Setup Memory in VPS :-

Setup Memory in VPS :-
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To make things a bit simpler, let's look at setting a VPS with a minimum of 256MB of RAM, and up to 1GB. To do that, set the vmguarpages (that's the memory that's guaranteed to the VPS) and privvmpages (that's the maximum amount of memory that will be granted) parameters:
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vzctl set vpsid --vmguarpages 65536 --save  --> 256 MB RAM
vzctl set vpsid --privvmpages 262144 --save --> 1GB burstable RAM
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384MB
vzctl set vpsid --vmguarpages $((384 * 256)) --save

2GB
vzctl set vpsid --privvmpages (262144 * 2) --save = vzctl set vpsid --privvmpages 524288 --save
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512MB
vzctl set vpsid --vmguarpages $((384 * 256)) --save

4GB
vzctl set vpsid --privvmpages (262144 * 4) --save = vzctl set vpsid --privvmpages 1048576 --save
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Total Memory usage :- 

# vzcalc -v vpsid