Hello, Promped by an off-list mail by Tomas, I went to investigate how big a Deferred object really is.
I tried doing >>> a = [Deferred() for _ in xrange(10**5) >>> b = [Deferred() for _ in xrange(10**5) and so on in an interactive Python session and observed the memory usage grow with about 20 MiB per list. This means that an empty Deferred occupies about 210 bytes in memory. Adding a callback right away: >>> a = [Deferred().addCallback(foo) for _ in xrange(10**5)] increases the size per Deferred to about 500 bytes. I'm not sure what I expected, but half a kilobyte for a Deferred is quite a lot. The Twisted folks are working on a C implementation of twisted.internet.defer, and that might help -- I don't know. The discussion is here: http://twistedmatrix.com/trac/ticket/2245 -- Martin Geisler
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