[mapserver-users] Runaway process and other wierdness

[Bruno Gendron]

Hi Tim, hello everyone,

I began having the same exact problems recently
(except from the scalebar bug), with ms3.5 (not cvs)
on Mandrake 8, Apache 1.3.X, php 4.0.5 and
php-mapscript. I'm not using the CGI version of
MapServer, only php-mapscript.

>From my experiments, if php encounters any error while
a mapscript session is in progress (in my case, my php
script had a small warning, not fatal, error that was
catched by an error management routine), the http
thread does not terminate properly, leading in a
thread "leak". After I solved this error, the leak
ALMOST disappeared, although i cannot certify that
this was only a coding issue on my behalf. Could it be
a "keep-alive" problem with php or apache?

Like you, I also get random map images from previous
requests appearing in my browser: even worse, other
users of the app sometimes get map images from each
other's requests!

2 possible explanations:

- Apache gets mixed-up with it's connections, sending
data on wrong connections (could it be possible!!!),
 
- or the map image filename created by Mapserver (in
my case php-mapscript) is not really UNIQUE filenames,
so one image gets could get cached by the browser and
displayed back later if the map image filename is the
same...

I will, this morning, modify my php scripts to
generate, from within php, a randomly generated
kind-of-unique filename to see if it solves anything.
I will also modify my app to send a bogus
randomly-generated http-post parameter to trick the
browser cache, and I will get back with my results...

--
Bruno Gendron


 --- Tim Sutton <sutton_t at giug.net> a écrit : > Hi
> 
> I am having a problem with mapserver (redhat 7.1 +
> apache module + php)
> where the server http threads for mapserver requests
> run away and hog
> all the processor time. This has been happening
> using the cvs version
> and ms3.4. This has only suddenly started happeining
> so I am not sure
> why? Any Ideas?
> 
> Also, I have another problem: If I browse around on
> one mapserver app
> on my server, then change the url in the same
> browser session to
> another mapserver app, I get images from the first
> app seemingly
> randomly dumped into the second. Has anyone
> encountered this? Another
> wierd thing it does is when I am zooming in to the
> map, a very
> enlarged version of the scalebar suddenly gets
> rendered in the
> mapwindow??
> 
> Any thoughts on how to resolve these problems will
> be greatly
> appreciated.
> 
> Regards
> 
> Tim Sutton
>  

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