[Chameleon] raster hang

[Ken-ichi]

Actually, I just tried this with the demo app from the PHPMapScript By 
Example tutorial on the MapServer site (very, very simple), and it works 
fine, so maybe it's not PHPMapScript.  Since I'm only experiencing the 
problem with Chameleon and MapLab, could this be a problem with 
common/wrapper/drawmap.php?  Anyone at DM Solutions care to comment?  
Not that I'm ruling out some amazing screw up of my own or anything...

-Ken-ichi

Jacob Delfos wrote:

> 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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