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Original author(s) William Norcott
Stable release 3.408 / May 10, 2012; 2 years ago (2012-05-10)
Written in C
Operating system Cross-platform
Available in English
Type Benchmark

IOzone is a file system benchmark utility.[1][2] Originally made by William Norcott, further enhanced by Don Capps and others, including Isom Crawford, Kirby Collins, Al Slater, Scott Rhine, Mike Wisner, Ken Goss, Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa.

Source code is available from It does mmap() file I/O and uses POSIX Threads.

It won the 2007 Infoworld Bossie Awards for Best file I/O tool.[3][4]

The Windows version of IOzone uses Cygwin. Builds are available for AIX, BSDI, HP-UX, IRIX, FreeBSD, Linux, OpenBSD, NetBSD, OSFV3, OSFV4, OSFV5, SCO OpenServer, Solaris, Mac OS X, Windows (95/98/Me/NT/2K/XP).

It is available as a test profile in the Phoronix Test Suite.[5]


  1. ^ Olker, Dave (2002-09-13). "Local Filesystem Considerations: iozone". Optimizing NFS Performance: Tuning and Troubleshooting NFS on HP-UX Systems (1st ed.). Upper Saddle River, New Jersey: Prentice Hall. pp. 24 – 26. ISBN 0-13-042816-7. iozone is one of the more sophisticated filesystem performance benchmark utilities available. 
  2. ^ Martin, Ben (2008-07-03). "IOzone for filesystem performance benchmarking". Retrieved 2009-10-15. 
  3. ^ Venezia, Paul (2007-09-10). "Best of open source in storage". 2007 InfoWorld Bossie Awards. InfoWorld. Retrieved 2009-10-15. 
  4. ^ "Best of open source in storage: slide 6 of 7". 2007 InfoWorld Bossie Awards. InfoWorld. 2007-09-10. Retrieved 2009-10-15. 
  5. ^

External links[edit]