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ICFP 2016
Sun 18 - Sat 24 September 2016 Nara, Japan
Mon 19 Sep 2016 11:10 - 11:35 at Noh Theater - Session 1 Chair(s): Akimasa Morihata

Increasing availability of multicore systems has led to greater focus on the design and implementation of languages for writing parallel programs. Such languages support various abstractions for parallelism, such as fork-join, async-finish, futures. While they may seem similar, these abstractions lead to different semantics, language design and implementation decisions, and can significantly impact the performance of end-user applications.

In this paper, we consider the question of whether it would be possible to unify various paradigms of parallel computing. To this end, we propose a calculus, called dag calculus, that can encode fork-join, async-finish, and futures, and possibly others. We describe dag calculus and its semantics, establish translations from the aforementioned paradigms into dag calculus. These translations establish that dag calculus is sufficiently powerful for encoding programs written in prevailing paradigms of parallelism. We present concurrent algorithms and data structures for realizing dag calculus on multicore hardware and prove that the proposed techniques are consistent with the semantics. Finally, we present an implementation of the calculus and evaluate it empirically by comparing its performance to highly optimized code from prior work. The results show that the calculus is expressive and that it competes well with, and sometimes outperforms, the state of the art.

Mon 19 Sep
Times are displayed in time zone: (GMT+09:00) Osaka, Sapporo, Tokyo change

10:45 - 12:25: Research Papers - Session 1 at Noh Theater
Chair(s): Akimasa MorihataUniversity of Tokyo, Japan
icfp-2016-papers10:45 - 11:10
David CastroUniversity of St. Andrews, UK, Kevin HammondUniversity of St. Andrews, UK, Susmit SarkarUniversity of St. Andrews, UK
icfp-2016-papers11:10 - 11:35
Umut A. AcarCarnegie Mellon University, Arthur CharguéraudInria, France, Mike RaineyInria, France, Filip SieczkowskiInria, France
icfp-2016-papers11:35 - 12:00
Johannes BorgströmUppsala University, Sweden, Ugo Dal LagoUniversity of Bologna, France, Andrew D. GordonMicrosoft Research, UK, Marcin SzymczakUniversity of Edinburgh, UK
icfp-2016-papers12:00 - 12:25
Wazim Mohammed IsmailIndiana University, USA, Chung-chieh ShanIndiana University, USA