fio 介绍
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。
It can work on block devices as well as files. fio accepts job descriptions in
a simple-to-understand text format. Several example job files are included.
fio displays all sorts of I/O performance information. Fio is in wide use in
many places, for both benchmarking, QA, and verification purposes. It supports
Linux, FreeBSD, NetBSD, OS X, OpenSolaris, AIX, and Windows.
fio 官网
http://git.kernel.dk/?p=fio.git;a=summary
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