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epriestley ed86c42b26 Improve performance of repository discovery in repositories with >65K refs
Summary:
Ref T13593. The commit cache in this Engine has a maximum fixed size (currently 65,535 entries).

If we execute discovery in a repository with more refs than this (e.g., 180K), we get fast lookups for the first 65,535 refs and slow lookups for the remaining refs.

Instead, divide the refs into chunks no larger than the cache size, and perform an explicit cache fill before each chunk is processed.

Test Plan:
  - Created a repository with 1K refs. Set cache size to 256. Ran discovery.
    - Before patch: saw one large cache fill and then ~750 single-gets.
    - After patch: saw four large cache fills.
  - Compared `bin/repository discover ... --verbose` output before and after patch for overall effect; saw no differences.

Maniphest Tasks: T13593

Differential Revision: https://secure.phabricator.com/D21521
2021-01-26 12:27:02 -08:00
bin Remove the "ssh-auth-key" script 2019-10-28 17:52:37 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Update SES API to use AWSv4 signatures 2020-09-15 13:03:49 -07:00
resources Set an explicit height when drawing the dependent revision graph 2020-10-16 14:10:36 -07:00
scripts Improve the quality of SSH error messages 2020-06-16 08:59:36 -07:00
src Improve performance of repository discovery in repositories with >65K refs 2021-01-26 12:27:02 -08:00
support Fix reading of the request path when running the PHP builtin webserver 2021-01-11 10:54:40 -08:00
webroot Set an explicit height when drawing the dependent revision graph 2020-10-16 14:10:36 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Continue moving classes with no callers in libphutil or Arcanist to Phabricator 2020-02-12 13:14:04 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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