thrulay, network capacity tester

The program thrulay is used to measure the capacity of a network by sending a bulk TCP stream over it.

Like other tools (such as iperf, netperf, nettest, nuttcp, ttcp, etc.), thrulay can report TCP throughput periodically so that TCP performance plots can be produced. Unlike other tools, thrulay not only reports goodput, but round-trip delay time as well. The output of thrulay is easy to parse by machine (in fact, it's ready to be used as a data file for gnuplot).

Starting from version 0.5, thrulay supports UDP tests. Unique feature of thrulay is that it can send a Poisson stream of very precisely positioned packets; the TSC register is used for timing rather than very coarse (20ms on most systems) system sleep functionality.

Mnemonic: THRUput and deLAY.

Download:
Source code (tar xzf FILE; cd DIR; ./configure; make install): thrulay-0.8.tar.gz
FreeBSD package (to be fed to pkg_add): thrulay-0.8.tbz

Mailing lists:

thrulay-announce

Announcements related to new releases, security, etc. Anyone downloading thrulay or interested in it is encouraged to subscribe.

thrulay-users

User discussion and questions.

Note: thrulay was formerly known as i2perf and was renamed to avoid any possible confusion with iperf.