| CTEST_PARALLEL_LEVEL |
| -------------------- |
| |
| .. include:: ENV_VAR.txt |
| |
| Specify the number of tests for CTest to run in parallel. |
| For example, if ``CTEST_PARALLEL_LEVEL`` is set to 8, CTest will run |
| up to 8 tests concurrently as if ``ctest`` were invoked with the |
| :option:`--parallel 8 <ctest --parallel>` option. |
| |
| .. versionchanged:: 3.29 |
| |
| The value may be empty, or ``0``, to let ctest use a default level of |
| parallelism, or unbounded parallelism, respectively, as documented by |
| the :option:`ctest --parallel` option. |
| |
| On Windows, environment variables cannot be set to an empty string. |
| CTest will interpret a whitespace-only string as empty. |
| |
| In CMake 3.28 and earlier, an empty or ``0`` value was equivalent to ``1``. |
| |
| See :manual:`ctest(1)` for more information on parallel test execution. |
