Memory occupied by LNMP Environment

LNMP, memory 512 MB. {Code...} is it necessary to add memory LNMP, memory 512 MB.

Physical memory: 489.27 MB in total, 459.78 MB in use, 29.49 MB in idle space, 93.97% of Cache Usage, 228.51 MB in memory, 46.7% of usage | Buffers buffer is 0 MB in real memory, 231.27 MB in use, real memory idle 258 M, usage 47.27% SWAP zone: 478.99 M in total, 75.49 M used, 403.5 M idle, usage 15.76%

Is it necessary to add memory?

Reply content:

LNMP, memory 512 MB.

Physical memory: 489.27 MB in total, 459.78 MB in use, 29.49 MB in idle space, 93.97% of Cache Usage, 228.51 MB in memory, 46.7% of usage | Buffers buffer is 0 MB in real memory, 231.27 MB in use, real memory idle 258 M, usage 47.27% SWAP zone: 478.99 M in total, 75.49 M used, 403.5 M idle, usage 15.76%

Is it necessary to add memory?

The actual memory usage is 231.27 M, the actual memory is idle 258 M, and the usage is 47.27%

Clearly written, not necessary for the moment

AuthenticUsed = total-free-buffer-cache