On 11/18/06, Petr Baudis <pasky@xxxxxxx> wrote:
On Sat, Nov 18, 2006 at 07:38:11PM CET, Junio C Hamano wrote:
> "Marco Costalba" <mcostalba@xxxxxxxxx> writes:
>
> > Time needed to execute git-peek-remote in my box with cold cache currently is:
> >
> > - git tree 2.347 ms
> > - linux tree 2.144 ms
> >
> > And refs are *already* packed in both repos.
> >
> > Looking at packed-refs file, it contains something like:
> >
> > d9b0f913ce0508fcc83e642e0241f373428368e5 refs/tags/v1.4.3
> > 4314f5982d2aac08001a977fc0b1b611e858e025 refs/tags/v1.4.3-rc1
> >
> > while I would need something like git-peek-remote output,
> >
> > d9b0f913ce0508fcc83e642e0241f373428368e5 refs/tags/v1.4.3
> > e0b0830726286287744cc9e1a629a534bbe75452 refs/tags/v1.4.3^{}
> > 4314f5982d2aac08001a977fc0b1b611e858e025 refs/tags/v1.4.3-rc1
> > 1965efb1599f59b8e3380335d1fa395e2008a30b refs/tags/v1.4.3-rc1^{}
> >
> > Because the sha value a tag points to is needed to match against
> > git-rev-list output so to identify tagged revisions.
> >
> > Would be possible to store in packed-refs also the dereferenced tag
> > info, so that cold opening of a repository would be much faster?
> >
> > Just to give an idea, with warmed up cache, refs reading times are:
> >
> > - git tree 43 ms
> > - linux tree 28 ms
> >
> > Thanks
> > Marco
> >
> > P.S: In case it's not clear I don't suggest to read directly the
> > packed-refs file with the added info, but always to use
> > git-peek-remote that _would_ became much faster.
>
> I think the question is why you would want to run peek-remote.
> Do you use the ^{} peeled-onion information and if so how and
> why?
My wild guess would be to attach tags to the right commits in qgit?
Yes. It is. From a list like
> > d9b0f913ce0508fcc83e642e0241f373428368e5 refs/tags/v1.4.3
> > e0b0830726286287744cc9e1a629a534bbe75452 refs/tags/v1.4.3^{}
> > 4314f5982d2aac08001a977fc0b1b611e858e025 refs/tags/v1.4.3-rc1
> > 1965efb1599f59b8e3380335d1fa395e2008a30b refs/tags/v1.4.3-rc1^{}
qgit (but also gitk FWIK) extracts
e0b0830726286287744cc9e1a629a534bbe75452
1965efb1599f59b8e3380335d1fa395e2008a30b
Stores in a quick look-up container and then checks against loaded
commits to, as Pasky says, attach the nice green markers to tags.
Marco
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