WEB-Interface performance

[Rob Moss]

Marcel Mitsuto Fucatu Sugano wrote:

> Hello again,
>
> On Thu, 2005-10-06 at 11:16 +0100, Rob Moss wrote:
>
>> Yeah, there are some CFLAGS you could be using to optmise your 
>> build.. I am assuming that you have a recent version of GCC, and that 
>> your P4 HT cpu is shown as having two logical CPU's
>>
>> Try rebuilding with the following command:
>>
>> cd  nagios-2.0b4
>> CC=gcc CFLAGS="-mtune=i686 -O3 -pipe -march=i686 -funroll-loops 
>> -ffast-math" \
>>     ./configure --prefix=/usr/local/nagios ...... [rest of nagios 
>> configure commands]
>
>
> I've tried this with no luck, having an error message displaying that 
> -ffast-math wasn't a recognized flag, with gcc-3.3.5. This was the 
> second try to handle the cgi's performance. The first thing we tryied, 
> was setting up a tmpfs mountpoint at /opt/nagios/var/tmpfs, and 
> pointed nagios to write the status file there, but again with some 
> errors that was a little weird, the cgi begins to ending prematurely 
> (apache errorlog), and displaying "500 internal server error". This 
> happened to 10% of the check_http running to test it :), and the 
> response time didn't get too much of a performace improvement as well.
>
> I don't think this could be Virtual Machine OS's fault, so the problem 
> might be with the status.cgi reading the tmpfs, but i can't tell for 
> sure, as we tried this setup yesterday. Is there anyone here who made 
> it? (status.dat been written in a tmpfs mountpoint?)


The flag -ffast-math is in GCC 3.4.2, but I had assumed it was part of 
the 3.x version of GCC.  You can simply omit that flag, and compiling 
should work again.  (I'm surprised you didn't do that yourself).

What you are getting into is not easy, you are off the beaten track and 
it will be a rocky ride until you get everything right.  When you see 
errors like an Apache 500 error, please look through the mailing list 
for common solutions before posting about it.

When you moved the status.dat file into the tmpfs volume, did you make a 
symlink from where the file came from (make a symlink from 
/opt/nagios/var/status.dat -> /opt/nagios/var/tmpfs/status.dat) ?

Also, when you talk about the Virtual Machine OS.. are you running the 
O/S under VMWare?  You do realise that Emulating an O/S is going to be 
slower and less stable, right?

Cheers
rob.

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