Page 106 - DCAP608_REAL TIME SYSTEMS

Unit 10: Working of Clock-driven Scheduling

Notes
Figure 3: Block and Timing Diagrams of Conventional Clock Gating

Questions:

1. How many parallel and non-parallel pipelines are used in FPU?
2. Define the term stacked bar graph.
3. What is meant by FPU power dissipation breakdowns?

Source: http://www.eecs.harvard.edu/~dbrooks/wei_islped08.pdf 10.3

10.3 Summary

 In clock driven scheduling, a schedule of jobs is computed off-line.
 All scheduling decisions are made a priori.

 In clock driven scheduling, schedule is static, finite but generally is applied cyclically.
 The run-time scheduler is driven by a hardware timer and simply follows this schedule.
 There is minimal runtime overhead. Behaviour is completely predictable and some
variation can be accommodated using multiple tables which apply to different operational
modes of the system.
 The sooner the aperiodic jobs complete, the more responsive the system is.

 Like jobs in periodic tasks, sporadic jobs have hard deadlines.

LOVELY PROFESSIONAL UNIVERSITY 101