On Tue, 28 May 2019, I wrote:
> > ./pcre2test -tm
> > PCRE2 version 10.34-RC1 2019-04-22
> > re> /abcd/
> > data> \[012345678a]{2000}
> > Match time 0.1659 milliseconds
> > No match
> > data>
> > re> /abcd/jit
> > data> \[012345678a]{2000}
> > Match time 0.0027 milliseconds
> > No match
>
> Thanks for posting that example. I've just noticed that an improvement
> may be possible in the interpreter
Experiments show that the limit on searching for a "must have" code unit
were rather low, especially for unanchored searches. I have increased
the limit for unanchored matches substantially, giving a big improvement
for your example:
$ ./pcre2test -tm zz
PCRE2 version 10.34-RC1 2019-04-22
/abcd/
\[0123456789a]{2000}
Match time 0.0002 milliseconds The old value is 0.0477 on my box
No match
$ ./pcre2test -tm -jit zz
PCRE2 version 10.34-RC1 2019-04-22
/abcd/
\[0123456789a]{2000}
Match time 0.0185 milliseconds
No match
Even when memchr can't be used:
$ ./pcre2test -16 -tm zz
PCRE2 version 10.34-RC1 2019-04-22
/abcd/
\[0123456789a]{2000}
Match time 0.0067 milliseconds
No match
$ ./pcre2test -16 -jit -tm zz
PCRE2 version 10.34-RC1 2019-04-22
/abcd/
\[0123456789a]{2000}
Match time 0.0185 milliseconds
No match
However, it is certainly the case that one can fine-tune example to make
the figures better or worse.
Regards,
Philip
--
Philip Hazel
