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Issues with read_png and/or profiler [message #81000]

Wed, 25 July 2012 08:51

hugh.ramp
Messages: 4
Registered: July 2012

Junior Member

Hi all,

I'm running a fairly straight forward image correlation program, which should run fairly quickly (~O(n^4), I believe). However, the complexity seems to be rising much quicker than that, an 962x722 image with a 30x29 kernel takes ~16 hours (with profiler on), whereas a 640x480 image with the same kernel takes ~1.5 hours.

Using profiler to determine the source for the complexity, I found that the Time self(ms) for read_png() was ~60,000,000ms, i.e., 99% of the runtime was loading in the image. However, time+sub(ms) reports taking only ~100ms. I was under the impression that Time+sub should always include time self, no? In any case, I don't think read_png should be taking nearly 16 hours to read a 700,000 pixel image.

I was able to recreate the problem on a separate computer using the same code.

Profiler Snapshot here: http://i.imgur.com/xJelD.png

Cheers and thanks,
Hugh

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		Issues with read_png and/or profiler By: hugh.ramp on Wed, 25 July 2012 08:51
		Re: Issues with read_png and/or profiler By: hugh.ramp on Wed, 25 July 2012 10:01

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