Set GPU to "Persistent Mode"

$ nvidia-smi -i <device id> -pm ENABLED

Constantly Monitor GPU Usage

$ nvidia-smi --loop=10

Encoder and Decoder

$ nvidia-smi -q | grep Encoder
$ nvidia-smi -q | grep Decoder

Constantly Monitor GPU's Encoder and Decoder

$ nvidia-smi -q --loop=10 | grep Encoder (or Decoder)

Monitor All the Processes Running on Each Device

$ nvidia-smi pmon

Monitor GPU Temperatures

$ nvidia-smi --query-gpu=temperature.gpu --format=csv 5 -l

Check GPU Connectivity Matrix

$ nvidia-smi topo -m

Display CLOCK

$ nvidia-smi -i <device id> -q -d CLOCK

note Pay attention to Clocks Throttle Reasons, and Clocks.