theoretically a db = DAL(...., pool_size=5) will create AT MOST 5 connections to that db. you have 20, so any app's instance will create AT MOST 20 connections to the db. if you postgres accepts AT MOST 50 connections, you'll reach the top at 2 apps and a half. As for the ram consumed by postgres, it's a setting too. Of course if you have 4 gb of ram, 1.5 assigned to postgres seems normal (if not too conservative). Most db engines (postgresql included) benefit in any operation if more ram is available.
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