WBPP Cosmetic Correction only uses one processor

M

mborland

Active member
I run PI on a 32-core machine under Ubuntu. When using Weighted Batch PreProcessor, I find all the steps use many cores except for Cosmetic Correction, which only uses CPU #0. For large image sets, this is very slow.

I verified that PI is using multiple cores for all the other operations by using the 'top' command. When Cosmetic Correction is running, the usage percentage of PI is 100% or less. For other operations, it is as high as 3200% (though it rarely hits that limit). I also verified that PI is not running out of memory (nowhere close).

--Michael
 
I also find that Subframe Selector (run outside of WBPP) only uses 1 core when outputting subframes. I don't remember this being the case before recent upgrades.

--Michael
 
Unlike most other calibration processes, CosmeticCorrection is not a "single pixel" process, since it samples other pixels in the neighbourghood of the pixel under evaluation. It may therefore be intrinsically single-threaded, and unable to use the multi-CPU architecture.
However, I don't see why you couldn't run multiple threads on separate frames (I think WBPP does this in other places).
 
fredvanner said:
Unlike most other calibration processes, CosmeticCorrection is not a "single pixel" process, since it samples other pixels in the neighbourghood of the pixel under evaluation. It may therefore be intrinsically single-threaded, and unable to use the multi-CPU architecture.
However, I don't see why you couldn't run multiple threads on separate frames (I think WBPP does this in other places).
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I'm pretty sure it used to use multiple cores in the previous version. I would have noticed this because it is *really* slow compared to the other operations.

--Michael
 
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