[Python-Dev] iterzip() (original) (raw)

Guido van Rossum guido@python.org
Mon, 29 Apr 2002 16:10:36 -0400

It acts about the same on Linux.

I don't see why it's a mystery. justtups() only uses one tuple at a time; it gets re-used from the free list every time. storetups() has to (py)malloc a new tuple every stinkin' time. Note that there's a net excess of allocations in the storetup() case, so we invoke the garbage collector every n/700 times through the loop. I've noted before that it doesn't make much sense to invoke GC unless there is at least one deallocation; you can't reclaim anything if there are no DECREFs.

But note the difference between 2.2 and 2.3 that I measured (repeatedly -- I don't know why Holger doesn't see this). Did the GC algorithm change between the two? Something must've changed.

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