1. Robert P. Dick, Ganesh Lakshminarayana, Anand Raghunathan, and Niraj K. Jha Design Automation Conference, 2000 Reporter: Keng-Mao Cho Advisor: Prof. Chu-Sing Yang Date: 2010/12/02 2014/2/131

2. Introduction TCP/IP Subsystem Example Anti-Lock Braking Example Energy Analysis Infrastructure Results Conclusions 2014/2/132

3. Despite the widespread use of, and significant role played by, RTOSs in mobile and low-power embedded systems, little is known about their power consumption characteristics. This work presents the power profiles for a commercial RTOS, μC/OS, running several applications on an embedded system based on the Fujitsu SPARClite processor. An RTOS provides a number of services to an embedded system designer. Task management Resource management Interrupt Device deiver … 2014/2/133

4. Energy consumption information is generally more useful, when optimizing an embedded systemss battery lifespan, than power consumption information. This work focuses on understanding and characterizing the power effects of system software rather than on building a new systemlevel power analysis tool. The authors demonstrate that the RTOS itself can consume a significant amount of power. 2014/2/134

5. 5 A straightforward implementation of the TCP subsystem.

6. 2014/2/136 A multi-process implementation of the TCP subsystem.

7. 2014/2/137 An energy optimized implementation of the ABS example.

8. 2014/2/138 A straightforward implementation of the ABS example.

9. 2014/2/139

10. 10 Energy consumption profiles.

11. 2014/2/1311 Time consumption profiles.

12. By analyzing a commercial RTOS, μC/OS, running several applications, the authors have demonstrated that the manner in which the RTOS is used has a significant impact on an embedded systems power consumption. Insights derived from RTOS power analysis were used to optimize embedded software power consumption. 2014/2/1312

13. Robert P. Dick, Ganesh Lakshminarayana, Anand Raghunathan, and Niraj K. Jha, Power Analysis of Embedded Operating Systems, Design Automation Conference, 2000. V. Tiwari, S. Malik, and A.Wolfe, Power analysis of embedded software: A first step towards software power minimization, IEEE Trans.VLSI Systems, vol. 2, pp. 437–445, Dec. 1994. 2014/2/1313

14. Thank you! 2014/2/1314