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The Flexible I/O Tester (FIO) is an I/O performance benchmarking utility for Linux, other UNIX-like systems and Windows. Jens Axboe is the author of FIO and the maintainer of the Linux kernel's block layer.[1]

Version Information

FIO has become directly available in several Linux distribution files.

Linux Distribution FIO Version
Debian Squeeze (Debian 6.0) 1.38
Ubuntu 10.04 LTS Lucid Lynx 1.33.1
Ubuntu 12.04 Precise Pengolin 1.59

The most recent version can always be download from FIO Git Repository (see also Compiling FIO) and compiled. Pre-built executables can also be found at

The following sources will help with the application and proper use of FIO.


  1. Cp. the /usr/src/linux/MAINTAINERS list for the current Linux kernel, such as

Additional Information

Related articles

Collect and report Linux System Activity Information with sar
I/O Performance of Hard Disks with SSDs and Fusion-io ioDrive