Nagios 2.0 performance

[Andreas Ericsson]

Ben wrote:
> Chained-hashing is on by default in nagios 2, and it works very well from 
> what I can tell. By *far* the biggest remaining time suck (for me, at 
> least) is in simply loading the data file off my ramdisk.
> 

That just can't be true. Loading a file from ramdisk is done in... 
well.. it's actually already loaded when the program asks for it, so the 
kernel only has to feed it whatever it asks for. As long as you stay off 
the swap, it's done in notime.

What takes the time is a linked list lookup, just as people have already 
stated. The status cgi's does a lookup for each of logentry it finds by 
simply comparing each and every one of the entries to its corresponding 
object. It's not exactly ultrafast. It's not even semifast or normally 
fast. It's just acceptable if you have < 400 hosts.


-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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