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Jitsi Videobridge Performance Evaluation

The page presents performance tests for Jitsi Videobridge on an unmodified Jitsi Meet installation running on a dedicated Xeon server. It measures conferences, endpoints, CPU usage, and network throughput, and says the system handled more than 1000 video streams at about 550 Mbps with low CPU use.

Reading notes
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  • The tests were run on a dedicated server with nginx, prosody, and Jitsi Videobridge, using a quad-core Intel Xeon E5-1620 v2 CPU.
  • The measured variables were conferences, endpoints, CPU usage, network in, and network out.
  • The extracted values included bitrate and streams.
  • The test used one Chrome instance as the conference focus, with camera and microphone muted.
  • The other endpoints used Jitsi Hammer and streamed pre-recorded audio and video at about 515 Kbps per endpoint.
  • The setup used a full-star topology so that incoming traffic from each endpoint was propagated to every other endpoint.
  • The page says this creates K*(K-1) streams leaving the videobridge.
  • Tests were run with K = 10, 15, 20, 25, 29, and 33.
  • The page says that in practice large conferences would use Last N mode so only the most recent speakers are distributed and shown.
  • In one run, 33 load generators caused Jitsi Videobridge to distribute 1056 streams and bandwidth use went above 550 Mbps.
  • The same run used about 20% CPU.
  • The page says CPU usage increases nearly linearly with total bitrate.
  • It compares 1056 video streams to 528 one-to-one conferences, 176 3-person conferences, or 53 conferences with 5 people.
  • The JVM was run with a 3 GB memory limit and did not exceed it.
  • The Jitsi Videobridge process RSS never exceeded 1500 MB.
  • A later run increased the stream count from 90 to 812 and then to 1056, with CPU usage staying stable in the intervals used for averaging.
  • The reported averages are 90 streams at 47.6 Mbps and 3.1% CPU, 380 streams at 199.4 Mbps and 8.0% CPU, 600 streams at 314.7 Mbps and 11.7% CPU, 812 streams at 425.5 Mbps and 15.7% CPU, and 1056 streams at 550.4 Mbps and 20.3% CPU.