Multi-instance

Cortex can be configured to provision different instance types to improve workload performance and reduce cloud infrastructure spend.

Best practices

Node groups with lower indices have higher priority.

1. Spot node groups should be listed before on-demand node groups.

2. CPU node groups should be listed before GPU/Inferentia node groups.

3. Node groups with small instance types should be listed before node groups with large instance types.

Examples

CPU spot cluster, with on-demand backup

# cluster.yaml

node_groups:
  - name: cpu-spot
    instance_type: m5.large
    min_instances: 0
    max_instances: 5
    spot: true
    spot_config:
      instance_distribution: [m5a.large, m5d.large, m5n.large, m5ad.large, m5dn.large, m4.large, t3.large, t3a.large, t2.large]
  - name: cpu-on-demand
    instance_type: m5.large
    min_instances: 0
    max_instances: 5

On-demand cluster supporting CPU, GPU, and Inferentia

# cluster.yaml

node_groups:
  - name: cpu
    instance_type: m5.large
    min_instances: 0
    max_instances: 5
  - name: gpu
    instance_type: g4dn.xlarge
    min_instances: 0
    max_instances: 5
  - name: inf
    instance_type: inf.xlarge
    min_instances: 0
    max_instances: 5

Spot cluster supporting CPU and GPU (with on-demand backup)

# cluster.yaml

node_groups:
  - name: cpu-spot
    instance_type: m5.large
    min_instances: 0
    max_instances: 5
    spot: true
    spot_config:
      instance_distribution: [m5a.large, m5d.large, m5n.large, m5ad.large, m5dn.large, m4.large, t3.large, t3a.large, t2.large]
  - name: cpu-on-demand
    instance_type: m5.large
    min_instances: 0
    max_instances: 5
  - name: gpu-spot
    instance_type: g4dn.xlarge
    min_instances: 0
    max_instances: 5
    spot: true
  - name: gpu-on-demand
    instance_type: g4dn.xlarge
    min_instances: 0
    max_instances: 5

CPU spot cluster with multiple instance types and on-demand backup

# cluster.yaml

node_groups:
  - name: cpu-1
    instance_type: t3.medium
    min_instances: 0
    max_instances: 5
    spot: true
  - name: cpu-2
    instance_type: m5.2xlarge
    min_instances: 0
    max_instances: 5
    spot: true
  - name: cpu-3
    instance_type: m5.8xlarge
    min_instances: 0
    max_instances: 5
    spot: true
  - name: cpu-4
    instance_type: m5.24xlarge
    min_instances: 0
    max_instances: 5