Loading render kernels time increase from 20s to 6m45s (Apple Metal) #100102
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Reference: blender/blender#100102
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System Information
Operating system: macOS-12.2.1-arm64-arm-64bit 64 Bits
Graphics card: Apple M1 Max Apple 4.1 Metal - 76.3
Blender Version
Broken: version: 3.3.0 Beta, branch: master, commit date: 2022-07-30 06:17, hash:
8ae14bc1d7Worked: 3.2.1
Short description of error
Not sure if this is a bug or if this is expected with the new metal optimisations, but the initial 'loading render kernels' when first starting blender has increased from 20s in 3.2.1. to 6m45s in 3.3 beta.
Exact steps for others to reproduce the error
Start Blender
Switch to cycles and gpu rendering (metal)
Enable rendered view
Added subscriber: @blenderrocket
Added subscriber: @PratikPB2123
Changed status from 'Needs Triage' to: 'Needs User Info'
Thanks for the report. Upgrade macOS version and see if that makes any difference.
Upgraded to 12.5, still takes about 6m30s.
Added subscriber: @Memento
Added subscriber: @mano-wii
@mano-wii , can you confirm this?
Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'
I can confirm a much longer kernel compile time in recent builds.
6 minutes (with no warning or progress) really seems like a lot, but I can't say if this is a bug, since the kernels are cached and this delay only happens the first time we use a new version of Blender.
This must be some side effect of some recent optimization in the rendering itself.
System Information
Operating system:
macOS-12.2-arm64-arm-64bit 64 BitsGraphics card:
Apple M1 Apple 4.1 Metal - 76.3Added subscriber: @ikester_blender
I can also confirm this. MacBook Pro M1 Max. MacOS 12.5. Not quite 6 minutes, but it spent about 4 minutes in rendering kernels and about 1 minute "Updating Device".
This is more than an order of magnitude slower to render kernels. Did Cycles change that much between 3.2 and 3.3?
Added subscriber: @Nurb2Kea
Sorry, right at the moment when I got the mail for this issue, I send my one over here.
https://developer.blender.org/T100450
Hi, your report may or may not be same as this one.
How much render time it takes in 3.2 and older versions?
This issue was referenced by
e11c899e71Added subscribers: @Michael-Jones, @brecht
This is a known thing to help improve render times, but given the feedback we may want to back out of it.
@Michael-Jones, what do you think about removing the inlining changes from
intern/cycles/kernel/device/metal/compat.hfor 3.3, but leaving the other optimizations intact?More aggressive inline could then be done in the future along with for shader specialization, with an option that users explicitly enable.
Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'
Added subscriber: @extrup-1
On my M1Max MBP, kernels failed to load when only the GPU is selected as the render device and took about 4:45min to load when both GPU and CPU are selected.
Changed status from 'Confirmed' to: 'Resolved'
I've reverted it now since we are so close to the release and so we don't wait too long with testing changes like this.
Removing the inlining brought it right back down: August-19 build Rendering Kernels and Update Device: 24 secs. on an MacBook Pro 16", M1 Max, 32 GB.
But why does the viewport lose the retina resolution in Rendered mode? :)
@ikester_blender, there's a setting in the Performance > Viewport panel to control that.