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Re: [PATCH v4 03/16] index-helper: new daemon for caching index and related stuff

From
Duy Nguyen <pclouds@gmail.com>
Date
Apr 15, 2016, 11:25 UTC
Message-ID
<CACsJy8AyZKLC4Fsa8+BKqvRSAJOQSPBramjLC0ubrhW+fWQtxA@mail.gmail.com>
In-Reply-To
<1460573236.5540.83.camel@twopensource.com>
On Thu, Apr 14, 2016 at 1:47 AM, David Turner <dturner@twopensource.com> wrote:
Show 13 quoted lines
>> > +       fd = unix_stream_connect(socket_path);
>> > +       if (refresh_cache) {
>> > +               ret = write_in_full(fd, "refresh", 8) != 8;
>>
>> Since we've moved to unix socket and had bidirectional communication,
>> it's probably a good idea to read an "ok" back, giving index-helper
>> time to prepare the cache. As I recall the last discussion with
>> Johannes, missing a cache here when the index is around 300MB could
>> hurt more than wait patiently once and have it ready next time.
>
> It is somewhat slower to wait for the daemon (which requires a disk
> load + a memcpy) than it is to just load it ourselves (which is just a
> disk load).

You forgot the most costly part, SHA-1 verification. For very large index, I assume the index-helper is already in the middle of hashing the index content. If you ignore index-helper, you need to go hash the whole thing again. The index-helper can hand it to you if you wait just a bit more. This wait time should be shorter because index-helper is already in the middle of hashing (and in optimistic case, very close to finishing it).

-- 
Duy
Previous: David TurnerNext: David Turner
Message 9 of 39 in “index-helper, watchman”
  1. 00/16 index-helper, watchmanDavid Turner, Apr 13, 2016
  2. 01/16 read-cache.c: fix constness of verify_hdr()David Turner, Apr 13, 2016
  3. 02/16 read-cache: allow to keep mmap'd memory after readingDavid Turner, Apr 13, 2016
  4. 03/16 index-helper: new daemon for caching index and related stuffDavid Turner, Apr 13, 2016
  5. Duy NguyenApr 13, 2016
  6. David TurnerApr 13, 2016
  7. Duy NguyenApr 14, 2016
  8. David TurnerApr 15, 2016
  9. Duy NguyenApr 15, 2016
  10. David TurnerApr 15, 2016
  11. Duy NguyenApr 16, 2016
  12. Ramsay JonesApr 13, 2016
  13. David TurnerApr 13, 2016
  14. Junio C HamanoApr 14, 2016
  15. David TurnerApr 14, 2016
  16. Duy NguyenApr 15, 2016
  17. Stefan BellerApr 16, 2016
  18. David TurnerApr 19, 2016
  19. David TurnerApr 19, 2016
  20. 04/16 index-helper: add --strictDavid Turner, Apr 13, 2016
  21. 05/16 daemonize(): set a flag before exiting the main processDavid Turner, Apr 13, 2016
  22. 06/16 index-helper: add --detachDavid Turner, Apr 13, 2016
  23. 07/16 read-cache: add watchman 'WAMA' extensionDavid Turner, Apr 13, 2016
  24. 08/16 Add watchman support to reduce index refresh costDavid Turner, Apr 13, 2016
  25. Duy NguyenApr 17, 2016
  26. 09/16 index-helper: use watchman to avoid refreshing index with lstat()David Turner, Apr 13, 2016
  27. Stefan BellerApr 16, 2016
  28. David TurnerApr 19, 2016
  29. 10/16 update-index: enable/disable watchman supportDavid Turner, Apr 13, 2016
  30. 11/16 unpack-trees: preserve index extensionsDavid Turner, Apr 13, 2016
  31. 12/16 index-helper: kill modeDavid Turner, Apr 13, 2016
  32. Ævar Arnfjörð BjarmasonApr 16, 2016
  33. David TurnerApr 19, 2016
  34. 13/16 index-helper: don't run if already runningDavid Turner, Apr 13, 2016
  35. 14/16 index-helper: autorun modeDavid Turner, Apr 13, 2016
  36. 15/16 index-helper: optionally automatically runDavid Turner, Apr 13, 2016
  37. Duy NguyenApr 17, 2016
  38. David TurnerApr 19, 2016
  39. 16/16 read-cache: config for waiting for index-helperDavid Turner, Apr 13, 2016

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