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Re: [RFC PATCH 00/21] [RFC] Parallel checkout

From
JHJeff Hostetler <git@jeffhostetler.com>
Date
Aug 12, 2020, 16:57 UTC
Message-ID
<a927c55a-3e5a-b5f9-04d2-3d5e1d298b7a@jeffhostetler.com>
In-Reply-To
<cover.1597093021.git.matheus.bernardino@usp.br>
On 8/10/20 5:33 PM, Matheus Tavares wrote:
Show 15 quoted lines
> This series adds parallel workers to the checkout machinery. The cache
> entries are distributed among helper processes which are responsible for
> reading, filtering and writing the blobs to the working tree. This
> should benefit all commands that call unpack_trees() or check_updates(),
> such as: checkout, clone, sparse-checkout, checkout-index, etc.
> 
> This proposal is based on two previous ones, by Duy [1] and Jeff [2]. It
> uses some of the patches from these two series, with additional changes.
> The final parallel version was benchmarked during three operations with
> cold cache in the linux repo: cloning v5.8, checking out v5.8 from
> v2.6.15 and checking out v5.8 from v5.7. The three tables below show the
> mean run times and standard deviations for 5 runs in: a local file
> system, a Linux NFS server and Amazon EFS. The number of workers was
> chosen based on what produces the best result for each case.
> 
 > ...
> 
> The first 4 patches come from [2]. I couldn't get in touch with Jeff yet
> and ask for his approval on then, so I didn't include his Signed-off-by,
> for the time being.

This looks like an interesting mixture of our efforts. Thanks for picking it up. I got re-tasked earlier this summer and had to put it on hold. I've given it a quick read and like the overall shape. I still need to give it an in-depth review and run some perf tests on Windows and on the gigantic Windows and Office repos.

Please feel free to add my sign-off to those commits.
 > ...
Jeff
Previous: Matheus TavaresNext: Matheus Tavares
Message 26 of 61 in “[RFC] Parallel checkout”
  1. 00/21 [RFC] Parallel checkoutMatheus Tavares, Aug 10, 2020
  2. 01/21 convert: make convert_attrs() and convert structs publicMatheus Tavares, Aug 10, 2020
  3. 02/21 convert: add [async_]convert_to_working_tree_ca() variantsMatheus Tavares, Aug 10, 2020
  4. 03/21 convert: add get_stream_filter_ca() variantMatheus Tavares, Aug 10, 2020
  5. 04/21 convert: add conv_attrs classificationMatheus Tavares, Aug 10, 2020
  6. 05/21 entry: extract a header file for entry.c functionsMatheus Tavares, Aug 10, 2020
  7. 06/21 entry: make fstat_output() and read_blob_entry() publicMatheus Tavares, Aug 10, 2020
  8. 07/21 entry: extract cache_entry update from write_entry()Matheus Tavares, Aug 10, 2020
  9. 08/21 entry: move conv_attrs lookup up to checkout_entry()Matheus Tavares, Aug 10, 2020
  10. 09/21 entry: add checkout_entry_ca() which takes preloaded conv_attrsMatheus Tavares, Aug 10, 2020
  11. 10/21 unpack-trees: add basic support for parallel checkoutMatheus Tavares, Aug 10, 2020
  12. 11/21 parallel-checkout: make it truly parallelMatheus Tavares, Aug 10, 2020
  13. Jeff HostetlerAug 19, 2020
  14. Matheus Tavares BernardinoAug 20, 2020
  15. Jeff HostetlerAug 20, 2020
  16. 12/21 parallel-checkout: add configuration optionsMatheus Tavares, Aug 10, 2020
  17. 13/21 parallel-checkout: support progress displayingMatheus Tavares, Aug 10, 2020
  18. 14/21 make_transient_cache_entry(): optionally alloc from mem_poolMatheus Tavares, Aug 10, 2020
  19. 15/21 builtin/checkout.c: complete parallel checkout supportMatheus Tavares, Aug 10, 2020
  20. 16/21 checkout-index: add parallel checkout supportMatheus Tavares, Aug 10, 2020
  21. 17/21 parallel-checkout: avoid stat() calls in workersMatheus Tavares, Aug 10, 2020
  22. 18/21 entry: use is_dir_sep() when checking leading dirsMatheus Tavares, Aug 10, 2020
  23. 19/21 symlinks: make has_dirs_only_path() track FL_NOENTMatheus Tavares, Aug 10, 2020
  24. 20/21 parallel-checkout: create leading dirs in workersMatheus Tavares, Aug 10, 2020
  25. 21/21 parallel-checkout: skip checking the working tree on cloneMatheus Tavares, Aug 10, 2020
  26. Jeff HostetlerAug 12, 2020
  27. 00/19 Parallel Checkout (part I)Matheus Tavares, Sep 22, 2020
  28. 01/19 convert: make convert_attrs() and convert structs publicMatheus Tavares, Sep 22, 2020
  29. 03/19 convert: add get_stream_filter_ca() variantMatheus Tavares, Sep 22, 2020
  30. 02/19 convert: add [async_]convert_to_working_tree_ca() variantsMatheus Tavares, Sep 22, 2020
  31. 04/19 convert: add conv_attrs classificationMatheus Tavares, Sep 22, 2020
  32. 05/19 entry: extract a header file for entry.c functionsMatheus Tavares, Sep 22, 2020
  33. 06/19 entry: make fstat_output() and read_blob_entry() publicMatheus Tavares, Sep 22, 2020
  34. 07/19 entry: extract cache_entry update from write_entry()Matheus Tavares, Sep 22, 2020
  35. 08/19 entry: move conv_attrs lookup up to checkout_entry()Matheus Tavares, Sep 22, 2020
  36. Jeff HostetlerOct 1, 2020
  37. Jeff HostetlerOct 1, 2020
  38. 09/19 entry: add checkout_entry_ca() which takes preloaded conv_attrsMatheus Tavares, Sep 22, 2020
  39. 10/19 unpack-trees: add basic support for parallel checkoutMatheus Tavares, Sep 22, 2020
  40. parallel-checkout: drop unused checkout state parameterJeff King, Oct 5, 2020
  41. Matheus Tavares BernardinoOct 5, 2020
  42. Jeff KingOct 5, 2020
  43. 11/19 parallel-checkout: make it truly parallelMatheus Tavares, Sep 22, 2020
  44. Martin ÅgrenSep 29, 2020
  45. Matheus Tavares BernardinoSep 30, 2020
  46. 12/19 parallel-checkout: support progress displayingMatheus Tavares, Sep 22, 2020
  47. 13/19 make_transient_cache_entry(): optionally alloc from mem_poolMatheus Tavares, Sep 22, 2020
  48. 14/19 builtin/checkout.c: complete parallel checkout supportMatheus Tavares, Sep 22, 2020
  49. 15/19 checkout-index: add parallel checkout supportMatheus Tavares, Sep 22, 2020
  50. 16/19 parallel-checkout: add tests for basic operationsMatheus Tavares, Sep 22, 2020
  51. Jonathan NiederOct 20, 2020
  52. Taylor BlauOct 20, 2020
  53. Matheus Tavares BernardinoOct 20, 2020
  54. Junio C HamanoOct 20, 2020
  55. Matheus Tavares BernardinoOct 20, 2020
  56. Jonathan NiederOct 20, 2020
  57. Junio C HamanoOct 20, 2020
  58. 17/19 parallel-checkout: add tests related to clone collisionsMatheus Tavares, Sep 22, 2020
  59. 18/19 parallel-checkout: add tests related to .gitattributesMatheus Tavares, Sep 22, 2020
  60. 19/19 ci: run test round with parallel-checkout enabledMatheus Tavares, Sep 22, 2020
  61. Jeff HostetlerOct 1, 2020

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