fio

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

fio is ranked #2 of 29 in disk benchmark software on Inferse. It runs on Linux, macOS, Windows. There is a free plan.

Compared on disk benchmark software

Free plan: Yesfio.readthedocs.io
Random I/O tests: Yesfio.readthedocs.io
Sequential tests: Yesfio.readthedocs.io
IOPS measurement: Yesfio.readthedocs.io
Latency measurement: Yesfio.readthedocs.io
Supported platforms: Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, DragonFlyfio.readthedocs.io
Command-line interface: Yesfio.readthedocs.io

Facts

Purpose: fio simulates user-defined I/O workloads for performance testing and reproducing bugs.fio.readthedocs.io · 29 Sept 2026
Workload setup: Users describe workloads in job files or provide parameters on the command line.fio.readthedocs.io · 29 Sept 2026
Workload controls: Workloads can configure I/O patterns, block size, I/O size, engines, queue depth, target files or devices, and threads or processes.fio.readthedocs.io · 29 Sept 2026
Reporting: Output can be reported in normal, terse, JSON, or JSON+ formats.fio.readthedocs.io · 29 Sept 2026
Remote operation: fio can run as a backend server and accept jobs from clients on other hosts.fio.readthedocs.io · 29 Sept 2026
Storage access: The documentation describes HTTP and S3 access through fio's HTTP engine.fio.readthedocs.io · 29 Sept 2026
Platforms: The documentation lists Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, and DragonFly as supported platforms, while noting that some features vary by platform.fio.readthedocs.io · 29 Sept 2026
Windows requirement: The minimum Windows versions for building or running fio are Windows 7 and Windows Server 2008 R2.fio.readthedocs.io · 29 Sept 2026
Download options: The documentation points to official release installers for Windows on GitHub and lists binary packages in several Linux distributions and other repositories.fio.readthedocs.io · 29 Sept 2026
Safety control: The --readonly option prevents writes and trims, and fio aborts destructive jobs on devices that appear mounted unless allow_mounted_write is set.fio.readthedocs.io · 29 Sept 2026
Permissions: fio does not need root unless the specified files or devices require it, though some options may also be restricted.fio.readthedocs.io · 29 Sept 2026
Support: The project mailing list is for discussion, bug reports, questions, and development; the documentation also directs bug reports to the mailing list or GitHub.fio.readthedocs.io · 29 Sept 2026
Author: The documentation names Jens Axboe as fio's author and says he wrote it to enable flexible testing of the Linux I/O subsystem and schedulers.fio.readthedocs.io · 29 Sept 2026
Maintainers: The documentation names Jens Axboe and Vincent Fu as maintainers.fio.readthedocs.io · 29 Sept 2026
Purpose: fio simulates user-defined I/O workloads to test performance or reproduce bugs.fio.readthedocs.io · 30 Sept 2026
Workload setup: Users describe workloads in job files or provide job parameters on the command line.fio.readthedocs.io · 30 Sept 2026
Workload controls: Job parameters include I/O pattern, block size, data size, I/O engine, queue depth, target files or devices, and thread or process count.fio.readthedocs.io · 30 Sept 2026
Reporting: fio can output normal, terse, JSON, and JSON+ reports.fio.readthedocs.io · 30 Sept 2026
Remote execution: fio supports a client/server mode that can send jobs to run on remote hosts.fio.readthedocs.io · 30 Sept 2026
Platforms: The documentation lists Linux, Solaris, AIX, HP-UX, OSX, NetBSD, OpenBSD, Windows, FreeBSD, and DragonFly as supported platforms, while noting that some features vary by platform.fio.readthedocs.io · 30 Sept 2026
Windows requirements: The documented minimum Windows versions are Windows 7 and Windows Server 2008 R2; Cygwin is required to build fio on Windows.fio.readthedocs.io · 30 Sept 2026
Distribution: The documentation says tagged-release Windows installers are available through GitHub Releases and mentions Linux distribution packages.fio.readthedocs.io · 30 Sept 2026
License: fio is free software published under version 2 of the GNU GPL.fio.readthedocs.io · 30 Sept 2026
Safety option: The --readonly option enables checks intended to prevent write and trim workloads.fio.readthedocs.io · 30 Sept 2026
Support: The project mailing list is intended for discussion, bug reports, questions, and development; the documentation also directs bug reports to the mailing list reflector or GitHub page.fio.readthedocs.io · 30 Sept 2026
Intended users: The author describes fio as a tool for simulating specific I/O workloads without repeatedly writing tailored test programs.fio.readthedocs.io · 30 Sept 2026