[Tilesathome] WANTED: Tile viewing fastcgi written in C/C++

[Kai Krueger]

Michael Ritzert wrote:
> Hi spaetz,
> 
> spaetz wrote:
>>> I had started writing an apache module in C for the tileset stuff before
>>> I heard that Spaetz rewrote the entire server code. If it is helpful, I
>>> would be happy to continue on it again and adapt it to the new server
>>> layout. It would probably take a couple of days though till I find the
>>> time to finish of the testing. Please let me know if other people are
>>> working on it or if the memory consumption is no longer an issue to
>>> prevent duplicate effort.
>> I have done a (not so) quick (my last C coding was years ago) and ugly
>> fastcgi in ANSI C to serve tiles. And given that the t at h server has just
>> died again, I will try to use it ASAP when the server is up again.
> 
> I had a quick look at it and found that ripping everything from mod_example.c shipped with apache and implementing serving tiles (via sendfile, so no copy to userspace needed) is fairly easy. I have the stripped mod_example.c available, so if I can get my hands on your FastCGI C code, I may copy the relavant parts to the apache module. Is it availably in the SVN?


I have written a version of mod_tah and attached it to this mail. It is 
not particularly well tested (nor properly documented), but I hope it 
would work and has both the fall-back and the oceantiles lookup included.

Looking at apachebench, it seems roughly double the speed compared to 
the "old" mod_python serving. Trying to asses the memory consumption, it 
seems that apache processes dropped from about 14Mb to 7Mb of resident 
memory, but then there were not many processes at any time, so the 
overall saving doesn't seem significant.  All of this is hitting the 
same tile each time, so there is no disk IO involved, which may change 
this all completely.

I guess there were talks of moving over completely to lighthttpd, so I 
don't know if this implementation will ever be used, but I thought I'd 
just post it here for reference in case it might become useful. Also I 
don't know if it is any better than the fastcgi version.


Kai

> 
> Michael
> 
> 
> 
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