Blender 2.80 Classroom tilesize benching

Some tile size benches from Blender 2.80’s Cycles render with my 1700 & Vega 64 machine

Classroom demo, 100 samples, denoising defaults on, frame 3,
and obviously rendering with GPU

image

Tile size Render time
64x64 01:56.50
64x128 01:39.76
128x64 01:42.03
128x128 01:38.41
128x256 02:02.57
256x128 02:05.11
256x256 03:02.03
512x512 07:46.65

Screenshots

TL;DR
128x128 is the best with Classroom demo

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You can also check out the Blender Benchmark:

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I figured to test these myself because fast Googling claims that 512 is the best for Cycles GPU rendering, and my 512x512 did do something retarded 20mins and so I did just quit it :laughing:

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AFAIK optimal tile sizes depend on per-device basis.

All I know is small, power of 2 (around 32x32, 64x64) tiles are supposed to be good for CPUs. And yeah higher (like 512x512) are better for GPUs. But tests like this are very much appreciated, coz it let’s people with the same compute devices know optimal tile sizes without actually doing the hard work themselves :wink:

I’m going to render now that 512x512 :muscle:t2:

Tile size Render time
512x512 07:46.65

Imgur

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Think its that denoising whats changing things a bit, because 512x512 basically spitted out the whole picture, and then kept on doing nothing for 6-7mins, and spitted out again clear picture, but I dont care to test it right now

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ah yeah, might wanna do runs without denoising.