Compile grammer regex too slow.

laixintao commented 5 years ago

DEBUG [grammar compile time] 0.6472580432891846
DEBUG [timer] Grammer created: 9.5367431640625e-07 from start.
 INFO iredis start, host=127.0.0.1, port=6379, db=0.
DEBUG Using selector: KqueueSelector
DEBUG [timer] First REPL: 0.04548501968383789 from start.
DEBUG REPL waiting for command...

Takes 0.64secnds to compile when startup, painful slow.

laixintao commented 5 years ago

Consider using pickcle to precompile

laixintao commented 5 years ago

Caching re.compile result may not be a good solution. It may cause potential bugs, and Python version not compatible.

Besides, the grammar compiler I can use actually not python's re, it's python-prompt-toolkit's compile function. ( https://github.com/laixintao/iredis/blob/59fe208da632f2c736ecd661c78a60ceb7923809/iredis/redis_grammar.py#L100 ) It needs to extract the token and combine with Pygments.

https://stackoverflow.com/questions/65266/caching-compiled-regex-objects-in-python

cc @laike9m

laixintao commented 5 years ago

 INFO ------ iRedis ------
DEBUG [timer] start on 1565882014.094655
 INFO iredis start, host=127.0.0.1, port=6379, db=0.
DEBUG Using selector: KqueueSelector
DEBUG [compile] start compile grammer...
DEBUG [timer 0] 0.04720092 -> REPL waiting for command...
DEBUG [compile] Compile finished! Cost: 1.7342908382415771
DEBUG [compile] Patch finished!

guyskk commented 4 years ago

Pickle just dump the regex text and recompile when load back, seems disappointing. https://stackoverflow.com/questions/4037339/is-there-a-way-to-really-pickle-compiled-regular-expressions-in-python

(1) It's possible(but has risk) to hack sre_compile.compile, I found line p = sre_parse.parse(p, flags) and code = _code(p, flags) are most time-consuming and the return value can be really-pickled.

(2) The prompt_toolkit prompt_toolkit.contrib.regular_languages.compiler.compile compile 7000+ regex(_CompiledGrammar._re_prefix_patterns), and it seems no way to reduce the quantity of regex.

(3) But if we check the implementation of _CompiledGrammar.match_prefix, it seems reasonable to merge all regex into one, werkzeug.routing.Rule.compile is an example.

Life is short, I choose wait 10 seconds... 😂

laixintao commented 4 years ago

Thanks! Very helpful, I will leave this issue open and keep trying to optimize it.

For method (1), I think even pickled compiled regex, loading can still be time cosuming, but I haven't tried. There cloud be more problems if I do this, I guess.

(2) (3) are excellent! I will check werkzeug and see what I can do.

For (2), I think, maybe I can compile only the command list (which just come const, should be very fast) when IRedis start. And when user input command, let's say, SET, then compile SET's grammar regex. With this, only need to compile a few regexes a time. User may experience a little delay with first time use a command.

For the record, there are some other ideas I have tried:

replace re with google's re2, it's faster but not that fast, save 1 second on compiling means nothing in this situation; (the problem wasn't regex is too large or too bad, the problem was there were too many of them)
Try to replace regex-based grammar with pygments. It might work but I give up, it needs lots of work to do and I need to replace most parts of what prompt_toolkit to for me.

laixintao commented 4 years ago

FYI, the reson why it's slow:

REDIS_COMMANDS = fr"""
(\s*  (?P<command_key>({t['command_key']}))            \s+ {KEY}                                      \s*)|
(\s*  (?P<command_type_conntype_x>({t['command_type_conntype_x']}))
    (\s+ {TYPE_CONST}  \s+ {CONNTYPE})?                                                               \s*)
"""

will compile to

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redis-server  5.0.6
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laixintao commented 4 years ago

@guyskk About 3), Jonath is working on this: https://github.com/prompt-toolkit/python-prompt-toolkit/pull/1047

laixintao / iredis

Compile grammer regex too slow. #47