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PADS/ML: A functional data description language 07

PADS/ML: A functional data description language

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34th acm sigplan-SIGACT Symposium on Principles of programming languages

作者： Mandelbaum, Yitzhak Fisher, Kathleen Walker, David Fernandez, Mary Gleyzer, Artem Princeton Univ Princeton NJ 08544 USA

ISBN: (纸本)9781595935755

Massive amounts of useful data are stored and processed in ad hoc formats for which common tools like parsers, printers, query engines and format converters are not readily available. In this paper, we explain the design and implementation of PADS/ML, a new language and system that facilitates the generation of data processing tools for ad hoc formats. The PADS/ML design includes features such as dependent, polymorphic and recursive datatypes, which allow programmers to describe the syntax and semantics of ad hoc data in a concise, easy-to-read notation. The PADS/ML implementation compiles these descriptions into ML structures and functors that include types for parsed data, functions for parsing and printing, and auxiliary support for user-specified, format-dependent and format-independent tool generation.

关键词： languages data description languages domain-specific languages functional programming dependent types ML modules parsing printing

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Sound Probabilistic Inference via Guide Types 2021

Sound Probabilistic Inference via Guide Types

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42nd acm sigplan International conference on programming language design and implementation (PLDI)

作者： Wang, Di Hoffmann, Jan Reps, Thomas Carnegie Mellon Univ Pittsburgh PA 15213 USA Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450383912

Probabilistic programming languages aim to describe and automate Bayesian modeling and inference. Modern languages support programmable inference, which allows users to customize inference algorithms by incorporating guide programs to improve inference performance. For Bayesian inference to be sound, guide programs must be compatible with model programs. One pervasive but challenging condition for model-guide compatibility is absolute continuity, which requires that the model and guide programs define probability distributions with the same support. This paper presents a new probabilistic programming language that guarantees absolute continuity, and features general programming constructs, such as branching and recursion. Model and guide programs are implemented as coroutines that communicate with each other to synchronize the set of random variables they sample during their execution. Novel guide types describe and enforce communication protocols between coroutines. If the model and guide are well-typed using the same protocol, then they are guaranteed to enjoy absolute continuity. An efficient algorithm infers guide types from code so that users do not have to specify the types. The new programming language is evaluated with an implementation that includes the type-inference algorithm and a prototype compiler that targets Pyro. Experiments show that our language is capable of expressing a variety of probabilistic models with nontrivial control flow and recursion, and that the coroutine-based computation does not introduce significant overhead in actual Bayesian inference.

关键词： Probabilistic programming Bayesian inference type systems coroutines

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Executing Code in the Past: Efficient In-Memory Object Graph Versioning 09

Executing Code in the Past: Efficient In-Memory Object Graph...

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24th Annual acm conference on Object-Oriented programming, Systems, languages and Applications

作者： Pluquet, Frederic Langerman, Stefan Wuyts, Roel Univ Libre Bruxelles Dept Comp Sci Fac Sci Brussels Belgium

ISBN: (纸本)9781605587349

Object versioning refers to how an application can have access to previous states of its objects Implementing this mechanism is hard because it needs to be efficient in space and time, and well integrated with the programming language. This paper presents HistOOry, an object versioning system that uses an efficient data structure to store and retrieve past states. It needs only three primitives, and existing code does not need to be modified to be versioned It provides fine-grained control over what parts of objects are versioned and when It stores all states, past and present, in memory. Code can be executed in the past of the system and will see the complete system at that point in time. We have implemented our model in Smalltalk and used it for three applications that need versioning: checked postconditions, stateful execution tracing and a planar point location implementation. Benchmarks are provided to asses the practical complexity of our implementation.

关键词： Object Versioning Object-oriented programming language design

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Parcae: A System for Flexible Parallel Execution 12

Parcae: A System for Flexible Parallel Execution

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33rd acm sigplan conference on programming language design and implementation

作者： Raman, Arun Zaks, Ayal Lee, Jae W. August, David I. Intel Res Santa Clara CA USA Intel Corp Haifa Israel Sungkyunkwan Univ Suwon South Korea Princeton Univ Princeton NJ 08544 USA

ISBN: (纸本)9781450312059

Workload, platform, and available resources constitute a parallel program's execution environment. Most parallelization efforts statically target an anticipated range of environments, but performance generally degrades outside that range. Existing approaches address this problem with dynamic tuning but do not optimize a multiprogrammed system holistically. Further, they either require manual programming effort or are limited to array-based data-parallel programs. This paper presents Parcae, a generally applicable automatic system for platform-wide dynamic tuning. Parcae includes (i) the Nona compiler, which creates flexible parallel programs whose tasks can be efficiently reconfigured during execution;(ii) the Decima monitor, which measures resource availability and system performance to detect change in the environment;and (iii) the Morta executor, which cuts short the life of executing tasks, replacing them with other functionally equivalent tasks better suited to the current environment. Parallel programs made flexible by Parcae outperform original parallel implementations in many interesting scenarios.

关键词： design Performance automatic parallelization code generation compiler flexible multicore parallel performance portability run-time adaptivity tuning

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Grammatical abstraction and incremental syntax analysis in a language-based editor 88

Grammatical abstraction and incremental syntax analysis in a...

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acm sigplan conference on programming language design and implementation, PLDI 1988

作者： Baillance, Robert A. Butcher, Jacob Graham, Susan L. Computer Science Division-EECS University of California BerkeleyCA94 720 United States Department of Computer Science University of New Mexico AlbuquerqueNM87131 United States

ISBN: (纸本)0897912691

Processors for programming languages and other formal languages typically use a concrete syntax to describe the user's view of a program and an abstract syntax to represent language structures internally. Grammatical abstraction is defined as a relationship between two context-free grammars. It formalizes the notion of one syntax being "more abstract" than another. Two variants of abstraction are presented. Weak grammatical abstraction supports (i) the construction during LR parsing of an internal representation that is closely related to the abstract syntax and (ii) incremental LR parsing using that internal representation as its base, Strong grammatical abstraction tightens the correspondence so that top-down construction of incrementally-parsable internal representations is possible. These results arise from an investigation into language-based editing systems, but apply to any program that transforms a linguistic object from a representation in its concrete syntax to, a representation in its abstract syntax or vice versa. © 1988 acm.

关键词： Context free grammars

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Commutative Set: A language Extension for Implicit Parallel programming 11

Commutative Set: A Language Extension for Implicit Parallel ...

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32nd acm sigplan conference on programming language design and implementation (PLDI 11)

作者： Prabhu, Prakash Ghosh, Soumyadeep Zhang, Yun Johnson, Nick P. August, David I. Princeton Univ Princeton NJ 08544 USA

ISBN: (纸本)9781450306638

Sequential programming models express a total program order, of which a partial order must be respected. This inhibits parallelizing tools from extracting scalable performance. Programmer written semantic commutativity assertions provide a natural way of relaxing this partial order, thereby exposing parallelism implicitly in a program. Existing implicit parallel programming models based on semantic commutativity either require additional programming extensions, or have limited expressiveness. This paper presents a generalized semantic commutativity based programming extension, called Commutative Set (COMMSET), and associated compiler technology that enables multiple forms of parallelism. COMMSET expressions are syntactically succinct and enable the programmer to specify commutativity relations between groups of arbitrary structured code blocks. Using only this construct, serializing constraints that inhibit parallelization can be relaxed, independent of any particular parallelization strategy or concurrency control mechanism. COMMSET enables well performing parallelizations in cases where they were inapplicable or non-performing before. By extending eight sequential programs with only 8 annotations per program on average, Comm S ET and the associated compiler technology produced a geomean speedup of 5.7x on eight cores compared to 1.5x for the best non-COMMSET parallelization.

关键词： Implicit parallelism semantic commutativity programming model automatic parallelization static analysis

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SELECTIVE SPECIALIZATION FOR OBJECT-ORIENTED languageS 95

SELECTIVE SPECIALIZATION FOR OBJECT-ORIENTED LANGUAGES

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acm sigplan 95 conference on programming language design and implementation

作者： DEAN, J CHAMBERS, C GROVE, D Department of Computer Science and Engineering University of Washington Seattle WA

ISBN: (纸本)9780897916974

Dynamic dispatching is a major source of run-time overhead in object-oriented languages, due both to the direct cost of method lookup and to the indirect effect of preventing other optimizations. To reduce this overhead, optimizing compilers for object-oriented languages analyze the classes of objects stored in program variables, with the goal of bounding the possible classes of message receivers enough so that the compiler can uniquely determine the target of a message send at compile time and replace the message send with a direct procedure call. Specialization is one important technique for improving the precision of this static class information: by compiling multiple versions of a method, each applicable to a subset of the possible argument classes of the method, more precise static information about the classes of the method's arguments is obtained. Previous specialization strategies have not been selective about where this technique is applied, and therefore tended to significantly increase compile time and code space usage, particularly for large applications. In this paper, we present a more general framework for specialization in object-oriented languages and describe a goal-directed specialization algorithm that makes selective decisions to apply specialization to those cases where;it provides the highest benefit. Our results show that our algorithm improves the performance of a group of sizeable programs by 65% to 275% while increasing compiled code space requirements by only 4% to 10%. Moreover, when compared to the previous state-of-the-art specialization scheme, our algorithm improves performance by 11% to 67% while simultaneously reducing code space requirements by 65% to 73%.

关键词： Object oriented programming

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implementation of complete, asynchronous, distributed garbage collection

Implementation of complete, asynchronous, distributed garbag...

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Proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Le Fessant, Fabrice Piumarta, Ion Shapiro, Marc INRIA Roquencourt Le Chesnay France

Most existing reference-based distributed object systems include some kind of acyclic garbage collection, but fail to provide acceptable collection of cyclic garbage. Those that do provide such GC currently suffer from one or more problems: synchronous operation, the need for expensive global consensus or termination algorithms, susceptibility to communication problems, or an algorithm that does not scale. We present a simple, complete, fault-tolerant, asynchronous extension to the (acyclic) cleanup protocol of the SSP Chains system. This extension is scalable, consumes few resources, and could easily be adapted to work in other reference-based distributed object systems - rendering them usable for very large-scale applications.

关键词： Computer systems programming

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Efficient discovery of regular stride patterns in irregular programs and its use in compiler prefetching

Efficient discovery of regular stride patterns in irregular ...

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conference on programming language design and implementation (PLDI 02)

作者： Wu, YF Intel Labs Programming Syst Res Santa Clara CA 95052 USA

Irregular data references are difficult to prefetch, as the future memory address of a load instruction is hard to anticipate by a compiler. However, recent studies as well as our experience indicate that some important load instructions in irregular programs contain stride access patterns. Although the load instructions with stride patterns are difficult to identify with static compiler techniques, we developed an efficient profiling method to discover these load instructions. The new profiling method integrates the profiling for stride information and the traditional profiling for edge frequency into a single profiling pass. The integrated profiling pass runs only 17% slower than the frequency profiling alone. The collected stride information helps the compiler to identify load instructions with stride patterns that can be prefetched efficiently and beneficially. We implemented the new profiling and prefetching techniques in a research compiler for Itanium(TM) Processor Family (IPF), and obtained significant performance improvement for the SPECINT2000 programs running on Itanium machines. For example, we achieved a 1.59x speedup for *** 1.14x for ***, and 1.08x for ***. We also showed that the performance gain is stable across input data sets. These benefits make the new profiling and prefetching techniques suitable for production compilers.

关键词： languages performance design experimentation algorithms integrated stride and frequency profiling data prefetching strongly single-strided loads phased multi-strided loads performance evaluation

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Predictable Accelerator design with Time-Sensitive Affine Types 2020

Predictable Accelerator Design with Time-Sensitive Affine Ty...

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41st acm sigplan conference on programming language design and implementation (PLDI)

作者： Nigam, Rachit Atapattu, Sachille Thomas, Samuel Li, Zhijing Bauer, Theodore Ye, Yuwei Koti, Apurva Sampson, Adrian Zhang, Zhiru Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9781450376136

Field-programmable gate arrays (FPGAs) provide an opportunity to co-design applications with hardware accelerators, yet they remain difficult to program. High-level synthesis (HLS) tools promise to raise the level of abstraction by compiling C or C++ to accelerator designs. Repurposing legacy software languages, however, requires complex heuristics to map imperative code onto hardware structures. We find that the black-box heuristics in HLS can be unpredictable: changing parameters in the program that should improve performance can counterintuitively yield slower and larger designs. This paper proposes a type system that restricts HLS to programs that can predictably compile to hardware accelerators. The key idea is to model consumable hardware resources with a time-sensitive affine type system that prevents simultaneous uses of the same hardware structure. We implement the type system in Dahlia, a language that compiles to HLS C++, and show that it can reduce the size of HLS parameter spaces while accepting Pareto-optimal designs.

关键词： Affine Type Systems High-Level Synthesis

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