[issue12897] Support for iterators in multiprocessing map

[Richard Oudkerk]

Richard Oudkerk <shibturn at gmail.com> added the comment:

If you want lazy operation then you should use imap(f, it[, chunksize]) rather than using map_async(f, it).

This will return an iterator rather than a list.  Also, the iterator's next() method has a timeout argument.  (chunksize is the number of items which get sent to a worker in each batch, with 1 being the default.)

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nosy: +sbt

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<http://bugs.python.org/issue12897>
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