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.
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.
docker run \
--rm \
-v $(pwd):/dest \
golang:1.20.1 \
sh -c "
go install github.com/NVIDIA/mig-parted/cmd/nvidia-mig-parted@latest
mv /go/bin/nvidia-mig-parted /dest/nvidia-mig-parted
"
GO111MODULE=off go get -u github.com/NVIDIA/mig-parted/cmd/nvidia-mig-parted
GOBIN=$(pwd) go install github.com/NVIDIA/mig-parted/cmd/nvidia-mig-parted
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.
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.
nvidia-mig-parted apply -f examples/config.yaml -c all-1g.5gb
nvidia-mig-parted apply --mode-only -f examples/config.yaml -c all-1g.5gb
nvidia-mig-parted -d apply -f examples/config.yaml -c all-1g.5gb
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
cat <<EOF | nvidia-mig-parted apply --mode-only -f -
version: v1
mig-configs:
whatever:
- devices: all
mig-enabled: true
mig-devices: {}
EOF
nvidia-mig-parted export
nvidia-mig-parted assert -f examples/config.yaml -c all-1g.5gb
nvidia-mig-parted assert --mode-only -f examples/config.yaml -c all-1g.5gb
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
cat <<EOF | nvidia-mig-parted assert --mode-only -f -
version: v1
mig-configs:
whatever:
- devices: all
mig-enabled: true
mig-devices: {}
EOF
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