uperf is a network performance tool that supports modelling and replay of various networking patterns. uperf was developed by the Performance Applications Engineering group at Sun Microsystems and is released under the GNU General Public License Version 3.

Latest News

The CVS version contains support for IPV6, fixes for SCTP and a few minor bug fixes. The SCTP fixes and IPV6 support were graciously contributed by Michael Tuexen.

Nov 13 2012 - Uperf 1.0.4 is now available

Uperf 1.0.4 is now available. It is known to work on Solaris, Linux, FreeBSD and MacOS. You can download the sources here

Jul 15 2009 - Uperf 1.0.3-beta is now available

The following bugs have been fixed since 1.0.2

You can download the binaries(Solaris, Linux and FreeBSD) or the source.

June 18 2009 - Follow uperf on twitter

June 24 2008 - uperf 1.0.2 is available!


uperf represents the next generation benchmarking tools (like filebench) where instead of running a fixed benchmark or workload, a description (or model) of the workload is provided and the tool generates the load according to the model. By distilling the benchmark or workload into a model, you can now do various things like change the scale of the workload, change different parameters, change protocols, etc and analyse the effect of these changes on your model. You can also study the effect of interleaving CPU activity, or think times or the use of SSL instead of TCP among many other things.

Some of the questions you could answer using uperf are

and much more!


More information regarding uperf can be found at the following blogs


uperf currently runs on Solaris (sparc and x64) and Linux. There is some work going on to make it work on windows. You can either


For comments and discussions, please join us at uperf-discuss@lists.sourceforge.net. If you find any bugs or have any requests, please check the bug/issue database before filing a new one.

Hosting provided by SourceForge.net Logo