Sysbench 进行磁盘IO测试的输出结果解读

准备数据+随机读写测试

sysbench --num-threads=16 --test=fileio --file-total-size=3G --file-test-mode=rndrw prepare



sysbench --num-threads=16 --test=fileio --file-total-size=3G --file-test-mode=rndrw run 

输出结果：#后面的是解读注释

root@wuzhou:/home/meizu/sysbench/sysbench-0.4.12# sysbench --num-threads=16 --test=fileio --file-total-size=3G --file-test-mode=rndrw run 

sysbench 0.4.12:  multi-threaded system evaluation benchmark



Running the test with following options:

Number of threads: 16                             #16个线程进行读写



Extra file open flags: 0

128 files, 24Mb each                              #3G的文件分成了128个文件，每个24Mb

3Gb total file size 

Block size 16Kb                                   #块大小16Kb Number of random requests for random IO: 10000          #随机IO请求数10000       

Read/Write ratio for combined random IO test: 1.50      #随机读写比例1.5:1

Periodic FSYNC enabled, calling fsync() each 100 requests.  

Calling fsync() at the end of test, Enabled.

Using synchronous I/O mode

Doing random r/w test             #测试模式

Threads started!

Done.



Operations performed:  6010 Read, 3998 Write, 12806 Other = 22814 Total

Read 93.906Mb  Written 62.469Mb  Total transferred 156.38Mb  (122.03Mb/sec)   #总的IO读写效率（122.03Mb/sec) 7810.19 Requests/sec executed      #7810.19/s 这个就是IOPC。每次IO读写一个block, 每个block=16K,7810*16/1024=122.03Mb. IO测试结果关注点IOPS。                               



Test execution summary:

    total time:                          1.2814s

    total number of events:              10008

    total time taken by event execution: 15.8660

    per-request statistics:

         min:                                  0.00ms

         avg:                                  1.59ms

         max:                                 14.04ms

         approx.  95 percentile:               6.04ms



Threads fairness:

    events (avg/stddev):           625.5000/24.21

    execution time (avg/stddev):   0.9916/0.01