[OpenSIPS-Users] Autoscaling

[Bogdan-Andrei Iancu]

Hi Dan,

The load is considered as the time a processes is busy in doing 
something (instead of waiting for a new task to handle). It is 
completely unrelated to the CPU load. Also the load will count any busy 
waiting or I/O waiting done by the process.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Summit 2019
   https://www.opensips.org/events/Summit-2019Amsterdam/

On 04/25/2019 04:47 PM, Dan Pascu wrote:
> I'm trying to understand how autoscaling works and I'd like some clarifications.
>
> When a process group load is calculated is that based on actual CPU load, or is it just computed as busy_processes/total_processes in that group?
>
> What I'm trying to figure out is the behavior in the case of the TCP process group, which is let's say configured to spawn a new worker when it reaches 70% load for the TCP worker group. Now consider that this group starts with 5 workers and at some point in time, all 5 workers are busy processing a message. In addition let's consider that the DNS lookup is misconfigured and it takes 3 seconds to get an answer. This means that if the proxy receives 5 messages at a time, all 5 workers will be blocked in a synchronous DNS lookup for 3 seconds, but each using 0% CPU.
>
> My question is, in this 3 second time window (when all 5 workers are blocked in waiting for the DNS lookup), if a new request arrives over TCP, will opensips spawn a new TCP worker because all 5 workers are busy and it considers the load to be 100%, or it will do nothing because it uses CPU load which is 0% since all 5 processes are sleeping waiting for the DNS answer?
>
> --
> Dan
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