Summary: Currently we treat this attribute as a minimum number for the amount of blocks scheduled on the kernel. However, the doucmentation states that this applies to CTA's mapped onto a *single* SM. Currently we just set it to the total number of blocks, which will almost always result in a warning that the value is out of range and will be ignored. We don't have a good way to automatically know how many CTAs can be put on a single SM nor if we should do this, so we should probably leave this up to users manually adding it. https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#performance-tuning-directives-minnctapersm
The LLVM Compiler Infrastructure
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