[Rails] optimize la value of pool in database.yml

Hi,

I would like to understand how to calculate optimal value for "pool" parameter in database.yml

I'm using rails 3, ruby 2, postgres, elasticsearch, unicorn, nginx

My server : 12 coeurs 24 threads ( I dont know if it is necessary for define pool value)

unicorn : worker_processes 24

I have around 1500 pages requested per minutes, and around 200ms per request

Is it also useful/necessary to use this ?

    allow_concurrency: true

thanks

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