[Python-Dev] [ python-Patches-876206 ] scary frame speed hacks (original) (raw)

Phillip J. Eby pje at telecommunity.com
Tue Mar 2 20:31:39 EST 2004

At 01:29 PM 3/3/04 +1300, Greg Ewing wrote:

Tim Peters <tim.one at comcast.net>:

> BTW, if a gazillion distinct functions run when starting up a large app, do > we hang on to the memory for their gazillion distinct frames forever? If you have a gazillion distinct functions in memory at once, you've got a gazillion code objects, plus associated function objects, arg name tuples, etc... Adding a stack frame to each of these probably won't make a huge difference, relatively speaking.

Frames are over three times larger than a function and a code object put together:

Python 2.2.2 (#37, Oct 14 2002, 17:02:34) [MSC 32 bit (Intel)] on win32 Type "copyright", "credits" or "license" for more information. IDLE 0.8 -- press F1 for help

import types types.FrameType.basicsize 336 types.FunctionType.basicsize 40 types.CodeType.basicsize 64

Of course, this doesn't include the bytecode length, but bytecode is quite compact.

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