Events Calendar

Computer Engineering Seminar

Speaker: Dr. Fernando Moraes, PUCRS (Pontifical Catholic University of Rio Grande do Sul), Porto Alegre, Brasil

Talk Title: Adaptability techniques for QoS and distributed management of MPSoCs

Abstract: Adaptability techniques - With the significant increase in the number of processing elements in NoC-Based MPSoCs, communication becomes, increasingly, a critical resource for performance gains and QoS guarantees. The main gap observed in the NoC-Based MPSoCs literature is the runtime adaptive techniques to meet QoS. In the absence of such techniques, the system user must statically define, for example, the scheduling policy, communication priorities, and the communication switching mode of applications. The goal of this research is to investigate the runtime adaptation of the NoC resources, according to the QoS requirements of each application running in the MPSoC. The present work adopts a NoC architecture with duplicated physical channels, adaptive routing, support to flow priorities and simultaneous packet and circuit switching. The monitoring and adaptation management is performed at the operating system level, ensuring QoS to the monitored applications. The QoS acts in the flow priority and the switching mode. Monitoring and QoS adaptation were implemented in software, resulting in flexibility to apply the techniques to other platforms or include other adaptive techniques, as task migration or DVFS. Applications with latency and throughput deadlines run concurrently with best-effort applications. Results with synthetic and real application reduced in average 60% the latency violations, ensuring smaller jitter and throughput. The execution time of applications is not penalized applying the proposed QoS adaptation methods.

Distributed Management - Scalability is an important issue in large MPSoCs. MPSoCs may execute several applications in parallel, with dynamic workload, and tight QoS constraints. Thus, the MPSoC management must be distributed to cope with such constraints. This talk presents a distributed resource management in NoC-Based MPSoC, using a clustering method, enabling the modification of the cluster size at runtime. This work addresses the following distributed techniques: task mapping, monitoring and task migration. Results show an important reduction in the total execution time of applications, reduced number of hops between tasks (smaller communication energy), and a reclustering method through monitoring and task migration.

Biography: Fernando Moraes received the Electrical Engineering and M.Sc. degrees from the Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil, in 1987 and 1990, respectively. In 1994 he received the Ph.D. degree from the Laboratoire d ́Informatique, Robotique et Microélectronique de Montpellier (LIRMM), France. He is currently at PUCRS. From 1998 to 2000 he joined the LIRMM as an Invited Professor for 3 months each year. He has authored and co-authored 24 peer refereed journal articles in the field of VLSI design, comprising the development of networks on chip and telecommunication circuits. One of these articles, HERMES: an Infrastructure for Low Area Overhead Packet-switching Networks on Chip, is cited by more than 500 other papers. He has also authored and co-authored more than 180 conference papers on these topics. He has advised 23 MsC, advised 4 PhD and co-advised 3 PhD works. His primary research interests include Microelectronics, FPGAs, reconfigurable architectures, NoCs (networks on chip) and MPSoCs (multiprocessor system on chip). SBC, SBMICRO and IEEE Senior Member.

Host: Prof. Peter Beerel

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248

Audiences: Everyone Is Invited

Contact: Annie Yu