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Document how the daemon handles a changing set of source files #22243

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8 changes: 8 additions & 0 deletions docs/source/mypy_daemon.rst
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Expand Up @@ -45,6 +45,14 @@ will always run on the current host. Example::
``dmypy run`` will automatically restart the daemon if the
configuration or mypy version changes.

.. note::

The set of source files may change between runs. If you add a file
to the command line, the running daemon picks it up and type checks
it without a restart, so the cached state is preserved. To type
check different sets of files at the same time, run one daemon per
set, each with its own status file (see ``--status-file``).

The initial run will process all the code and may take a while to
finish, but subsequent runs will be quick, especially if you've only
changed a few files. (You can use :ref:`remote caching <remote-cache>`
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