[Python-Dev] Python startup time: String objects (original) (raw)

Guido van Rossum guido at python.org
Thu Mar 25 08:48:56 EST 2004

> But is this really where the time goes? On my home box (~11K > pystones/second) I can allocate 12K strings in 17 msec.

I have now implemented this change, and it gives 2% speed-up for an empty source file. The change is at http://python.org/sf/923098. > It seems that marshalling would have to become a two-pass thing, > unless you want to limit that dict/list to function scope, in which > case I'm not sure it'll make much of a difference. It's actually simpler than that. Marshalling recursively marshals code objects that have already been created, and traverses them all. So a single dict/list is sufficient. The change is 60 lines in marshal.c

Ah, I misunderstood. The dict/list isn't marshalled separartely; it is built up during (un)marshalling. Clever. (Pickling does a similar thing.)

--Guido van Rossum (home page: http://www.python.org/~guido/)

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