61 lines
2.2 KiB
Plaintext
61 lines
2.2 KiB
Plaintext
From: tismer at appliedbiometrics.com (Christian Tismer)
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Date: Sun, 25 Apr 1999 20:05:15 GMT
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Subject: Python too slow for real world
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References: <372068E6.16A4A90@icrf.icnet.uk>
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<3720A21B.9C62DDB9@icrf.icnet.uk>
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<3720C4DB.7FCF2AE@appliedbiometrics.com>
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<3720C6EE.33CA6494@appliedbiometrics.com>
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<y0jaevznhha.fsf@vier.idi.ntnu.no>
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<glmvhemn4zx.fsf@caffeine.mitre.org> <y0j7lr0obcs.fsf@vier.idi.ntnu.no>
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Message-ID: <3723757B.CF96D973@appliedbiometrics.com>
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Content-Length: 1723
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X-UID: 357
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"Magnus L. Hetland" wrote:
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>
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> Justin Sheehy <justin at linus.mitre.org> writes:
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>
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> > mlh at idt.ntnu.no (Magnus L. Hetland) writes:
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> >
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> > > (And... How about builtin regexes in P2?)
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> >
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> > Um, why? I don't see any need at all for them to move from
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> > module-status to core-language-status.
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> [...]
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> >
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> > In all seriousness, what reason do you have for making that
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> > suggestion? I am willing to believe that there might be a good reason
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> > to do so, but it certainly isn't immediately obvious.
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>
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> Now, that's really simple -- because re.py is slow. I thought maybe
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> some of the slowness might be improved by a c-implementation, that's
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> all. Not too important to me...
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Now, true for re.py, but if you just care about speed,
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you can abuse the underlying pcre module which is compiled.
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For simple cases where I just needed to match something,
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the "code" attribute of a compiled re object can be used
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instead of the re object.
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I admit this is a hack, but it gave me a speedup of factor 3
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for a simple matching case. pcre's speed seems to be
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in the same order of magnitude as regex was.
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In the long term, I think it makes sense to build the rest of
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re.py also into pcre. Then I still would not see any reason
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to embed its functionaliy into the language.
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ciao - chris
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--
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Christian Tismer :^) <mailto:tismer at appliedbiometrics.com>
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Applied Biometrics GmbH : Have a break! Take a ride on Python's
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Kaiserin-Augusta-Allee 101 : *Starship* http://starship.python.net
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10553 Berlin : PGP key -> http://wwwkeys.pgp.net
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PGP Fingerprint E182 71C7 1A9D 66E9 9D15 D3CC D4D7 93E2 1FAE F6DF
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we're tired of banana software - shipped green, ripens at home
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