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Task Management
Note that one can still have (and generally does) non time-critical tasks in a system and thus
use close to 100 percent of the CPU’s time. However, using 100 percent of your CPU’s time
is not a desirable goal as it does not allow for code changes and added features. As a rule of
thumb, always design a system to use less than 60 to 70 percent of the CPU.
RMS says that the highest rate task has the highest priority. In some cases, the highest rate
task might not be the most important task. The application dictates how to assign priorities.
However, RMS is an interesting starting point.
1
2
3
4
5
:
:
:
Infinite
Number of Tasks
n(2 1/n -1)
1.00
0.828
0.779
0.756
0.743
:
:
:
0.693
Table 5-1 Allowable CPU usage based on number of tasks
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