[Seaside] Re: Seaside and Connection Reset by Peer problems

[Sven Van Caekenberghe]

David,

You are benchmarking 'session creation', not 'session using', think about it. Correctly benchmarking Seaside is very hard to do because it is state full by definition.

You need to increase #listenBacklogSize up from 32 if you want more concurrency.

Normal performance for 1 Seaside image is 50-100 full dynamic req/s

Performance for a pure Zinc HTTP server can be 10x as much, for example, serving a single byte reusing connections, but will drop when the work/size per request is increased.

Load balancing is the answer, as well as off loading static resource serving.

Sven

> On 17 Feb 2015, at 19:52, David Carlos Manuelda <stormbyte at gmail.com> wrote:
> 
> Sebastian Sastre wrote:
> 
>> To be safe, if you want to go beyond 10 or 15 concurrent connections you
>> put additional Pharo image workers so you scale your application
>> horizontally. It makes good use of CPU too.
>> 
>> There is a point in which all stacks have to do it, so yes, I think you
>> are testing the borders of one Pharo worker.
>> 
>> PS: when you use more than one, you have to design your app in a "more
>> stateless way" and use sticky sessions
>> 
> Thanks for your response.
> 
> Yes, in previous tests, I made an array with 8 pharo images with nginx as 
> load balancer with sticky sessions, and, of course it responded to ~1k 
> concurrent petitions without problems, but of course, it still failed beyond 
> some point, so that is why I decided to run tests on a single one.
> 
> Isn't there any way to change this behavior, for example by letting a higher 
> timeout or something else in order not to have those connections rejected so 
> soon? Because in my opinion, less than 300 petition per second on the same 
> image is not such a high load for it to be starting to drop connections.
> 
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