MapServer performance issue

[Julien-Samuel Lacroix]

Hi guys,

For bug 1224, I made some profiling. The results are interesting. Add
yourself in CC if you are interested or if you have any idea (or better
idea of what have been suggested) to fix them.
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1224

My result (from bug 1224):

I made a lot of profiling in mapserver for this bug. My tests were based
on 50 consecutive call to mapserv CGI 4.0 and 4.5. I used the gmap
mapfile. My profiler as gprof.

This gave me the following result:
4.0: 6.18 sec for 50 requests.
4.4: 7.56 sec for 50 requests.
This gives a diference of 1.38 sec.

In that, I found that the main differences were in a GD function
(gdImageStringFT in msDrawTextGD) (1.66 sec with 4.0 vs 2.51 sec with
4.4), and in all access to points object (around 0.45 sec lost overall).

The lost in msDrawTextGD is due to 7 calls to gdImageStringFT instead of
3 calls in 4.0.  This problem will be discussed in bug 1243.
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1243

The lost of performance due to point objects manipulation is due to the
addition of the z parameter in the point object. A solution for this
will be discussed in bug 1244.
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1244

I made a test by resolving both issue like proposed in the two bugs and
it end with this result:
4.4: 6.20 sec for 50 requests
4.0: 6.52 sec for 50 requests

Thanks
Julien
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Julien-Samuel Lacroix            jlacroix at dmsolutions.ca
DM Solutions Group               http://www.dmsolutions.ca/
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