Resident set not decreasing after load decreased

[Dilshan Sandhu]

Hi,
I am working on a chat application build with golang. I am using open-source server tinode (https://github.com/tinode/chat) as base for my chat application. Issue is I am facing is the Resident set (as shown by top) shows very high memory usage after a load test ends. Also increasing channel capacity is resulting in higher end res value.
Some terminology about server. 
Topic:- Group is a topic, If i am coming online a topic is created, when two users chat, topic is created. 

I did some tests with different topic queue limits (hub.go:run():case join). Check scenario 1(og) and scenario2(modified). A gatling test was ran against both these conditions(and everything else same). At the start and end of each test(all ws closed), we noted the Resident Set (as given by htop)(these values remained stable after 5min also).
     Before    After

A  417M      1.71G
B  419M      2.09G

This indicates that the channels are not being cleaned for a topic which is not active. Any inputs would be helpful. 

Scenario1(A)

clientMsg: make(chan *ClientComMessage, 192),

serverMsg: make(chan *ServerComMessage, 64),

reg: make(chan *ClientComMessage, 256),

unreg: make(chan *ClientComMessage, 256),

meta: make(chan *ClientComMessage, 64),

Scenario2(B)

clientMsg: make(chan *ClientComMessage, 4096),

serverMsg: make(chan *ServerComMessage, 4096),

reg: make(chan *ClientComMessage, 4096),

unreg: make(chan *ClientComMessage, 4096),

meta: make(chan *ClientComMessage, 128),

At the start df

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