[OSM-dev] Apache + mapnik + mod_python problem

[Dane Springmeyer]

On Jun 28, 2010, at 9:18 AM, yvecai wrote:

> 
>>> The problem I have is that some tiles are properly rendered, but other are not, like in this example: http://yvecai.olympe-network.com/divers/Capture.png
>>>     
>> That is because each request is likely generating a child thread that is trying to share the same mapnik map, which is not good behavior, unless your python code is deployed as multiprocess (rather than multithreaded). If you are interested in multiprocess deployment see mod_wsgi, run in daemon mode, with threads=1 and processes=N CPU
>>   
> Thank you for your support Diane,

Dane actually. 

> I suspected something like that, but I'm far from expert in this field. Actually, I just wanted a local real-time rendering method to test rendering and I choose Sylvain's method because it was the most documented. I found the readme.txt from mod_tile is a little scary (any chance that I can make it work??).

Yes, I agree that the mod_tile readme doc needs improvement, but its not impossible. Just give it a try and let us know where exactly you get stuck.

> 
> At the end, the setup is working fine from yesterday evening.

huh? that is confusing.

> I tried to set up mod_tile with no luck, then I switch back to mod_python and I had just run generate_xml.py again to change some rendering rules.

Running generate_xml.py will have no effect on this problem AFAIK.

> That is not thread or processes related!

I'm pretty sure it is threading related.

> When I switch back to mod_python method, I probably tidied up the apache config files or something like that.

Well, in that case, maybe you could try to figure out what you changed and report back?

> 
> Yves