Running playwright tests with multiple workers

Question

I am looking to run playwright tests (Javascript) using multiple workers in a CI env (I use AWS Batch). My playwright.config.js file looks like this.

export default defineConfig({
  testDir: './playwright/tests',
  globalSetup: path.resolve(__dirname, './global-setup.js'),
  timeout: 120_000,    /* Maximum time one test can run for. */
  /* Run tests in files in parallel */
  fullyParallel: true,
  /* Fail the build on CI if you accidentally left test.only in the source code. */
  forbidOnly: !!process.env.CI,
  workers: process.env.CI ? 1 : undefined,

When I try to run the spec files from VSCode it automatically uses X number of workers based on number of spec files run at a time. For eg:

npx playwright test ./tests/BankAccountPage ./tests/TxnAndC* --headed --reporter=html
Running 78 tests using 2 workers

This automatically uses 2 workers and if I add more spec files to npx, it automatically increases worker nodes.

But when I deploy this to AWS batch, it doesn't seem to use multiple workers.

Is there any configuration I am missing here for running in AWS with multiple worker nodes?

Any help is much appreciated.

I was expecting playwright to use multiple workers when running in AWS but it seems to use only 1 worker. When running locally, I don't specify number of workers and PW automatically determines the number of workers to use.

Make sure your remote machine hardware has multiple cores. Related - github.com/microsoft/playwright/issues/26739 — vsync
– vsync, Commented Feb 9 at 12:43

Sajid · Accepted Answer · 2025-05-20 12:51:00Z

0

Set workers as undefined

workers:undefined,

This let Playwright auto-detect the number of cores and it will execute tests according to number of cores available

answered May 20 at 12:51

Sajid

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