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fio

Fio (Flexible I/O Tester) is a command line tool used for benchmarking and stress testing storage systems. It is designed to provide a comprehensive set of options to simulate various types of workloads and measure the performance of both local and remote storage devices.

Some key features of fio include:

  1. Flexibility: Fio allows users to customize and control the I/O workload by specifying parameters such as block size, I/O pattern, and queue depth. This flexibility enables the creation of realistic workload scenarios and the ability to test specific I/O patterns.

  2. Wide range of I/O engines: Fio supports various I/O engines like synchronous, asynchronous, memory-mapped, and I/O polling. This allows for testing different types of I/O operations and evaluating the performance of storage systems under different conditions.

  3. Multiple workloads: It supports a variety of workload profiles like sequential, random, read, write, and mixed workloads. These profiles can be combined and adjusted to simulate different real-world scenarios and evaluate how storage systems respond to various workloads.

  4. Output and analysis: Fio provides detailed output in various formats, including CSV and JSON, which can be used for further analysis and comparison of results. It captures statistics such as latency, bandwidth, IOPS (input/output operations per second), and I/O completion time, giving insights into performance characteristics.

  5. Multi-threading support: Fio supports multi-threading, allowing users to specify the number of threads or processes to run concurrently. This helps in simulating multi-threaded applications and measuring the impact on storage performance.

  6. Extensibility: Fio is an open-source tool with an active community, which means it can be extended and customized to fit specific testing requirements. Users can develop plugins, add new I/O engines, or contribute to the tool's development.

Overall, fio is a powerful and versatile command line tool that helps in evaluating the performance, scalability, and reliability of storage systems, making it a valuable tool for system administrators, developers, and storage engineers.

List of commands for fio:

  • fio:tldr:03108 fio: Test random read/write.
    $ sudo fio --filename=${filename} --size=500GB --direct=1 --rw=randrw --bs=4k --ioengine=libaio --iodepth=256 --runtime=120 --numjobs=4 --time_based --group_reporting --name=${job_name} --eta-newline=1
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  • fio:tldr:3173d fio: Test sequential reads.
    $ sudo fio --filename=${filename} --direct=1 --rw=read --bs=4k --ioengine=libaio --iodepth=256 --runtime=120 --numjobs=4 --time_based --group_reporting --name=${job_name} --eta-newline=1 --readonly
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  • fio:tldr:93a6c fio: Test with parameters from a job file.
    $ sudo fio ${path-to-job_file}
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  • fio:tldr:99978 fio: Convert a specific job file to command-line options.
    $ fio --showcmd ${path-to-job_file}
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  • fio:tldr:ff313 fio: Test random reads.
    $ sudo fio --filename=${filename} --direct=1 --rw=randread --bs=4k --ioengine=libaio --iodepth=256 --runtime=120 --numjobs=4 --time_based --group_reporting --name=${job_name} --eta-newline=1 --readonly
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tool overview