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Fixed in 2019.2
Fixed in 2018.3, 2019.1
Votes
0
Found in
2018.3.5f1
2019.1.0a1
2019.1.0b1
2019.2.0a1
Issue ID
1123745
Regression
No
[Vulkan] Poor performance when using AsyncGPUReadback.Request
How to reproduce:
1. Open attached project
2. Choose Vulkan Graphic API
3. Enter the Play Mode
-- see that the frame rate is very low
4. Choose D3D11 Graphic API
-- frame rate is good
Reproducible with: 2018.3.5f1, 2019.1.0b2, 2019.2.0a4
Not compatible with 2017.4
Actual results: low frame rate
Expected results: normal frame rate
Notes: this happens in both the Editor and Build.
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Resolution Note (fix version 2019.2):
This was caused by the fact that CPU readbacks were using uncached memory heaps, making memory reads from them very slow. Changed them to use cached heap whenever available, bringing the performance to be comparable to DX11.