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Florian Perret avatar image
Florian Perret asked ·

Threadripper 2990wx and contour filter slow

Hello,

I'm rendering with aitoon and need contour filter. I works fine on an Intel CPU , always 100% cpu usage during render, but with a 2990wx from AMD is around 4 times slower ( between 10% and 25% cpu usage actually ). Could it be related to the windows bug ?

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David Hughes avatar image
David Hughes answered ·

Trying to use contour filter in C4D Arnold and it's unusable with Threadripper 2990wx. Slightly quicker reducing the number of threads but it still takes a simple toon scene (using gaussian) filter from a 3 second render to almost 3 mins per frame. It was over 3 mins auto thread detection.

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Florian Perret avatar image
Florian Perret answered ·

So what can we do ? It’s really bothe

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Grant Kim avatar image
Grant Kim answered ·

Sounds like some yet another Windows' NUMA allocation bugs.

BTW I can confirm this too.

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Nebur Ayar avatar image
Nebur Ayar answered ·

Same problem here... too slow with 2990wx.

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Florian Perret avatar image
Florian Perret answered ·

Thanks for your reply.It didn't help , still not at 100% while rendering on the AMD. Also I noticed that renderin empty space is also super slow, is there a way to tell Arnold to not render empty space ?

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Thiago Ize avatar image
Thiago Ize answered ·

If you use the same number of threads as on the old Intel CPU, is it still much slower? We've gotten this report before and halving the number of threads to 32 made it 3x faster. My suspicion is that we just haven't optimized the contour filter to running on many threads. This is definitely something we'd like to fix.

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