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fio 是一个 I/O 工具用来对硬件进行压力测试和验证，支持13种不同的I/O引擎，包括：sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio 等等, I/O priorities (for newer Linux kernels), rate I/O, 进程或者线程作业等等
fio 2.0.15 改进记录：
- adds an --eta-newline option to insert ETA new line at fixed intervals.
- Fixes for the CPU clock, notably PPC.
- Fixes for workloads with read/write file locking.
- A fix for skewed latencies with rated IOPS.
- Fixes a bug with block sizes varying more than 64x.
- Improves the LFSR implementation.
- Fixes missing JSON bandwidth output.
- Various fixes for the Android platform.
- Uses ginstall on Solaris.
- Fixes man page installation.
- Other bugfixes and improvements
