PM Sampling not enabled on RTX 4090

Developer Tools Nsight Compute
1

Hi,

I’m using Nsight Compute version 2024.3.2.0 on an Ubuntu system with the following configuration:

  • GPU: NVIDIA GeForce RTX 4090
  • Driver version: 565.57.01
  • CUDA version: 12.7
  • OS: Ubuntu 24.04

When running Nsight Compute, I found that PM Sampling is not enabled.
From the output from ncu --list-sections, most sections are marked as “not enabled”.

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I’d like to know:

  1. Is this expected for the RTX 4090?
  2. Are there specific driver, CUDA toolkit, or Nsight Compute configurations required to enable PM Sampling and other sections?

Thank you for your help!

2

What is enabled depends on your current selection of sets, sections and metrics. If you execute ncu --list-sections, only the sections that are part of the default set are enabled. If you execute ncu --set full --list-sections, you will find all sections that are part of the full set enabled, and so on.

E.g., you could collect you profile with ncu --set detailed --metrics ... --section PmSampling <app>, or ncu --set full <app>.

You can check here for where pm sampling is available.

3

Thanks a lot! I edited the command to check the full set. Now PmSampling is enabled, but PmSampling_WarpStates is still not. Is this expected on RTX 4090?

4

Yes. You can check which section is part of which set with ncu --list-sets, or by inspecting the .section file. PmSampling_WarpStates is part of the pmsampling set, but not part of the full set. In fact, there are a few sections for less common use cases that are not part of full. You can also combine individual sections and a set in a single command.

5

Thank you so much! I followed your suggestions and now I can see PmSampling_WarpStates is enabled.

Really appreciate your help!

6

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