Re: [lmi] Incidental differences on first commit and push of 2019

[Greg Chicares]

On 2019-01-09 17:39, Vadim Zeitlin wrote:
[...]
>  Hello (and happy new year!),

Happy new year to you too!

>  And, just for comparison, I ran git-fsck in my local mirror and had ~100
> of dangling blobs and commits, which made me realize that I didn't run
> git-gc in it since a long time (or maybe even ever) and I did it to gain
> some disk space:
> 
>       [lmi(master)]% du -sh .git
>       125M    .git
>       [lmi(master)]% g gc --prune=now
>       Enumerating objects: 65581, done.
>       Counting objects: 100% (65581/65581), done.
>       Delta compression using up to 8 threads
>       Compressing objects: 100% (25866/25866), done.
>       Writing objects: 100% (65581/65581), done.
>       Total 65581 (delta 45405), reused 58752 (delta 39622)
>       [lmi(master)]% du -sh .git
>       23M     .git
> 
> You could do the same thing if you'd like, this should be totally safe
I've done so, just because this seems like a good time for routine
maintenance. Summarizing:

  yours  mine  scenario
   125M   33M  initial condition*
    23M   20M  after explicit 'git gc'
    ---   17M  after explicit 'git gc --aggressive'

* My initial figure comes just a day or two after the previously
  reported "Auto packing the repository" event.

Notably, 'git gc' doesn't result in exactly the same size for us both.

The '--aggressive' command took less than a minute (I didn't think to
measure exactly how long it took). I can't recall ever using '--aggressive'
before, but maybe I should do it at the beginning of each year:

https://git-scm.com/docs/git-gc
|  --aggressive ... The effects of this optimization are persistent, so this
| option only needs to be used occasionally; every few hundred changesets or so.

Full terminal capture:

/opt/lmi/src/lmi[0]$du -sh .git             
33M     .git
/opt/lmi/src/lmi[0]$git gc --prune=now
Enumerating objects: 58990, done.
Counting objects: 100% (58990/58990), done.
Delta compression using up to 32 threads
Compressing objects: 100% (17074/17074), done.
Writing objects: 100% (58990/58990), done.
Total 58990 (delta 42605), reused 58175 (delta 41825)

/opt/lmi/src/lmi[0]$du -sh .git       
20M     .git
/opt/lmi/src/lmi[0]$git gc --aggressive 
Enumerating objects: 58990, done.
Counting objects: 100% (58990/58990), done.
Delta compression using up to 32 threads
Compressing objects: 100% (58899/58899), done.
Writing objects: 100% (58990/58990), done.
Total 58990 (delta 43062), reused 15748 (delta 0)
/opt/lmi/src/lmi[0]$du -sh .git        
17M     .git