uperf is a network performance tool that supports modelling and replay of various networking patterns. uperf was initially developed by the Performance Applications Engineering group at Sun Microsystems. Since 2008, it is being developed by the community. uperf is released under the GNU General Public License Version 3.

The latest version of uperf is 1.0.8 (March 2023)


Uperf is known to work on Linux, Android, Solaris, FreeBSD and MacOS. You can download uperf sources from https://github.com/uperf/uperf

You can download Ubuntu binaries from Volodymyr Kononenko's PPA at https://launchpad.net/~vmkononenko/+archive/ubuntu/uperf

On FreeBSD, Uperf is available as a binary package (pkg install uperf) and a port (cd /usr/ports/benchmarks/uperf && make install clean). Details

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uperf represents a new kind of benchmarking tool (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


For comments and discussions, please open a GitHub Issue