[Tilecache] High CPU Usage with TileCache on IIS 6

[chris marx]

I installed tilecache under mod_python, and I happy to say that making the
same number of requests barely registers on the system cpu! (~1%) Now on to
more rigorous load testing...

On Tue, Nov 18, 2008 at 4:10 PM, Christopher Schmidt <
crschmidt at metacarta.com> wrote:

> On Tue, Nov 18, 2008 at 04:07:08PM -0500, chris marx wrote:
> > Hi,
> >  I was wondering if anyone has experience with TileCache and IIS 6 and
> cpu
> > usage. I've been hitting a google map page that make around 30 tile
> overlay
> > requests to tilecache, and even when tilecache is retrieving cached tiles
> > (no calls to the WMS (which is on same server) which i validated looking
> at
> > IIS logs), the cpu usage goes up to 90-100%, albiet not for that long
> (maybe
> > a second or 2). Thats only one person hitting one page! Is this an iis
> > configuration issue, or should I just start installing apache....
>
> The latter. Each tile requires the Python startup time under IIS/CGI:
> you can't expect to serve more than about 15-20 tiles per secnd
> depending on your hardware setup under these circumstances.
>
> Specifically, on my relatively fast macbook, python startup is .03s --
> which would equate, with 30 tile loads, to your "1-2 seconds" -- 30 *
> .03 = 1s of CPU time.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
>



-- 

Chris Marx
Programmer/Analyst
Cornell Lab of Ornithology
159 Sapsucker Woods Rd.
Ithaca, NY 14850
t. 1.607.254.1142
http://www.birds.cornell.edu/
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