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Here, 8888 is the ID of the Java process.

Testing channel bandwidth using iperf

A stream published picture quality depends on channel bandwidth between publisher and server, the same for subscriber. Channel bandwidth can be checked using iperf utility. This program is implemented for all major OS: Windows, MacOS, Ubuntu/Debian, CentOS. iperf in server mode can be installed and running with WCS, that allows to check whole channel bandwith from publisher to viewer.

iperf can be installed on CentOS 7 as follows:

yum install iperf3

Run iperf in server mode

iperf3 -s -p 5201

where 5201 is iperf port for testing client connections

On client side iperf can be launched as follows:

1. To test upload channel bandwith (Windows example)

iperf3.exe -c test2.flashphoner.com -p 5201 -w 256K

Where

• test2.flashphoner.com - WCS server
• 5201 - iperf port to connect
• 256K - TCP buffer size 

The result of the command above should look like this:

Image Added

2. To test download channel bandwidth

iperf3.exe -c test2.flashphoner.com -p 5201 -w 256K -R

Where

• test2.flashphoner.com - WCS server
• 5201 - iperf port to connect
• 256K - TCP buffer size 

The result of the command above should look like this:

Image Added

By default, iperf tests the channel for 10 seconds. This interval should be increased, for example, to 120 second

iperf3.exe -c test2.flashphoner.com -p 5201 -w 256K -t 120

Note that iperf major versions on server and on testing client should be the same. Today version 3 is actual, but ther is also version 2 in repositories.