Programming with transactional coherence and consistency (TCC)

Author:

Hammond Lance1,Carlstrom Brian D.1,Wong Vicky1,Hertzberg Ben1,Chen Mike1,Kozyrakis Christos1,Olukotun Kunle1

Affiliation:

1. Stanford University, Stanford, CA

Abstract

Transactional Coherence and Consistency (TCC) offers a way to simplify parallel programming by executing all code within transactions. In TCC systems, transactions serve as the fundamental unit of parallel work, communication and coherence. As each transaction completes, it writes all of its newly produced state to shared memory atomically, while restarting other processors that have speculatively read stale data. With this mechanism, a TCC-based system automatically handles data synchronization correctly, without programmer intervention. To gain the benefits of TCC, programs must be decomposed into transactions. We describe two basic programming language constructs for decomposing programs into transactions, a loop conversion syntax and a general transaction-forking mechanism. With these constructs, writing correct parallel programs requires only small, incremental changes to correct sequential programs. The performance of these programs may then easily be optimized, based on feedback from real program execution, using a few simple techniques.

Publisher

Association for Computing Machinery (ACM)

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