Work Stealing

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Presentation Slides, PDFs, Source Code and other presenter materials are available at: https://github.com/cppcon/cppcon2015 — If you've used a C++ parallel-programming system in the last decade, you've probably run across the term "work stealing." Work stealing is a scheduling strategy that automatically balances a parallel workload among available CPUs in a multi-core computer, using computation resources with theoretical utilization that is nearly optimal. Modern C++ parallel template libraries such as Intel(R)'s TBB or Microsoft*'s PPL and language extensions such as Intel(R) Cilk(tm) Plus or OpenMP tasks are implemented using work-stealing runtime libraries. Most C++ programmers pride themselves on understanding how their programs execute on the underlying machine. Yet, when it comes to parallel programming, many programmers mistakenly believe that if you understand threads, then you understand parallel runtime libraries. In this talk, we'll investigate how work-stealing applies to the semantics of a parallel C++ program. We'll look at the theoretical underpinnings of work-stealing, now it achieves near optimal machine utilization, and a bit about how it's implemented. In the process, we'll discover some pit-falls and how to avoid them. You should leave this talk with a deeper appreciation of how parallel software runs on real systems. Previous experience with parallel programming is helpful but not required. A medium level of expertise in C++ is assumed. — Pablo Halpern has been programming in C++ since 1989 and has been a member of the C++ Standards Committee since 2007. He is currently the Parallel Programming Languages Architect at Intel Corp., where he coordinates the efforts of teams working on Cilk Plus, TBB, OpenMP, and other parallelism languages, frameworks, and tools targeted to C++, C, and Fortran users. Pablo came to Intel from Cilk Arts, Inc., which was acquired by Intel in 2009. During his time at Cilk Arts, he co-authored the paper "Reducers and other Cilk++ Hyperobjects", which won best paper at the SPAA 2009 conference. His current work is focused on creating simpler and more powerful parallel programming languages and tools for Intel's customers and promoting adoption of parallel constructs into the C++ and C standards. He lives with his family in southern New Hampshire, USA. When not working on parallel programming, he enjoys studying the viola, skiing, snowboarding, and watching opera. Twitter handle: @PabloGHalpern — Videos Filmed & Edited by Bash Films: http://www.BashFilms.com

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C++

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2

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CPPConD02V026

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