fio

flexible I/O tester and benchmark

TLDR

Sequential read test

$ fio --name=test --rw=read --size=[1G]

Random write test

$ fio --name=test --rw=randwrite --size=[1G]

Run job file

$ fio [jobfile.fio]

Mixed read/write

$ fio --name=test --rw=randrw --rwmixread=[70] --size=[1G]

Measure latency

$ fio --name=test --rw=randread --size=[1G] --lat_percentiles=1

fio (Flexible I/O Tester) is a versatile I/O benchmark tool for testing storage performance. It simulates various workload patterns and measures throughput, IOPS, and latency.The tool supports numerous I/O engines including sync, libaio, io_uring, and network protocols. Job files define complex test scenarios with multiple workloads.fio is the standard tool for storage benchmarking, used for disk selection, filesystem tuning, and performance validation.

PARAMETERS

JOBFILES

Job definition files.

--name NAME

Job name.

--rw TYPE

I/O type: read, write, randread, randwrite, randrw.

--size SIZE

Total I/O size.

--bs SIZE

Block size.

--iodepth N

I/O queue depth.

--numjobs N

Number of parallel jobs.

--runtime SEC

Test duration.

--output FILE

Output file.

--help

Display help information.

INSTALL

sudo apt install fio

sudo dnf install fio

sudo pacman -S fio

sudo apk add fio

sudo zypper install fio

brew install fio

nix profile install nixpkgs#fio

CAVEATS

Results vary with test parameters. May fill disk with test files. Requires understanding of I/O patterns for meaningful results.

HISTORY

fio was created by Jens Axboe, the Linux block layer maintainer. It's the most comprehensive open source storage benchmark, supporting virtually every I/O pattern and storage backend.

RESOURCES

Source code · Documentation

fio