task-parallelization.md

Exercise: Task Parallelization

In this exercise we'll learn how to run tasks in parallel.

1. Run Task in parallel

In order to run tasks in parallel, we can just add the --parallel to the command, and it will run the tasks which can be parallelized in parallel.

Run the lint target for all projects in parallel

• with 1 parallel worker
• reset the cache
• with 5 parallel workers
• see the difference in time

Run lint target in parallel

npx nx run-many -t lint --parallel=1

nx reset 

npx nx run-many -t lint --parallel=5

2. Configure a default in nx.json

Configure the default parallelization in the nx.json file.

Configure default parallelization

{
  // ...,
  "parallel": 5
}

3. Run more tasks

Try to run:

• test
• build

Run more tasks

npx nx run-many -t test
npx nx run-many -t build

4. Make the ci run tasks in parallel

Let's update the ci pipeline to run tasks in parallel.

Warning

DON'T RAISE IT TOO HARD PLEASE (MAX 3)! GITHUB IS POOR! :-D

Make the ci run tasks in parallel

      - name: Run commands in parallel
        run: npx nx affected -t lint build --base=HEAD^ --parallel=3