Free NVIDIA NCP-AIN Actual Exam Questions - Question 8 Discussion
Which of the following NCCL environment variables enable SHARP aggregation with NCCL when
using the NCCL-SHARP plugin?
Pick the 2 correct responses below
I don't think A fits since CollNet isn't the same as SHARP, so D and maybe C? D
Probably D and A. D looks like it’s specifically for SHARP auto initialization, which fits the question perfectly. A seems right because enabling CollNet is often linked with SHARP aggregation in NCCL setups, even if it’s not exactly the same tech. B is out since CollNet and SHARP are different, and C doesn’t seem related at all. So the combo of A and D makes the most sense from what I’ve seen.
It’s definitely not B since that’s for CollNet, which is a separate tech from SHARP. C also looks unrelated—NCCLSPECTRUM_ENABLE doesn’t tie into SHARP plugins. So A and D are the only ones that make sense here because NCCL_COLLNET_ENABLE enables collective network features generally, and NCCL_SHARP_AUTOINIT specifically handles SHARP aggregation initialization. That lines up with what I remember from the docs and previous setups.
Makes sense to rule out B and C here, so I’d go with A and D too.
A and D seem right because CollNet and SHARP are different techs, so B doesn't fit. Also, C isn't related to SHARP from what I've seen.
Looks like the right answers are A and D for enabling SHARP with NCCL. B is for CollNet, not SHARP.