a
Example A
Read cards at 400 cards per minute
Read magnetic tape at 15,000 characters
per second (500-character record)
Print at 900 lines per minute (edited)
Total
Percent of total time left for computing: 96.9*
a
Example B
Read cards at 400 cards per minute
Mass random access data storage (read
and write cycle at 200 milliseconds)
Print at 900 lines per minute (edited)
Percent of Total Time
Total
Percent of total time left for computing: 98.6*
a
Example C
High-speed card reading at 850 cards per minute
.7
Read magnetic tape at 41,600 characters per
second (500-character record)
4.2
Write magnetic tape at 41,600 characters per
second (500-character record)
4.2
Print at 900 lines per minute (edited)
.7
Total
Percent of total time left for computing: 90.2*
*
Since execution of many instructions does not require access to memory, actual computing
time may range upward from the amount shown.
Overall Effect of Time-Sharing
The overall effect of the GE-235 time-sharing arrangement i s to create the most efficient balance
between I/O operations and internal computation, regardless of the type of application.
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