fio

Windows · Mac · Linux · Self-hosted

Freedom report

Three barsScore 6.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

fio is ranked #7 of 65 in PC benchmark software on Freedom251, made by fio. It runs on Linux, macOS, Self-hosted, Windows. There is a free plan.

fio plans and pricing

All plans

fio Free Open-source I/O tester · GPL-2.0 github.com · 4 Oct 2026

Compared on PC benchmark software

Free plan: Yes
Workload areas: sequential reads/writes; random reads/writes; mixed read/write; trim operations; bandwidth; IOPS; submission, completion, and total latency
Operating systems: Linux; Windows; macOS
Result export formats: normal text; CSV (terse); JSON; JSON+
Custom test profiles: Yes
CLI or automation: Yes

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The record

Comparison database: No
Purpose: fio simulates configurable I/O workloads for performance testing and reproducing bugs.
Workload setup: Workloads are defined in job files that can describe multiple threads, processes, and files.
I/O patterns: Jobs can perform sequential, random, or mixed reads and writes, using buffered, direct, or raw I/O.
Tuning: Workload parameters include block size, I/O size, I/O engine, queue depth, target files or devices, and job count.
I/O engines: Documented engines include Linux io_uring and libaio, POSIX asynchronous I/O, and synchronous read/write engines.
Storage integrations: The HTTP engine supports GET and PUT requests to WebDAV or S3 endpoints, and separate engines provide Ceph RADOS and RBD access.
Output: Results can be written in normal, terse, JSON, or JSON+ formats, with terse output intended for scripts, tables, or graphs.
Data verification: Verification options can check written data after a workload, including repeated burn-in tests.
Platforms: The project lists Windows installers for tagged releases and packages for Linux distributions, Solaris, and BSDs; its release notes also mention macOS.
Distribution: The repository identifies GPL-2.0 as the project license.
Support: The maintainers direct bug reports to the fio mailing list or GitHub rather than to them by direct email.
Notable limit: The documented HTTP engine supports direct I/O only at I/O depth 1, with scaling through multiple jobs.
Founded: 2006
Price from: Free

Where it ranks on Freedom251

Best PC Benchmark Software in 2026#7 of 65

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Sources

github.com/axboe/fio· checked 24 Sept 2026
github.com/axboe/fio/blob/master/HOWTO.rst· checked 4 Oct 2026