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IOzone Filesystem Benchmark

IOzone Filesystem Benchmark 3.487

IOzone is a filesystem benchmark tool which measures various operations like read, write, re-read, re-write, among many others. Learn what's new on this latest version. Click here if the download does not begin automatically.

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More about IOzone Filesystem Benchmark

The benchmark generates and measures a variety of file operations. Iozone has been ported to many machines and runs under many operating systems.

Iozone is useful for performing a broad filesystem analysis of a vendor’s computer platform. The benchmark tests file I/O performance for the following operations:
  • Read
  • Write
  • Re-read
  • Re-write
  • Read backwards
  • Read strided
  • Fread
  • Fwrite
  • Random read
  • Pread
  • Mmap
  • Aio_read
  • Aio_write


While computers are typically purchased with an application in mind it is also likely that over time the application mix will change. Many vendors have enhanced their operating systems to perform well for some frequently used applications. Although this accelerates the I/O for those few applications it is also likely that the system may not perform well for other applications that were not targeted by the operating system. An example of this type of enhancement is: Database. Many operating systems vendors have tested and tuned the filesystem so it works well with databases. While the database users are happy, the other users may not be so happy as the entire system may be giving all of the system resources to the database users at the expense of all other users. Read more.

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