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Data structures for task-based priority scheduling 14

Data structures for task-based priority scheduling

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Wimmer, Martin Versaci, Francesco Träff, Jesper Larsson Cederman, Daniel Tsigas, Philippas Faculty of Informatics Parallel Computing Vienna University of Technology 1040 Vienna/Wien Austria Computer Science and Engineering Chalmers University of Technology 412 96 Göteborg Sweden

ISBN: (纸本)9781450326568

We present three lock-free data structures for priority task scheduling: a priority work-stealing one, a centralized one with ρ-relaxed semantics, and a hybrid one combining both concepts. With the single-source shortest path (SSSP) problem as example, we show how the different approaches affect the prioritization and provide upper bounds on the number of examined nodes. We argue that priority task scheduling allows for an intuitive and easy way to parallelize the SSSP problem, notoriously a hard task. Experimental evidence supports the good scalability of the resulting algorithm. the larger aim of this work is to understand the trade-offs between scalability and priority guarantees in task scheduling systems. We show that ρ-relaxation is a valuable technique for improving the first, while still allowing semantic constraints to be satisfied: the lock-free, hybrid κ-priority data structure can scale as well as work-stealing, while still providing strong priority scheduling guarantees, which depend on the parameter κ. Our theoretical results open up possibilities for even more scalable data structures by adopting a weaker form of ρ-relaxation, which still enables the semantic constraints to be respected.

关键词： Scalability

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SCCMulti: An improved parallel strongly connected components algorithm 14

SCCMulti: An improved parallel strongly connected components...

引用

2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Tomkins, Daniel Smith, Timmie Amato, Nancy M. Rauchwerger, Lawrence Parasol Laboratory Department of Computer Science and Engineering Texas A and M University United States

ISBN: (纸本)9781450326568

Tarjan's famous linear time, sequential algorithm for finding the strongly connected components (SCCs) of a graph relies on depth first search, which is inherently sequential. Deterministic parallel algorithms solve this problem in logarithmic time using matrix multiplication techniques, but matrix multiplication requires a large amount of total work. Randomized algorithms based on reachability - the ability to get from one vertex to another along a directed path - greatly improve the work bound in the average case. However, these algorithms do not always perform well;for instance, Divide-and-Conquer Strong Components (DCSC), a scalable, divide-and-conquer algorithm, has good expected theoretical limits, but can perform very poorly on graphs for which the maximum reachability of any vertex is small. A related algorithm, MultiPivot, gives very high probability guarantees on the total amount of work for all graphs, but this improvement introduces an overhead that increases the average running time. this work introduces SCCMulti, a multi-pivot improvement of DCSC that offers the same consistency as MultiPivot without the time overhead. We provide experimental results demonstrating SCCMulti's scalability;these results also show that SCCMulti is more consistent than DCSC and is always faster than MultiPivot.

关键词： Matrix algebra

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CUDA-NP: Realizing nested thread-level parallelism in GPGPU applications 14

CUDA-NP: Realizing nested thread-level parallelism in GPGPU ...

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Yang, Yi Zhou, Huiyang Department of Computing Systems Architecture NEC Laboratories America Inc. United States Department of Electrical and Computer Engineering North Carolina State University United States

ISBN: (纸本)9781450326568

parallel programs consist of series of code sections with different thread-level parallelism (TLP). As a result, it is rather common that a thread in a parallel program, such as a GPU kernel in CUDA programs, still contains both sequential code and parallel loops. In order to leverage such parallel loops, the latest Nvidia Kepler architecture introduces dynamic parallelism, which allows a GPU thread to start another GPU kernel, thereby reducing the overhead of launching kernels from a CPU. However, with dynamic parallelism, a parent thread can only communicate with its child threads through global memory and the overhead of launching GPU kernels is non-trivial even within GPUs. In this paper, we first study a set of GPGPU benchmarks that contain parallel loops, and highlight that these benchmarks do not have a very high loop count or high degrees of TLP. Consequently, the benefits of leveraging such parallel loops using dynamic parallelism are too limited to offset its overhead. We then present our proposed solution to exploit nested parallelism in CUDA, referred to as CUDA-NP. With CUDA-NP, we initially enable a high number of threads when a GPU program starts, and use control flow to activate different numbers of threads for different code sections. We implemented our proposed CUDA-NP framework using a directive-based compiler approach. For a GPU kernel, an application developer only needs to add OpenMP-like pragmas for parallelizable code sections. then, our CUDA-NP compiler automatically generates the optimized GPU kernels. It supports both the reduction and the scan primitives, explores different ways to distribute parallel loop iterations into threads, and efficiently manages on-chip resource. Our experiments show that for a set of GPGPU benchmarks, which have already been optimized and contain nested parallelism, our proposed CUDA-NP framework further improves the performance by up to 6.69 times and 2.18 times on average. Copyright © 2014 acm.

关键词： Application programming interfaces (API)

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Resilient X10: Efficient failure-aware programming 14

Resilient X10: Efficient failure-aware programming

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Cunningham, David Grove, David Herta, Benjamin Iyengar, Arun Kawachiya, Kiyokuni Murata, Hiroki Saraswat, Vijay Takeuchi, Mikio Tardieu, Olivier IBM T. J. Watson Research Center Japan Google Inc. Japan IBM Research Tokyo Japan

ISBN: (纸本)9781450326568

Scale-out programs run on multiple processes in a cluster. In scale-out systems, processes can fail. Computations using traditional libraries such as MPI fail when any component process fails. the advent of Map Reduce, Resilient Data Sets and MillWheel has shown dramatic improvements in productivity are possible when a high-level programming framework handles scale-out and resilience automatically. We are concerned with the development of generalpurpose languages that support resilient programming. In this paper we show how the X10 language and implementation can be extended to support resilience. In Resilient X10, places may fail asynchronously, causing loss of the data and tasks at the failed place. Failure is exposed through exceptions. We identify a Happens Before Invariance Principle and require the runtime to automatically repair the global control structure of the program to maintain this principle. We show this reduces much of the burden of resilient programming. the programmer is only responsible for continuing execution with fewer computational resources and the loss of part of the heap, and can do so while taking advantage of domain knowledge. We build a complete implementation of the language, capable of executing benchmark applications on hundreds of nodes. We describe the algorithms required to make the language runtime resilient. We then give three applications, each with a different approach to fault tolerance (replay, decimation, and domain-level checkpointing). these can be executed at scale and survive node failure. We show that for these programs the overhead of resilience is a small fraction of overall runtime by comparing to equivalent non-resilient X10 programs. On one program we show end-to-end performance of Resilient X10 is ∼100x faster than Hadoop. Copyright © 2014 acm.

关键词： Fault tolerance

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Lazier Imperative programming 14

Lazier Imperative Programming

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Douence, Remi Tabareau, Nicolas Mines Nantes Nantes France INRIA Le Chesnay France

ISBN: (纸本)9781450329477

Laziness is a powerful concept in functional programming that enables reusing general functions in a specific context, while keeping performance close to the efficiency of dedicated definitions. Lazy evaluation can be used in imperative programming too. Twenty years ago, John Launchbury was already advocating for lazy imperative programming, but the level of laziness of his framework remained limited: a single effect can trigger numerous delayed computations, even if those are not required for the correctness of the evaluation. Twenty years after, the picture has not changed. In this article, we propose an Haskell framework to specify computational effects of imperative programs as well as their dependencies. Our framework is based on the operational monad transformer which encapsulates an algebraic presentation of effectful operations. A lazy monad transformer is then in charge of delaying non-necessary computations by maintaining a trace of imperative closures. We present a semantics of a call-by-need A-calculus extended with imperative strict and lazy features and prove the correctness of our approach. While originally motivated by a less rigid use of foreign functions, we show that our approach is fruitful for a simple scenario based on sorted mutable arrays. Furthermore, we can take advantage of equations between algebraic operations to dynamically optimize imperative computations composition.

关键词： Calculations

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Heuristics Entwined with Handlers Combined From Functional Specification to Logic programming Implementation 14

Heuristics Entwined with Handlers Combined From Functional S...

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Schrijvers, Tom Wu, Nicolas Desouter, Benoit Demoen, Bart Univ Ghent Ghent Belgium Univ Oxford Oxford England Katholieke Univ Leuven Leuven Belgium

ISBN: (纸本)9781450329477

A long-standing problem in logic programming is how to cleanly separate logic and control. While solutions exist, they fall short in one of two ways: some are too intrusive, because they require significant changes to Prolog's underlying implementation;others are lacking a clean semantic grounding. We resolve both of these issues in this paper. We derive a solution that is both lightweight and principled. We do so by starting from a functional specification of Prolog based on monads, and extend this with the effect handlers approach to capture the dynamic search tree as syntax. Effect handlers then express heuristics in terms of tree transformations. Moreover, we can declaratively express many heuristics as trees themselves that are combined with search problems using a generic entwining handler. Our solution is not restricted to a functional model: we show how to implement this technique as a library in Prolog by means of delimited continuations.

关键词： monads effect handlers free monad transformer delimited continuations logic programming heuristic tree search

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Real-Time Matching of Antescofo Temporal Patterns 14

Real-Time Matching of <i>Antescofo</i> Temporal Patterns

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Giavitto, Jean-Louis Echeveste, Jose IRCAM UMR STMS 9912 CNRS 1 Pl Igor Stravinsky F-75004 Paris France INRIA MuTant Project 1 Pl Igor Stravinsky F-75004 Paris France Univ Paris 06 Sorbonne Univ 1 Pl Igor Stravinsky F-75004 Paris France

ISBN: (纸本)9781450329477

online matching. Antescofo is a real-time system for performance coordination between musicians and computer processes during live music concert. ATP are used to define complex events that correspond to a combination of perceived events in the musical environment as well as arbitrary logical and metrical temporal conditions. the real-time recognition of such event is used to trigger arbitrary actions in the style of event-condition-action rules. the musical context, the rationales of temporal patterns and several illustrative examples are introduced to motivate the design of ATP. the semantics of ATP matching is defined to parallel the well-known notion of regular expression and Brzozowski's derivatives but extended to handle an infinite alphabet, arbitrary predicates, elapsing time and inhibitory conditions. this approach is compared to those developed in log auditing and for the runtime verification of realtime logics. ATP are implemented by translation into a core subset of the Antescofo domain-specific language. this compilation has proven efficient enough to avoid the extension of the real-time runtime of the language and has been validated with composers in actual pieces.

关键词： timed regular expressions event-driven programming score following timed and reactive system domain-specific language computer music Antescofo

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Structure-Preserving Compilation: Efficient Integration of Functional DSLs into Legacy Systems 14

Structure-Preserving Compilation: Efficient Integration of F...

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Kranz, Julian Simon, Axel Tech Univ Munich Inst Informat 2 Garching Germany

ISBN: (纸本)9781450329477

We present a translation scheme from a pure functional domain-specific language (DSL) to C. the over-arching idea of this scheme is to preserve the structure of the input program as much as possible. this includes, among other things, to refrain from inlining user-written functions and to retain variable names as much as possible. We apply this translation scheme to GDSL, a DSL used for the specification of decoders for machine instructions. GDSL offers non-trivial language features such as monadic actions that our translation scheme maps one-to-one to C statements, resulting in code that closely resembles hand-written C code. Indeed, it is feasible to debug and profile the program at the C level and to interface the generated code with existing C code without marshaling data. Our translation scheme is therefore an attractive starting point for a light-weight DSL since no other language-specific tools besides the compiler are necessary. Moreover, the generated code is amenable to compiler optimizations found in off-the-shelf C compilers. this is illustrated by the performance achieved by a decoder for x86 machine instructions implemented in GDSL which is as fast as a production-quality decoding library shipped by Intel.

关键词： Domain specific languages translation scheme interfacing between programming languages code optimization functional languages type inference instruction decoding

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Assertion-based Debugging of Higher-Order (C) LP Programs 14

Assertion-based Debugging of Higher-Order (C) LP Programs

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Stulova, Nataliia Morales, Jose F. Hermenegildo, Manuel V. IMDEA Software Inst Madrid Spain Tech Univ Madrid UPM Sch Comp Sci Madrid Spain

ISBN: (纸本)9781450329477

Higher-order constructs extend the expressiveness of firstorder (Constraint) Logic programming ((C) LP) both syntactically and semantically. At the same time assertions have been in use for some time in (C) LP systems helping programmers detect errors and validate programs. However, these assertion-based extensions to (C) LP have not been integrated well with higher-order to date. this paper contributes to filling this gap by extending the assertion-based approach to error detection and program verification to the higher-order context within (C) LP. We propose an extension of properties and assertions as used in (C) LP in order to be able to fully describe arguments that are predicates. the extension makes the full power of the assertion language available when describing higher-order arguments. We provide syntax and semantics for (higher-order) properties and assertions, as well as for programs which contain such assertions, including the notions of error and partial correctness. We also discuss several alternatives for performing run-time checking of such programs.

关键词： Logic programming Constraint Logic programming Program Verification Higher Order Run-time Verification Error Detection Debugging Assertions

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BiFluX: A Bidirectional Functional Update Language for XML 14

BiFluX: A Bidirectional Functional Update Language for XML

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Pacheco, Hugo Zan, Tao Hu, Zhenjiang Cornell Univ Ithaca NY 14853 USA Grad Univ Adv Studies Hayama Kanagawa Japan Natl Inst Informat Tokyo Japan

ISBN: (纸本)9781450329477

Different XML formats are widely used for data exchange and processing, being often necessary to mutually convert between them. Standard XML transformation languages, like XSLT or XQuery, are unsatisfactory for this purpose since they require writing a separate transformation for each direction. Existing bidirectional transformation languages mean to cover this gap, by allowing programmers to write a single program that denotes both transformations. However, they often 1) induce a more cumbersome programming style than their traditionally unidirectional relatives, to establish the link between source and target formats, and 2) offer limited configurability, by making implicit assumptions about how modifications to both formats should be translated that may not be easy to predict. this paper proposes a bidirectional XML update language called BIFLUX (BIdirectional FunctionaL Updates for XML), inspired by the FLUX XML update language. Our language adopts a novel bidirectional programming by update paradigm, where a program succinctly and precisely describes how to update a source document with a target document, in an intuitive way, such that there is a unique " inverse" source query for each update program. BIFLUX extends FLUX with bidirectional actions that describe the connection between source and target formats. We introduce a core BIFLUX language, with a clear and well-behaved bidirectional semantics and a decidable static type system based on regular expression types.

关键词： XML bidirectional programming update languages

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