Hello, I’m currently profiling the kernel, and NCU doesn’t shows the live register, while other metrics are displayed. (No live register in every kernel I profiled) In addition, my kernel has huge register pressure, and I wonder there is some solution that I can identify where is the bottleneck(I modify some code from baseline, than huge register pressure is introduced)
What version of ncu are you using, and what version of CUDA was this application compiled with?
Do you see any warning regarding static analysis being disabled for certain functions in your workload? If so, try changing the Kernel Analysis Size Threshold in the options.
Thanks for your help.
I’m now using the 2025.3.0.0 in macOS(sillicon) for viewing the file, and 2025.1.1.0 in linux for profiling in the target machine. I also tried to match the version of two environment, but still doesn’t work.
Although I don’t see warning about it, I also adjusted the Kernel Analysis Size Threshold to -1, and use remote-profiling, but live register doesn’t appears, though.
Could my macOS(sillicon) environment incur this situation?
Would you be able to (compress and) upload the report for checking on our end?
Thank you very much for your kind help.
The first file, local.ncu-rep, was profiled on the target machine via ncu-cli (since ncu-cli does not provide the kernel analysis threshold preference, I did not adjust it).
I will upload the report obtained through remote profiling (with both environments matched to version 2025.1.1.0) as soon as possible. As I deleted the previous report, re-running remote profiling currently causes some errors, so I will profile it on another machine.
local.ncu-rep.zip (3.1 MB)
I opened the report on Linux x86_64 and Mac Arm64 with Nsight Compute 2025.3.0, and I do see Live Registers reported for the SASS view. (There is no Source view for me, since this app was apparently built w/o lineinfo, and profiled w/o –import-source yes option.
Sorry for the inconvenience. I mistakenly uploaded the wrong file earlier. However, with this file, I still cannot see the live registers, while other metrics are visible (on Mac Arm64 with Nsight Compute 2025.3.0). I think this may be due to my machine configuration (for some reason), although the report contains the full information. So I will try opening it on a Windows machine and ask again if the problem still remains. Thank you for your help.
It works well on Windows x86_64. I believe the issue lies in the Mac Arm64 environment. Thank you again for your help.
I’ve got clear solution. When I normally open the Nsight Compute, I cannot see “live register” metric, and the application always ask me “Help Improve …”, which means that the application cannot remember any settings.
When I open the application with “sudo /Applications/NVIDIA\ Nsight\ Compute.app/Contents/MacOS/ncu-ui”, I can see the live register and the settings are also saved normally.