Calculating number of active SMs

Developer Tools Nsight Compute
1

I want to calculate the number of active SMs (occupied SMs) during my kernel profiling using nsight-compute, what is an accurate way to do so?

2

Nsight Compute does not show per SM counter values. The average, minimum, and maximum number of active cycles can be collected with the metrics:

sm__cycles_active.avg
sm__cycles_active.max
sm__cycles_active.min

If sm__cycles_active.min == 0 then at least 1 SM was idle for the entire grid.

To convert the above metrics to a percentage of the grid execution (divide by sm__cycles_elapsed.avg) collect the metrics:

sm__cycles_active.avg.pct_of_peak_sustained_elapsed
sm__cycles_active.max.pct_of_peak_sustained_elapsed
sm__cycles_active.min.pct_of_peak_sustained_elapsed
3

Hi Greg,

Thanks for the prompt response.

so to get the average number of active SMs during grid execution, it would be:

sm__cycles_active.avg.pct_of_peak_sustained_elapsed* total no of SMs for a given arch (108 for a100)?