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Scalable Verification of Probabilistic Networks 2019

Scalable Verification of Probabilistic Networks

引用

40th acm sigplan conference on programming language design and implementation (pldi) part of acm's Federated Computing Research conference (FCRC)

作者： Smolka, Steffen Kumar, Praveen Kahn, David M. Foster, Nate Hsu, Justin Kozen, Dexter Silva, Alexandra Cornell Univ Ithaca NY 14850 USA Carnegie Mellon Univ Pittsburgh PA 15213 USA Univ Wisconsin Madison WI USA UCL London England

ISBN: (纸本)9781450367127

This paper presents McNetKAT, a scalable tool for verifying probabilistic network programs. McNetKAT is based on a new semantics for the guarded and history-free fragment of Probabilistic NetKAT in terms of finite-state, absorbing Markov chains. This view allows the semantics of all programs to be computed exactly, enabling construction of an automatic verification tool. Domain-specific optimizations and a parallelizing backend enable McNetKAT to analyze networks with thousands of nodes, automatically reasoning about general properties such as probabilistic program equivalence and refinement, as well as networking properties such as resilience to failures. We evaluate McNetKAT's scalability using real-world topologies, compare its performance against state-of-the-art tools, and develop an extended case study on a recently proposed data center network design.

关键词： Network verification Probabilistic programming

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Thread-modular shape analysis 07

Thread-modular shape analysis

引用

conference on programming language design and implementation

作者： Gotsman, Alexey Berdine, Josh Cook, Byron Sagiv, Mooly Univ Cambridge Cambridge CB2 1TN England Microsoft Corp Redmond WA 98052 USA

ISBN: (纸本)9781595936332

We present the first shape analysis for multithreaded programs that avoids the explicit enumeration of execution-interleavings. Our approach is to automatically infer a resource invariant associated with each lock that describes the part of the heap protected by the lock. This allows us to use a sequential shape analysis on each thread. We show that resource invariants of a certain class can be characterized as least fixed points and computed via repeated applications of shape analysis only on each individual thread. Based on this approach, we have implemented a thread-modular shape analysis tool and applied it to concurrent heap-manipulating code from Windows device drivers.

关键词： abstract interpretation concurrent programming shape analysis static analysis

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implementation of complete, asynchronous, distributed garbage collection

Implementation of complete, asynchronous, distributed garbag...

引用

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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Bounded Expectations: Resource Analysis for Probabilistic Programs 2018

Bounded Expectations: Resource Analysis for Probabilistic Pr...

引用

39th acm sigplan conference on programming language design and implementation (pldi)

作者： Van Chan Ngo Carbonneaux, Quentin Hoffmann, Jan Carnegie Mellon Univ Pittsburgh PA 15213 USA Yale Univ New Haven CT 06520 USA

ISBN: (纸本)9781450356985

This paper presents a new static analysis for deriving upper bounds on the expected resource consumption of probabilistic programs. The analysis is fully automatic and derives symbolic bounds that are multivariate polynomials in the inputs. The new technique combines manual state-of-the-art reasoning techniques for probabilistic programs with an effective method for automatic resource-bound analysis of deterministic programs. It can be seen as both, an extension of automatic amortized resource analysis (AARA) to probabilistic programs and an automation of manual reasoning for probabilistic programs that is based on weakest preconditions. An advantage of the technique is that it combines the clarity and compositionality of a weakest-precondition calculus with the efficient automation of AARA. As a result, bound inference can be reduced to off-the-shelf LP solving in many cases and automatically-derived bounds can be interactively extended with standard program logics if the automation fails. Building on existing work, the soundness of the analysis is proved with respect to an operational semantics that is based on Markov decision processes. The effectiveness of the technique is demonstrated with a prototype implementation that is used to automatically analyze 39 challenging probabilistic programs and randomized algorithms. Experiments indicate that the derived constant factors in the bounds are very precise and even optimal for some programs.

关键词： probabilistic programming resource bound analysis static analysis

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Heartbeat Scheduling: Provable Efficiency for Nested Parallelism 2018

Heartbeat Scheduling: Provable Efficiency for Nested Paralle...

引用

39th acm sigplan conference on programming language design and implementation (pldi)

作者： Acar, Umut A. Chargueraud, Arthur Guatto, Adrien Rainey, Mike Sieczkowski, Filip Carnegie Mellon Univ Pittsburgh PA 15213 USA INRIA Rocquencourt France Univ Strasbourg ICube Strasbourg France CREST Bloomington IN USA

ISBN: (纸本)9781450356985

A classic problem in parallel computing is to take a high-level parallel program written, for example, in nested-parallel style with fork-join constructs and run it efficiently on a real machine. The problem could be considered solved in theory, but not in practice, because the overheads of creating and managing parallel threads can overwhelm their benefits. Developing efficient parallel codes therefore usually requires extensive tuning and optimizations to reduce parallelism just to a point where the overheads become acceptable. In this paper, we present a scheduling technique that delivers provably efficient results for arbitrary nested-parallel programs, without the tuning needed for controlling parallelism overheads. The basic idea behind our technique is to create threads only at a beat (which we refer to as the "heartbeat") and make sure to do useful work in between. We specify our heartbeat scheduler using an abstract-machine semantics and provide mechanized proofs that the scheduler guarantees low overheads for all nested parallel programs. We present a prototype C++ implementation and an evaluation that shows that Heartbeat competes well with manually optimized Cilk Plus codes, without requiring manual tuning.

关键词： parallel programming languages granularity control

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Static array storage optimization in MATLAB 03

引用

conference on programming language design and implementation

作者： Joisha, PG Banerjee, P Northwestern Univ ECE Dept Evanston IL 60208 USA

ISBN: (纸本)9781581136623

An adaptation of the classic register allocation algorithm to the problem of array storage optimization in MATLAB is presented. The method involves the decomposition of an interference graph's color classes using inferred type information. A key trait is the use of symbolic types, along with control flow, in performing the decomposition. On a benchmark suite spanning the published test suites of some recent research MATLAB compilers, our implementation produces savings in the average virtual memory size, with respect to code generated by a commercial MATLAB compiler, of between 51% and 139% in 6 out of 11 programs, and savings between 0.7% and 47% in the remaining. In absolute terms, this ranged from 123KB to over 9MB. Substantial improvements in other categories of memory, such as resident sets and dynamic data (stack plus heap), were also observed and are reported. Speedups in execution times of at least over an order of magnitude in 4 programs, of over 100% in 4 of the remaining, and 10% and over in-the rest are also reported.

关键词： algorithms design languages performance

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A Study of Real-World Data Races in Golang 2022

A Study of Real-World Data Races in Golang

引用

43rd acm sigplan International conference on programming language design and implementation (pldi)

作者： Chabbi, Milind Ramanathan, Murali Krishna Uber Technol Inc Programming Syst Grp Sunnyvale CA 94086 USA

ISBN: (纸本)9781450392655

The concurrent programming literature is rich with tools and techniques for data race detection. Less, however, has been known about real-world, industry-scale deployment, experience, and insights about data races. Golang (Go for short) is a modern programming language that makes concurrency a first-class citizen. Go offers both message passing and shared memory for communicating among concurrent threads. Go is gaining popularity in modern microservice-based systems. Data races in Go stand in the face of its emerging popularity. In this paper, using our industrial codebase as an example, we demonstrate that Go developers embrace concurrency and show how the abundance of concurrency alongside language idioms and nuances make Go programs highly susceptible to data races. Google's Go distribution ships with a built-in dynamic data race detector based on ThreadSanitizer. However, dynamic race detectors pose scalability and flakiness challenges;we discuss various software engineering trade-offs to make this detector work effectively at scale. We have deployed this detector in Uber's 46 million lines of Go codebase hosting 2100 distinct microservices, found over 2000 data races, and fixed over 1000 data races, spanning 790 distinct code patches submitted by 210 unique developers over a six-month period. Based on a detailed investigation of these data race patterns in Go, we make seven high-level observations relating to the complex interplay between the Go language paradigm and data races.

关键词： Data race Golang Dynamic analysis

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MAPL 2019 - Proceedings of the 3rd acm sigplan International Workshop on Machine Learning and programming languages, co-located with pldi 2019

MAPL 2019 - Proceedings of the 3rd ACM SIGPLAN International...

引用

3rd acm sigplan International Workshop on Machine Learning and programming languages, MAPL 2019, co-located with pldi 2019

ISBN: (纸本)9781450367196

The proceedings contain 5 papers. The topics discussed include: machine learning in python with no strings attached;triton: an intermediate language and compiler for tiled neural network computations;HackPPL: a universal probabilistic programming language;neural query expansion for code search;and a case study on machine learning for synthesizing benchmarks.

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PyLSE: A Pulse-Transfer Level language for Superconductor Electronics 2022

PyLSE: A Pulse-Transfer Level Language for Superconductor El...

引用

43rd acm sigplan International conference on programming language design and implementation (pldi)

作者： Christensen, Michael Tzimpragos, Georgios Kringen, Harlan Volk, Jennifer Sherwood, Timothy Hardekopf, Ben UC Santa Barbara Santa Barbara CA 93106 USA UC Santa Barbara Dept Elect & Comp Engn Santa Barbara CA USA

ISBN: (纸本)9781450392655

Superconductor electronics (SCE) run at hundreds of GHz and consume only a fraction of the dynamic power of CMOS, but are naturally pulse-based, and operate on impulses with picosecond widths. The transiency of these operations necessitates using logic cells that are inherently stateful. Adopting stateful gates, however, implies an entire reconstruction of the design, simulation, and verification stack. Though challenging, this unique opportunity allows us to build a design framework from the ground up using fundamental principles of programming language design. To this end, we propose PyLSE, an embedded pulse-transfer level language for superconductor electronics. We define PyLSE through formal semantics based on transition systems, and build a framework around them to simulate and analyze SCE cells digitally. To demonstrate its features, we verify its results by model checking in UPPAAL, and compare its complexity and timing against a set of cells designed as analog circuit schematics and simulated in Cadence.

关键词： superconductor electronics hardware description language timed automata

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Aggressive inlining

Aggressive inlining

引用

sigplan 97 conference on programming language design and implementation

作者： Ayers, A Gottlieb, R Schooler, R Hewlett-Packard Massachusetts Language Lab Chelmsford United States

Existing research understates the benefits that can be obtained from inlining and cloning, especially when guided by profile information. Our implementation of inlining and cloning yields excellent results on average and very rarely lowers performance. We believe our good results can be explained by a number of factors: inlining at the intermediate-code level removes most technical restrictions on what can be inlined;the ability to inline across files and incorporate profile information enables us to choose better inline candidates;a high-quality back end can exploit the scheduling and register allocation opportunities presented by larger subroutines;an aggressive processor architecture benefits from more predictable branch behavior;and a large instruction cache mitigates the impact of code expansion. We describe the often dramatic impact of our inlining and cloning on performance: for example, the implementations of our inlining and cloning algorithms in the HP-UX 10.20 compilers boost SPECint95 performance on a PA8000-based workstation by a factor of 1.32.

关键词： Computer programming

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