How exactly virtual machine divides Ram?

EralpS

Bit poster
Hello,
I am, actually I will be in two days, quite new to mac and parallels, I was using windows before, and I was happily dual booting ubuntu easily. I have a little acknowledge about virtual machines. I will get macbook pro 13" retina 2015 and I want to use windows, os x and some linux distribution preferably ubuntu, I learnt that I can dual boot windows 8 and above easily thanks to bootcamp. So I probably use parallels mostly for using ubuntu on mac.

Here comes my question, for example if I want to use parallels on os x, and my ram is 8 gb, and I give 4gigs to ubuntu while configuring the os with parallels, I am not talking about storage, only ram, does os x uses only the remaining 4 gigs while ubuntu is open? And what about I shut down the virtual machine,then can os X use 8gigs?

Another question is this, if I format all the ssd, can I remove the os X too? Or is there some kind of Mac sealing which prevents deleting the os X? If I can remove the os X how can I reinstall? Can I download os X as iso like windows and ubuntu? Even if I did, is there some kind of key like windows' and how can I restore if so?

Thanks in advance guys,
 
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