Tamas,
I just gave this a try a few times - deleted the cache, and loaded one
tile. It seems to happen less frequently, but I still have about a 1 in
3 chance of getting various rectangle artifacts on the image. It
basically looks like something forgets to draw one or more of the rgb
colours.
Mike
Tamas Szekeres wrote:
Mike,
Did you experience the same problem when calling tile.php directly
when rendering an individual tile?
Best regards,
Tamas
2008/8/19 Mike Leahy <[EMAIL PROTECTED]>:
Hello list,
I'm wondering if anyone can help me figure out a problem I'm having with
corrupted output from from a tiled geotiff dataset I'm using in a ka-Map
environment. You can see what's happening to the imagery here:
http://img527.imageshack.us/my.php?image=corrupthd1.png
This generally happens when I'm zoomed in fairly close, and usually with
this high-resolution image dataset. However, I can get corrupted output for
other raster datasets (all geotiff, but not always tiled). It seems to
happen when the machine is processing most intensively (i.e., usually when
the imagery is being rendered by ka-Map). It also seems to be limited to
the laptop I am using, which is running F7-x86_64. In contrast, I have an
actual server (F8-x86_64), which has a virtually identical setup (with
respect to MapServer and its various dependencies), but with lots more cpu
cores and ram, and it's having no trouble at all (as far as I have noticed).
The corruption in the output from the same application my laptop is not
always the same - if I clear the cache for ka-Map and re-render the images,
I'll get similar artifacts appearing in the output (red, green, blue and/or
black rectangles), but they will vary in size and location. It happens for
both GD/AGG drivers, and JPEG/PNG output formats.
Until now, I figured it was just a problem with limited memory on my laptop
(it was always around 100% when rendering this imagery on the web service +
viewing the application in a browser), but now I've upgraded the ram -
there's plenty of spare room and I'm still getting the same problem. I just
finished upgrading Gdal from 1.5.0 to 1.5.2, and that didn't help any.
Basically, the only real differences I can think of between my laptop and my
server are the number of cpu cores (1 on my laptop vs. 8 on the server), and
possibly the versions of some of the underlying libraries in the system.
Does anyone know where I should start looking to find the cause of this?
Or perhaps somebody recognizes this problem, and knows what I might be
doing wrong...
Thanks for any suggestions,
Mike
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