# Source: https://vitest.dev/config/fileparallelism.md

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url: /config/fileparallelism.md
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# fileParallelism

* **Type:** `boolean`
* **Default:** `true`
* **CLI:** `--no-file-parallelism`, `--fileParallelism=false`

Should all test files run in parallel. Setting this to `false` will override `maxWorkers` option to `1`.

::: tip
This option doesn't affect tests running in the same file. If you want to run those in parallel, use `concurrent` option on [describe](/api/#describe-concurrent) or via [a config](#sequence-concurrent).
:::