DepthMap Performance

[ChemicalXandco]

In https://scanbox.xyz/blog/alicevision-opensource-photogrammetry/ review, there is a chart comparing the computation speed to Reality Capture and Photoscan:

There is a big difference between Alicevision and the other 2.

When I look at the GPU + CPU usage on task manager it is all over the place: GPU is mostly on ~25% and peaks to ~75%. The CPU is much the same but mostly on ~50%

It needs optimising so that it uses as much available power as possible. I reckon it would get at least a 25% performance boost if it just uses all of the available processing power.

Platform: Windows x64
Hardware: i7 4790
GTX 1050 Ti
Version: 2.0.0

[snarkrans]

I got similar result. Meshroom have good quality, but very slow. Agisoft only on cpu works faster.

https://i.imgur.com/IT35CCA.png

[fabiencastan]

Yes, we are aware that the depth map computation does not make an optimal usage of the GPU. As you can see, we are working on it but that's not trivial to change.
If you have good CUDA knowledge, help on this aspect would be much appreciated.

[vilemduha]

is there a way for usual users to test this patch? Or would I have to build Alicevision from scratch?

[fabiencastan]

Yes, the only way is to build it.
I recommend you to wait at least for a merge in the "develop" branch before spending time on testing it, except if you are interested to contribute to it.

[nickpolet]

Would be great to hear if there has been any progress made on this front? I cannot believe how great the framework is, especially being able to run all the steps individually from code. Really flexible. The only issue is the speed. But I have patience, just wondering if there has been movement here.

[ChemicalXandco]

2019.1.0 appears to be almost twice as fast on depthmap then it was in 2018.1.0: 36 mins on 2018.1.0 and 20 mins on 2019.1.0 using the monstree dataset

[zhangalex]

Is there any update here?

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Entretoize]

Today the problem is still there, depthmap still use only 10% of my RTX3080 and 60% of my Ryzen 5, and is very, very long !

[kreendurron]

Seems to still be an issue?

[natowi]

Yes, the GPU utilization still has room for improvements.

However, the overall improvements over the last releases in the DepthMap node are considerable: