How can I increase the number of concurrent subscribers?

[sangsoo]

Hello~
I have a question.
How can I increase the number of concurrent subscribers?

Attachment 1 (htop + c4.2xlarge.200.png) is htop screen during stress test using two c4.2xlarge units.
-Both server's java heap have xmx8g and xms8g set up,
-More than 4000 media freee ports. (media_port_to=39999)

1. Server A played 250 streams from Server B. (using console-stress play stream)
2. Played streams in A and B separately for server comparison.
3. Streaming 220 or so slows the B server. (timer)

Load Average, CPU Avg, and Memory don't look high on htop. Why does streaming delay occur? Attachment 2 (play + c4.2xlarge.200.png)
What specifications do you need to increase to play more (300+) servers?
ex) AWS EC2 m2 / m4 instances are more appropriate.

Can I get performance data by server HW (including EC2) specifications?
I want to estimate the number of publishers & subscribers on the server.
please answer me.

Best Regards.

 

[Max]

Good day.

1. Server A played 250 streams from Server B. (using console-stress play stream)
2. Played streams in A and B separately for server comparison.
3. Streaming 220 or so slows the B server. (timer)

In this configuration (server A and server B) you cannot test more subscribers. On server В you hit size of the Java Heap (we see in attach, 7010Mb)
Try server A (c4.4xlarge) with large memory size and specify heap size in wcs-core.properties file. For example 16 Gb where physical RAM is 32 Gb:

-Xmx16g -Xms16g

Can I get performance data by server HW (including EC2) specifications?
I want to estimate the number of publishers & subscribers on the server.

Performance depends on many factors (bitrate, transcoding, network load, e.g.). For additional help, please run test with another server A and attach output:

http://<server A>:8081/?action=stat
http://<server B>:8081/?action=stat

 

[sangsoo]

Thank you for reply.
We will test after upgrading the A server specification.

I would like to ask more about this symptom.
In order to compare the status of the two servers, the video from A (for Subscriber) and B (for Publisher) was played in advance before the stress test. I assumed the server was stable if it streamed seamlessly. (Timer also matches almost.)

When A server Java Heap reached the limit of 7010, I could expect A server to slow down.
But rather, B server streaming was delayed. What is the reason? (see play + c4.2xlarge.200.png)
At this point, I think server B is stable (htop + c4.2xlarge.200.png, 8:36:29.11, 2 seconds slower than server A). Often slower than 10 seconds.
If the degrade streams field is looked up in the REST API "http://~?action=stat", Is this the maximum performance of the server?
I'm curious about this symptom.

Best Regards.

 

[Max]

Good day.

When A server Java Heap reached the limit of 7010, I could expect A server to slow down.
But rather, B server streaming was delayed. What is the reason? (see play + c4.2xlarge.200.png)

When server A ran out of heap, it could not subscribe for new stream. For more investigations we need logs from server B (directory /usr/local/FlashphonerWebCallServer/logs/*)

If the degrade streams field is looked up in the REST API "http://~?action=stat", Is this the maximum performance of the server?

We will check and let you know.

 

[sangsoo]

Thank you for reply.
All logs are deleted now (daily delete).
I'll try some more tests.
If you have any questions, I will attach the log.
Best Regards.

 

[Max]

Good day.
Performance tips in your case:
1. Select more performance Amazon instance (with large RAM and possibly multiple CPUs).
2. Configure the Z Garbage Collector (Java 12 required) according to the recommendations.
3. You have enough media ports (media_port_from, media_port_to). But by default, no more than 1000 streams are pulled in WCS load server. To expand this limit (wcs_agent_port_from, wcs_agent_port_to) see these documentations.