CPU utilization by webrtcbin plugin

[Pradeep Acharya]

Hi ,
Any suggestions on reducing CPU utilization would be helpful.
Regards
Pradeep

On Thu, Aug 4, 2022 at 7:06 PM Pradeep Acharya <
pradeep.acharya1008 at gmail.com> wrote:

> Hi,
> This is a query related to CPU utilization and any optimization can be
> done to reduce the CPU utilization.i've a media server that connects to web
> app applications running in the browser  . The media server uses webrtc bin
> plugin .
> I use a single socket to transmit and receive audio/video .  I've attached
> the png files extracted from the Dot file. Below is configuration details
> of the server used
>
> Num of CPU cores: 8
> Model: Intel(R) Xeon(R) CPU  X5650  @ 2.67GHz
> Audio codec: opus
> video codec : VP8
> video encoding by clients: 640 x480 @ ~ 500 kbps
>
> The server does not decode or encode the RTP but just forward from one
> client to another. When I execute the top command, I find that the cpu % is
> around 14 to 16 % just for 2 clients . The cpu utilization goes up higher
> and higher as the number of clients connected to the server increases. For
> 8 participants it goes beyond 400% , distributed among the cores. output of
> the top command
>
> 2329570 root     -11   0 4074924  73708  18920 S   2.0   1.3   0:01.80
> queue1:src
> 2331060 root     -11   0 4074924  73708  18920 S   1.7   1.3   0:01.45
> nicesrc1:src
> 2329568 root     -11   0 4074924  73708  18920 S   1.3   1.3   0:05.39
> nicesrc0:src
> 2329569 root     -11   0 4074924  73708  18920 S   1.3   1.3   0:04.39
> queue0:src
> 2331061 root     -11   0 4074924  73708  18920 S   1.3   1.3   0:01.38
> queue2:src
> 2331062 root     -11   0 4074924  73708  18920 S   1.0   1.3   0:01.41
> queue3:src
> 2329567 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:01.64
> rtpsession-rtcp
> 2329583 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:00.94
> rtpjitterbuffer
> 2331058 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:00.39
> appsrc_Audio_36
> 2331059 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:00.64
> rtpsession-rtcp
> 2331079 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:00.42
> rtpjitterbuffer
> 2331080 root     -11   0 4074924  73708  18920 S   0.7   1.3   0:00.38
> rtpjitterbuffer
> 2329580 root     -11   0 4074924  73708  18920 S   0.3   1.3   0:00.08
> timer
> 2329582 root     -11   0 4074924  73708  18920 S   0.3   1.3   0:01.42
> rtpjitterbuffer
> 2329584 root     -11   0 4074924  73708  18920 S   0.3   1.3   0:00.51
> rtpjitterbuffer
> 2331070 root     -11   0 4074924  73708  18920 S   0.3   1.3   0:00.40
> appsrc_Audio_13
> 2331084 root     -11   0 4074924  73708  18920 S   0.3   1.3   0:00.20
> rtpjitterbuffer
>
> From the above, I see that nicesrc plugin takes around 2 % of cpu of one
> client  I think this plugin receives packets and puts them to queue. Should
> this thread take 2 % cpu to receive RTP packets from socket and put them to
> queue ?
> other elements like nicesink, rtpjitterbuffer ,appsrc thread consume CPU.
> Features like do-nack and TWCC are enabled for video
>
> 1. Is there any benchmark of CPU utilization that the webrtcbin plugin
> should take for a 2 way TX and RX of audio,video RTP packets @ 500 kbps ?
> 2. ARe there any element property config changes that need to be done to
> reduce CPU utilization ?
> 3. How to proceed to reduce cpu utilization ? Any suggestions that help
> me  in figuring out are welcome
>
>
> Thanks
> Pradeep
>
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