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| author | Junio C Hamano <gitster@pobox.com> | 2023-06-22 16:29:05 -0700 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2023-06-22 16:29:05 -0700 |
| commit | f2ffc7418685f75e43e2919426276141fd62c656 (patch) | |
| tree | 44571a732337464a3a2a6ac20259d7923bd6ff8a /Documentation/config | |
| parent | 4dd046932835d14c449f04ee0f3885669cad60c5 (diff) | |
| parent | b0afdce5dab61f224fd66c13768facc36a7f8705 (diff) | |
| download | git-f2ffc7418685f75e43e2919426276141fd62c656.tar.gz | |
Merge branch 'tb/pack-bitmap-traversal-with-boundary'
The object traversal using reachability bitmap done by
"pack-object" has been tweaked to take advantage of the fact that
using "boundary" commits as representative of all the uninteresting
ones can save quite a lot of object enumeration.
* tb/pack-bitmap-traversal-with-boundary:
pack-bitmap.c: use commit boundary during bitmap traversal
pack-bitmap.c: extract `fill_in_bitmap()`
object: add object_array initializer helper function
Diffstat (limited to 'Documentation/config')
| -rw-r--r-- | Documentation/config/feature.txt | 3 | ||||
| -rw-r--r-- | Documentation/config/pack.txt | 17 |
2 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/config/feature.txt b/Documentation/config/feature.txt index 17b4d39f89..bf9546fca4 100644 --- a/Documentation/config/feature.txt +++ b/Documentation/config/feature.txt @@ -14,6 +14,9 @@ feature.experimental:: + * `fetch.negotiationAlgorithm=skipping` may improve fetch negotiation times by skipping more commits at a time, reducing the number of round trips. ++ +* `pack.useBitmapBoundaryTraversal=true` may improve bitmap traversal times by +walking fewer objects. feature.manyFiles:: Enable config options that optimize for repos with many files in the diff --git a/Documentation/config/pack.txt b/Documentation/config/pack.txt index d4c7c9d4e4..3748136d14 100644 --- a/Documentation/config/pack.txt +++ b/Documentation/config/pack.txt @@ -123,6 +123,23 @@ pack.useBitmaps:: true. You should not generally need to turn this off unless you are debugging pack bitmaps. +pack.useBitmapBoundaryTraversal:: + When true, Git will use an experimental algorithm for computing + reachability queries with bitmaps. Instead of building up + complete bitmaps for all of the negated tips and then OR-ing + them together, consider negated tips with existing bitmaps as + additive (i.e. OR-ing them into the result if they exist, + ignoring them otherwise), and build up a bitmap at the boundary + instead. ++ +When using this algorithm, Git may include too many objects as a result +of not opening up trees belonging to certain UNINTERESTING commits. This +inexactness matches the non-bitmap traversal algorithm. ++ +In many cases, this can provide a speed-up over the exact algorithm, +particularly when there is poor bitmap coverage of the negated side of +the query. + pack.useSparse:: When true, git will default to using the '--sparse' option in 'git pack-objects' when the '--revs' option is present. This |