[Tilecache] setup tilecache under apache/linux...

[John Cole]

Ok, here are a few benchmarks...

HW: 2 identical servers, one running RHEL5 x64, the other W2K3r2 x64 
  2 quad core, 8GB, tiles on dedicated 15K raid 10 drives.  GB network
between servers and testing host.

Testing software: TestComplete 4 50 simultaneous users.  Each user pulling
20 tiles already in the cache.

Win CGI:  all users returned in 22-24 seconds.  Avg connection time 1 sec
Linux CGI: all users returned in 8-12 seconds.  Avg connection time .55 sec
Linux Mod_Python: all users returned in 6.3-6.8 seconds.  Avg connection
time .35 sec

All requests returned ok (AGS didn't fare too well on that mark, after 30
users, some requests failed, and we locked the server at 50 users).

I'll load remote exec software next week and bump the test up to 250 users
(the software only allows 50 users per testing machine).

John

-----Original Message-----
From: Christopher Schmidt [mailto:crschmidt at metacarta.com] 
Sent: Saturday, September 08, 2007 8:41 AM
To: John Cole
Cc: tilecache at openlayers.org
Subject: Re: [Tilecache] setup tilecache under apache/linux...

On Sat, Sep 08, 2007 at 08:32:50AM -0500, John Cole wrote:
> Well, things are staring to work for me :-)  I'm now down to TC issues
I've
> seen before.
> 
> Christopher, do you have a benchmark program for TC?  I'd like to compare
> our Win/CGI version to Linux/CGI and Linux/mod_python (the systems are
> identical and fairly beefy).

All my numbers are based on running the seed program (tilecache_seed.py)
-- it reports the number of tiles per second that it is loading. It's
not the most accurate benchmark in the world (since it does sequential
access), but it is a useful one.   

Other than that, I don't have anything.

Note that under mod_python, your Apache settings are really important:
You'll want to ensure NumRequestsPerChild is relatively high, since the
startup time for TileCache is somewhat high, especially with many layers
or if you are using Mapnik rendering.

Regards,
-- 
Christopher Schmidt
MetaCarta

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