Re: Very promising results with libpcre2

From: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Date: Apr 1, 2017, 08:55 UTC
Message-ID: <CACBZZX416M3YFDAACGAWCjJ4Xt0g78zpFF+iusMCarKb7SSfVw@mail.gmail.com>
In-Reply-To: <xmqqtw69vz9t.fsf@gitster.mtv.corp.google.com>

On Sat, Apr 1, 2017 at 12:48 AM, Junio C Hamano <gitster@pobox.com> wrote:

Show 16 quoted lines

> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
>> That enables the new JIT support in pcre v2:
>>
>>       s/iter    rx fixed   prx
>> rx      2.19    --  -33%  -44%
>> fixed   1.47   49%    --  -17%
>> prx     1.22   79%   20%    --
>
> The numbers with JIT does look "interesting".
>
> I couldn't quite tell if there are major incompatibilities in the
> regex language itself between two versions from their documentation,
> but assuming that there isn't (modulo bugfixes and enhancements) and
> assuming that we are going to use their standard matcher, it may be
> OK to just use the newer one without linking both.

There's no incompatibilities in the regex language itself (modulo bugs etc). So yeah, I'll prepare some patch to use v2.