# Multi-node parallel job
<a name="example-mnp-job-definition"></a>

The following example job definition illustrates a multi-node parallel job. For more information, see [Building a tightly coupled molecular dynamics workflow with multi-node parallel jobs in Amazon Batch](https://amazonaws-china.com/blogs/compute/building-a-tightly-coupled-molecular-dynamics-workflow-with-multi-node-parallel-jobs-in-aws-batch/) in the *Amazon Compute* blog.

```
{
  "jobDefinitionName": "gromacs-jobdef",
  "jobDefinitionArn": "arn:aws-cn:batch:us-east-2:{{123456789012}}:job-definition/gromacs-jobdef:1",
  "revision": 6,
  "status": "ACTIVE",
  "type": "multinode",
  "parameters": {},
  "nodeProperties": {
    "numNodes": 2,
    "mainNode": 0,
    "nodeRangeProperties": [
      {
        "targetNodes": "0:1",
        "container": {
          "image": "{{123456789012}}.dkr.ecr.us-east-2.amazonaws.com/gromacs_mpi:latest",
          "resourceRequirements": [
              {
                  "type": "MEMORY",
                  "value": "24000"
              },
              {
                  "type": "VCPU",
                  "value": "8"
              }
          ],
          "command": [],
          "jobRoleArn": "arn:aws-cn:iam::{{123456789012}}:role/ecsTaskExecutionRole",
          "ulimits": [],
          "instanceType": "p3.2xlarge"
        }
      }
    ]
  }
}
```