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pack-objects: update size heuristucs.

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We used to omit delta base candidates that is much bigger than
the target, but delta size does not grow when we delete more, so
that was not a very good heuristics.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-04-27 19:31:46 -07:00
parent bd346f105d
commit 9a8b6a0a9d
1 changed files with 6 additions and 6 deletions
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12
pack-objects.c
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@ -1032,12 +1032,6 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
max_depth -= cur_entry->delta_limit;
}
size = cur_entry->size;
oldsize = old_entry->size;
sizediff = oldsize > size ? oldsize - size : size - oldsize;
if (size < 50)
return -1;
if (old_entry->depth >= max_depth)
return 0;
@ -1048,9 +1042,12 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
* more space-efficient (deletes don't have to say _what_ they
* delete).
*/
size = cur_entry->size;
max_size = size / 2 - 20;
if (cur_entry->delta)
max_size = cur_entry->delta_size-1;
oldsize = old_entry->size;
sizediff = oldsize < size ? size - oldsize : 0;
if (sizediff >= max_size)
return 0;
delta_buf = diff_delta(old->data, oldsize,
@ -1109,6 +1106,9 @@ static void find_deltas(struct object_entry **list, int window, int depth)
*/
continue;
if (entry->size < 50)
continue;
free(n->data);
n->entry = entry;
n->data = read_sha1_file(entry->sha1, type, &size);