On 18-12-31 19:47, Antoine Pitrou wrote:
> The complaint is that the global cache is still too costly.
> See measurements in https://bugs.python.org/issue35559
In this issue, using a global variable `_has_non_base16_digits` [1] will
accelerate 30%.
Is re module's internal cache [2] so bad?
If rewrite re module's cache with C and use a custom data structure,
maybe we will get a small speedup.
[1] `_has_non_base16_digits` in PR11287
[1] https://github.com/python/cpython/pull/11287/files
[2] re module's internal cache code:
[2] https://github.com/python/cpython/blob/master/Lib/re.py#L268-L295
_cache = {} # ordered!
_MAXCACHE = 512
def _compile(pattern, flags):
# internal: compile pattern
if isinstance(flags, RegexFlag):
flags = flags.value
try:
return _cache[type(pattern), pattern, flags]
except KeyError:
pass
...
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