[Chameleon] Performance measuring question

Thu May 4 08:08:29 EDT 2006

Hi,
If all PROJECTION object are the same in your mapfile you can leave them 
there. If the layer projection string is the exact same thing as the map 
PROJECTION, the layer will not be reprojected (It's like it is not 
there). But every single characters are important, even a single white 
space, so make sure they are identical.

Julien

Gambin Dejan wrote:
> Hi Julien,
> 
> You told me to remove the PROJECTION object in map file but then I have
> problems with some widgets (QuickZoom for example). Can it be solved? Or
> is wiser to leave the PROJECTION parameter in map file? I wanted to
> remove it because all my data are in the same projection so maybe I
> could gain some performance benefits...
> 
> dejan
> 
> 
>>-----Original Message-----
>>From: Julien-Samuel Lacroix [mailto:jlacroix at mapgears.com] 
>>Sent: Thursday, April 13, 2006 3:37 AM
>>To: Gambin Dejan
>>Cc: chameleon at lists.maptools.org
>>Subject: Re: [Chameleon] Performance measuring question
>>
>>
>>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/
>>
> 
> 
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-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/