Last Updated on September 11, 2023
fio was created to allow benchmarking specific disk IO workloads. It can issue its IO requests using one of many synchronous and asynchronous IO APIs, and can also use various APIs which allow many IO requests to be issued with a single API call.
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, including complete IO latencies and percentiles.
fio is a tool that will spawn a number of threads or processes doing a particular type of I/O action as specified by the user.
The typical use of fio is to write a job file matching the I/O load one wants to simulate.
fio spawns a number of threads or processes doing a particular type of I/O action as specified by the user. fio takes a number of global parameters, each inherited by the thread unless otherwise parameters given to them overriding that setting is given. The typical use of fio is to write a job file matching the I/O load one wants to simulate.
- Uses pthread mutexes for signalling and locking.
- Various global options through which different type of workloads can be generated.
- Wide range of I/O engines (sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio, and more).
- Batch mode.
- Very extensive set of parameters.
- Cross-platform support – works on (at least) Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, and DragonFly. Some features and/or options may only be available on some of the platforms.
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