Fri Jul 27 11:50:23 [clientcursormon] mem (MB) res:3 virt:76 mapped:0

Question

what is the meaning of this mongodb log ::

Fri Jul 27 11:50:23 [clientcursormon] mem (MB) res:3 virt:76 mapped:0

1. what is res ?.
2. what is virt ?.
3. what is mapped ?.

Answer 1

It tells you how much memory is currently in use :-

Res = Resident Memory Used (Physical Ram)
Vir = Virtual Memory Used
Mapped = Mapped memory used

Checking Server Memory Usage - MongoDB may help to explain further.