NDLI: Shared Memory Consistency Conditions for Nonsequential Execution: Definitions and Programming Strategies

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Shared Memory Consistency Conditions for Nonsequential Execution: Definitions and Programming Strategies

Content Provider	Society for Industrial and Applied Mathematics (SIAM)
Author	Chaudhuri, Soma Friedman, Roy Welch, Jennifer L. Attiya, Hagit
Copyright Year	1998
Abstract	To enhance performance on shared memory multiprocessors, various techniques have been proposed to reduce the latency of memory accesses, including pipelining of accesses, out-of-order execution of accesses, and branch prediction with speculative execution. These optimizations can, however, complicate the user's model of memory. This paper attacks the problem of simplifying programming on two fronts.First, a general framework is presented for defining shared memory consistency conditions that allows nonsequential execution of memory accesses. The interface at which conditions are defined is between the program and the system and is architecture-independent. The framework is used to generalize three consistency conditions---sequential consistency, hybrid consistency, and weak consistency---for nonsequential execution. Thus, familiar consistency conditions can be precisely specified even in optimized architectures.Second, three techniques are described for structuring programs so that a shared memory that provides the weaker (and more efficient) condition of hybrid consistency appears to guarantee the stronger (and more costly) condition of sequential consistency. The benefit of these techniques is that sequentially consistent executions are easier to reason about. The first technique statically classifies accesses based on their type. This approach is extremely simple to use and leads to a general technique for writing efficient synchronization code. The third technique is to avoid data races in the program, which was previously studied in a somewhat different setting.Precise, yet short and comprehensible, proofs are provided for the correctness of the programming techniques. Such proofs shed light on the reasons these techniques work; we believe that the insight gained can lead to the development of other techniques.
Starting Page	65
Ending Page	89
Page Count	25
File Format	PDF
ISSN	00975397
DOI	10.1137/S0097539794278396
e-ISSN	10957111
Journal	SIAM Journal on Computing (SMJCAT)
Issue Number	1
Volume Number	27
Language	English
Publisher	Society for Industrial and Applied Mathematics
Publisher Date	2006-07-28
Access Restriction	Subscribed
Subject Keyword	sequential consistency Specification and verification Modes of computation Research exposition distributed shared memory consistency conditions Abstract data types; algebraic specification Mathematical problems of computer architecture
Content Type	Text
Resource Type	Article
Subject	Mathematics Computer Science

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