path: root/pack-objects.h
diff options
authorNguyễn Thái Ngọc Duy <>2018-04-15 15:36:17 (GMT)
committerJunio C Hamano <>2018-04-16 04:52:29 (GMT)
commit9806f5a7bf3d02247c2c500ef74f56213cd7b07a (patch)
treed81f3de59393e27d084d010e68c9f6f1b10fefa3 /pack-objects.h
parent8fc67762471c60ee644e6e100a3a85cf5a8631a0 (diff)
gc --auto: exclude base pack if not enough mem to "repack -ad"
pack-objects could be a big memory hog especially on large repos, everybody knows that. The suggestion to stick a .keep file on the giant base pack to avoid this problem is also known for a long time. Recent patches add an option to do just this, but it has to be either configured or activated manually. This patch lets `git gc --auto` activate this mode automatically when it thinks `repack -ad` will use a lot of memory and start affecting the system due to swapping or flushing OS cache. gc --auto decides to do this based on an estimation of pack-objects memory usage, which is quite accurate at least for the heap part, and whether that fits in half of system memory (the assumption here is for desktop environment where there are many other applications running). This mechanism only kicks in if gc.bigBasePackThreshold is not configured. If it is, it is assumed that the user already knows what they want. Signed-off-by: Nguyễn Thái Ngọc Duy <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'pack-objects.h')
1 files changed, 2 insertions, 0 deletions
diff --git a/pack-objects.h b/pack-objects.h
index 03f1191..af4f46c 100644
--- a/pack-objects.h
+++ b/pack-objects.h
@@ -1,6 +1,8 @@
+#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
struct object_entry {
struct pack_idx_entry idx;
unsigned long size; /* uncompressed size */