D4R_CUDA_LAUNCH_STATS=1 synchronizes after and dumps every argument of every
launch, which costs about 1.2 GB and 5 s per frame - fine for a one-off
inventory, too much for the edit/measure loop of a single kernel.
D4R_CUDA_LAUNCH_STATS_FILTER=<substring> keeps only the kernels whose name
contains it, and is checked before the synchronize so the rest of the frame is
neither waited on nor written.
Verified: with the filter set to swin_enc0 the dump is 54 files / 839 MB
instead of 314 / 3.7 GB, the run takes 5 s instead of 17, and the 54 argument
files are byte-identical to the ones the unfiltered run produced.
woutermans
1a9762bb0e