Topology

The topology file defines the datacenter hardware that OpenDT simulates.

File Location

Each workload includes a topology.json file:

workload/SURF/topology.json

Structure

{
  "clusters": [{
    "name": "C01",
    "hosts": [{
      "name": "H01",
      "count": 277,
      "cpu": {
        "coreCount": 16,
        "coreSpeed": 2100
      },
      "memory": {
        "memorySize": 128000000
      },
      "cpuPowerModel": {
        "modelType": "mse",
        "idlePower": 25.0,
        "maxPower": 174.0,
        "calibrationFactor": 10.0
      }
    }],
    "powerSource": {
      "carbonTracePath": "/app/workload/carbon.parquet"
    }
  }]
}

Cluster Configuration

Field	Description
name	Cluster identifier
hosts	List of host configurations
powerSource	Carbon intensity data source

Host Configuration

Field	Description
name	Host identifier
count	Number of identical hosts
cpu	CPU configuration
memory	Memory configuration
cpuPowerModel	Power model parameters

CPU Configuration

Field	Description
coreCount	Number of CPU cores per host
coreSpeed	CPU clock speed in MHz

Memory Configuration

Field	Description
memorySize	Memory capacity in bytes

Power Model Configuration

Field	Description
modelType	Model type: "mse", "asymptotic", or "linear"
idlePower	Power at 0% utilization (Watts)
maxPower	Power at 100% utilization (Watts)
calibrationFactor	Scaling factor (mse model)
asymUtil	Curve coefficient (asymptotic model)

Carbon Tracking

The powerSource.carbonTracePath points to a Parquet file with grid carbon intensity data over time. This enables carbon emission calculations.