Enable register spilling to shared memory

[stephenswat]

CUDA 13.0 enables the PTX assembler to spill registers to shared memory instead of local memory, which should both be much faster, and also reduce the local memory usage of our fitting and finding kernels which are currently bottlenecking our throughput.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stephenswat]

I'm not 100% certain this works as intended like this, as this pragma is to be attached at the function scope. But we can try.

[beomki-yeo]

This is interesting as we are not actively using the shared memory in our finding and fitting kernels.
On the contrary, I hope the compiler is smart enough not to overuse the shared memory as this can reduce the number of concurrent blocks. (if we can limit the usage of shared memory from register spilling it would be great) Please let us know if there is any noticeable performance change

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stephenswat]

Physics performance summary

Here is a summary of the physics performance effects of this PR. Command used:

traccc_seeding_example_cuda --input-directory=/data/Acts/odd-simulations-20240506/geant4_ttbar_mu200 --digitization-file=geometries/odd/odd-digi-geometric-config.json --detector-file=geometries/odd/odd-detray_geometry_detray.json --grid-file=geometries/odd/odd-detray_surface_grids_detray.json --material-file=geometries/odd/odd-detray_material_detray.json --input-events=1 --use-acts-geom-source=on --check-performance --truth-finding-min-track-candidates=5 --truth-finding-min-pt=1.0 --truth-finding-min-z=-150 --truth-finding-max-z=150 --truth-finding-max-r=10 --seed-matching-ratio=0.99 --track-matching-ratio=0.5 --track-candidates-range=5:100 --seedfinder-vertex-range=-150:150

Seeding performance

Total number of seeds went from 33828 to 33828 (+0.0%)

Seeding plots

Track finding performance

Total number of found tracks went from 5565 to 5569 (+0.1%)

Finding plots

Track fitting performance

Fitting plots

Seeding to track finding relative performance

Seeding to track finding plots

Note

This is an automated message produced on the explicit request of a human being.