统计进程的io读写

最新推荐文章于 2025-01-20 14:08:17 发布

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最新推荐文章于 2025-01-20 14:08:17 发布 · 2.9k 阅读

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本文介绍了如何通过/proc/[pid]/io文件查看Linux进程的I/O统计信息，包括读写字节数、系统调用次数等，并通过实例验证了统计的准确性。通过观察进程的I/O行为，有助于理解系统的存储性能。

在/proc/[pid]/io文件里面为我们提供了这个接口。还是先看manpage:

/proc/[pid]/io (since kernel 2.6.20)
This file contains I/O statistics for the process, for example:

                  # cat /proc/3828/io
                  rchar: 323934931
                  wchar: 323929600
                  syscr: 632687
                  syscw: 632675
                  read_bytes: 0
                  write_bytes: 323932160
                  cancelled_write_bytes: 0

The fields are as follows:

              rchar: characters read
                     The number of bytes which this task has caused to be read from storage. This is simply the sum of bytes which
                 &n