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, forked or threaded jobs 等等。
fio 2.0.14 改进记录：
- Autodetect features with a new configure script when building.
- Improve ETA for some workloads.
- Support for verify mode that requires no metadata, greatly reducing memory requirements for big device verify workloads.
- Ensures fsync is always done, even for direct/raw I/O (if asked to).
- Support for unified read/write/trim reporting.
- A few axmap and cpuclock bugfixes.
- Fixes zones and numjobs used together.
- Adds support for idle profiling, showing idle system CPU when running a workload.
- Various Windows fixes.
- FreeBSD now supports CPU affinities.
- Many other fixes; all users should upgrade
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