Render time left not displayed in OpenCL rendering #48727

New Issue

mathieu menuet · 2016-06-24T10:03:32+02:00

mathieu menuet commented

2016-06-24 10:03:32 +02:00

System Information
Win 7 x64, R9 280X, Catalyst 16.3

Blender Version
Broken: fad0c336e4

Short description of error
Render time left is displayed in CPU mode, but not GPU mode when using OpenCL at least

Exact steps for others to reproduce the error
Hit F12 on default scene with cycles enabled. On CPU it shows time left, on GPU not.

**System Information** Win 7 x64, R9 280X, Catalyst 16.3 **Blender Version** Broken: fad0c336e44bdb4910c6dbeb8e2973f3695689f1 **Short description of error** Render time left is displayed in CPU mode, but not GPU mode when using OpenCL at least **Exact steps for others to reproduce the error** Hit F12 on default scene with cycles enabled. On CPU it shows time left, on GPU not.

mathieu menuet commented

2016-06-24 10:03:32 +02:00

Changed status to: 'Open'

mathieu menuet commented

2016-06-24 10:03:32 +02:00

Added subscriber: @bliblubli

Bastien Montagne commented

2016-06-24 11:05:34 +02:00

Added subscribers: @Sergey, @ThomasDinges, @mont29

Bastien Montagne commented

2016-06-24 11:05:34 +02:00

@Sergey, @ThomasDinges, one of you guys want to check this?

Lukas Stockner commented

2016-07-01 03:27:31 +02:00

Added subscriber: @LukasStockner

Lukas Stockner commented

2016-07-01 03:27:31 +02:00

Changed status from 'Open' to: 'Archived'

Lukas Stockner closed this issue

2016-07-01 03:27:31 +02:00

Lukas Stockner self-assigned this 2016-07-01 03:27:31 +02:00

Lukas Stockner commented

2016-07-01 03:27:31 +02:00

As far as I can see, that's not a bug, but a currently missing feature.

The problem here is that for CPU/CUDA/Megakernel-OpenCL, one sample is rendered after the other. Therefore, it's pretty easy to estimate the remaining time.
For the Splitkernel-OpenCL mode, which is used on e.g. AMD cards, that's not so easy - it essentially processes a whole block of samples at once to keep the GPU occupied. That makes it hard to tell exactly how many samples have been rendered already.
It would be pretty easy to estimate the remaining time just based on the number of tiles that was rendered already - but since GPUs tend to be faster with few large tiles instead of many small ones, that probably is neither accurate nor helpful.

So, I'd rather consider this a ToDo - it should definitely be added at some point, but it's not totally clear how to do so.

As far as I can see, that's not a bug, but a currently missing feature. The problem here is that for CPU/CUDA/Megakernel-OpenCL, one sample is rendered after the other. Therefore, it's pretty easy to estimate the remaining time. For the Splitkernel-OpenCL mode, which is used on e.g. AMD cards, that's not so easy - it essentially processes a whole block of samples at once to keep the GPU occupied. That makes it hard to tell exactly how many samples have been rendered already. It would be pretty easy to estimate the remaining time just based on the number of tiles that was rendered already - but since GPUs tend to be faster with few large tiles instead of many small ones, that probably is neither accurate nor helpful. So, I'd rather consider this a ToDo - it should definitely be added at some point, but it's not totally clear how to do so.

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Render time left not displayed in OpenCL rendering #48727