DocumentCode :
3587196
Title :
On the Influence of Shared Memory Contention in Real-Time Multicore Applications
Author :
Gracioli, Giovani ; Frohlich, Antonio Auguto
Author_Institution :
Hardware Software Integration Lab. (LISHA), Fed. Univ. of Santa Catarina (UFSC), Joinville, Brazil
fYear :
2014
Firstpage :
25
Lastpage :
30
Abstract :
The continuous evolution of processor technology has allowed the utilization of multicore architectures in the embedded system domain. A major part of embedded systems, however, are inherently real-time (soft and hard) and the use of multicores in this domain is not straightforward due to their unpredictability in bounding worst-case execution scenarios. One of the main factors for unpredictability is the coherence through memory hierarchy. This paper characterizes the influence of contention for shared data memory in the context of embedded real-time applications. By using a benchmark, we have measured the impact of excessive shared memory invalidations on five processors with three different cache-coherence protocols (MESI, MOESI, and MESIF) and two memory organizations (UMA and ccNUMA). Results have shown that the execution time of an application is affected by the contention for shared memory (up to 3.8 times slower). We also provide an analysis on Hardware Performance Counters (HPCs) and propose to use them in order to monitor and detect excessive memory invalidations at run-time.
Keywords :
cache storage; embedded systems; multiprocessing systems; shared memory systems; HPC; MESI; MESIF; MOESI; UMA; cache-coherence protocols; ccNUMA; continuous evolution; hardware performance counters; multicore architectures; processor technology; real-time multicore applications; shared data memory; shared memory contention; Benchmark testing; Hardware; Instruction sets; Message systems; Multicore processing; Protocols; Real-time systems; cache coherence; contention for shared memory; hardware performance counters; real-time multicore systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computing Systems Engineering (SBESC), 2014 Brazilian Symposium on
Type :
conf
DOI :
10.1109/SBESC.2014.8
Filename :
7091161
Link To Document :
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