Increase the container resources - Distributed Load Testing on AWS
Create a new task definition revisionUpdate the DynamoDB table

Increase the container resources

To increase the number of concurrent virtual users (concurrency) your load tests can simulate, you need to increase the CPU and memory resources allocated to each Amazon ECS task. This involves creating a new task definition revision with higher resource limits, then updating the solution’s DynamoDB configuration to use the new task definition for future test runs.

Create a new task definition revision

Follow these steps to create a new task definition with increased CPU and memory resources:

  1. Sign in to the Amazon Elastic Container Service console.

  2. In the left navigation menu, select Task Definitions.

  3. Select the checkbox next to the task definition that corresponds to this solution. For example, [replaceable]<stackName>`-EcsTaskDefinition-<system-generated-random-Hash>.

  4. Choose Create new revision.

  5. On the Create new revision page, take the following actions:

    1. Under Task size, modify the Task memory and Task CPU to your desired values. Higher values allow more concurrent virtual users per task.

    2. Under Container Definitions, review the Hard/Soft memory limits. If this limit is lower than your desired memory, choose the container.

    3. In the Edit container dialog box, go to Memory Limits and update the Hard Limit to match or be less than your task memory allocation.

    4. Choose Update.

  6. On the Create new revision page, choose Create.

  7. After the task definition is successfully created, record the complete task definition ARN including the version number. For example: [replaceable]<stackName>`-EcsTaskDefinition-<system-generated-random-Hash>:[replaceable]<system-generated-versionNumber>.

Update the DynamoDB table

After creating the new task definition revision, you must update the solution’s DynamoDB table so that future test runs use the new task definition. Repeat these steps for each AWS Region where you want to use the updated task definition:

  1. Navigate to the DynamoDB console.

  2. From the left navigation pane, select Explore Items under Tables.

  3. Select the scenarios-table DynamoDB table associated with this solution. For example, [replaceable]<stackName>`-DLTTestRunnerStorageDLTScenariosTable-<system-generated-random-Hash>.

  4. Select the item that corresponds to the Region in which you created the new task definition revision. For example, region-[replaceable]<region-name>`.

  5. In the item editor, locate the taskDefinition attribute and update its value with the complete task definition ARN you recorded in the previous section (including the version number).

  6. Choose Save changes.

Note

The updated task definition will only be used for new test runs. Any tests that are currently running or scheduled will continue to use the previous task definition.