I just run a toy example on my machine with 2 processes and i got:
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0    882788      C   ...cal/miniconda3/envs/pytorch3/bin/python   945MiB |
|    1    882789      C   ...cal/miniconda3/envs/pytorch3/bin/python   945MiB |
+-----------------------------------------------------------------------------+