[Chameleon] raster hang

[Ken Sanderson]

Just wanted to add a tidbit of info in case its useful.
 
I am running 1.99b on IIS. I have several large images. The largest I am
using is 128 megs. I also have an image catalog that can load 16 60-70
meg image tiles for over a gig of imagery. I use RGB image mode and
PC256 on another, with a PNG output. Images are all tiffs. I havent had
the problems you are having, it all seems to work well. 
 
My PHP limits are:
 
max_execution_time = 300
max_input_time = 300
memory_limit = 8M
 
Hopefully thats helpful in narrowing down the problem.
 
Ken

-----Original Message-----
From: chameleon-bounces at lists.maptools.org
[mailto:chameleon-bounces at lists.maptools.org] On Behalf Of Jacob Delfos
Sent: August 24, 2004 6:26 PM
To: Chameleon at lists.maptools.org
Subject: RE: [Chameleon] raster hang


Ken-Ichi,
 
It sounds a little bit like the problem I seem to have with rasters;
only happening every so many times, especially when there is more image
in view. I have it with ECW's and TIFF (45MB RGB). My map image fails,
and the session seems to hang, because I can't submit the page, but I
seem to be able to open a new session in another window without much
delay. I tried changing my settings in php.ini, but it had no effect. I
have 'patched' my problem by placing the OnError tag in the
mapDHTMLwidget image, invoking a function when it fails, which re-loads
the map image after a small delay. My diagnosis so far is that something
gets ahead of itself, serving the source to the client browser, and the
client browser requesting the image, before the image has begun being
rendered. You will find that the URL of your mapimage is valid.
 
I think it happens with PHP because it's slower than, for example,
mapserver. What is the size of your map image. Is it larger than
average, by any chance?
 
Jacob
 
 
 
-----Original Message-----
From: chameleon-bounces at lists.maptools.org
[mailto:chameleon-bounces at lists.maptools.org] On Behalf Of Ken-ichi
Sent: 25 August 2004 04:07
To: Chameleon at lists.maptools.org
Subject: Re: [Chameleon] raster hang
 


I should also mention that this problem is probably TIFF specific.  It 
does not occur when I use an Erdas Imagine (.img) format image of the 
same area, which is also about the same file size.
 
-Ken-ichi
 
Ken-ichi wrote:
 
> Thanks for responding, Paul.  I've actually set my php.ini file to be 
> very lenient on resource use for other purposes, so I doubt it's that:
>
> max_execution_time = 60
> max_input_time = 120
> memory_limit = 510M
>
> I did a little more testing and found that this also happens with 
> non-Chameleon phpMapScript (the MapLab non-ROSA preview app), and with

> other GeoTIFFs, but not with the mapserv CGI or the ROSA applet.  So 
> I'm guessing you were right to suspect the PHP side of things.  Any 
> more ideas, or should I take this to a more MapScript specific list?
>
> -Ken-ichi
>
> Ken-ichi wrote:
>
>> Hi folks.  I've started trying to add a GeoTIFF to my Chameleon app, 
>> and it really bogs it down, sometimes to a stand still.  The image 
>> I'm experimenting with is a 29mb unsigned 8bit GeoTIFF created in 
>> Erdas.  The hangs are most frequent when the tiff occupies the whole 
>> map, and when I say hang, I mean that the map just doesn't render.  
>> The hangs also seem to generate an httpd process that takes up a lot 
>> (>20%) of my CPU activity.  The relevant portion of my map file is 
>> pretty simple:
>>
>> LAYER
>>    NAME "Test Raster"
>>    TYPE RASTER
>>    DATA "/path/to/data.tif"
>>    STATUS DEFAULT
>> END
>>
>> I haven't specified an outputformat, except in the MAP section, where

>> I've set it to PNG (but I've switched around and that doesn't seem to

>> make much difference).  This problem does not seem to occur outside 
>> of Chameleon (everything works fine in MapLab's ROSA applet), and it 
>> doesn't happen every time the map is loaded  (although it inevitably 
>> happens if you refresh the map enough).
>>
>> Has anyone experienced this kind of behavior before?  Even better, 
>> anyone have any recommendations?
>>
>> -Ken-ichi
>>
>>
>> _______________________________________________
>> Chameleon mailing list
>> Chameleon at lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/chameleon
>
>
 
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