Reliable and Energy Efficient Streaming Multiprocessor Systems by Anup Kumar Das Akash Kumar Bharadwaj Veeravalli & Francky Catthoor

Author:Anup Kumar Das, Akash Kumar, Bharadwaj Veeravalli & Francky Catthoor
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Thus far, the validation of the proposed temperature model is presented. In the next few subsections, results to validate the proposed approach are presented.

4.6.5 MTTF Improvement Considering Task Remapping

Modern multiprocessor systems support remapping of tasks (actors in the SDFG terminology) from faults cores to other working cores. MTTF for these systems need to be computed by considering task remapping, as opposed to the naive way of considering the time to first failure. To highlight the MTTF differences in the two computation techniques, experiments are conducted on a multiprocessor system with six cores and a set of six real-life applications. This is shown in Fig. 4.11a. There are two bars for every application. The left bar is for the MTTF computed considering the first failure and the right one for MTTF computed considering task remapping. As seen from the figure, the two MTTF values are similar for FFT and MP3 decoder applications. For the four other applications, the two MTTF values differ. On average for all applications considered, the MTTF improvement is 15%. To give more insight on the reason for such low MTTF difference for applications such as FFT, as opposed to say, JPEG decoder, Fig. 4.11b plots the mean and the standard deviation of the aging of the different cores for the six applications. The standard deviation of the aging values is a measure of how much the aging of individual cores differ from the mean. A low standard deviation indicates a balanced wear-out of the cores. On the other hand, a high standard deviation indicates some cores age faster than others. The standard deviation is normalized with respect to the mean value of the aging.

Fig. 4.11MTTF difference considering time to first failure and task remapping. (a) MTTF underestimation. (b) Mean and standard deviation of aging

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