[mapserver-users] performance test of ECW tiles

[bartvde at xs4all.nl]

Hi list,

I have done a small performance test with an ECW file of 4,5 Gb. I did my
test with the Microsoft Web Application Stress tool for 1 minute. I have
done my test in two configurations:

1. a normal layer with just one ECW file
2. a tiled layer with 5 ECW tiles (each around 1 Gb)

results:

situation 1: 486 ms (122 hits in 1 minute)
situation 2: 586 ms (102 hits in 1 minute)

So my conclusion is there is little use in tiling ECW files for performance.

I also did not realize the big part DOWNLOAD takes in webmapping
performance. The gif files created are around 80 Kb so download will be in
the best case around 2 seconds. This is 4 times the time mapserver needs
to create the image.

Best regards,
Bart