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Bonnie++

Free Software File System Benchmarking Tool

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Source updated August 9, 2025

Bonnie++ is a free software file system benchmarking tool for Unix-like operating systems, developed by Russell Coker. Bonnie++ is a benchmark suite that is aimed at performing a number of simple tests of hard drive and file system performance.

01Features

Bonnie++ allows you to benchmark how your file systems perform with respect to data read and write speed, the number of seeks that can be performed per second, and the number of file metadata operations that can be performed per second.

02Sample output

# ./bonnie++ -u root Using uid:0, gid:0. Writing with putc()...done Writing intelligently...done Rewriting...done Reading with getc()...done Reading intelligently...done start 'em...done...done...done... Create files in sequential order...done. Stat files in sequential order...done. Delete files in sequential order...done. Create files in random order...done. Stat files in random order...done. Delete files in random order...done. Version 1.03d ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks, Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP localhost 300M 6000 40 5913 9 4213 10 10407 86 20664 20 1078 13 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete, files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 10 93 +++++ +++ 74 63 17 90 +++++ +++ 27 58 localhost,300M,6000,40,5913,9,4213,10,10407,86,20664,20,1078.1,13,16,10,93,+++++,+++,74,63,17,90,+++++,+++,27,58

The final CSV output includes the information related to data read and write speed, number of seeks that can be performed per second, and number of file metadata operations that can be performed per second and the CPU usage statistics for the below given tests:

Create files in sequential order
Stat files in sequential order
Delete files in sequential order
Create files in random order
Stat files in random order
Delete files in random order

03History

This benchmark is named Bonnie++ because it is based on the Bonnie benchmark written by Tim Bray.

Watch videos about Bonnie++Explainers and documentaries on YouTube (opens in a new tab)

Sources and credits

This article is adapted from the Wikipedia article “Bonnie++”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.

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