Quoting Khánh V? <vudinhkhanh1...@gmail.com>:
I want say question about server:
When I test online to compare 2 imgage using SURF on
http://demo.ipol.im/demo/69/ I waste about 10s. But when I download code
and run it in my computer It run 150s. My computer CPU core i3. I don't
understand.
Dear Khánh V,
One technique used in many programs to speed up is symmetric
multiprocessing [1], where many units of the CPU (called "cores")
execute different parts of the program at the same time.
Let's assume that your Core i3 CPU has 4 cores (or technically, 2 real
cores which at the end it's 4 hyperthreaded cores) running at 1.20 GHz.
The IPOL server running that demo has 32 cores running at 2.27 GHz.
Thus, a very rough estimate gives that an execution of 10 seconds in
the IPOL server would take (approximately) 10 * (32 / 4) * (2.27/1.20)
= 151 seconds in that hypothetical i3 CPU.
In short, the more cores a system has, the faster it'll go. Assuming
that it can be well parallelized, of course.
Best,
Miguel
[1] https://en.wikipedia.org/wiki/Symmetric_multiprocessing
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