fio, the Flexible I/O Tester, is a highly configurable workload generator for testing storage devices and I/O subsystems.
Rather than imposing a fixed benchmark, fio lets you describe the workload you want to reproduce. Jobs can vary access patterns, block sizes, queue depths, numbers of workers, read/write ratios and many other parameters.
It is equally useful for measuring straightforward SSD performance and for recreating complex workloads when investigating latency, throughput or storage-related problems.
This is free and open source software.
Key Features
- Defines workloads using reusable job files or command-line options.
- Runs multiple threads or processes with independently configurable I/O workloads.
- Supports sequential, random and mixed read/write workloads.
- Works with synchronous and asynchronous I/O interfaces including modern Linux I/O engines.
- Measures bandwidth, IOPS and detailed latency statistics.
- Supports configurable block sizes, queue depths and numbers of jobs.
- Can test buffered and direct I/O.
- Provides data verification facilities for checking I/O correctness.
- Supports rate limiting and controlled workload generation.
- Can exercise files, block devices and other supported I/O targets.
- Produces machine-readable output suitable for automated analysis.
- Runs on Linux and a range of other operating systems.
Website: github.com/axboe/fio
Support:
Developer: Jens Axboe and contributors
License: GNU General Public License v2.0
fio is written in C. Learn C with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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