大佬教程收集整理的这篇文章主要介绍了linux – 以编程方式测量磁盘IO，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我需要知道：
>写入磁盘的块数
>从磁盘读取的块数
>从磁盘读取但在磁盘高速缓存中找到的块数
>要写入磁盘但尚未写入的块数,以了解我可能期望的IO数量.
如果我只通过磁盘或分区获取此信息……这甚至更好,因为我不需要知道我从proc读取了多少信息.
如果我还知道这个过程等待IO完成的时间……甚至更好.
文件中的一行如下所示：
8 0 sda 1576985 366566 29817737 8671588 4847477 21489330 210704848 14116392 0 14120880 22772188
从/usr/src/linux-*/Documentation/iostats.txt开始：
Field 1 -- # of reads completed
This is the @R_89_10586@l number of reads completed successfully.
Field 2 -- # of reads merged,field 6 -- # of writes merged
Reads and writes which are adjacent to each other may be merged for
efficiency. Thus two 4K reads may become one 8K read before it is
ultimately handed to the disk,and so it will be counted (and queued)
as only one I/O. This field lets you kNow how often this was done.
Field 3 -- # of sectors read
This is the @R_89_10586@l number of sectors read successfully.
Field 4 -- # of milliseconds spent reading
This is the @R_89_10586@l number of milliseconds spent by all reads (as
measured from __make_request() to end_that_request_last()).
Field 5 -- # of writes completed
This is the @R_89_10586@l number of writes completed successfully.
Field 6 -- # of writes merged
See the description of field 2.
Field 7 -- # of sectors written
This is the @R_89_10586@l number of sectors written successfully.
Field 8 -- # of milliseconds spent wriTing
This is the @R_89_10586@l number of milliseconds spent by all writes (as
measured from __make_request() to end_that_request_last()).
Field 9 -- # of I/Os currently in progress
The only field that should go to zero. Incremented as requests are
given to appropriate struct request_queue and decremented as they finish.
Field 10 -- # of milliseconds spent doing I/Os
This field increases so long as field 9 is nonzero.
Field 11 -- weighted # of milliseconds spent doing I/Os
This field is incremented at each I/O start,I/O completion,I/O
merge,or read of these stats by the number of I/Os in progress
(field 9) times the number of milliseconds spent doing I/O since the
last update of this field. This can provide an easy measure of both
I/O completion time and the BACklog that may be accumulaTing.
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