Hello world,
My first post here… Just tested 2.90 and I see an abnormally in CPU only cycle render performance. My test was using Dual Xeon E5-2620 (12 Core, 24 Thread) with 32GB ram. Using the same Hardware, I tested 2.83 & 2.90 under Windows 10 & Ubuntu 20.04.1 LTS.
Most of the test results are as expected, which 2.90 is faster (or slightly faster) than 2.83 under the same OS. However, I notice 2 tests failed my expectation… To be sure, I have ran these tests multiple times and all come out with similar numbers.
bmw27 (Windows)
2.83 - 338.471
2.90 - 373.272
koro (Windows)
2.83 - 581.214
2.90 - 996.716
Koro scene is the biggest surprise for me, it runs much slower in 2.90 (tested multiple times, on the same OS install that runs 2.83 just to be sure) I searched opendata.blender, and I found similar test results tested with AMD Ryzen 5 2600X
koro (Windows, not my test numbers, but from opendata)
2.83 - 582.596 (Slowest) 495.868 (Fastest, OC?)
2.90 - 815.995
BUT on the other hand, 2.90 also shows improvements especially under Linux
koro (Linux)
2.83 - 575.301
2.90 - 431.196
victor (Linux)
2.83 - 2039.67
2.90 - 1505.7
victor (Windows)
2.83 - 2109.77
2.90 - 1868.57
fishy_cat
2.83 - 582.871 (Windows)
2.83 - 580.339 (Linux)
2.90 - 584.746 (Windows)
2.90 - 480.299 (Linux)
In short, running 2.90 under Linux gives the best results for all 6 tests. And Koro scene seems to only suffer under Windows. My blender-fu is not great, what’s special in that scene that may cause the slowdown?