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Tradeoffs Between False Sharing and Aggregation in Software Distributed Shared Memory by Cristiana Amza; Alan Cox; Karthick Rajamani; Willy Zwaenepoel is a Computer Science article available to read on EtoBox.

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Software Distributed Shared Memory (DSM) systems based on virtual memory techniques traditionally use the hardware page as the consistency unit. The large size of the hardware page is considered to be a performance bottleneck because of the implied false sharing overheads. Instead, we show that in the presence of a relaxed consistency model and a multiple writer protocol, a large consistency unit is generally not detrimental to performance. We study the tradeoffs between false sharing and aggregation effects when using large consistency units. In this context, this paper makes three separate contributions:1. We document the cost of false sharing in terms of extra messages and extra data being communicated. We find that, for the applications considered, when the virtual memory page is used as the consistency unit, the number of extra messages is small, while the amount of extra data can be substantial.2. We evaluate the performance when the consistency unit is increased to a multiple of the virtual memory page size. For most applications and data sets, the performance improves, except when the false sharing effects include extra messages or a large amount of extra data.3. We present

Who reads Tradeoffs Between False Sharing and Aggregation in Software Distributed Shared Memory?

Author

Cristiana Amza; Alan Cox; Karthick Rajamani; Willy Zwaenepoel

Publisher

ACM

Published

1997

Language

EN

Field

Computer Science (Physical Sciences)