Parallelizing a Real-time Audio Application - A Case Study in Multithreaded Software Engineering
Multicore hardware is ubiquitous, but billions of lines of code in performance-critical commodity software are still sequential. Although parallel libraries, design patterns, and best practice guidelines are available, thinking parallel is still a big challenge for many software engineers.
In this paper we present a case study on parallelizing commodity software using a commercial real-time audio application with over 700,000 lines of code. In contrast to best practice guidelines, our goal is to investigate what parallelization strategy can effectively be used in data stream-intensive applications. Performing an in-depth analysis of the software architecture and its run-time performance, we locate parallelization potential and propose three different parallelization strategies. We evaluate them with respect to their parallel performance impact.
Regarding the application's intrinsic real-time requirement and a very short audio cycle turnaround time, a busy-waiting strategy offers the best audio performance of 327 µs per cycle on an eight-core machine. With an efficiency of 99% this is close to the optimal schedule.
|Zugehörige Institution(en) am KIT
||Institut für Programmstrukturen und Datenorganisation (IPD)
KITopen ID: 1000051693
||17th Workshop on Advances in Parallel and Distributed Computational Models (APDCM) : May 25-29, 2015, Hyderabad, India
||IEEE, Piscataway (NJ)
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