This guide applies to FastNetMon Community only. FastNetMon Advanced uses flexible counters which are way faster and can scale to extremely large networks.
Required amount of memory is depends on total number of monitored hosts.
You could use this formula for calculations:
total_number_of_hosts * 208 * 3
- 3 is a number of counters (data counter, current speed counter, smoothed speed counter).
- 208 is a total size of traffic counting structure for 1.1.3 version.
Example computations:
- /16, 65535 hosts – 40 mb of RAM
- /8, 16 millions of hosts – 10GB ram
But please keep in mind! We need to iterate across all counters with single CPU core in ~1 second. Then, for big number of hosts you need to have fast CPU core.
Memory requirements can be reduced using flexible counters