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Cosh: Clear OS Data Sharing In An Incoherent World

Authors: 

Andrew Baumann, and Chris Hawblitzel, Microsoft Research; Kornilios Kourtis, ETH Zürich; Tim Harris, Oracle Labs; Timothy Roscoe, ETH Zürich

Abstract: 

This paper tackles the problem of providing familiar OS abstractions for I/O (such as pipes, network sockets, and a shared file system) to applications on heterogeneous cores including accelerators, co-processors, and ooad engines. We aim to isolate the implementation of these facilities from the details of a platform’s memory architecture, which is likely to include a combination of cache-coherent shared memory, non-cache-coherent shared memory, and non-shared memory, all in the same system.

We propose coherence-oblivious sharing (Cosh), a new OS abstraction that provides inter-process sharing with clear semantics on such diverse hardware. We have implemented a prototype of Cosh for the Barrelfish multikernel. We describe how to build common OS functionality using Cosh, and evaluate its performance on a heterogeneous system consisting of commodity cache-coherent CPUs and prototype Intel many-core co-processors.

Andrew Baumann, Microsoft Research

Chris Hawblitzel, Microsoft Research

Kornilios Kourtis, ETH Zürich

Tim Harris, Oracle Labs

Timothy Roscoe, ETH Zürich

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BibTeX
@inproceedings {187020,
author = {Andrew Baumann and Chris Hawblitzel and Kornilios Kourtis and Tim Harris and Timothy Roscoe},
title = {Cosh: Clear {OS} Data Sharing In An Incoherent World},
booktitle = {2014 Conference on Timely Results in Operating Systems (TRIOS 14)},
year = {2014},
address = {Broomfield, CO},
url = {https://www.usenix.org/conference/trios14/technical-sessions/presentation/baumann},
publisher = {USENIX Association},
month = oct,
}
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