Evaluation of Ext4 Write Latency for Real Time Systems

• Item type: Symposium(1)
• 公開日: 2018-12-25
• タイトル: Evaluation of Ext4 Write Latency for Real Time Systems
• タイトル / 言語: en
• タイトル: Evaluation of Ext4 Write Latency for Real Time Systems
• 言語: eng
• 資源タイプ / 資源タイプ識別子: http://purl.org/coar/resource_type/c_5794
• 資源タイプ: conference paper
• 著者所属: Information Technology R&D Center, Mitsubishi Electric Corporation
• 著者所属: Information Technology R&D Center, Mitsubishi Electric Corporation
• 著者所属(英): en
• 著者所属(英): Information Technology R&D Center, Mitsubishi Electric Corporation
• 著者所属(英): en
• 著者所属(英): Information Technology R&D Center, Mitsubishi Electric Corporation
• 著者名: Ryo, Okabe; Masakatsu, Toyama
• 著者名(英): Ryo, Okabe; Masakatsu, Toyama
• 論文抄録 / 内容記述タイプ: Other
• 論文抄録 / 内容記述: In some embedded systems, the latency of the file system's write() operation is required to be on the order of sub-milliseconds. However, the latency exceeds a millisecond when a storage access occurs inside write(). Although a pre-allocation step is known to eliminate these accesses, we need to confirm its effect. Furthermore, we need to determine whether there are other write() operations whose latency also exceed a millisecond. We evaluated the latency of the Ext4 write() operation using pre-allocation. The results show that pre-allocation is effective in eliminating storage accesses. We also found that the latency exceeded a millisecond due to journaling when another file was operated. Further studies are needed to address this latency.
• 論文抄録(英) / 内容記述タイプ: Other
• 論文抄録(英) / 内容記述: In some embedded systems, the latency of the file system's write() operation is required to be on the order of sub-milliseconds. However, the latency exceeds a millisecond when a storage access occurs inside write(). Although a pre-allocation step is known to eliminate these accesses, we need to confirm its effect. Furthermore, we need to determine whether there are other write() operations whose latency also exceed a millisecond. We evaluated the latency of the Ext4 write() operation using pre-allocation. The results show that pre-allocation is effective in eliminating storage accesses. We also found that the latency exceeded a millisecond due to journaling when another file was operated. Further studies are needed to address this latency.
• 書誌情報: Proceedings of Asia Pacific Conference on Robot IoT System Development and Platform; 巻 2018, p. 36-37, 発行日 2018-12-25
• 出版者 / 言語: ja
• 出版者: 情報処理学会