Re: Feature request: External grep support

[Marcus Harnisch]

Very much appreciated. Thanks.

On Thu, Apr 30, 2020 at 1:00 PM Shigio YAMAGUCHI <address@hidden> wrote:

OK. I have added this plan to the TODO list.
[https://www.gnu.org/software/global/plans.html]
Thank you for the request!

Regards,
Shigio

2020年4月30日(木) 16:41 Marcus Harnisch <address@hidden>:
>
> Hi Shigio
>
> Yes, of course. Here is the sequence of commands (grepping for the fixed string “grep”). You may want to run a dummy command first to fill the file system cache.
> $ cd emacs-master
> $ gtags
> $ du -ch $(global -P) | tail -n 1
> 79M total
> $ time global -g grep > /dev/null
>
> real 0m0,261s
> user 0m0,257s
> sys 0m0,004s
> $ time grep -l grep $(global -P) >/dev/null
>
> real 0m0,064s
> user 0m0,048s
> sys 0m0,016s
> $ time rg -l grep $(global -P) >/dev/null
>
> real 0m0,027s
> user 0m0,036s
> sys 0m0,020s
>
> Regards,
> Marcus
>
> On Thu, Apr 30, 2020 at 6:28 AM Shigio YAMAGUCHI <address@hidden> wrote:
>>
>> Hi Marcus,
>> Could you please give me an example of the command line to understand the issue?
>> I'm not sure what you did.
>>
>> Thanks,
>> Shigio
>>
>> 2020年4月30日(木) 6:12 Marcus Harnisch <address@hidden>:
>> >
>> > Hi Shigio
>> >
>> > Until now I hadn't noticed that global has its own grep implementation.
>> > It turns out that running ‘grep -l’ with a fixed string pattern on the list of files obtained with ‘global -P’ consumes about a quarter of the time of the corresponding ‘global -g’ command in a non-trivial code base (emacs-master, total size of files searched amounting to 79MB).
>> > Modern grep replacements, such as ripgrep (https://github.com/BurntSushi/ripgrep) are even faster than that. Exact numbers will obviously differ based on the actual pattern used.
>> > Perhaps grep() could be changed to off-loading to an external tool (possibly even configurable via gtags.conf)
>> >
>> > Thanks,
>> > Marcus
>>
>>
>>
>> --
>> Shigio YAMAGUCHI <address@hidden>
>> PGP fingerprint:
>> 26F6 31B4 3D62 4A92 7E6F  1C33 969C 3BE3 89DD A6EB



--
Shigio YAMAGUCHI <address@hidden>
PGP fingerprint:
26F6 31B4 3D62 4A92 7E6F  1C33 969C 3BE3 89DD A6EB