First you need to install Iperf on all the machines that you wish to test throughput.
sudo apt-get install iperf
Once you have it installed, select a machine to be the server and run the following command
iperf -s or iperf --server
From the other computers run:
iperf -c 192.168.50.15 -f M
More info https://iperf.fr/
Tags: bandwith, iperf, network speed, throughput, wifi, wireless