why python cache the string > 256?

s7v7nislands s7v7nislands at gmail.com
Mon Oct 26 10:44:09 CET 2009

hi all:

a = []
for i in xrange(1000000):

$python -i test.py     #virt mem 514m in top output
>>del a                   #virt mem 510m

why python cache these string?
In source, I see when object size > SMALL_REQUEST_THRESHOLD, python
would use malloc.
also use free() when string refcount == 0.

do I miss somethong?


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