host_name and service_description examples

[Ethan Galstad]

Andreas -

If you can implement Paul's hash function as a drop-in replacement 
for the current function in Nagios, that would be great.  I'll likely 
move the hash bucket size out to an option, so it can be tweaked from 
the main config file.

I don't want to spend too much time trying to optimize the CGI speed, 
as I am very much wanting them to disappear and be replaced by a new 
interface soon.  A DB backend makes the most sense for this, and 
projects like nagios-db are a good start.  I am also working on a new 
event broker module which will dump darn near everything from the 
Nagios daemon, as well as archived log files, into a normalized MySQL 
database (and possibly PostgreSQL later).  It should provide a good 
working base for new PHP/Perl interfaces for Nagios.  The code is 
still relatively new and under a good deal of development, but 
something public should appear in the next month or two.

At any rate, the new has function will still provide some speedups in 
the daemon after the CGIs are gone (although probably much less 
noticeable to overall performance).  I also plan on tweaking things 
in version 3, so that after startup, all object references are 
"normalized" with direct pointers to the objects they reference.


On 13 Jun 2005 at 11:37, Andreas Ericsson wrote:

> I've made some corrections to the benchmark code, and a couple of
> cheap optimizations. For those who want to test it for themselves (a
> whopping 3 downloads so far ;), I suggest you leech the new version
> from http://oss.op5.se/nagios/nagios-hash.tar.gz and give it a shake.
> 
> Ethan; If it's allright with you, I'll go ahead and implement Paul
> Hsie's hash. It looks up 1074600 hostname strings in 358msecs with the
> current table-size of 1024 buckets (compared to 987msecs for the
> additive hash currently in use). I'd also suggest wasting some memory
> here. Upping the hash-table size to 16384 buckets (64Kb on 32-bit
> archs) cuts another 40% off the average lookup time while staying
> fairly friendly to the hardware.
> 
> -- 
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Lead Developer


Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org



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