Skip to main content
J
JeffPei
Participant
July 22, 2011
Question

Reduce CPU usage with RTMFT video chatting

  • July 22, 2011
  • 2 replies
  • 1065 views

Hi,

We are using the FMS4 for 1-1 real time video chatting. it is fine but the CPU usage are very high.

  "

(not P2P but use UDP based RTMFP) currently connection to server as " rtmfp://1.2.3.4:80/live"

we use the :80 I guess it helps to deal with the firewall with HTTP tunneling? (seems if it is true, it will this degrade performance?)

with 320*240; it is using 30~50 % CPU;  with 480*360: 40-60% CPU at the clients.  so high... decent client machine: Intel i5 650. Quad 3.3Ghz  8G RAM. win7 64

Any idea on reducing cpu usage?

    This topic has been closed for replies.

    2 replies

    M
    Adobe Employee
    Michael Thornburgh
    Adobe Employee
    July 26, 2011

    RTMFP is a UDP-based protocol and does not currently tunnel over HTTP.  when you specify port 80 with RTMFP, you're using UDP port 80, not TCP port 80.  also, that port 80 is the fmsedge port; you will be redirected to a different port (19350+ by default) for the true client-server connection.

    RTMFP has significantly higher overhead than RTMP for two main reasons: 1) RTMFP is a complete network transport protocol of similar complexity to TCP, but implemented entirely in user space instead of in the operating system kernel, so every packet sent on the network requires special processing and at least one context switch to kernel mode for transmission or reception; 2) every byte of every packet in RTMFP is encrypted with AES-128-CBC, a non-trivial cipher requiring a not-insubstantial amount of CPU.  there is no unencrypted form of RTMFP.

    Nikhil_Kalyan
    Nikhil_Kalyan
    Participating Frequently
    July 22, 2011

    Hi,

    Thanks for using RTMFP.

    Changing the port to 80 will not effect the CPU usage. So that wont bother us.

    By default, on FMS, aggregate messages are turned on, which uses more CPU than when it is disabled. Depending on your workflow, if disabling the agg messages is acceptable, it might help in reducing the CPU usage. Agg message can be turned off either in server.xml or the application.xml under the conf directory below the fms installation directory

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices