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检索条件"任意字段=ACM SIGPLAN Conference on Programming Language Design and Implementation, PLDI 1988"

共 918 条记录，以下是231-240 订阅

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First-class Runtime Generation of High-performance Types using Exotypes 14

First-class Runtime Generation of High-performance Types usi...

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： DeVito, Zachary Ritchie, Daniel Fisher, Matt Aiken, Alex Hanrahan, Pat Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9781450327848

We introduce exotypes, user-defined types that combine the flexibility of meta-object protocols in dynamically-typed languages with the performance control of low-level languages. Like objects in dynamic languages, exotypes are defined programmatically at runtime, allowing behavior based on external data such as a database schema. To achieve high performance, we use staged programming to define the behavior of an exotype during a runtime compilation step and implement exotypes in Terra, a low-level staged programming language. We show how exotype constructors compose, and use exotypes to implement high-performance libraries for serialization, dynamic assembly, automatic differentiation, and probabilistic programming. Each exotype achieves expressiveness similar to libraries written in dynamically-typed languages but implements optimizations that exceed the performance of existing libraries written in low-level statically-typed languages. Though each implementation is significantly shorter, our serialization library is 11 times faster than Kryo, and our dynamic assembler is 3-20 times faster than Google's Chrome assembler.

关键词： design Performance Lua Staged computation DSL

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Supporting array programming in X10 1

Supporting array programming in X10

引用

1st acm sigplan International Workshop on Libraries, languages and Compilers for Array programming, ARRAY 2014 - Part of pldi 2014

作者： Grove, David Milthorpe, Josh Tardieu, Olivier IBM Research Australia Australian National University Australia

ISBN: (纸本)9781450329378

Effective support for array-based programming has long been one of the central design concerns of the X10 programming language. After significant research and exploration, X10 has adopted an approach based on providing arrays via user definable and extensible class libraries. This paper surveys the range of array abstractions available to the programmer in X10 2.4 and describes the key language features and language implementation techniques necessary to make efficient and productive implementations of these abstractions possible.. Copyright © 2014 acm 978-1-4503-2937-8/14/06. 15.00.

关键词： Abstracting

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FlashExtract: A Framework for Data Extraction by Examples 14

FlashExtract: A Framework for Data Extraction by Examples

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Le, Vu Gulwani, Sumit Univ Calif Davis Davis CA 95616 USA Microsoft Res Redmond Redmond WA USA

ISBN: (纸本)9781450327848

Various document types that combine model and view (e. g., text files, webpages, spreadsheets) make it easy to organize (possibly hierarchical) data, but make it difficult to extract raw data for any further manipulation or querying. We present a general framework FlashExtract to extract relevant data from semi-structured documents using examples. It includes: (a) an interaction model that allows end-users to give examples to extract various fields and to relate them in a hierarchical organization using structure and sequence constructs. (b) an inductive synthesis algorithm to synthesize the intended program from few examples in any underlying domain-specific language for data extraction that has been built using our specified algebra of few core operators (map, filter, merge, and pair). We describe instantiation of our framework to three different domains: text files, webpages, and spreadsheets. On our benchmark comprising 75 documents, FlashExtract is able to extract intended data using an average of 2.36 examples in 0.84 seconds per field.

关键词： languages Algorithms Human Factors Program Synthesis End-user programming programming by Examples

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A Lightweight Symbolic Virtual Machine for Solver-Aided Host languages 14

A Lightweight Symbolic Virtual Machine for Solver-Aided Host...

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Torlak, Emina Bodik, Rastislav Univ Calif Berkeley Berkeley CA 94608 USA

ISBN: (纸本)9781450327848

Solver-aided domain-specific languages (SDSLs) are an emerging class of computer-aided programming systems. They ease the construction of programs by using satisfiability solvers to automate tasks such as verification, debugging, synthesis, and non-deterministic execution. But reducing programming tasks to satisfiability problems involves translating programs to logical constraints, which is an engineering challenge even for domain-specific languages. We have previously shown that translation to constraints can be avoided if SDSLs are implemented by (traditional) embedding into a host language that is itself solver-aided. This paper describes how to implement a symbolic virtual machine (SVM) for such a host language. Our symbolic virtual machine is lightweight because it compiles to constraints only a small subset of the host's constructs, while allowing SDSL designers to use the entire language, including constructs for DSL embedding. This lightweight compilation employs a novel symbolic execution technique with two key properties: it produces compact encodings, and it enables concrete evaluation to strip away host constructs that are outside the subset compilable to constraints. Our symbolic virtual machine architecture is at the heart of ROSETTE, a solver-aided language that is host to several new SDSLs.

关键词： design languages Solver-Aided languages Symbolic Virtual Machine

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Adaptive, Efficient, Parallel Execution of Parallel Programs 14

Adaptive, Efficient, Parallel Execution of Parallel Programs

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Sridharan, Srinath Gupta, Gagan Sohi, Gurindar S. Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450327848

Future multicore processors will be heterogeneous, be increasingly less reliable, and operate in dynamically changing operating conditions. Such environments will result in a constantly varying pool of hardware resources which can greatly complicate the task of efficiently exposing a program's parallelism onto these resources. Coupled with this uncertainty is the diverse set of efficiency metrics that users may desire. This paper proposes Varuna, a system that dynamically, continuously, rapidly and transparently adapts a program's parallelism to best match the instantaneous capabilities of the hardware resources while satisfying different efficiency metrics. Varuna is applicable to both multithreaded and task-based programs and can be seamlessly inserted between the program and the operating system without needing to change the source code of either. We demonstrate Varuna's effectiveness in diverse execution environments using unaltered C/C++ parallel programs from various benchmark suites. Regardless of the execution environment, Varuna always outperformed the state-of-the-art approaches for the efficiency metrics considered.

关键词： design Experimentation Measurement Performance Autotuning parallel programming performance portability performance tuning run-time optimization

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What exactly is inexact computation good for?

What exactly is inexact computation good for?

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Palem, Krishna Rice Univ Dept Comp Sci Houston TX 77251 USA

ISBN: (纸本)9781450327848

Our willingness to deliberately trade accuracy of computing systems for significant resource savings, notably energy consumption, got a boost from two directions. First, energy (or power, the more popularly used measure) consumption started emerging as a serious hurdle to our ability to continue scaling the complexity of processors, and thus enable ever richer computing applications. This "energy hurdle" spanned the gamut from large data-centers to portable embedded computing systems. Second, many believed that an engine of growth that supported scaling, captured by Gordon Moore's remarkable prophecy (Moore's law), was headed towards an irrevocable cliff edge - when this happens, our ability to produce computing systems whose hardware would support precise or exact computing would diminish greatly. In this talk which emphasizes the physical and hardware layers of abstraction where all of these troubles start (after all energy is rooted in thermodynamics), I will first review reasons that compelled and encouraged us to consider trading accuracy for energy savings deliberately resulting in inexact computing. Copyright © 2014 acm.

关键词： Algorithms design languages Performance Inexact or approximate computing power efficiency energy efficiency

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DOPPIO: Breaking the Browser language Barrier 14

DOPPIO: Breaking the Browser Language Barrier

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Vilk, John Berger, Emery D. Univ Massachusetts Sch Comp Sci Amherst MA 01003 USA

ISBN: (纸本)9781450327848

Web browsers have become a de facto universal operating system, and JavaScript its instruction set. Unfortunately, running other languages in the browser is not generally possible. Translation to JavaScript is not enough because browsers are a hostile environment for other languages. Previous approaches are either non-portable or require extensive modifications for programs to work in a browser. This paper presents DOPPIO, a JavaScript-based runtime system that makes it possible to run unaltered applications written in general-purpose languages directly inside the browser. DOPPIO provides a wide range of runtime services, including a file system that enables local and external (cloud-based) storage, an unmanaged heap, sockets, blocking I/O, and multiple threads. We demonstrate DOPPIO's usefulness with two case studies: we extend Emscripten with DOPPIO, letting it run an unmodified C++ application in the browser with full functionality, and present DOPPIOJVM, an interpreter that runs unmodified JVM programs directly in the browser. While substantially slower than a native JVM (between 24 x and 42 x slower on CPU-intensive benchmarks in Google Chrome), DOPPIOJVM makes it feasible to directly reuse existing, non compute-intensive code.

关键词： languages design Web Browsers programming languages JVM Operating Systems JavaScript

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Improving JavaScript Performance by Deconstructing the Type System 14

Improving JavaScript Performance by Deconstructing the Type ...

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Ahn, Wonsun Choi, Jiho Shull, Thomas Garzaran, Maria J. Torrellas, Josep Univ Illinois Champaign IL 61820 USA

ISBN: (纸本)9781450327848

Increased focus on Java Script performance has resulted in vast performance improvements for many benchmarks. However, for actual code used in websites, the attained improvements often lag far behind those for popular benchmarks. This paper shows that the main reason behind this shortfall is how the compiler understands types. Java Script has no concept of types, but the compiler assigns types to objects anyway for ease of code generation. We examine the way that the Chrome V8 compiler defines types, and identify two design decisions that are the main reasons for the lack of improvement: (1) the inherited prototype object is part of the current object's type definition, and (2) method bindings are also part of the type definition. These requirements make types very unpredictable, which hinders type specialization by the compiler. Hence, we modify V8 to remove these requirements, and use it to compile the Java Script code assembled by JSBench from real websites. On average, we reduce the execution time of JSBench by 36%, and the dynamic instruction count by 49%.

关键词： design languages Performance Java Script Scripting language Dynamic Typing Type Specialization Hidden Class Inline Caching Prototype

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Globally Precise-restartable Execution of Parallel Programs 14

Globally Precise-restartable Execution of Parallel Programs

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Gupta, Gagan Sridharan, Srinath Sohi, Gurindar S. Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450327848

Emerging trends in computer design and use are likely to make exceptions, once rare, the norm, especially as the system size grows. Due to exceptions, arising from hardware faults, approximate computing, dynamic resource management, etc., successful and error-free execution of programs may no longer be assured. Yet, designers will want to tolerate the exceptions so that the programs execute completely, efficiently and without external intervention. Modern computers easily handle exceptions in sequential programs, using precise interrupts. But they are ill-equipped to handle exceptions in parallel programs, which are growing in prevalence. In this work we introduce the notion of globally precise-restartable execution of parallel programs, analogous to precise-interruptible execution of sequential programs. We present a software runtime recovery system based on the approach to handle exceptions in suitably-written parallel programs. Qualitative and quantitative analyses show that the proposed system scales with the system size, especially when exceptions are frequent, unlike the conventional checkpoint-and-recovery method.

关键词： design Experimentation Measurement Performance Reliability Deterministic Multithreading Precise Exceptions

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Test-Driven Synthesis 14

Test-Driven Synthesis

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35th acm sigplan conference on programming language design and implementation (pldi)

作者： Perelman, Daniel Gulwani, Sumit Grossman, Dan Provost, Peter Univ Washington Seattle WA 98195 USA Microsoft Corp Mountain View CA USA

ISBN: (纸本)9781450327848

programming-by-example technologies empower end-users to create simple programs merely by providing input/output examples. Existing systems are designed around solvers specialized for a specific set of data types or domain-specific language (DSL). We present a program synthesizer which can be parameterized by an arbitrary DSL that may contain conditionals and loops and therefore is able to synthesize programs in any domain. In order to use our synthesizer, the user provides a sequence of increasingly sophisticated input/output examples along with an expert-written DSL definition. These two inputs correspond to the two key ideas that allow our synthesizer to work in arbitrary domains. First, we developed a novel iterative synthesis technique inspired by test-driven development-which also gives our technique the name of test-driven synthesis-where the input/output examples are consumed one at a time as the program is refined. Second, the DSL allows our system to take an efficient component-based approach to enumerating possible programs. We present applications of our synthesis methodology to end-user programming for transformations over strings, XML, and table layouts. We compare our synthesizer on these applications to state-of-the-art DSL-specific synthesizers as well to the general purpose synthesizer Sketch.

关键词： languages Experimentation program synthesis end-user programming test driven development

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