Re: Re* using tree as attribute source is slow, was Re: Help troubleshoot performance regression cloning with depth: git 2.44 vs git 2.42

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On Fri, May 03, 2024 at 01:46:53PM -0400, Jeff King wrote:
> On Fri, May 03, 2024 at 08:34:27AM -0700, Junio C Hamano wrote:
>
> > And for folks who had been happy with the pre 2.42 behaviour,
> > we could do something like the attached as the first step to a real fix.
>
> It looks like lots of discussion happened with out me, and everybody
> already posted all of the responses I was going to. Good. :)
>
> In particular...
>
> > ----- >8 --------- >8 --------- >8 --------- >8 -----
> > Subject: [PATCH] stop using HEAD for attributes in bare repository by default
> > [...]
> > The right fix for this is to optimize the code paths that allow
> > accesses to attributes in tree objects, but that is a much more
> > involved change and is left as a longer-term project, outside the
> > scope of this "first step" fix.
>
> ...this was the exact first step I was going to suggest. And your patch
> looks correct to me. I assume you'd target this for 'maint'. The
> regression goes back to v2.43.0, so it's not exactly new, but given the
> severity in some cases it seems like it's worth getting it into a
> release sooner rather than later.

For what it's worth, I am in favor of the patch that Junio proposed
here.

Thanks,
Taylor




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