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Doc/library/multiprocessing.rst
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@ -2440,6 +2440,16 @@ with the :class:`Pool` class.
the process pool as separate tasks. The (approximate) size of these
chunks can be specified by setting *chunksize* to a positive integer.
It is important to distinguish between *maxtasksperchild* in the
:class:`Pool` class and *chunksize*. Whereas *maxtasksperchild* denotes
how many tasks can be run at once before those resources are freed,
*chunksize* defines how many separate chunks in which to split all of the
iterations of the function. In order for each iteration of the function to
be executed separately, *chunksize* needs to be set to 1.
Whereas :meth:`imap` defaults to a *chunksize* of 1, :meth:`map` defaults
to ``None`` and needs to be declared explicitly.
Note that it may cause high memory usage for very long iterables. Consider
using :meth:`imap` or :meth:`imap_unordered` with explicit *chunksize*
option for better efficiency.