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...<br><br><div class="gmail_quote">On Tue, Nov 18, 2008 at 4:10 PM, Christopher Schmidt <span dir="ltr"><<a href="mailto:crschmidt@metacarta.com">crschmidt@metacarta.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">On Tue, Nov 18, 2008 at 04:07:08PM -0500, chris marx wrote:<br>
> Hi,<br>
> I was wondering if anyone has experience with TileCache and IIS 6 and cpu<br>
> usage. I've been hitting a google map page that make around 30 tile overlay<br>
> requests to tilecache, and even when tilecache is retrieving cached tiles<br>
> (no calls to the WMS (which is on same server) which i validated looking at<br>
> IIS logs), the cpu usage goes up to 90-100%, albiet not for that long (maybe<br>
> a second or 2). Thats only one person hitting one page! Is this an iis<br>
> configuration issue, or should I just start installing apache....<br>
<br>
</div>The latter. Each tile requires the Python startup time under IIS/CGI:<br>
you can't expect to serve more than about 15-20 tiles per secnd<br>
depending on your hardware setup under these circumstances.<br>
<br>
Specifically, on my relatively fast macbook, python startup is .03s --<br>
which would equate, with 30 tile loads, to your "1-2 seconds" -- 30 *<br>
.03 = 1s of CPU time.<br>
<br>
Regards,<br>
<font color="#888888">--<br>
Christopher Schmidt<br>
MetaCarta<br>
</font></blockquote></div><br><br clear="all"><br>-- <br><br>Chris Marx<br>Programmer/Analyst<br>Cornell Lab of Ornithology<br>159 Sapsucker Woods Rd.<br>Ithaca, NY 14850<br>t. 1.607.254.1142<br><a href="http://www.birds.cornell.edu/">http://www.birds.cornell.edu/</a><br>