[Chameleon] Performance measuring question

Wed Apr 12 21:36:58 EDT 2006

Hi,
If you are confident in your PHP and Chameleon developper skills you can 
try to profile your application. A tool like xdebug 
(http://www.xdebug.org/) can be helpful, but you have to understand the 
ouput.

But the first place to look, like others said, is the mapfile. Remove 
the PROJECTION object and prefilter your vector and raster data to 
certain scales.

To help you optimizing your mapfile, try using a simple mapscript 
example instead of chameleon.
<?php
dl('php_mapscript.so');
$map_path="/var/www/html/ms/map_files/";

$map = ms_newMapObj($map_path."europe.map");
$starttime = microtime(1);
$image=$map->draw();
$endtime = microtime(1);
$image_url=$image->saveWebImage();

echo 'Drawn in '.($endtime-$starttime).' second.';
?>
<HTML>
<HEAD>
<TITLE>Example 1: Displaying a map</TITLE>
</HEAD>
<BODY>
     <IMG SRC=<?php echo $image_url; ?> >
</BODY>
</HTML>

Julien

Gambin Dejan wrote:
> Hi list,
> 
> I have finally finished my first serious Chameleon application. It is
> working very good, but I would like to see if there are possibly some
> performance problems that can be solved because I am experiencing slow
> map drawing sometimes (when zooming in)....I'll try to be more detailed:
> 
> My current application has several layers of which the one is raster
> layer defined over 12 tif files (40MB each) that I joined using
> tileindex..I have also internally tiled and created internal overviews
> on each of the tif files...
> 
> Next I have the main layer, that is roads...it is a LINE shape that has
> about 1MB (and its dbf has only 73KB with 247 records). This layer is
> also labeled with two lines, one is overlayed over the other...
> 
> My questions are:
> 
> 1. Since the data I presented shouldn't be "heavy" and assuming testing
> on my localhost - what can be the main reason for sometimes slow map
> drawing? I am using JSAPI mode
> 
> 2. How to debug it on Windows? How can I see what is causing this
> slowness? I would like to know if hardware is the reason (disk subsystem
> or RAM) or the application...
> 
> 3. I have created my own buttons and icons...maybe they are "heavy"? Are
> they somehow cached? What about the caching anyway?
> 
> Any suggestions are welcome
> 
> Thanks very much
> 
> regards, dejan
> 
> _______________________________________________
> Chameleon mailing list
> Chameleon at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/chameleon

-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/