How to find the number of allocated vcpus inside a Fargate task?

Question

We want to dynamically configure an application running on Fargate ECS to have one thread for each vcpu allocated to it.

The application parameter can be configured via an environment variable.

I'd like to fetch the number of vcpu's allocated from inside the task container and set the environment variable before starting the application.

Is there a way (e.g. a file under `/sys`, for instnace?) to fetch this when the task starts up?

HS · Accepted Answer

Hi, if you simply want to get the number of threads in a task, you can run the following command.

```log
root@ip-172-31-1-51:/usr/local/apache2# python3 -c 'import os; print(os.cpu_count())'
2
```

If you definitely want to get the number of vCPUs, you need to run `aws ecs describe-task-definition` command to fetch the vCPU info.

```log
root@ip-172-31-1-51:/usr/local/apache2# PAGER=cat aws ecs describe-task-definition --task-definition MyTaskDefinition --query "taskDefinition.cpu" --output text
256
```

How to find the number of allocated vcpus inside a Fargate task?

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