Mention CMAKE_CUDA_ARCHITECTURES in main documentation or compile for more architectures?

[VRichardJP]

There is no mention of CMAKE_CUDA_ARCHITECTURES in the main documentation (https://koide3.github.io/glim/installation.html).

If user cmake is recent enough (>= 3.24), then CMAKE_CUDA_ARCHITECTURES=native is used in gtsam_points, which definitely looks like a sensible default. Unfortunatelly, the current cmake on Ubuntu 22.04 is slightly older so gtsam_points falls back to compute capability >= 8.0 here: https://github.com/koide3/gtsam_points/blob/529d1d190067a0c3176275f4cbaeb6bd23575d9c/CMakeLists.txt#L72

Considering the popularity of old Jetson TX2/nano and cie (which support compute <= 5.3), maybe it could be worth to:

• mention the necessity to set CMAKE_CUDA_ARCHITECTURES for old GPUs in the main documentation
• compile for older compute version by default
• or compile for many arch by default (BUILD_WITH_CUDA_MULTIARCH)
• or stop cmake configuration if CMAKE_CUDA_ARCHITECTURES is unset?

What do you think?

[koide3]

OK, I think it would be good do add a few more options to the default CMAKE_CUDA_ARCHITECTURES (53 62 87) to better support Jetson series. I'll make a PR soon. Do you think if we need more architectures?
https://github.com/koide3/gtsam_points/blob/529d1d190067a0c3176275f4cbaeb6bd23575d9c/CMakeLists.txt#L72

[VRichardJP]

I think these are good defaults

[koide3]

I just added several architectures to the default koide3/gtsam_points#54. I'll soon merge it.

set(CMAKE_CUDA_ARCHITECTURES 53 62 80 87 89 90 CACHE STRING "CUDA architectures" FORCE)