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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281-290 订阅

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Æminium: a permission based concurrent-by-default programming language approach 14

Æminium: a permission based concurrent-by-default programmi...

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Proceedings of the 35th acm sigplan conference on programming language design and implementation

作者： Sven Stork Karl Naden Joshua Sunshine Manual Mohr Alcides Fonseca Paulo Marques Jonathan Aldrich Carnegie Mellon University Karlsruhe Institute of Technology University of Coimbra

ISBN: (纸本)9781450327848

The aim of ÆMINIUM is to study the implications of having a concurrent-by-default programming language. This includes language design, runtime system, performance and software engineering *** conduct our study through the design of the concurrent-by-default ÆMINIUM programming language. ÆMINIUM leverages the permission flow of object and group permissions through the program to validate the program's correctness and to automatically infer a possible parallelization strategy via a dataflow graph. ÆMINIUM supports not only fork-join parallelism but more general dataflow patterns of *** this paper we present a formal system, called μÆMINIUM, modeling the core concepts of ÆMINIUM. μÆMINIUM's static type system is based on Featherweight Java with ÆMINIUM-specific extensions. Besides checking for correctness ÆMINIUM's type system it also uses the permission flow to compute a potential parallel execution strategy for the program. μÆMINIUM's dynamic semantics use a concurrent-by-default evaluation approach. Along with the formal system we present its soundness *** provide a full description of the implementation along with the description of various optimization techniques we used. We implemented ÆMINIUM as an extension of the Plaid programming language, which has first-class support for permissions built-in. The ÆMINIUM implementation and all case studies are publicly available under the General Public *** use various case studies to evaluate ÆMINIUM's applicability and to demonstrate that ÆMINIUM parallelized code has performance improvements compared to its sequential counterpart. We chose to use case studies from common domains or problems that are known to benefit from parallelization, to show that ÆMINIUM is powerful enough to encode them. We demonstrate through a webserver application, which evaluates ÆMINIUM's impact on latency-bound applications, that ÆMINIUM can achieve a 70% performance improvement over the sequential counterp

关键词： concurrency access permissions permissions data groups

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It's Alive! Continuous Feedback in UI programming

It's Alive! Continuous Feedback in UI Programming

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34th acm sigplan conference on programming language design and implementation (pldi)

作者： Burckhardt, Sebastian Faehndrich, Manuel de Halleux, Peli McDirmid, Sean Moskal, Michal Tillmann, Nikolai Kato, Jun Univ Tokyo Tokyo 1138654 Japan

Live programming allows programmers to edit the code of a running program and immediately see the effect of the code changes. This tightening of the traditional edit-compile-run cycle reduces the cognitive gap between program code and execution, improving the learning experience of beginning programmers while boosting the productivity of seasoned ones. Unfortunately, live programming is difficult to realize in practice as imperative languages lack well-defined abstraction boundaries that make live programming responsive or its feedback comprehensible. This paper enables live programming for user interface programming by cleanly separating the rendering and non-rendering aspects of a UI program, allowing the display to be refreshed on a code change without restarting the program. A type and effect system formalizes this separation and provides an evaluation model that incorporates the code update step. By putting live programming on a more formal footing, we hope to enable critical and technical discussion of live programming systems.

关键词： languages Human Factors Live programming Graphical User Interface

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Fast RMWs for TSO: Semantics and implementation

Fast RMWs for TSO: Semantics and Implementation

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34th acm sigplan conference on programming language design and implementation (pldi)

作者： Rajaram, Bhargava Nagarajan, Vijay Sarkar, Susmit Elver, Marco Univ Edinburgh Edinburgh EH8 9YL Midlothian Scotland Univ St Andrews St Andrews KY16 9AJ Fife Scotland

ISBN: (纸本)9781450320146

Read-Modify-Write (RMW) instructions are widely used as the building blocks of a variety of higher level synchronization constructs, including locks, barriers, and lock-free data structures. Unfortunately, they are expensive in architectures such as x86 and SPARC which enforce (variants of) Total-Store-Order (TSO). A key reason is that RMWs in these architectures are ordered like a memory barrier, incurring the cost of a write-buffer drain in the critical path. Such strong ordering semantics are dictated by the requirements of the strict atomicity definition (type-1) that existing TSO RMWs use. Programmers often do not need such strong semantics. Besides, weakening the atomicity definition of TSO RMWs, would also weaken their ordering - thereby leading to more efficient hardware implementations. In this paper we argue for TSO RMWs to use weaker atomicity definitions - we consider two weaker definitions: type-2 and type-3, with different relaxed ordering differences. We formally specify how such weaker RMWs would be ordered, and show that type-2 RMWs, in particular, can seamlessly replace existing type-1 RMWs in common synchronization idioms - except in situations where a type-1 RMW is used as a memory barrier. Recent work has shown that the new C/C++ 11 concurrency model can be realized by generating conventional (type-1) RMWs for C/C++ 11 SC-atomic-writes and/or SC-atomic-reads. We formally prove that this is equally valid using the proposed type-2 RMWs;type-3 RMWs, on the other hand, could be used for SC-atomic-reads (and optionally SC-atomic-writes). We further propose efficient microarchitectural implementations for type-2 (type-3) RMWs - simulation results show that our implementation reduces the cost of an RMW by up to 58.9% (64.3%), which translates into an overall performance improvement of up to 9.0% (9.2%) on a set of parallel programs, including those from the SPLASH-2, PARSEC, and STAMP benchmarks.

关键词： design Performance Experimentation Read-Modify-Write (RMW) Total-Store-Order (TSO) Atomics

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Position paper: Sapper - A language for provable hardware policy enforcement

Position paper: Sapper - A language for provable hardware po...

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2013 8th acm sigplan Workshop on programming languages and Analysis for Security, PLAS 2013 - Co-located with pldi 2013

作者： Li, Xun Kashyap, Vineeth Oberg, Jason K. Tiwari, Mohit Rajarathinam, Vasanth Ram Kastner, Ryan Sherwood, Timothy Hardekopf, Ben Chong, Frederic T. Department of Computer Science University of California Santa Barbara Santa Barbara CA United States Department of Computer Science and Engineering University of California San Diego San Diego CA United States Department of Electrical Engineering and Computer Science University of California Berkeley Berkeley CA United States

ISBN: (纸本)9781450321440

We describe Sapper, a language for creating critical hardware components that have provably secure information flow. Most systems that enforce information flow policies place the hardware microarchitecture within the trusted computing base, and also assume that the observable behavior of that microarchitecture is fully and correctly documented. However, the reality is that this behavior is incompletely (and sometimes incorrectly) specified, and that the microarchitecture itself often contains implementation bugs. This fact means that all such systems are vulnerable to attack by exploiting undocumented or buggy hardware features. Sapper addresses this problem by enabling flexible and efficient hardware design that is provably secure with respect to a given information flow policy. Sapper uses a hybrid approach that leverages unique language features and static analysis to determine a set of dynamic checks that are automatically inserted into the hardware design. These checks are provably sufficient to guarantee that the resulting hardware prevents all explicit, implicit, and timing channels even if the hardware is otherwise buggy or poorly documented. Copyright © 2013 acm 978-1-4503-2144-0/13/06. . . $15.00.

关键词： Static analysis

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The Bedrock Structured programming System Combining Generative Metaprogramming and Hoare Logic in an Extensible Program Verifier 13

The Bedrock Structured Programming System Combining Generati...

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18th acm sigplan International conference on Functional programming

作者： Chlipala, Adam MIT CSAIL Cambridge MA USA

ISBN: (纸本)9781450323260

We report on the design and implementation of an extensible programming language and its intrinsic support for formal verification. Our language is targeted at low-level programming of infrastructure like operating systems and runtime systems. It is based on a cross-platform core combining characteristics of assembly languages and compiler intermediate languages. From this foundation, we take literally the saying that C is a "macro assembly language": we introduce an expressive notion of certified low-level macros, sufficient to build up the usual features of C and beyond as macros with no special support in the core. Furthermore, our macros have integrated support for strongest postcondition calculation and verification condition generation, so that we can provide a high-productivity formal verification environment within Coq for programs composed from any combination of macros. Our macro interface is expressive enough to support features that low-level programs usually only access through external tools with no formal guarantees, such as declarative parsing or SQL-inspired querying. The abstraction level of these macros only imposes a compile-time cost, via the execution of functional Coq programs that compute programs in our intermediate language;but the run-time cost is not substantially greater than for more conventional C code. We describe our experiences constructing a full C-like language stack using macros, with some experiments on the verifiability and performance of individual programs running on that stack.

关键词： generative metaprogramming interactive proof assistants low-level programming languages functional programming

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Exadapt'11 - Proceedings of the 1st International Workshop on Adaptive Self-Tuning Computing Systems for the Exaflop Era - In Cooperation with the 32nd acm sigplan conference on programming language design and implementation, pldi 2011

Exadapt'11 - Proceedings of the 1st International Workshop o...

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1st acm sigplan International Workshop on Adaptive Self-Tuning Computing Systems for the Exaflop Era, Exadapt 2011 - Co-located with 32nd acm sigplan conference on programming language design and implementation, pldi 2011 at FCRC 2011

ISBN: (纸本)9781450307086

The proceedings contain 7 papers. The topics discussed include: AARTS: low overhead online adaptive auto-tuning;contentiousness vs. sensitivity: improving contention aware runtime systems on multicore architectures;probabilistic auto-tuning for architectures with complex constraints;efficiently exploring compiler optimization sequences with pair-wise pruning;adapt or become extinct!;loaf: a framework and infrastructure for creating online adaptive solutions;and using a codelet program execution model for exascale machines.

关键词： Software architecture

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Isolation for Nested Task Parallelism 13

Isolation for Nested Task Parallelism

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2013 acm sigplan International conference on Object Oriented programming Systems languages

作者： Zhao, Jisheng Lublinerman, Roberto Budimlic, Zoran Chaudhuri, Swarat Sarkar, Vivek Rice Univ Houston TX 77251 USA Google Inc Mountain View CA USA

ISBN: (纸本)9781450323741

Isolation-the property that a task can access shared data without interference from other tasks-is one of the most basic concerns in parallel programming. While there is a large body of past work on isolated task-parallelism, the integration of isolation, task-parallelism, and nesting of tasks has been a difficult and unresolved challenge. In this paper, we present a programming and execution model called Otello where isolation is extended to arbitrarily nested parallel tasks with irregular accesses to heap data. At the same time, no additional burden is imposed on the programmer, who only exposes parallelism by creating and synchronizing parallel tasks, leaving the job of ensuring isolation to the underlying compiler and runtime system. Otello extends our past work on Aida execution model and the delegated isolation mechanism [22] to the setting of nested parallelism. The basic runtime construct in Aida and Otello is an assembly: a task equipped with a region in the shared heap that it owns. When an assembly A conflicts with an assembly B, A transfers-or delegates-its code and owned region to a carefully selected assembly C in a way that will ensure isolation with B, leaving the responsibility of re-executing task A to C. The choice of C depends on the nesting relationship between A and B. We have implemented Otello on top of the Habanero Java (HJ) parallel programming language [8], and used this implementation to evaluate Otello on collections of nested task-parallel benchmarks and non-nested transactional benchmarks from past work. On the nested task-parallel bench-marks, Otello achieves scalability comparable to HJ programs without built-in isolation, and the relative overhead of Otello is lower than that of many published data-race detection algorithms that detect the isolation violations (but do not enforce isolation). For the transactional benchmarks, Otello incurs lower overhead than a state-of-the-art software transactional memory system (Deuce STM).

关键词： languages design Isolation programming abstractions Irregular parallelism Contention

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Quipper: A Scalable Quantum programming language 13

Quipper: A Scalable Quantum Programming Language

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acm sigplan conference on programming language design and implementation

作者： Alexander S. Green Peter LeFanu Lumsdaine Neil J. Ross Peter Selinger Benoit Valiron Dalhousie University Institute of Advanced Studies University of Pennsylvania

ISBN: (纸本)9781450320146

The field of quantum algorithms is vibrant. Still, there is currently a lack of programming languages for describing quantum computation on a practical scale, i.e., not just at the level of toy problems. We address this issue by introducing Quipper, a scalable, expressive, functional, higher-order quantum programming language. Quipper has been used to program a diverse set of non-trivial quantum algorithms, and can generate quantum gate representations using trillions of gates. It is geared towards a model of computation that uses a classical computer to control a quantum device, but is not dependent on any particular model of quantum hardware. Quipper has proven effective and easy to use, and opens the door towards using formal methods to analyze quantum algorithms.

关键词： Quipper Quantum programming languages

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Finding Optimum Abstractions in Parametric Dataflow Analysis 13

Finding Optimum Abstractions in Parametric Dataflow Analysis

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acm sigplan conference on programming language design and implementation

作者： Xin Zhang Mayur Naik Hongseok Yang Georgia Institute of Technology University of Oxford

ISBN: (纸本)9781450320146

We propose a technique to efficiently search a large family of abstractions in order to prove a query using a parametric dataflow analysis. Our technique either finds the cheapest such abstraction or shows that none exists. It is based on counterexample-guided abstraction refinement but applies a novel meta-analysis on abstract counterexample traces to efficiently find abstractions that are incapable of proving the query. We formalize the technique in a generic framework and apply it to two analyses: a type-state analysis and a thread-escape analysis. We demonstrate the effectiveness of the technique on a suite of Java benchmark programs.

关键词： Dataflow analysis CEGAR Abstraction refinement Optimum abstraction Impossibility Under-approximation languages Verification data flow analysis language Probability Verification Abstraction Parametric

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Terra: A Multi-Stage language for High-Performance Computing 13

Terra: A Multi-Stage Language for High-Performance Computing

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acm sigplan conference on programming language design and implementation

作者： Zachary DeVito James Hegarty Alex Aiken Pat Hanrahan Jan Vitek Stanford University Purdue University

ISBN: (纸本)9781450320146

High-performance computing applications, such as auto-tuners and domain-specific languages, rely on generative programming techniques to achieve high performance and portability. However, these systems are often implemented in multiple disparate languages and perform code generation in a separate process from program execution, making certain optimizations difficult to engineer. We leverage a popular scripting language, Lua, to stage the execution of a novel low-level language, Terra. Users can implement optimizations in the high-level language, and use built-in constructs to generate and execute high-performance Terra code. To simplify meta-programming, Lua and Terra share the same lexical environment, but, to ensure performance, Terra code can execute independently of Lua's runtime. We evaluate our design by reimplementing existing multi-language systems entirely in Terra. Our Terra-based auto-tuner for BLAS routines performs within 20% of ATLAS, and our DSL for stencil computations runs 2.3x faster than hand-written C.

关键词： Lua Staged computation DSL design Performance

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