[dev] SOLVED: performance problems with horde

[Andy Dorman]

On 06/14/2015 02:57 PM, Sebastian Birnbach wrote:
> All,
>
> thanks again for bearing with me. I finally (!!) solved my performance
> problems and they were - surprise! - related to DNS.
>
> In resolv.conf I had defined a secondary nameserver that now turned out not
> to respond at all. For some reason it got queried every time Horde
> processed a HTTP request. I have no clue
> * why the secondary DNS was called at all
> * why the secondary DNS was queried before the primary and
> * why this didn't affect other PHP applications like phpMyAdmin.
> Af any of you dev guys wants to know more I am ready to perform any test
> you like.
>
>
> I also noticed that pear application DNS2 throws errors like this on every
> request:
>
> Jun 14 21:35:00 max HORDE: PHP ERROR: Undefined offset: 1 [pid 6887 on line
> 416 of "/usr/local/share/pear/Net/DNS2.php"]
>
> I experimentally put some debugging code two lines above the referenced
> statement to dump $line and this it what it yields:
>
> Jun 14 21:41:51 max HORDE: line is [removed name of domain in this example]
> Jun 14 21:44:55 max HORDE: line is nameserver 192.168.0.10
> Jun 14 21:44:55 max HORDE: line is options:timeout:1
> Jun 14 21:44:55 max HORDE: PHP ERROR: Undefined offset: 1 [pid 6934 on line
> 418 of "/usr/local/share/pear/Net/DNS2.php"]
>
> It seems like the timeout options for a DNS query doesn't get processed
> properly. The default timeout seems to be 5 seconds, which makes the
> picture complete:
>
> + HTTP request coming in
> + DNS lookup is done on secondary DNS
> + processing of timeout = 1 second fails so that timeout = 5 seconds
> + after 5 seconds the primary DNS is queried
> + processing continues with good speed.
>
>
> Well, well, well, this little problem kept me way too long but finally I
> mastered it. Feel free to comment (or congratulate :)
>
>    Sebastian

Congratulations!  :-)

-- 
Andy Dorman