GitHub Actions allows for parallel job execution to enhance workflow efficiency. By employing the "parallel" keyword, multiple jobs run concurrently, reducing task completion times. The article explores the maximum number of parallel jobs,
GitHub Actions is a powerful tool for automating your software development workflow. One of the features that makes GitHub Actions so powerful is the ability to run parallel jobs. This can be a huge time-saver for tasks that can be broken down into smaller, independent steps.
To run parallel jobs in GitHub Actions, you need to use the parallel
keyword in your workflow file. The parallel
keyword takes a list of job names as its argument. For example, the following workflow file will run two jobs, job1
and job2
, in parallel:
<code class="yaml">name: My Workflow on: [push] jobs: job1: runs-on: ubuntu-latest steps: - echo "Hello from job1!" job2: runs-on: ubuntu-latest steps: - echo "Hello from job2!"</code>
When this workflow is run, both job1
and job2
will start running at the same time. Once both jobs have completed successfully, the workflow will complete.
The number of simultaneous parallel jobs that can be run in GitHub Actions depends on the type of runner that you are using. For self-hosted runners, the maximum number of parallel jobs that can be run is equal to the number of CPUs on the runner. For GitHub-hosted runners, the maximum number of parallel jobs that can be run is 20.
Yes, parallel jobs in GitHub Actions can share the same secrets. To share secrets between parallel jobs, you can use the secrets
context. The secrets
context is a dictionary that contains all of the secrets that are available to the workflow.
To access the secrets
context in a job, you can use the secrets
keyword. For example, the following job will print the value of the MY_SECRET
secret:
<code class="yaml">name: My Job on: [push] jobs: job1: runs-on: ubuntu-latest steps: - echo "The value of MY_SECRET is: ${{ secrets.MY_SECRET }}"</code>
There are a few different ways to debug parallel jobs in GitHub Actions. One way is to use the actions/runner-debug
action. This action will print a lot of useful information about the runner, including the environment variables that are available to jobs.
To use the actions/runner-debug
action, add the following to your workflow file:
<code class="yaml">name: My Workflow on: [push] jobs: job1: runs-on: ubuntu-latest steps: - uses: actions/runner-debug@v1</code>
Once you have added the actions/runner-debug
action to your workflow file, you can run the workflow and see the output in the GitHub Actions logs.
Another way to debug parallel jobs in GitHub Actions is to use the -vv
flag when running the github-actions
CLI. This flag will print a lot of additional information about the workflow, including the steps that are being executed and the resources that are being used.
To use the -vv
flag, run the following command:
<code>github-actions -vv run workflow.yaml</code>
The output of the -vv
flag can be helpful for troubleshooting issues with parallel jobs.
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