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From Emilian Bold <emilian.b...@gmail.com>
Subject Re: Version control advice
Date Wed, 23 Nov 2016 19:10:23 GMT
Well, I dunno what black magic `gc --aggressive` does but the repository is
0.85GB now!

I also ran `git reflog expire` first but it didn't change the size at all.

One thing to keep in mind is that I used --force although I had 6 commits
with the warning "repository has at least one unnamed head". Which were
probably all close branch commits (hg commit --close-branch).

So I might have have data loss(!) since I believe I read hg-fast-export.sh
picks only one unnamed head as the migration winner. I wonder if the gc
command didn't just purge a lot of valid commits from such an unnamed head
and that's why the repository became so small.

Could somebody else try a test repository conversion and validate my
numbers?

git gc --aggressive --prune=now
Counting objects: 4085031, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2909203/2909203), done.
Writing objects: 100% (4085031/4085031), done.
Total 4085031 (delta 2150468), reused 1585934 (delta 0)
Checking connectivity: 4085031, done.



--emi

On Wed, Nov 23, 2016 at 7:59 PM, Paul Merlin <paulmerlin@apache.org> wrote:

> Hi Emilian,
>
> > I see hg-fast-export.sh finished at some point.
> >
> > As expected though, git does not have any of the disk space gains. The
> > converted git releases/ repository is 3.6GB.
>
> Just a thought.
> Did you try some git cleanups after the conversion?
>
> git reflog expire --expire=now --all
> git gc --aggressive --prune=now
>
> Cheers
>
>
> > In case these statistics mean something:
> >
> > git-fast-import statistics:
> > ---------------------------------------------------------------------
> > Alloc'd objects:    4090000
> > Total objects:      4085509 (  40220100 duplicates                  )
> >       blobs  :      1036365 (  28386238 duplicates     858087 deltas of
> > 969684 attempts)
> >       trees  :      2735935 (  11833862 duplicates    1370606 deltas of
> >  2613480 attempts)
> >       commits:       313209 (         0 duplicates          0 deltas of
> >      0 attempts)
> >       tags   :            0 (         0 duplicates          0 deltas of
> >      0 attempts)
> > Total branches:        1283 (       346 loads     )
> >       marks:        1048576 (    313209 unique    )
> >       atoms:         124011
> > Memory total:        218429 KiB
> >        pools:         26711 KiB
> >      objects:        191718 KiB
> > ---------------------------------------------------------------------
> > pack_report: getpagesize()            =       4096
> > pack_report: core.packedGitWindowSize = 1073741824
> > pack_report: core.packedGitLimit      = 8589934592
> > pack_report: pack_used_ctr            =   39000045
> > pack_report: pack_mmap_calls          =     733040
> > pack_report: pack_open_windows        =          4 /          7
> > pack_report: pack_mapped              = 4280730006 / 6950823920
> > ---------------------------------------------------------------------
> >
> >
> > --emi
> >
> > On Fri, Nov 18, 2016 at 1:32 PM, Emilian Bold <emilian.bold@gmail.com>
> > wrote:
> >
> >> A releases/ clone which on my system takes 3.8GB is reduced to 1.6GB
> with
> >> the generaldelta and aggressivemergedeltas flags (took about 14 hours).
> >>
> >> Pretty impressive!
> >>
> >> Converting to git with hg-fast-export.sh complains that "repository has
> at
> >> least one unnamed head" for about 6 revisions. With --force I'm able to
> >> start the conversion but it hasn't finished yet.
> >>
> >> The git conversion is about 35% done and already using 1.3GB.
> >>
> >> So... I assume it's going to need just like the original repository
> about
> >> 3.8GB.
> >>
> >> I wonder if git has similar space-saving tricks?
> >>
> >>
> >>
> >> --emi
> >>
> >> On Thu, Nov 17, 2016 at 8:46 AM, Emilian Bold <emilian.bold@gmail.com>
> >> wrote:
> >>
> >>> Forgot about this. I've just started the Mercurial repository
> conversion
> >>> which will take a few hours.
> >>>
> >>> Will report tomorrow or when it's done.
> >>>
> >>>
> >>> --emi
> >>>
> >>> On Wed, Nov 16, 2016 at 11:18 PM, cowwoc <cowwoc@bbs.darktech.org>
> wrote:
> >>>
> >>>> Hi Emilian,
> >>>>
> >>>> Any update on this?
> >>>>
> >>>> Thanks,
> >>>> Gili
> >>>>
> >>>>
> >>>> On 2016-11-11 01:33 (-0500), Emilian Bold <e...@gmail.com> wrote:
> >>>>> Thank you for following through with this after we talked on IRC.>
> >>>>>
> >>>>> I will check later the size reduction for the releases/ repo.>
> >
>

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