bug#12747: 23.4; diff-auto-refine-mode process only last hunk in diff (must ALL).

[Noam Postavsky]

On 12 July 2018 at 09:28, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

>> This reminds that magit users found binding write-region-inhibit-fsync
>> around smerge-refine-regions made a noticable performance difference.
>> So should we add something like this?
>
> Sounds good, yes (tho I'm surprised it'd make much of a difference,
> when your /tmp is on some kind of tmpfs).  If you can add a URL
> pointing to the discussion where they found the noticable performance
> difference, that'd be even better.

Hmm, actually there wasn't that much discussion about it, one person
reported it made a big difference:

https://github.com/magit/magit/pull/2834

There was previous discussion about smerge refinement being slow, but
nobody narrowed it down to fsync in particular, and the conclusion
there was just "call smerge-refine-subst less".

https://github.com/magit/magit/issues/1581