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Task-oriented programming in a pure functional language 12

Task-oriented programming in a pure functional language

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14th symposium on principles and practice of Declarative programming, PPDP 2012

作者： Plasmeijer, Rinus Lijnse, Bas Michels, Steffen Achten, Peter Koopman, Pieter Institute for Computing and Information Sciences Radboud University P.O. Box 9010 6500 GL Nijmegen Netherlands Faculty of Military Sciences Netherlands Defense Academy P.O. Box 10000 1780 CA Den Helder Netherlands

ISBN: (纸本)9781450315227

Task-Oriented programming (TOP) is a novel programming paradigm for the construction of distributed systems where users work together on the *** multiple users collaborate, they need to interact with each other frequently. TOP supports the definition of tasks that react to the progress made by others. With TOP, complex multi-user interactions can be programmed in a declarative style just by defining the tasks that have to be accomplished, thus eliminating the need to worry about the implementation detail that commonly frustrates the development of applications for this domain. TOP builds on four core concepts: tasks that represent computations or work to do which have an observable value that may change over time, data sharing enabling tasks to observe each other while the work is in progress, generic type driven generation of user interaction, and special combinators for sequential and parallel task composition. the semantics of these core concepts is defined in this paper. As an example we present the iTask3 framework, which embeds TOP in the functional programming language Clean. Copyright © 2012 acm.

关键词： Semantics

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PPoPP'11 - proceedings of the 2011 acm sigplan symposium on principles and practice of parallel programming

PPoPP'11 - Proceedings of the 2011 ACM SIGPLAN Symposium on ...

引用

16th acm symposium on principles and practice of parallel programming, PPoPP'11

ISBN: (纸本)9781450301190

the proceedings contain 39 papers. the topics discussed include: ordered vs. unordered: a comparison of parallelism and work-efficiency in irregular algorithms;programming the memory hierarchy revisited: supporting irregular parallelism in sequoia;compact data structure and scalable algorithms for the sparse grid technique;a domain-specific approach to heterogeneous parallelism;Copperhead: compiling an embedded data parallel language;OoOJava: software out-of-order execution;SpiceC: scalable parallelism via implicit copying and explicit commit;inferring ownership transfer for efficient message passing;all-window profiling and composable models of cache sharing;ULCC: a user-level facility for optimizing shared cache performance on multicores;ScalaExtrap: trace-based communication extrapolation for SPMD programs;and GRace: a low-overhead mechanism for detecting data races in GPU programs.

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Scalable GPU Graph Traversal 12

Scalable GPU Graph Traversal

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Merrill, Duane Garland, Michael Grimshaw, Andrew Univ Virginia Charlottesville VA 22903 USA NVIDIA Corp Santa Clara CA USA

ISBN: (纸本)9781450311601

Breadth-first search (BFS) is a core primitive for graph traversal and a basis for many higher-level graph analysis algorithms. It is also representative of a class of parallel computations whose memory accesses and work distribution are both irregular and data-dependent. Recent work has demonstrated the plausibility of GPU sparse graph traversal, but has tended to focus on asymptotically inefficient algorithms that perform poorly on graphs with non-trivial diameter. We present a BFS parallelization focused on fine-grained task management constructed from efficient prefix sum that achieves an asymptotically optimal O(|V|+|E|) work complexity. Our implementation delivers excellent performance on diverse graphs, achieving traversal rates in excess of 3.3 billion and 8.3 billion traversed edges per second using single and quad-GPU configurations, respectively. this level of performance is several times faster than state-of-the-art implementations both CPU and GPU platforms.

关键词： Algorithms performance Breadth-first search GPU graph algorithms parallel algorithms prefix sum graph traversal sparse graph

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Scalable parallel debugging with statistical assertions 12

Scalable parallel debugging with statistical assertions

引用

17th acm sigplan symposium on principles and practice of parallel programming, PPoPP'12

作者： Dinh, Minh Ngoc Abramson, David Jin, Chao Gontarek, Andrew Moench, Bob DeRose, Luiz Monash University Clayton 3800 VIC Australia Cray Inc. Saint Paul MN 55101-2987 United States

ISBN: (纸本)9781450311601

Traditional debuggers are of limited value for modern scientific codes that manipulate large complex data structures. this paper discusses a novel debug-time assertion, called a "Statistical Assertion", that allows a user to reason about large data structures, and the primitives are parallelised to provide an efficient solution. We present the design and implementation of statistical assertions, and illustrate the debugging technique with a molecular dynamics simulation. We evaluate the performance of the tool on a 12,000 cores Cray XE6.

关键词： Data structures

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Extending a C-like Language for Portable SIMD programming 12

Extending a C-like Language for Portable SIMD Programming

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Leissa, Roland Hack, Sebastian Wald, Ingo Univ Saarland Compiler Design Lab Saarbrucken Germany Intel Corp Visual Applicat Res Santa Clara CA 95051 USA

ISBN: (纸本)9781450311601

SIMD instructions are common in CPUs for years now. Using these instructions effectively requires not only vectorization of code, but also modifications to the data layout. However, automatic vectorization techniques are often not powerful enough and suffer from restricted scope of applicability;hence, programmers often vectorize their programs manually by using intrinsics: compiler-known functions that directly expand to machine instructions. they significantly decrease programmer productivity by enforcing a very error-prone and hard-to-read assembly-like programming style. Furthermore, intrinsics are not portable because they are tied to a specific instruction set. In this paper, we show how a C-like language can be extended to allow for portable and efficient SIMD programming. Our extension puts the programmer in total control over where and how control-flow vectorization is triggered. We present a type system and a formal semantics of our extension and prove the soundness of the type system. Using our prototype implementation IVL that targets Intel's MIC architecture and SSE instruction set, we show that the generated code is roughly on par with handwritten intrinsic code.

关键词： Languages Performance theory language theory parallel programming polymorphism semantics SIMD SIMT type system vectorization

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Communication-Centric Optimizations by Dynamically Detecting Collective Operations 12

Communication-Centric Optimizations by Dynamically Detecting...

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Hoefler, Torsten Schneider, Timo Univ Illinois Dept Comp Sci Urbana IL USA Tech Univ Chemnitz Dept Comp Sci Chemnitz Germany

ISBN: (纸本)9781450311601

the steady increase of parallelism in high-performance computing platforms implies that communication will be most important in large-scale applications. In this work, we tackle the problem of transparent optimization of large-scale communication patterns using online compilation techniques. We utilize the Group Operation Assembly Language (GOAL), an abstract parallel dataflow definition language, to specify our transformations in a device-independent manner. We develop fast schemes that analyze dataflow and synchronization semantics in GOAL and detect if parts of the (or the whole) communication pattern express a known collective communication operation. the detection of collective operations allows us to replace the detected patterns with highly optimized algorithms or low-level hardware calls and thus improve performance significantly. Benchmark results suggest that our technique can lead to a performance improvement of orders of magnitude compared with various optimized algorithms written in Co-Array Fortran. Detecting collective operations also improves the programmability of parallel languages in that the user does not have to understand the detailed semantics of high-level communication operations in order to generate efficient and scalable code.

关键词： Performance Languages Collective Communication parallel Compiler Optimization parallel Dataflow

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PARRAY: A Unifying Array Representation for Heterogeneous parallelism 12

PARRAY: A Unifying Array Representation for Heterogeneous Pa...

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Chen, Yifeng Cui, Xiang Mei, Hong Peking Univ Sch EECS HCST Key Lab Beijing 100871 Peoples R China

ISBN: (纸本)9781450311601

this paper introduces a programming interface called PARRAY (or parallelizing ARRAYs) that supports system-level succinct programming for heterogeneous parallel systems like GPU clusters. the current practice of software development requires combining several low-level libraries like Pthread, OpenMP, CUDA and MPI. Achieving productivity and portability is hard with different numbers and models of GPUs. PARRAY extends mainstream C programming with novel array types of the following features:1)the dimensions of an array type are nested in a tree structure, conceptually reflecting the memory hierarchy;2) the definition of an array type may contain references to other array types, allowing sophisticated array types to be created for parallelization;3) threads also form arrays that allow programming in a Single-Program Multiple-Code block (SPMC) style to unify various sophisticated communication patterns. this leads to shorter, more portable and maintainable parallel codes, while the programmer still has control over performance-related features necessary for deep manual optimization. Although the source-to-source code generator only faithfully generates low-level library calls according to the type information,higher-level programming and automatic performance optimization are still possible through building libraries of subprograms on top of PARRAY. the case study on cluster FFT illustrates a simple 30-line code that 2x-outperforms Intel Cluster MKL on the Tianhe-1A system with 7168 Fermi GPUs and 14336 CPUs.

关键词： Languages Performance theory parallel programming Array Representation Heterogeneous parallelism GPU Clusters

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Portable parallel Performance from Sequential, Productive, Embedded Domain-Specific Languages 12

Portable Parallel Performance from Sequential, Productive, E...

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Kamil, Shoaib Coetzee, Derrick Beamer, Scott Cook, Henry Gonina, Ekaterina Harper, Jonathan Morlan, Jeffrey Fox, Armando Univ Calif Berkeley Berkeley CA 94720 USA Mississippi State Univ Mississippi State MS USA

ISBN: (纸本)9781450311601

Domain-expert productivity programmers desire scalable application performance, but usually must rely on efficiency programmers who are experts in explicit parallel programming to achieve it. Since such programmers are rare, to maximize reuse of their work we propose encapsulating their strategies in mini-compilers for domain-specific embedded languages (DSELs) glued together by a common high-level host language familiar to productivity programmers. the nontrivial applications that use these DSELs perform up to 98% of peak attainable performance, and comparable to or better than existing hand-coded implementations. Our approach is unique in that each mini-compiler not only performs conventional compiler transformations and optimizations, but includes imperative procedural code that captures an efficiency expert's strategy for mapping a narrow domain onto a specific type of hardware. the result is source-and performance-portability for productivity programmers and parallel performance that rivals that of hand-coded efficiency-language implementations of the same applications. We describe a framework that supports our methodology and five implemented DSELs supporting common computation kernels. Our results demonstrate that for several interesting classes of problems, efficiency-level parallel performance can be achieved by packaging efficiency programmers' expertise in a reusable framework that is easy to use for both productivity programmers and efficiency programmers.

关键词： Design Languages Performance Asp SEJITS Python Domain-Specific Languages

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Scalable parallel minimum spanning forest computation 12

Scalable parallel minimum spanning forest computation

引用

17th acm sigplan symposium on principles and practice of parallel programming, PPoPP'12

作者： Nobari, Sadegh Cao, thanh-Tung Karras, Panagiotis Bressan, St´ephane National University of Singapore Singapore Rutgers University United States

ISBN: (纸本)9781450311601

the proliferation of data in graph form calls for the development of scalable graph algorithms that exploit parallel processing environments. One such problem is the computation of a graph's minimum spanning forest (MSF). Past research has proposed several parallel algorithms for this problem, yet none of them scales to large, high-density graphs. In this paper we propose a novel, scalable, parallel MSF algorithm for undirected weighted graphs. Our algorithm leverages Prim's algorithm in a parallel fashion, concurrently expanding several subsets of the computed MSF. Our effort focuses on minimizing the communication among different processors without constraining the local growth of a processor's computed subtree. In effect, we achieve a scalability that previous approaches lacked. We implement our algorithm in CUDA, running on a GPU and study its performance using real and synthetic, sparse as well as dense, structured and unstructured graph data. Our experimental study demonstrates that our algorithm outperforms the previous state-of-the-art GPU-based MSF algorithm, while being several order of magnitude faster than sequential CPU-based algorithms. Copyright © 2012 acm.

关键词： Graphics processing unit

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Deterministic parallel Random-Number Generation for Dynamic-Multithreading Platforms 12

Deterministic Parallel Random-Number Generation for Dynamic-...

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17th acm sigplan symposium on principles and practice of parallel programming

作者： Leiserson, Charles E. Schardl, Tao B. Sukha, Jim MIT Comp Sci & Artificial Intelligence Lab Cambridge MA 02139 USA

ISBN: (纸本)9781450311601

Existing concurrency platforms for dynamic multithreading do not provide repeatable parallel random-number generators. this paper proposes that a mechanism called pedigrees be built into the runtime system to enable efficient deterministic parallel random-number generation. Experiments with the open-source MIT Cilk runtime system show that the overhead for maintaining pedigrees is negligible. Specifically, on a suite of 10 benchmarks, the relative overhead of Cilk with pedigrees to the original Cilk has a geometric mean of less than 1%. We persuaded Intel to modify its commercial C/C++ compiler, which provides the Cilk Plus concurrency platform, to include pedigrees, and we built a library implementation of a deterministic parallel random-number generator called DOTMIX that compresses the pedigree and then "RC6-mixes" the result. the statistical quality of DOTMIX is comparable to that of the popular Mersenne twister, but somewhat slower than a nondeterministic parallel version of this efficient and high-quality serial random-number generator. the cost of calling DOTMIX depends on the "spawn depth" of the invocation. For a naive Fibonacci calculation with n = 40 that calls DOTMIX in every node of the computation, this "price of determinism" is about a factor of 2.3 in running time over the nondeterministic Mersenne twister, but for more realistic applications with less intense use of random numbers - such as a maximal-independent-set algorithm, a practical samplesort program, and a Monte Carlo discrete-hedging application from QuantLib - the observed "price" was at most 2 1%, and sometimes much less. Moreover, even if overheads were several times greater, applications using DOTMIX should be amply fast for debugging purposes, which is a major reason for desiring repeatability.

关键词： Algorithms Performance theory Cilk determinism dynamic multithreading nondeterminism parallel computing pedigree random-number generator

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