A high resolution disk I/O trace system

Authors:
Tao Huang;Teng Xu;Xianliang Lu
Affiliations:
University of Electronic Science and Technology of China, Chengdu, 610054, P.R.China;University of Electronic Science and Technology of China, Chengdu, 610054, P.R.China;University of Electronic Science and Technology of China, Chengdu, 610054, P.R.China
Venue:
ACM SIGOPS Operating Systems Review
Year:
2001

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Abstract

Disk access patterns are more important to understand as the gap between processor and disk performance is increasing. Obtaining disk I/O traces from real system is the first step to analyze disk access patterns, and tracing disk I/O is the first step to obtain disk I/O traces from real system. This paper implements a high resolution disk I/O trace system built into Linux, without adding noticeable processor load to the system. Each trace record contains the following content about a single physical I/O to a specified disk: timings (including start and completion time) to 1 µ s resolution, disk number and partition, start address, transfer size, flags for read/write, and the type of block accessed.