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In Linux, for a 8GB RAM server, when could we say virtual memory is actually used more? I.e., what is the number of page faults which says system is using more virtual memory?

  • Memory usage (excluding cache/buffers) will of course be exactly the same, as will virtual memory usage. Are you perhaps referring to swap? – Daniel B Dec 24 '16 at 22:50
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Of course yes, Virtual Memory (known as Swap in Linux) will be used less when there is enough memory.

There is a kernel parameter called swappiness that controls how much swap is likely to be used. Tune it to your needs. To see current value (all commands need root):

cat /proc/sys/vm/swappiness

and to set the value

sysctl vm.swappiness=10

and to persist it, open /etc/sysctl.conf and add (or change)

vm.swappiness=10

More information here.

Consider value as percent, and less value means using less swap.

On my laptop with 16GB RAM, using 10 I'm just fine.

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