检索结果-内蒙古大学图书馆

A practical automatic polyhedral parallelizer and locality optimizer

acm sigplan NOTICES 2008年第6期43卷 101-113页

作者： Bondhugula, Uday Hartono, Albert Ramanujam, J. Sadayappan, P. Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA Louisiana State Univ Dept Elect & Comp Engn Baton Rouge LA 70803 USA Louisiana State Univ CCT Baton Rouge LA 70803 USA

We present the design and implementation of an automatic polyhedral source-to-source transformation framework that can optimize regular programs ( sequences of possibly imperfectly nested loops) for parallelism and locality simultaneously. Through this work, we show the practicality of analytical model-driven automatic transformation in the polyhedral model-far beyond what is possible by current production compilers. Unlike previous works, our approach is an end-to-end fully automatic one driven by an integer linear optimization framework that takes an explicit view of finding good ways of tiling for parallelism and locality using affine transformations. The framework has been implemented into a tool to automatically generate OpenMP parallel code from C program sections. Experimental results from the tool show very high speedups for local and parallel execution on multi-cores over state-of-the-art compiler frameworks from the research community as well as the best native production compilers. The system also enables the easy use of powerful empirical/iterative optimization for general arbitrarily nested loop sequences.

关键词： algorithms design experimentation performance automatic parallelization locality optimization polyhedral model loop transformations affine transformations tiling

来源：评论

学校读者我要写书评

暂无评论

design and evaluation of a compiler for embedded stream programs

引用

acm sigplan NOTICES 2008年第7期43卷 131-140页

作者： Newton, Ryan R. Girod, Lewis D. Craig, Michael B. Madden, Samuel R. Morrisett, J. Greg MIT CSAIL Cambridge MA 02139 USA Harvard Univ Cambridge MA 02138 USA

Applications that combine live data streams with embedded, parallel, and distributed processing are becoming more commonplace. WaveScript is a domain-specific language that brings high-level, type-safe, garbage-collected programming to these domains. This is made possible by three primary implementation techniques, each of which leverages characteristics of the streaming domain. First, we employ a novel evaluation strategy that uses a combination of interpretation and reification to partially evaluate programs into stream dataflow graphs. Second, we use profile-driven compilation to enable many optimizations that are normally only available in the synchronous (rather than asynchronous) dataflow domain. Finally, we incorporate an extensible system for rewrite rules to capture algebraic properties in specific domains (such as signal processing). We have used our language to build and deploy a sensor-network for the acoustic localization of wild animals, in particular, the Yellow-Bellied marmot. We evaluate WaveScript's performance on this application, showing that it yields good performance on both embedded and desktop-class machines, including distributed execution and substantial parallel speedups. Our language allowed us to implement the application rapidly, while outperforming a previous C implementation by over 35%, using fewer than half the lines of code. We evaluate the contribution of our optimizations to this success.

关键词： design languages performance stream processing language sensor networks

来源：评论

学校读者我要写书评

暂无评论

Relational aspects as tracematches 08

Relational aspects as tracematches

引用

7th International conference on Aspect-Oriented Software Development, AOSD.08

作者： Bodden, Eric Shaikh, Reehan Hendren, Laurie School of Computer Science McGill University Montréal QC Canada

ISBN: (纸本)9781605580449

The relationships between objects in an object-oriented program are an essential property of the program's design and implementation. Two previous approaches to implement relationships with aspects were association aspects, an AspectJ-based language extension, and the relationship aspects library. While those approaches greatly ease software development, we believe that they are not general enough. For instance, the library approach only works for binary relationships, while the language extension does not allow for the association of primitive values or values from non-weavable classes. Hence, in this work we propose a generalized alternative implementation via a direct reduction to tracematches, a language feature for executing an advice after having matched a sequence of events. This new implementation scheme yields multiple benefits. Firstly, our implementation is more general than existing ones, avoiding most previous limitations. It also yields a new language construct, relational tracematches. We provide an efficient implementation based on the AspectBench Compiler, along with test cases and microbenchmarks. Our empirical studies showed that our implementation, when compared to previous approaches, uses a similar memory footprint with no leaking, but the generality of our approach does lead to some runtime overhead. We believe that our implementation can provide a solid foundation for future research. Copyright © 2008 acm.

关键词： Aspect oriented programming

来源：评论

学校读者我要写书评

暂无评论

Automatic volume management for programmable microfluidics

引用

acm sigplan NOTICES 2008年第6期43卷 56-67页

作者： Amin, Ahmed M. Thottethodi, Mithuna Vijaykumar, T. N. Wereley, Steven Jacobson, Stephen C. Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA Purdue Univ Sch Mech Engn W Lafayette IN 47907 USA Indiana Univ Dept Chem Bloomington IN 47405 USA

Microfluidics has enabled lab-on-a-chip technology to miniaturize and integrate biological and chemical analyses to a single chip comprising channels, valves, mixers, heaters, separators, and sensors. Recent papers have proposed programmable labs-on-a-chip as an alternative to traditional application-specific chips to reduce design effort, time, and cost. While these previous papers provide the basic support for programmability, this paper identifies and addresses a practical issue, namely, fluid volume management. Volume management addresses the problem that the use of a fluid depletes it and unless the given volume of a fluid is distributed carefully among all its uses, execution may run out of the fluid before all its uses are complete. Additionally, fluid volumes should not overflow (i.e., exceed hardware capacity) or underflow (i.e., fall below hardware resolution). We show that the problem can be formulated as a linear programming problem ( LP). Because LP's complexity and slow execution times in practice may be a concern, we propose another approach, called DAGSolve, which over-constrains the problem to achieve linear complexity while maintaining good solution quality. We also propose two optimizations, called cascading and static replication, to handle cases involving extreme mix ratios and numerous fluid uses which may defeat both LP and DAGSolve. Using some real-world assays, we show that our techniques produce good solutions while being faster than LP.

关键词： algorithms design microfluidics programmable lab-on-a-chip fluid volume management

来源：评论

学校读者我要写书评

暂无评论

XMem: Type-safe, transparent, shared memory for cross-runtime communication and coordination

引用

acm sigplan NOTICES 2008年第6期43卷 327-338页

作者： Wegiel, Michal Krintz, Chandra Univ Calif Santa Barbara Dept Comp Sci Santa Barbara CA 93106 USA

Developers commonly build contemporary enterprise applications using type-safe, component-based platforms, such as J2EE, and architect them to comprise multiple tiers, such as a web container, application server, and database engine. Administrators increasingly execute each tier in its own managed runtime environment (MRE) to improve reliability and to manage system complexity through the fault containment and modularity offered by isolated MRE instances. Such isolation, however, necessitates expensive cross-tier communication based on protocols such as object serialization and remote procedure calls. Administrators commonly co-locate communicating MREs on a single host to reduce communication overhead and to better exploit increasing numbers of available processing cores. However, state-of-the-art MREs offer no support for more efficient communication between co-located MREs, while fast inter-process communication mechanisms, such as shared memory, are widely available as a standard operating system service on most modern platforms. To address this growing need, we present the design and implementation of XMem - type-safe, transparent, shared memory support for co-located MREs. XMem guarantees type-safety through coordinated, parallel, multi-process class loading and garbage collection. To avoid introducing any level of indirection, XMem manipulates virtual memory mapping. In addition, object sharing in XMem is fully transparent: shared objects are identical to local objects in terms of field access, synchronization, garbage collection, and method invocation, with the only difference being that shared-to-private pointers are disallowed. XMem facilitates easy integration and use by existing communication technologies and software systems, such as RMI, JNDI, JDBC, serialization/XML, and network sockets. We have implemented XMem in the open-source, production-quality HotSpot Java Virtual Machine. Our experimental evaluation, based on core communication technologies un

关键词： design experimentation languages management measurement performance interprocess communication managed runtimes shared memory transparent type-safe garbage collection synchronization class loading parallel

来源：评论

学校读者我要写书评

暂无评论

Merge: A programming model for heterogeneous multi-core systems

引用

acm sigplan NOTICES 2008年第3期43卷 287-296页

作者： Linderman, Michael D. Collins, Jamison D. Wang, Hong Meng, Teresa H. Stanford Univ Dept Elect Engn Stanford CA 94305 USA Intel Corp Microarchitecture Res Lab Santa Cruz CA USA

In this paper we propose the Merge framework, a general purpose programming model for heterogeneous multi-core systems. The Merge framework replaces current ad hoc approaches to parallel programming on heterogeneous platforms with a rigorous, library-based methodology that can automatically distribute computation across heterogeneous cores to achieve increased energy and performance efficiency. The Merge framework provides (1) a predicate dispatch-based library system for managing and invoking function variants for multiple architectures;(2) a high-level, library-oriented parallel language based on map-reduce;and (3) a compiler and runtime which implement the map-reduce language pattern by dynamically selecting the best available function implementations for a given input and machine configuration. Using a generic sequencer architecture interface for heterogeneous accelerators, the Merge framework can integrate function variants for specialized accelerators, offering the potential for to-the-metal performance for a wide range of heterogeneous architectures, all transparent to the user. The Merge framework has been prototyped on a heterogeneous platform consisting of an Intel Core 2 Duo CPU and an 8-core 32-thread Intel Graphics and Media Accelerator X3000, and a homogeneous 32-way Unisys SNIP system with Intel Xeon processors. We implemented a set of benchmarks using the Merge framework and enhanced the library with X3000 specific implementations, achieving speedups of 3.6x - 8.5x using the X3000 and 5.2x - 22x using the 32-way system relative to the straight C reference implementation on a single IA32 core.

关键词： performance design languages heterogeneous multi-core GPGPU predicate dispatch

来源：评论

学校读者我要写书评

暂无评论

PLDI 2006 - proceedings of the 2006 acm sigplan conference on programming language design and implementation

PLDI 2006 - Proceedings of the 2006 ACM SIGPLAN Conference o...

引用

PLDI 2006 - 2006 acm sigplan conference on programming language design and implementation

ISBN: (纸本)1595933204

The proceedings contain 36 papers. The topics discussed include: optimizing memory transactions;better extensibility through modular syntax;practical dynamic software updating for C;shared memory programming for large scale machines;SAFECode: enforcing allias analysis for weakly typed languages;pruning dynamic slices with confidence;context-sensitive domain-independent algorithm composition and selection;a global progressive register allocator;accurate, efficient, and adaptive calling context profiling;eventrons: a safe programming construct for high-frequency hard real time applications;continuations and transducer composition;effective static race detection for Java;profile-guided proactive garbage collection for locality optimization;refinement-based context-sensitive points - to analysis for Java;modular verification of assembly code with stack-based control abstractions;and termination proofs for systems code.

关键词： Data storage equipment

来源：评论

学校读者我要写书评

暂无评论

Regularly annotated set constraints 07

Regularly annotated set constraints

引用

conference on programming language design and implementation

作者： Kodumal, John Aiken, Alex Univ Calif Berkeley Coverity Inc Berkeley CA 94720 USA Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9781595936332

A general class of program analyses are a combination of context-free and regular language reachability. We define regularly annotated set constraints, a constraint formalism that captures this class. Our results extend the class of reachability problems expressible naturally in a single constraint formalism, including such diverse applications as interprocedural dataflow analysis, precise type-based flow analysis, and pushdown model checking.

关键词： set constraints context-free language reachability flow analysis annotated inclusion constraints pushdown model checking

来源：评论

学校读者我要写书评

暂无评论

Combining events and threads for scalable network services - implementation and evaluation of monadic, application-level concurrency primitives 07

Combining events and threads for scalable network services -...

引用

conference on programming language design and implementation

作者： Li, Peng Zdancewic, Steve Univ Penn Philadelphia PA 19104 USA

ISBN: (纸本)9781595936332

This paper proposes to combine two seemingly opposed programming models for building massively concurrent network services: the event-driven model and the multithreaded model. The result is a hybrid design that offers the best of both worlds-the ease of use and expressiveness of threads and the flexibility and performance of events. This paper shows how the hybrid model can be implemented entirely at the application level using concurrency monads in Haskell, which provides type-safe abstractions for both events and threads. This approach simplifies the development of massively concurrent software in a way that scales to real-world network services. The Haskell implementation supports exceptions, symmetrical multiprocessing, software transactional memory, asynchronous I/O mechanisms and application-level network protocol stacks. Experimental results demonstrate that this monad-based approach has good performance: the threads are extremely lightweight (scaling to ten million threads), and the I/O performance compares favorably to that of Linux NPTL.

关键词： languages design experimentation performance measurement event thread concurrency networking programming scalability implementation monad haskell

来源：评论

学校读者我要写书评

暂无评论

A certified type-preserving compiler from lambda calculus to assembly language 07

A certified type-preserving compiler from lambda calculus to...

引用

conference on programming language design and implementation

作者： Chlipala, Adam Univ Calif Berkeley Berkeley CA 94720 USA

ISBN: (纸本)9781595936332

We present a certified compiler from the simply-typed lambda calculus to assembly language. The compiler is certified in the sense that it comes with a machine-checked proof of semantics preservation, performed with the Coq proof assistant. The compiler and the terms of its several intermediate languages are given dependent types that guarantee that only well-typed programs are representable. Thus, type preservation for each compiler pass follows without any significant "proofs" of the usual kind. Semantics preservation is proved based on denotational semantics assigned to the intermediate languages. We demonstrate how working with a type-preserving compiler enables type-directed proof search to discharge large parts of our proof obligations automatically.

关键词： languages verification compiler verification interactive proof assistants dependent types denotational semantics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：