Petar Djurkovic <petar(dot)djurkovic(at)cbs(dot)co(dot)rs> writes:
> When I stop postgresql instance ram mem which postgres used stay
> uncleared and I must restart host machine, why is that happen and how
> can I solve this problem?
It's unlikely that this is a bug, but: how are you stopping Postgres
exactly? What observation convinces you that memory is not being
reclaimed? What's the operating system?
> Version of my Postgresql is 9.4.
9.4.which exactly?
regards, tom lane