s
total number of events: 262144
total time taken by event execution: 0.3994s
response time:
min: 0.00ms
avg: 0.00ms
max: 0.11ms
approx. 95 percentile: 0.00ms
Threads fairness:
events (avg/stddev): 262144.0000/0.00
execution time (avg/stddev): 0.3994/0.00
内存OPS：
![这里写图片描述](https://www.cppentry.com/upload_files/article/57/1_9gqdj__.png "\")
数字的谎言！
前一个测试报告在8MB块大小时读速度1.8TB/s
32MB块大小时读速度上升到7.2TB/s
恒定的OPS是真正的读瓶颈。 内存写OPS：
![这里写图片描述](https://www.cppentry.com/upload_files/article/57/1_jrjzj__.png "\") 内存写带宽MB/S：
![这里写图片描述](https://www.cppentry.com/upload_files/article/57/1_infoa__.png "\") Sysbench 文件IO测试 IO测试包括两个阶段： 准备：在文件系统中创建文件 运行：在之前创建的文件上执行测试 支持测试的I/O模式( ?file-test-mode)，包括： seqwr : 顺序写 seqrewr : 顺序重写 seqrd : 顺序读 rndrd : 随机读 rndwr : 随机写 rndrw : 随机读/写 其它选项： --file-num : 文件数量
--file-block-size：文件块大小
--file-total-size : 所有合并的文件
--file-io-mode : sync , async, mmap
--file-extra-flags (odirect)
--file-fsync-freq : fsync()的频率
--file-fsync-all
--file-rw-ratio : rndrw模式中的R/W比例
准备文件： $ sysbench --test=fileio --file-num=4 --file-total-size=1G prepare
4 files, 262144Kb each, 1024Mb total
Creating files for the test...
Extra file open flags: 0
Creating file test_file.0
Creating file test_file.1
Creating file test_file.2
Creating file test_file.3
1073741824 bytes written in 40.32 seconds (25.40 MB/sec).
执行测试1（文件数1，顺序重写，文件块大小4K）： sysbench --test=fileio --file-num=1 --file-total-size=2G --file-fsync-all=on --file-test-mode=seqrewr --max-time=100 ?file-block-size=4096 --max-requests=0 run
Number of threads: 1
Extra file open flags: 0
1 files, 2Gb each
2Gb total file size
Block size 4Kb
Calling fsync() after each write operation.
Using synchronous I/O mode
Doing sequential rewrite test
Operations performed: 0 Read, 524288 Write, 524288 Other = 1048576 Total
Read 0b Written 2Gb Total transferred 2Gb (52.616Mb/sec)
13469.70 Requests/sec executed
Test execution summary:
total time: 38.9235s
total number of events: 524288
total time taken by event execution: 38.2213
per-request statistics:
min: 0.06ms
avg: 0.07ms
max: 8.60ms
approx. 95 percentile: 0.12ms
执行测试2（文件数29，随机读写，文件块大小16K）： sysbench --test=fileio --file-num=29 --file-total-size=290G --file-fsync-all=on --file-test-mode=rndrw --max-time=100 --file-block-size=16384 --max-requests=0 run
Number of threads: 1
Extra file open flags: 0
29 files, 10Gb each
290Gb total file size
Block size 16Kb
Number of random requests for random IO: 0
Read/Write ratio for combined random IO test: 1.50
Calling fsync() after each write operation.
Using synchronous I/O mode
Doing random r/w test
Operations performed: 449824 Read, 299883 Write, 299883 Other = 1049590 Total
Read 6.8638Gb Written 4.5759Gb Total transferred 11.44Gb (117.14Mb/sec)
7497.05 Requests/sec executed
Test execution summary:
total time: 100.0003s
total number of events: 749707
total time taken by event execution: 98.9223
per-request statistics:
min: 0.01ms
avg: 0.13ms
max: 7.34ms
approx. 95 percentile: 0.16ms
执行测试3（文件数29，随机读写，读写比率为4，文件块大小16K，线程数8）： sysbench --num-threads=8 --test=fileio --file-num=29 ?file-total-size=290G --file-fsync-all=on --file-test-mode=rndrw --max-time=100 --file-rw-ratio=4 --file-block-size=16384 --max-requests=0 run
Number of threads: 8
Extra file open flags: 0
29 files, 10Gb each
290Gb total file size
Block size 16Kb
Number of random requests for random IO: 0
Read/Write ratio for combined random IO test: 4.00
Calling fsync() after each write operation.
Using synchronous I/O mode
Doing random r/w test
Operations performed: 1734215 Read, 433552 Write, 433552 Other = 2601319 Total
Read 26.462Gb Written 6.61
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