Re: emacs-27 b46c75b: xref-matches-in-files: Big Tramp speed-up

[Michael Albinus <michael.albinus@gmx.de>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> But allow me to state for the record once more that I'm puzzled by the
>>> architectural choice we're working with here.
>> I know that.  Tramp follows the generic file name handler approach, as
>> described in (info "(elisp) Magic File Names") .
>
> Could someone explain to me why `file-local-name` has to be so much slower
> than `tramp-file-local-name`?

Internally, `file-local-name' uses `file-remote-p'. The latter goes
through the file name handler machinery, and `tramp-file-name-handler'
eats time, according to Dmitry's measures. Usually not a problem, but
remarkable when you apply it to some ten thousand files as in
`xref-matches-in-files'.

>         Stefan

Best regards, Michael.