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100% 100%

CPU CPU
0% 0%
100% 100%

Memory Memory
0% 0%
100% 100%

Disk Disk

0% 0%
100% 100%

Terminal Terminal
0% 0%
100% 100%

Printer Printer

0% 0%
Job History Job History JOB1
JOB1 JOB2 JOB3
JOB2
0 5 10 15 20 25 30
minutes JOB3
0 5 10 15
time
minutes
time
(a) Uniprogramming (b) Multiprogramming

Figure 2.6 Utilization Histograms