@@ -17,6 +17,9 @@ skipping more commits at a time, reducing the number of round trips.
+
* `pack.useBitmapBoundaryTraversal=true` may improve bitmap traversal times by
walking fewer objects.
++
+* `pack.allowPackReuse=multi` may improve the time it takes to create a pack by
+reusing objects from multiple packs instead of just one.
feature.manyFiles::
Enable config options that optimize for repos with many files in the
@@ -4396,6 +4396,8 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
prepare_repo_settings(the_repository);
if (sparse < 0)
sparse = the_repository->settings.pack_use_sparse;
+ if (the_repository->settings.pack_use_multi_pack_reuse)
+ allow_pack_reuse = MULTI_PACK_REUSE;
}
reset_pack_idx_option(&pack_idx_opts);
@@ -43,6 +43,7 @@ void prepare_repo_settings(struct repository *r)
if (experimental) {
r->settings.fetch_negotiation_algorithm = FETCH_NEGOTIATION_SKIPPING;
r->settings.pack_use_bitmap_boundary_traversal = 1;
+ r->settings.pack_use_multi_pack_reuse = 1;
}
if (manyfiles) {
r->settings.index_version = 4;
@@ -39,6 +39,7 @@ struct repo_settings {
int sparse_index;
int pack_read_reverse_index;
int pack_use_bitmap_boundary_traversal;
+ int pack_use_multi_pack_reuse;
/*
* Does this repository have core.useReplaceRefs=true (on by
@@ -58,6 +58,22 @@ test_expect_success 'preferred pack is reused for single-pack reuse' '
test_pack_objects_reused_all 3 1
'
+test_expect_success 'multi-pack reuse is disabled by default' '
+ test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'feature.experimental implies multi-pack reuse' '
+ test_config feature.experimental true &&
+
+ test_pack_objects_reused_all 6 2
+'
+
+test_expect_success 'multi-pack reuse can be disabled with feature.experimental' '
+ test_config feature.experimental true &&
+ test_config pack.allowPackReuse single &&
+
+ test_pack_objects_reused_all 3 1
+'
test_expect_success 'enable multi-pack reuse' '
git config pack.allowPackReuse multi
Now that multi-pack reuse is supported, enable it via the feature.experimental configuration in addition to the classic `pack.allowPackReuse`. This will allow more users to experiment with the new behavior who might not otherwise be aware of the existing `pack.allowPackReuse` configuration option. The enum with values NO_PACK_REUSE, SINGLE_PACK_REUSE, and MULTI_PACK_REUSE is defined statically in builtin/pack-objects.c's compilation unit. We could hoist that enum into a scope visible from the repository_settings struct, and then use that enum value in pack-objects. Instead, define a single int that indicates what pack-objects's default value should be to avoid additional unnecessary code movement. Though `feature.experimental` implies `pack.allowPackReuse=multi`, this can still be overridden by explicitly setting the latter configuration to either "single" or "false". Tests covering all of these cases are showin t5332. Signed-off-by: Taylor Blau <me@ttaylorr.com> --- Documentation/config/feature.txt | 3 +++ builtin/pack-objects.c | 2 ++ repo-settings.c | 1 + repository.h | 1 + t/t5332-multi-pack-reuse.sh | 16 ++++++++++++++++ 5 files changed, 23 insertions(+)