Cycles starts very slowly #88800

New Issue

CHET · 2021-06-03T16:03:08+02:00

CHET commented

2021-06-03 16:03:08 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: 84da05a8b8
Worked: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: 5be9ef4177

Short description of error
In version 2.93 Cycles starts very slowly, unlike version 2.91.2, where the render starts instantly

Exact steps for others to reproduce the error
uJfSwLxRGY.mp4

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: `84da05a8b8` Worked: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: `5be9ef4177` **Short description of error** In version 2.93 Cycles starts very slowly, unlike version 2.91.2, where the render starts instantly **Exact steps for others to reproduce the error** [uJfSwLxRGY.mp4](https://archive.blender.org/developer/F10155986/uJfSwLxRGY.mp4)

CHET commented

2021-06-03 16:03:08 +02:00

Added subscriber: @cheteron

Roger B commented

2021-06-03 20:22:32 +02:00

Added subscriber: @rboxman

Roger B commented

2021-06-03 20:22:32 +02:00

Are you attempting to use Optix? If so that will do a quite lengthy compile, but just once for each new version of blender. After compilation happens you should not see this on later launches. Can you confirm or deny that behavior and usage of Optix (or the Optix denoiser)?

CHET commented

2021-06-03 22:54:00 +02:00

In #88800#1170500, @rboxman wrote:
Are you attempting to use Optix? If so that will do a quite lengthy compile, but just once for each new version of blender. After compilation happens you should not see this on later launches. Can you confirm or deny that behavior and usage of Optix (or the Optix denoiser)?

without Optix, only denoiser

> In #88800#1170500, @rboxman wrote: > Are you attempting to use Optix? If so that will do a quite lengthy compile, but just once for each new version of blender. After compilation happens you should not see this on later launches. Can you confirm or deny that behavior and usage of Optix (or the Optix denoiser)? without Optix, only denoiser ![image.png](https://archive.blender.org/developer/F10156613/image.png)

Roger B commented

2021-06-03 23:09:20 +02:00

The Automatic setting is most likely defaulting to Optix denoising which is why you see the kernels compiling. If you let the compilation process complete (many minutes), do you see the long compilation step again after?

CHET commented

2021-06-04 00:02:25 +02:00

Only for the first time, but for a very very long time, a few minutes

Jesse Yurkovich commented

2021-06-23 20:13:44 +02:00

Added subscriber: @deadpin

Jesse Yurkovich commented

2021-06-23 20:13:44 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Jesse Yurkovich closed this issue

2021-06-23 20:13:44 +02:00

Jesse Yurkovich commented

2021-06-23 20:13:44 +02:00

The current behavior where Optix kernels need to be compiled is expected and will happen just once for each blender/driver version combination. Compilation will start when using Optix for the final render or when using Viewport denoising with the options set to Automatic or Optix.

Closing this now. If you notice compilation continuing to occur after you let it complete fully, feel free to create a new bug indicating this behavior and provide additional details on the exact version of blender and driver used and the timeline of Optix usage if possible.

The current behavior where Optix kernels need to be compiled is expected and will happen just once for each blender/driver version combination. Compilation will start when using Optix for the final render or when using Viewport denoising with the options set to Automatic or Optix. Closing this now. If you notice compilation continuing to occur after you let it complete fully, feel free to create a new bug indicating this behavior and provide additional details on the exact version of blender and driver used and the timeline of Optix usage if possible.

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Cycles starts very slowly #88800