[Ntop-dev] Ntop Limits

[Burton Strauss]

If there are limits (and I guess C's pointer type would be), they're in
places that no one has ever been able to test - i.e. you run out of
addressable RAM long before you run out of possible pointer values.

The key structure is HostTraffic, which is a hash table, with linked lists
handling collisions.  It defaults to 16K and in a few cells you might
typically have chains of 10-20 hosts.  If you monitor a couple of /8s you
probably get more collisions.

Perhaps Benny would be willing to post his statistics?  He routinely runs
the largest installation anyone has publicly posted about, monitoring about
330K hosts.

-----Burton 

-----Original Message-----
From: ntop-dev-bounces at unipi.it [mailto:ntop-dev-bounces at unipi.it] On Behalf
Of Cole
Sent: Wednesday, November 16, 2005 2:28 AM
To: ntop-dev at Unipi.IT
Subject: RE: [Ntop-dev] Ntop Limits

Yeah.

I have read those, my question isnt about how much memory it uses. Its about
the limit of the data types or data structures if there is one? Does the
data get truncated after a certain point ?

Regards
/Cole 

-----Original Message-----
From: ntop-dev-bounces at unipi.it [mailto:ntop-dev-bounces at unipi.it] On Behalf
Of Burton Strauss
Sent: Wednesday, November 16, 2005 1:18 AM
To: ntop-dev at Unipi.IT
Subject: RE: [Ntop-dev] Ntop Limits

Read docs/FAQ - there are discussions about how ntop uses memory.  It's the
# of hosts, not the amount of traffic that matters for memory usage.

-----Burton
 

-----Original Message-----
From: ntop-dev-bounces at unipi.it [mailto:ntop-dev-bounces at unipi.it] On Behalf
Of Cole
Sent: Tuesday, November 15, 2005 1:41 PM
To: ntop-dev at Unipi.IT
Subject: [Ntop-dev] Ntop Limits

Hi.

Im running Ntop on FreeBSD 4.11. I wanted to know if there is a limit to the
amount of data/traffic that ntop can keep hold of. 

Like, does the amount of traffic or information or data that ntop can hold
depend on the data types used or data structures used? If Ntop was running
on a network with a few servers that generate between 6-10 terabytes of
data/traffic a day, would Ntop start to truncate the information/data
somewhere? Or is the only limitation based on the max amount of memory that
ntop is allowed to use, or that the box itself has?

Regards
/Cole


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