[Chameleon] raster hang

[Ken-ichi]

I'm running 1.99b2 on Gentoo Linux, using PHP 4.3.7, MS 4.2.2, and GDAL 
1.2.1.  I tried upping my PHP limits to what you've got, but to no avail.

-Ken-ichi

Ken Sanderson wrote:

> 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>
>     [mailto:chameleon-bounces at lists.maptools.org] On Behalf Of Ken-ichi
>     Sent: 25 August 2004 04:07
>     To: Chameleon at lists.maptools.org <mailto: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
>     >>
>     >>
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>     >
>     >
>      
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