Relógio Virtual Estritamente Crescente para o Computador Raspberry Pi
Abstract
Wireless sensor network projects's require energy-efficient computing platforms such as the Raspberry Pi (RPI). To achieve this, a typical mechanism that such platforms support is the DVFS (Dynamic Voltage and Frequency Scale). However, the use of the DVFS mechanism can negatively impact the performance of the clock circuits of the RPI platform as a trade-off, to the energy efficiency it can provide. This paper proposes a virtual clock, RVEC, as a new solution that utilizes the cycle counter of the RPIs ARM processor while ensuring that the timekeeping is strictly-increasing and accurate. The RVEC solution also provides nanosecond time resolution with an access cost equivalent to that of system clocks.References
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Broadcom. BCM2835 ARM Peripherals.
Corrêa, E. C. (2014). Relógio Virtual Estritamente Crescente para o Computador Raspberry Pi. Master's thesis, COPPE/UFRJ.
de Souza, A. F., de Souza S. F., de Amorim, C. L., Lima, P., and Rounce, P. (2008). Hardware supported synchronization primitives for clusters. In PDPTA'08, pages 520–526.
Dutra, D., Whately, L., and Amorim, C. (2013). Attaining strictly increasing and precise time count in energy-efcient computer systems. In Computer Architecture and High Performance Computing (SBAC-PAD), 2013 25th International Symposium on, pages 65–72.
Fan, R., Chakraborty, I., and Lynch, N. (2004). Clock synchronization for wireless networks. In In Proc. 8th International Conference on Principles of Distributed Systems (OPODIS), pages 400–414.
Khan, J., Bilavarn, S., and Belleudy, C. (2012). Energy analysis of a dvfs based power strategy on arm platforms. In Faible Tension Faible Consommation (FTFC), 2012 IEEE, pages 1–4.
Mills, D. (1992). Network time protocol (version 3) specication, implementation.
Nagy, T. and Gingl, Z. (2013). Low-cost photoplethysmograph solutions using the raspberry pi. In Computational Intelligence and Informatics (CINTI), 2013 IEEE 14th International Symposium on, pages 163–167.
Neves, R. and Matos, A. (2013). Raspberry pi based stereo vision for small size asvs. In Oceans San Diego, 2013, pages 1–6.
Simunic, T., Benini, L., and De Micheli, G. (2001). Energy-efcient design of battery-powered embedded systems. Very Large Scale Integration (VLSI) Systems, IEEE Transactions on, 9(1):15–28.
Tian, G.-S., Tian, Y.-C., and Fidge, C. (2008). High-precision relative clock synchronization using time stamp counters. In Engineering of Complex Computer Systems, 2008. ICECCS 2008. 13th IEEE International Conference on, pages 69–78.
Veitch, D., Ridoux, J., and Korada, S. (2009). Robust synchronization of absolute and difference clocks over networks. Networking, IEEE/ACM Transactions on, 17(2):417–430.
Vujovic, V. and Maksimovic, M. (2014). Raspberry pi as a wireless sensor node: Performances and constraints. In Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2014 37th International Convention on, pages 1013–1018.
Published
2015-10-18
How to Cite
CORRÊA, Edilson; DUTRA, Diego; AMORIM, Claudio.
Relógio Virtual Estritamente Crescente para o Computador Raspberry Pi. In: BRAZILIAN SYMPOSIUM ON HIGH PERFORMANCE COMPUTING SYSTEMS (SSCAD), 16. , 2015, Florianópolis.
Anais [...].
Porto Alegre: Sociedade Brasileira de Computação,
2015
.
p. 36-47.
DOI: https://doi.org/10.5753/wscad.2015.14270.
