Contra another comment: fairly low. (Or at least my search-fu has not been able to find any CVEs or published papers about breaking isolation between MIG instances. MPS should be generally be used only by one user so multiple of their own CUDA apps can attach to one (v)GPU.)
MIG is used a lot in HPC and multi-tenancy cloud, where isolation is important. See Figure 1 and ยง6.2:
The card is actually sliced into different instances (show up as different /dev/nvidiaXs), each with their own SMs, L2, and DRAM, that are isolated between each one. (MPS is for the same user to share a GPU instance: allows multiple CUDA apps to attach and time-slicing occurs.)
MIG is used a lot in HPC and multi-tenancy cloud, where isolation is important. See Figure 1 and ยง6.2:
* https://docs.nvidia.com/datacenter/tesla/mig-user-guide/
The card is actually sliced into different instances (show up as different /dev/nvidiaXs), each with their own SMs, L2, and DRAM, that are isolated between each one. (MPS is for the same user to share a GPU instance: allows multiple CUDA apps to attach and time-slicing occurs.)