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Re: [PATCH 18/19] index-helper: autorun

From
Duy Nguyen <pclouds@gmail.com>
Date
Mar 18, 2016, 07:44 UTC
Message-ID
<CACsJy8Amdr-2WqwYjYjyaag0jR_pq=h36QFKMk3BYQmE_A-DOw@mail.gmail.com>
In-Reply-To
<alpine.DEB.2.20.1603180752540.4690@virtualbox>

On Fri, Mar 18, 2016 at 2:14 PM, Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:

Show 25 quoted lines
> Hi Duy,
>
> On Fri, 18 Mar 2016, Duy Nguyen wrote:
>
>> On Thu, Mar 17, 2016 at 9:43 PM, Johannes Schindelin
>> <Johannes.Schindelin@gmx.de> wrote:
>>
>> > I know of use cases where the index weighs 300MB, and falling back to
>> > reading it directly *really* hurts.
>>
>> For crying out loud, what do you store in that repo? What I have in
>> mind for all these works are indexes in 10MB range, or maybe 50MB max.
>
> Welcome to the real world.
>
>> Very unscientifically, git.git index is about 274kb and contains ~3000
>> entries, so 94 bytes per entry on average.
>
> In terms of software projects' size, git.git is but a toy. Most developers
> deal with vastly larger (and often messier) repositories. This is
> especially true outside Open Source. Even the Linux kernel's repository is
> *tiny* compared to real-world repositories.
>
> I am sure that David could tell many a tale about repository/working
> directory size, too.

I know a few real-world repos, decades old, but I don't remember if any of them reached this size. Did I get that 3 million entry number right? Because even my whole /home uses over 1m inodes. And whole /usr only has 300k files. If the number of entries is lower, maybe there's some improvement we can do to reduce index size a bit. There's some fast compression we can do, for starter.

> So yeah, this is the challenge: to make Git work at real-world scale
> (didn't we hear a lot about this at the latest Git Merge?)

I'm all for making Junio cry by using Git for what it is (or was) not intended for, but this seems too much. A repo about 500k files or less, I think I can deal with, not those in million range.

-- 
Duy
Previous: Johannes SchindelinNext: David Turner
Message 48 of 60 in “index-helper, watchman”
  1. 00/19 index-helper, watchmanDavid Turner, Mar 9, 2016
  2. 01/19 trace.c: add GIT_TRACE_PACK_STATS for pack usage statisticsDavid Turner, Mar 9, 2016
  3. Junio C HamanoMar 9, 2016
  4. David TurnerMar 10, 2016
  5. Duy NguyenMar 10, 2016
  6. 02/19 read-cache.c: fix constness of verify_hdr()David Turner, Mar 9, 2016
  7. 03/19 read-cache: allow to keep mmap'd memory after readingDavid Turner, Mar 9, 2016
  8. Junio C HamanoMar 9, 2016
  9. David TurnerMar 10, 2016
  10. 04/19 index-helper: new daemon for caching index and related stuffDavid Turner, Mar 9, 2016
  11. Junio C HamanoMar 9, 2016
  12. Junio C HamanoMar 9, 2016
  13. David TurnerMar 10, 2016
  14. Duy NguyenMar 10, 2016
  15. David TurnerMar 10, 2016
  16. Duy NguyenMar 11, 2016
  17. David TurnerMar 10, 2016
  18. Duy NguyenMar 15, 2016
  19. Junio C HamanoMar 15, 2016
  20. Duy NguyenMar 15, 2016
  21. 05/19 trace.c: add GIT_TRACE_INDEX_STATS for index statisticsDavid Turner, Mar 9, 2016
  22. 06/19 index-helper: add --strictDavid Turner, Mar 9, 2016
  23. 07/19 daemonize(): set a flag before exiting the main processDavid Turner, Mar 9, 2016
  24. 08/19 index-helper: add --detachDavid Turner, Mar 9, 2016
  25. 09/19 index-helper: add Windows supportDavid Turner, Mar 9, 2016
  26. Duy NguyenMar 16, 2016
  27. Johannes SchindelinMar 17, 2016
  28. Duy NguyenMar 17, 2016
  29. 10/19 read-cache: add watchman 'WAMA' extensionDavid Turner, Mar 9, 2016
  30. 11/19 Add watchman support to reduce index refresh costDavid Turner, Mar 9, 2016
  31. 12/19 read-cache: allow index-helper to prepare shm before git reads itDavid Turner, Mar 9, 2016
  32. 13/19 index-helper: use watchman to avoid refreshing index with lstat()David Turner, Mar 9, 2016
  33. 14/19 update-index: enable/disable watchman supportDavid Turner, Mar 9, 2016
  34. 15/19 unpack-trees: preserve index extensionsDavid Turner, Mar 9, 2016
  35. 16/19 index-helper: rewrite pidfile after daemonizingDavid Turner, Mar 9, 2016
  36. 17/19 index-helper: process managementDavid Turner, Mar 9, 2016
  37. 18/19 index-helper: autorunDavid Turner, Mar 9, 2016
  38. Duy NguyenMar 15, 2016
  39. Johannes SchindelinMar 15, 2016
  40. Duy NguyenMar 16, 2016
  41. David TurnerMar 16, 2016
  42. Johannes SchindelinMar 16, 2016
  43. Duy NguyenMar 17, 2016
  44. Johannes SchindelinMar 17, 2016
  45. David TurnerMar 17, 2016
  46. Duy NguyenMar 18, 2016
  47. Johannes SchindelinMar 18, 2016
  48. Duy NguyenMar 18, 2016
  49. David TurnerMar 18, 2016
  50. Duy NguyenMar 18, 2016
  51. Johannes SchindelinMar 18, 2016
  52. Duy NguyenMar 18, 2016
  53. Johannes SchindelinMar 18, 2016
  54. 19/19 hack: watchman/untracked cache mashupDavid Turner, Mar 9, 2016
  55. Duy NguyenMar 15, 2016
  56. David TurnerMar 17, 2016
  57. Duy NguyenMar 17, 2016
  58. David TurnerMar 17, 2016
  59. Torsten BögershausenMar 29, 2016
  60. David TurnerMar 29, 2016

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