Nagios 2.0 performance

[Ben]

Now that Nagios 2 uses a GTree instead of a linked list, the lookup 
isn't so bad, actually. Even modifying the tree isn't so bad. What 
takes time is parsing 20MB of text. It helps that the text is being 
held in a ramdisk, but it's still text, and nagios needs to convert it 
before it does anything usual with it.

On Sep 8, 2004, at 4:46 PM, Andreas Ericsson wrote:

> 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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