MIG Partiton Editor for NVIDIA GPUs

MIG (short for Multi-Instance GPU) is a mode of operation in the newest generation of NVIDIA Ampere GPUs. It allows one to partition a GPU into a set of "MIG Devices", each of which appears to the software consuming them as a mini-GPU with a fixed partition of memory and a fixed partition of compute resources. Please refer to the MIG User Guide for a detailed explanation of MIG and the features it provides.

The MIG Partiton Editor (nvidia-mig-parted) is a tool designed for system administrators to make working with MIG partitions easier.

It allows administrators to declaratively define a set of possible MIG configurations they would like applied to all GPUs on a node. At runtime, they then point nvidia-mig-parted at one of these configurations, and nvidia-mig-parted takes care of applying it. In this way, the same configuration file can be spread across all nodes in a cluster, and a runtime flag (or environment variable) can be used to decide which of these configurations to actually apply to a node at any given time.

As an example, consider the following configuration for an NVIDIA DGX-A100 node (found in the examples/config.yaml file of this repo):

version: v1
mig-configs:
  all-disabled:
    - devices: all
      mig-enabled: false

  all-enabled:
    - devices: all
      mig-enabled: true
      mig-devices: {}

  all-1g.5gb:
    - devices: all
      mig-enabled: true
      mig-devices:
        "1g.5gb": 7

  all-2g.10gb:
    - devices: all
      mig-enabled: true
      mig-devices:
        "2g.10gb": 3

  all-3g.20gb:
    - devices: all
      mig-enabled: true
      mig-devices:
        "3g.20gb": 2

  all-balanced:
    - devices: all
      mig-enabled: true
      mig-devices:
        "1g.5gb": 2
        "2g.10gb": 1
        "3g.20gb": 1

  custom-config:
    - devices: [0,1,2,3]
      mig-enabled: false
    - devices: [4]
      mig-enabled: true
      mig-devices:
        "1g.5gb": 7
    - devices: [5]
      mig-enabled: true
      mig-devices:
        "2g.10gb": 3
    - devices: [6]
      mig-enabled: true
      mig-devices:
        "3g.20gb": 2
    - devices: [7]
      mig-enabled: true
      mig-devices:
        "1g.5gb": 2
        "2g.10gb": 1
        "3g.20gb": 1

Each of the sections under mig-configs is user-defined, with custom labels used to refer to them. For example, the all-disabled label refers to the MIG configuration that disables MIG for all GPUs on the node. Likewise, the all-1g.5gb label refers to the MIG configuration that slices all GPUs on the node into 1g.5gb devices. Finally, the custom-config label defines a completely custom configuration which disables MIG on the first 4 GPUs on the node, and applies a mix of MIG devices across the rest.

Using this tool the following commands can be run to apply each of these configs, in turn:

$ nvidia-mig-parted apply -f examples/config.yaml -c all-disabled
$ nvidia-mig-parted apply -f examples/config.yaml -c all-1g.5gb
$ nvidia-mig-parted apply -f examples/config.yaml -c all-2g.10gb
$ nvidia-mig-parted apply -f examples/config.yaml -c all-3g.20gb
$ nvidia-mig-parted apply -f examples/config.yaml -c all-balanced
$ nvidia-mig-parted apply -f examples/config.yaml -c custom-config

The currently applied configuration can then be looked up with:

$ nvidia-mig-parted export
version: v1
mig-configs:
  current:
  - devices: all
    mig-enabled: true
    mig-devices:
      1g.5gb: 2
      2g.10gb: 1
      3g.20gb: 1

And asserted with:

$ nvidia-mig-parted assert -f examples/config.yaml -c all-balanced
Selected MIG configuration currently applied

$ echo $?
0

$ nvidia-mig-parted assert -f examples/config.yaml -c all-1g.5gb
ERRO[0000] Assertion failure: selected configuration not currently applied

$ echo $?
1

Note: The nvidia-mig-parted tool alone does not take care of making sure that your node is in a state where MIG mode changes and MIG device configurations will apply cleanly. Moreover, it does not ensure that MIG device configurations will persist across node reboots.

To help with this, a systemd service and a set of support scripts have been developed to wrap nvidia-mig-parted and provide these much desired features. Please see the README.md under deployments/systemd for more details.

Installing nvidia-mig-parted

At the moment, there is no common distribution platform for nvidia-mig-parted. However, we do build deb, rpm and tarball packages and distribute them as assets with every release. Please see our release page here to download them and install them.

To build from source, please follow one of the methods below.

Use docker with go install:

${DOCKER} run \
    -v $(pwd):/dest \
    golang:1.16.4 \
    sh -c "
    go install github.com/NVIDIA/mig-parted/cmd@latest
    mv /go/bin/cmd /dest/nvidia-mig-parted
    "

Run go get and go install directly:

GO111MODULE=off go get -u github.com/NVIDIA/mig-parted/cmd/nvidia-mig-parted
GOBIN=$(pwd)    go install github.com/NVIDIA/mig-parted/cmd/nvidia-mig-parted

Clone the repo and build it:

git clone http://github.com/NVIDIA/mig-parted
cd mig-parted
go build ./cmd/nvidia-mig-parted

When followed exactly, any of these methods should generate a binary called nvidia-mig-parted in your current directory. Once this is done, it is advised that you move this binary to somewhere in your path, so you can follow the commands below verbatim.

Quick Start

Before going into the details of every possible option for nvidia-mig-parted it's useful to walk through a few examples of its most common usage. All commands below use the example configuration file found under examples/config.yaml of this repo.

Apply a specific MIG config from a configuration file

nvidia-mig-parted apply -f examples/config.yaml -c all-1g.5gb

Apply a config to only change the MIG mode settings of a config

nvidia-mig-parted apply --mode-only -f examples/config.yaml -c all-1g.5gb

Apply a MIG config with debug output

nvidia-mig-parted -d apply -f examples/config.yaml -c all-1g.5gb

Apply a one-off MIG config without a configuration file

cat <<EOF | nvidia-mig-parted apply -f -
version: v1
mig-configs:
  all-1g.5gb:
  - devices: all
    mig-enabled: true
    mig-devices:
      1g.5gb: 7
EOF

Apply a one-off MIG config to only change the MIG mode

cat <<EOF | nvidia-mig-parted apply --mode-only -f -
version: v1
mig-configs:
  whatever:
  - devices: all
    mig-enabled: true
    mig-devices: {}
EOF

Export the current MIG config

nvidia-mig-parted export

Assert a specific MIG configuration is currently applied

nvidia-mig-parted assert -f examples/config.yaml -c all-1g.5gb

Assert the MIG mode settings of a MIG configuration are currently applied

nvidia-mig-parted assert --mode-only -f examples/config.yaml -c all-1g.5gb

Assert a one-off MIG config without a configuration file

cat <<EOF | nvidia-mig-parted assert -f -
version: v1
mig-configs:
  all-1g.5gb:
  - devices: all
    mig-enabled: true
    mig-devices: 
      1g.5gb: 7
EOF

Assert the MIG mode setting of a one-off MIG config

cat <<EOF | nvidia-mig-parted assert --mode-only -f -
version: v1
mig-configs:
  whatever:
  - devices: all
    mig-enabled: true
    mig-devices: {}
EOF