Pypopsift crashes. Investigate.

[griwodz]

Excerpt from a comment by @hhackbarth in #160:

When I try to use it with the pypopsift wrapper from https://github.com/OpenDroneMap/pypopsift and an adapted CMakelists.txt file, also pypopsift builds successfully and can be installed (building wheels) using pip install . in the pypopsift folder. But when I run their example, I still get Segmentation fault (core dumped).

In the CMakelists.txt file I adapted the FetchContent_declare() part to:

FetchContent_Declare(
  popsift
  GIT_REPOSITORY https://github.com/alicevision/popsift/
  GIT_TAG        dev/cmake-native-cuda-jetson
)

This may be an issue related to pypopsift, but as they are only a wrapper, perhaps the popsift API somehow changed meanwhile and you already have an idea, how to fix that or tell me, what I am doing wrong?

Originally posted by @hhackbarth in #160 (comment)

[hhackbarth]

Thanks.
By the way: PyPopSift also crashed before PR #163, so there is no problem with that PR itself. And I can only speak for Jetson Orin NX (architecture 87).

[griwodz]

Oh, so it's a more basic problem.
I'm not sure if I'll have the time to learn enough about Python-C++-binding to search for such a bug.

Maybe the problem is void FeaturesHost::pin( ) in src/popsift/features.cu
I don't remember if cudaHostRegister is simply doing nothing for GPUs where cudaDeviceProp::integrated==true like the Tegra, or if it actually crashes.
If that's the origin of the problem, I could try to fix it as a follow-up to PR #157.