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Parallel object-oriented framework optimization

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2004年第2-3期16卷 293-302页

作者： Quinlan, DJ Schordan, M Miller, B Kowarschik, M Lawrence Livermore Natl Lab Ctr Appl Sci Comp Livermore CA 94550 USA Univ Erlangen Nurnberg Dept Comp Sci Syst Simulat Grp Erlangen Germany

Sophisticated parallel languages are difficult to develop;most parallel distributed memory scientific applications are developed using a serial language, expressing parallelism through third party libraries (e.g. MPI). As a result, frameworks and libraries are often used to encapsulate significant complexities. We define a novel approach to optimize the use of libraries within applications. The resulting tool, named ROSE, leverages the additional semantics provided by library-defined abstractions enabling library specific optimization of application codes. It is a common perception that performance is inversely proportional to the level of abstraction. Our work shows that this is not the case if the additional semantics can be leveraged. We show how ROSE can be used to leverage the semantics within the compile-time optimization. Copyright (C) 2004 John Wiley Sons, Ltd.

关键词： telescoping languages AST restructuring tools semantics-based transformations object-oriented optimizations

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Quantifying and evaluating the space overhead for alternative C++ memory layouts

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SOFTWARE-PRACTICE & EXPERIENCE 2003年第7期33卷 595-636页

作者： Sweeney, PF Burke, M IBM Corp Thomas J Watson Res Ctr Yorktown Hts NY 10598 USA

This paper develops a formalism that precisely characterizes when class tables are required for C++ memory layouts. A memory layout is a particular choice of data structures for implementing run-time support for object-oriented languages. We use this formalism to quantify and evaluate, on a set of benchmarks, the space overhead for a set of C++ memory layouts. In particular, this paper studies the space overhead due to three language features: virtual dispatch, virtual inheritance, and dynamic typing. To date, there has been no scientific quantification or evaluation of C++ memory layouts. Our approach can help C++ implementors. This work has already influenced the memory layout design choices in IBM's Visual Age C++ V5 compiler. Applying our approach to a set of five benchmarks, we demonstrate that the impact of object-oriented space overhead can vary dramatically between applications (ranging from 0.42% to 99.79% for our benchmarks). In particular, applications whose object space is dominated by instances of classes that heavily use object-oriented language features will be significantly impacted by the choice of a memory layout. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： object-oriented optimizations programming language implementation C plus

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