ACM Transaction of Embedded Computing Systems (TECS) recently informed us that our article “Maximizing the Number of Good Dies for Streaming Applications in NoC-based MPSoCs under Process Variation” has been accepted for publication. This work nicely summarizes the dissertation of Davit Mirzoyan from his four year PhD studies at Delft University of Technology under the supervision of Kees Goossens and myself.
The article addresses design of real-time systems for streaming applications constrained by a throughput requirement with reduced design margins, referred to as better than worst-case design. The first contribution is a complete modeling framework that captures a streaming application mapped to a NoC-based multiprocessor system with voltage-frequency islands under process-induced die-to-die and within-die frequency variations. The framework is used to analyze the impact of variations in the frequency of hardware components on application throughput at the system level. The second contribution is a methodology to use the proposed framework and estimate the impact of reducing circuit design margins on the number of good dies that satisfy the throughput requirement of a real-time streaming application. It is shown on both synthetic and real applications that the proposed design approach can increase the number of good dies by up to 9.6% and 18.8% for designs with and without fixed SRAM and IO blocks, respectively.
The Embedded Systems Week kicks off next week in Montreal, Canada. Two of my students will be giving a total of three presentations, which may be interesting for those following my work. First, Sven Goossens will be presenting his CODES+ISSS paper “A Reconfigurable Real-Time SDRAM Controller for Mixed Time-Criticality Systems” on Monday September 30 10:30 – 11:00. On Thursday October 3, approximately, 09:50 – 10:10, he will also summarize all of his work on memory controllers for mixed time-criticality systems in an invited presentation entitled “A Mixed Time-Criticality SDRAM Controller” at the Memory Architecture and Organization Workshop (MeAOW). At almost the same time, October 3 10:00 – 10:30, Davit Mirzoyan will present his paper “Throughput Analysis and Voltage-Frequency Island Partitioning for Streaming Applications under Process Variation” at the Symposium on Embedded Systems for Real-Time Multimedia (ESTIMedia). We hope to see you there!
ACM Transactions on Embedded Computing Systems (TECS) just accepted our article “Process-Variation Aware Mapping of Best-Effort and Real-Time Streaming Applications to MPSoCs”. This work discusses how to efficiently map streaming applications, represented as synchronous data-flow graphs, with different types of real-time requirements to multi-processor systems affected by process variation (maximum frequencies of each processor follows a statistical distribution). The main goal is to map the tasks of the applications to the system in such a way that the probability of satisfying the real-time requirements of the applications is maximized. This work is an extension of the conference paper “Process-Variation Aware Mapping of Real-Time Streaming Applications to MPSoCs for Improved Yield”, presented at ISQED in 2012. The camera-ready version is available here.