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RDO installation : Huge resources consumption (RAM)

Hello everyone.

I want to ask about the huge resource consumption (especially RAM), I had installed for a lot of time RDO based OpenStack (Juno, Kilo on Fedora and now Liberty on CentOS 7) but before even starting instances I face the consumption of the totality of RAM.
Previous environment:
- RAM : 16 GB
- OS : Fedora 21
- RAM Usage : 10 GB
Current environment :
- RAM : 5 GB
- OS : CentOS 7
- RAM Usage : 4.85 GB + swaping.
I don't really know what is the problem. is it a configuration matter or thing like that ?
I need your help as i am doing an academic project using OpenStack.

Thank you .