Delta Coherence Protocols: The Home Update Protocol

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We describe a new class of directory coherence protocols called delta coherence protocols that use network guarantees to support a new and highly concurrent approach to maintain a consistent shared memory. Delta coherence protocols are more concurrent than other coherence protocols in that they allow processes to pipeline memory accesses without violating sequential consistency; support multiple concurrent readers and writers to the same cache block; and allow processes to access multiple shared variables atomically without invalidating the copies held by other processes or otherwise obtaining exclusive access to the referenced variables. Delta protocols include both update and invalidate protocols. In ... continued below

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162 Kilobytes pages

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Williams, C.; Reynolds, P.F. & de Supinoki, B. July 21, 2000.

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Description

We describe a new class of directory coherence protocols called delta coherence protocols that use network guarantees to support a new and highly concurrent approach to maintain a consistent shared memory. Delta coherence protocols are more concurrent than other coherence protocols in that they allow processes to pipeline memory accesses without violating sequential consistency; support multiple concurrent readers and writers to the same cache block; and allow processes to access multiple shared variables atomically without invalidating the copies held by other processes or otherwise obtaining exclusive access to the referenced variables. Delta protocols include both update and invalidate protocols. In this paper we describe the simplest, most basic delta protocol, an update protocol called the home update protocol. Delta protocols are based on isotach network guarantees. An isotach network maintains a logical time system that allows each process to predict and control the logical time at which its messages are received. Processes use isotach guarantees to control the logical time at which their requests on shared memory appear to be executed. We prove the home update protocol is correct using logical time to reason about the order in which requests are executed.

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162 Kilobytes pages

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  • Other Information: PBD: 21 Jul 2000

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  • Report No.: UCRL-ID-139737
  • Grant Number: W-7405-Eng-48
  • DOI: 10.2172/793578 | External Link
  • Office of Scientific & Technical Information Report Number: 793578
  • Archival Resource Key: ark:/67531/metadc742283

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  • July 21, 2000

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 1:11 p.m.

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Williams, C.; Reynolds, P.F. & de Supinoki, B. Delta Coherence Protocols: The Home Update Protocol, report, July 21, 2000; California. (digital.library.unt.edu/ark:/67531/metadc742283/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.