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authorJunio C Hamano <junkio@cox.net>2006-02-15 17:34:29 -0800
committerJunio C Hamano <junkio@cox.net>2006-02-17 02:11:38 -0800
commita49dd05fd047f504a74fb053bb8ddbb9e4bd152b (patch)
treee850ef16ae77b243cad03615b98526dd39ab1b23 /pack.h
parent8cb711c8a5f98c1556b320114d7cc65e498ee2ae (diff)
downloadgit-a49dd05fd047f504a74fb053bb8ddbb9e4bd152b.tar.gz
pack-objects: reuse data from existing packs.
When generating a new pack, notice if we have already needed objects in existing packs. If an object is stored deltified, and its base object is also what we are going to pack, then reuse the existing deltified representation unconditionally, bypassing all the expensive find_deltas() and try_deltas() calls. Also, notice if what we are going to write out exactly match what is already in an existing pack (either deltified or just compressed). In such a case, we can just copy it instead of going through the usual uncompressing & recompressing cycle. Without this patch, in linux-2.6 repository with about 1500 loose objects and a single mega pack: $ git-rev-list --objects v2.6.16-rc3 >RL $ wc -l RL 184141 RL $ time git-pack-objects p <RL Generating pack... Done counting 184141 objects. Packing 184141 objects.................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 real 12m4.323s user 11m2.560s sys 0m55.950s With this patch, the same input: $ time ../git.junio/git-pack-objects q <RL Generating pack... Done counting 184141 objects. Packing 184141 objects..................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 Total 184141, written 184141, reused 182441 real 1m2.608s user 0m55.090s sys 0m1.830s Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'pack.h')
-rw-r--r--pack.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/pack.h b/pack.h
index 9dafa2b6d2..694e0c56f0 100644
--- a/pack.h
+++ b/pack.h
@@ -29,5 +29,7 @@ struct pack_header {
};
extern int verify_pack(struct packed_git *, int);
-
+extern int check_reuse_pack_delta(struct packed_git *, unsigned long,
+ unsigned char *, unsigned long *,
+ enum object_type *);
#endif