At 15:23 12.06.2003 +0200, Samuele Pedroni wrote:
>I have played a bit with the notion of caching builtin and global values
>(to be precise the address of their dictionary entry) without changing
>language semantics:
>
>I have an experimental modification to the interpreteter such that I get
>these numbers: [bl_ is the baseline CVS code, ex_ is the modified interpreter]:
while obtaining a speedup when globals&built-ins are involved, as I said
the modification preserve the current semantics, here are transcripts
showing its working
Python 2.3b1+ (#100, Jun 12 2003, 22:25:31)
[GCC 2.96 20000731 (Red Hat Linux 7.1 2.96-98)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def g():
... y = 1
... print y
...
>>> g()
1
>>> # g doesn't need a cache
...
>>> def f():
... print x
... print x
...
>>> x=2
>>> f()
alloc cache
cache in code
caching
2
using cache
2
release my cache ref
>>> # the cache is allocated on demand, stored away in code, and populated
and used
...
>>> f()
fast load cache
using cache
2
using cache
2
release my cache ref
>>> # cache is retrieved from code and put to use
...
>>> del x
>>> x=3
>>> f()
alloc cache
cache in code
caching
3
using cache
3
release my cache ref
>>> # major change, cache discarded and rebuilt
...
>>> def h():
... print range
...
>>> h()
alloc cache
cache in code
caching
<built-in function range>
release my cache ref
>>> h()
fast load cache
using cache
<built-in function range>
release my cache ref
>>> range = "range"
>>> h()
alloc cache
cache in code
caching
range
release my cache ref
>>> del range
>>> h()
alloc cache
cache in code
caching
<built-in function range>
release my cache ref
>>> # shadowing/unshadowing of built-ins work
Python 2.3b1+ (#102, Jun 12 2003, 22:35:51)
[GCC 2.96 20000731 (Red Hat Linux 7.1 2.96-98)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> c = compile("def f(): print x\nf()","<>","exec")
>>> exec c in {'x': 1}
alloc cache
cache in code
caching
1
release my cache ref
>>> exec c in {'x': 2}
alloc cache
cache in code
caching
2
release my cache ref
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