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Add document about memory consumption

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Pavel Odintsov 2016-08-18 00:04:08 +03:00 committed by GitHub
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### Memory consumption
Required amount of memory is depends on total number of monitored hosts.
You could use this formula for calculations:
```bash
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 countring 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.