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Actual exam question for NVIDIA's NCA-AIIO exam Question #: 34 Topic #: 2
A company is using a multi-GPU server for training a deep learning model. The training process is extremely slow, and after investigation, it is found that the GPUs are not being utilized efficiently. The system uses NVLink, and the software stack includes CUDA, cuDNN, and NCCL. Which of the following actions is most likely to improve GPU utilization and overall training performance?
Increasing the batch size (D) is most likely to improve GPU utilization and training performance. Larger batch sizes allow GPUs to process more data per iteration, maximizing compute throughput and reducing idle time, especially with NVLink's high-bandwidth inter-GPU communication. This leverages CUDA, cuDNN, and NCCL efficiently, assuming memory capacity permits. * Mixed-precision training(A) boosts efficiency but may not address low utilization if batch size is the bottleneck. * Disabling NVLink(B) slows communication, worsening performance. * Updating CUDA(C) might help compatibility but not utilization directly. NVIDIA recommends batch size tuning for multi-GPU setups (D).
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