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I mentioned that NNEDI3's multi-threading was inefficient. I just realized it's weirder than that.
I'm running these scripts with AvsMeter to see how many threads are created. I'm running in MT mode with 8 threads.
This creates 16 threads.
nnedi3_rpow2(2, cshift="Spline16Resize", threads=1)
This creates 32 threads.
nnedi3_rpow2(2, cshift="Spline16Resize", threads=2)
This creates 128 threads.
nnedi3_rpow2(2, cshift="Spline16Resize", threads=1)
When running without MT and asking NNEDI3 to use a single thread, it creates 2 more threads.
What's going on here?
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