sysbench测试磁盘IO（sysbench测试结果分析）

系统：CentOS 7.4

工具：sysbench 1.0.17

测试IO性能分三个阶段：准备阶段、运行阶段和清理阶段

准备阶段：

# sysbench --file-num=20 --threads=20 --file-total-size=100G --events=1000000 --file-test-mode=rndrw prepare sysbench 1.0.17 (using system LuaJIT 2.0.4) FATAL: Cannot find benchmark 'prepare': no such built-in test, file or module [root@server-254-163 ~]#  [root@server-254-163 ~]#  [root@server-254-163 ~]# sysbench --file-num=20 --threads=20 fileio --file-total-size=20G --events=1000000 --file-test-mode=rndrw prepare sysbench 1.0.17 (using system LuaJIT 2.0.4) 20 files, 1048576Kb each, 20480Mb total Creating files for the test... Extra file open flags: (none) Creating file test_file.0 Creating file test_file.1 Creating file test_file.2 Creating file test_file.3 Creating file test_file.4 Creating file test_file.5 Creating file test_file.6 Creating file test_file.7 Creating file test_file.8 Creating file test_file.9 Creating file test_file.10 Creating file test_file.11 Creating file test_file.12 Creating file test_file.13 Creating file test_file.14 Creating file test_file.15 Creating file test_file.16 Creating file test_file.17 Creating file test_file.18 Creating file test_file.19 21474836480 bytes written in 104.50 seconds (195.98 MiB/sec).

运行阶段：

# sysbench --file-num=20 --threads=20 fileio --file-total-size=20G --events=1000000 --file-test-mode=rndrw run sysbench 1.0.17 (using system LuaJIT 2.0.4) Running the test with following options: Number of threads: 20 Initializing random number generator from current time Extra file open flags: (none) 20 files, 1GiB each 20GiB total file size Block size 16KiB Number of IO requests: 1000000 Read/Write ratio for combined random IO test: 1.50 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 Initializing worker threads... Threads started! File operations:     reads/s:                      13448.73     writes/s:                     8965.95     fsyncs/s:                     4522.55 Throughput:     read, MiB/s:                  210.14     written, MiB/s:               140.09 General statistics:     total time:                          10.0038s     total number of events:              269178 Latency (ms):          min:                                    0.00          avg:                                    0.74          max:                                   20.33          95th percentile:                        5.47          sum:                               199496.81 Threads fairness:     events (avg/stddev):           13458.9000/333.61     execution time (avg/stddev):   9.9748/0.00

清理阶段：

sysbench --file-num=20 --threads=20 fileio --file-total-size=20G --events=1000000 --file-test-mode=rndrw cleanup sysbench 1.0.17 (using system LuaJIT 2.0.4) Removing test files...