This was talked about here: 
https://groups.google.com/forum/#!searchin/clojure/user$3A$20g$20vim/clojure/XqPGnX5aSAI/PoLYaydgX3cJ

TLDR: The JVM carves out its own chunk of memory from the OS.  It then uses 
very advanced and finely tuned means to manage said memory.  So even though 
the app isn't doing anything the JVM is still using its memory.  Best to 
load up your app and profile it with VisualVM to see what is actually going 
on.

On Saturday, January 25, 2014 12:44:28 PM UTC-5, Anurag Ramdasan wrote:
>
> I've been playing around with clojure for a while now but never actually 
> made anything in it.
> Today I started looking around into pedestal and started following its 
> tutorials. Once I kept the 
> server running for a few hours I noticed that it took upto 500MB of my ram 
> even though it wasn't really 
> doing anything. Is pedestal usually this memory hungry? 
>
> I know that usually things running on JVM have some amount of memory 
> usage. Are all full-fledged apps 
> written in Clojure usually memory intensive? If not, does clojure have a 
> lightweight, less memory consuming 
> web framework?
>
> Thanks,
> Anurag Ramdasan.
>

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