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pNOVA: Optimizing Shared File I/O Operations of NVM File System on Manycore Servers

Published: 19 August 2019 Publication History

Abstract

NOVA is a state-of-the-art non-volatile memory file system that logs on a per-file basis to ensure consistency. However, NOVA does not show scalability when multiple threads perform I/Os to a single shared file on Manycore servers. We identified two problems: First, when multiple threads write to a single file restricts parallel writes because of a coarse-grained lock on files in the file system layer. Second, when multiple threads read to a single file, every reader lock acquisition invalidates cachelines of waiting threads and block holders. In order to solve the aforementioned problems, we propose pNOVA, a variant of NOVA that accelerates parallel writes and reads to the same file of multiple threads. First, pNOVA employs a fine-grained range lock, for which we take two implementations, an interval tree based range locking and an atomic operation-based range locking, rather than a coarse-grained lock on files. Second, by defining a range locking variable per each file range, we alleviate the cacheline invalidation problem of a single read counter. Lastly, we address the potential consistency damage incurred by parallel writes to the shared file, and provide consistency using a commit mark based logging method. We evaluated pNOVA on a Manycore server with 120 cores. For microbenchmark, pNOVA showed up to 3.5× higher I/O throughput than NOVA for concurrent shared file write workload. In the Filebench-OLTP benchmark, pNOVA showed up to 1.66× higher transaction processing rate than NOVA.

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    cover image ACM Conferences
    APSys '19: Proceedings of the 10th ACM SIGOPS Asia-Pacific Workshop on Systems
    August 2019
    115 pages
    ISBN:9781450368933
    DOI:10.1145/3343737
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    Published: 19 August 2019

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    Author Tags

    1. File System
    2. Non-Volatile Memory
    3. Operating System

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    Overall Acceptance Rate 169 of 430 submissions, 39%

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