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AWS - Linear Scale of Instance Capacity


Fabio Cardoso
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According to the "WebRTC Streaming Cost Calculator", an EC2 instance with 32 cores would support 2000 concurrent users.Is this scale linear (or at least close to linear?)

 

For example, a c5.9xlarge (36 ECU) instance would support something close to 2000 viewers.Could a c5.18xlarge (72 ECU) instance support 4000 viewers?

 

Would it be safe to say that a c5.24xlarge (96 ECU) instance, the largest available on AWS, would support 5000 users?

 

I understand that I can use Ant Media Server as a cluster. In fact, I have used ant clusters a lot. But it's easier and less costly to use only one instance for small streams.

 

I could also try to simulate a load with the tools that are available, but they are never representative of actual usage.

 

I want to know how far I can go.

 

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Hello,

Yes, it is very close to linear according to our tests, however, as you see in the Cost Calculator the maximum limit is 32 core instances. 
Up to 32, we know that it is at least close to linear. The tests for the instances with higher core counts are not extensively conducted. Here, we don't want to give false information about any issue. We can add this issue to our schedule and only after that I can say that you should be using a 72 ECU instance or a cluster setup.

Thank you for your understanding,
Cem

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