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ctest: Allow passing -j without value to choose a contextual default

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Under job server integration, added by commit 80fe56c481 (ctest: Add
support for running under a make job server on POSIX systems,
2023-11-15, v3.29.0-rc1~324^2), use a very high default so that
parallelism is effectively limited only by available job server tokens.

Otherwise, choose a default limit based on the number of processors.

Also allow passing `0` to specify unbounded parallelism.

Fixes: #25739
This commit is contained in:
Brad King
2024-03-06 11:16:33 -05:00
parent bbcbcff7d9
commit 5de1e21659
40 changed files with 372 additions and 51 deletions
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13
Help/command/ctest_test.rst
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@@ -18,7 +18,7 @@ Perform the :ref:`CTest Test Step` as a :ref:`Dashboard Client`.
[EXCLUDE_FIXTURE <regex>]
[EXCLUDE_FIXTURE_SETUP <regex>]
[EXCLUDE_FIXTURE_CLEANUP <regex>]
[PARALLEL_LEVEL <level>]
[PARALLEL_LEVEL [<level>]]
[RESOURCE_SPEC_FILE <file>]
[TEST_LOAD <threshold>]
[SCHEDULE_RANDOM <ON|OFF>]
@@ -104,9 +104,14 @@ The options are:
Same as ``EXCLUDE_FIXTURE`` except only matching cleanup tests are excluded.
``PARALLEL_LEVEL <level>``
Specify a positive number representing the number of tests to
be run in parallel.
``PARALLEL_LEVEL [<level>]``
Run tests in parallel, limited to a given level of parallelism.
.. versionadded:: 3.29
The ``<level>`` may be omitted, or ``0``, to let ctest use a default
level of parallelism, or unbounded parallelism, respectively, as
documented by the :option:`ctest --parallel` option.
``RESOURCE_SPEC_FILE <file>``
.. versionadded:: 3.16