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-rw-r--r--docs/internals/contributing/writing-code/unit-tests.txt13
1 files changed, 13 insertions, 0 deletions
diff --git a/docs/internals/contributing/writing-code/unit-tests.txt b/docs/internals/contributing/writing-code/unit-tests.txt
index 8a097bba8c..55e3a2d5c7 100644
--- a/docs/internals/contributing/writing-code/unit-tests.txt
+++ b/docs/internals/contributing/writing-code/unit-tests.txt
@@ -284,3 +284,16 @@ combine this with ``--verbosity=2``, all SQL queries will be output::
.. versionadded:: 1.8
The ``--reverse`` and ``--debug-sql`` options were added.
+
+By default tests are run in parallel with one process per core. You can adjust
+this behavior with the ``--parallel`` option::
+
+ $ ./runtests.py basic --parallel=1
+
+You can also use the ``DJANGO_TEST_PROCESSES`` environment variable for this
+purpose.
+
+.. versionadded:: 1.9
+
+ Support for running tests in parallel and the ``--parallel`` option were
+ added.