Jul 20, 2023

Performance Test of Sequential File I/O

Iozone ‘IO Zone’ Benchmark Program

Iozone tests the speed of sequential I/O to actual files. Therefore, this measurement factors in the efficiency of your machine’s file system, operating system, C compiler, and C runtime library. It produces a measurement which is the number of bytes per second that your system can read or write to a file.

FreeBSD, the open-source operating system, derives its roots from the Berkeley Software Distribution and is built upon the robust Unix architecture. It is well-appreciated for its stability, performance, and sophisticated networking capabilities among system administrators, web developers, and power users.

Central to FreeBSD’s strength is its extensive collection of precompiled binary packages, known as ports. In the world of FreeBSD, ‘port’ refers to a repository of metadata about a third-party application or software.

One such port that stands out in the category of benchmarks is iozone.

Understanding iozone

iozone is a filesystem benchmarking tool. It is designed to facilitate the performance of a large variety of local and remote filesystem operations. It is highly flexible, enabling users to tweak several parameters to simulate different loads or types of operations. iozone can test NFS, do timings of simple read, write, re-read, re-write operations, check cache effects, and more. You can download it from [here]https//

The fundamental role of iozone is to measure the performance of I/O input/output operations of various filesystems. It is instrumental in determining how well your filesystem performs when dealing with large files, small files, or a mix of both - information can be critical when you’re planning your storage infrastructure or optimizing your application performance.

Installing iozone

Installing iozone in FreeBSD is quite straightforward. You can install it via the FreeBSD Ports collection. Open your terminal and type in the following commands

cd /usr/ports/benchmarks/iozone && make install clean

Alternatively, you also have the option to install it as a binary package via pkg

pkg install iozone

Using iozone

iozone has a multitude of command-line options that you can use to fine-tune your filesystem’s benchmarking. To view all the available options, you can type iozone -h in your terminal.

You can run iozone with default settings, which will test a variety of read and write operations for file sizes between 64KB and 512MB, with record lengths between 4KB and 16MB. To do this, open your terminal and type


To specify file sizes and record lengths, you can use the -s and -r options. For instance, to test a file size of 1GB and a record length of 128KB, you would use the following command

iozone -s 1G -r 128k

iozone automatically creates a report upon completion of the benchmark in a comprehensive and intuitive format.

Throughout its performance testing process, iozone produces comprehensive data that you can use to analyze your file system’s operation speeds across a range of different file sizes. This data can provide valuable insights into where potential bottlenecks may lie within your system.

Benefits of iozone

iozone is portable and easy to use, making it a go-to choice for system administrators and developers looking to measure and analyze their filesystem performance. The benchmarking data produced by iozone can help identify areas of potential improvement within your filesystem, thereby allowing you to optimize it for your specific use-case.

Moreover, the fact that iozone is a part of FreeBSD’s comprehensive ports collection further simplifies the process of installing and maintaining the tool on your FreeBSD system.

Other Ports to Consider

While iozone is a powerful tool for benchmarking filesystem performance, FreeBSD’s ports collection includes a plethora of other utilities you may find useful. If you’re interested in IT security, you might want to consider [nmap]https//, a powerful network scanner that can find hosts and services on a computer network, thus creating a network “map”.

In conclusion, iozone is a highly flexible and comprehensive filesystem benchmarking tool that can yield important insights into your filesystem’s performance. Whether you’re an administrator looking to fine-tune your server’s performance or a developer seeking to optimize your application’s read/write operations, iozone should definitely be in your toolbox.

Checkout these related ports:
  • Wrk - Modern HTTP benchmarking tool
  • Webbench - Simple forking web benchmark
  • Vkpeak - Profile Vulkan devices to find their peak capacities
  • Vkoverhead - Evaluate CPU overhead of Vulkan drivers
  • Vkmark - Vulkan benchmark
  • Vegeta - HTTP load testing tool and library
  • Uperf - Network performance tool to model and replay of networking patterns
  • Unixbench - BYTE magazine's Public Domain benchmark for UNIX
  • Uica - Code Analyzer from the project
  • Ubench - Unix Benchmark Utility for CPU(s) and memory
  • Typometer - Text/code editor typing latency analyzer
  • Ttcp - Benchmarking tool for analysing TCP and UDP performance
  • Tsung - Multi-protocol distributed load testing tool
  • Thrulay - Network capacity tester
  • Tcpblast - Measures the throughput of a TCP connection