[PATCH 1/2] fast-import: count and report # of calls to diff_delta in stats
- From
Dmitry Ivankov <divanorama@gmail.com>
- Date
- Aug 20, 2011, 19:04 UTC
- Message-ID
- <1313867052-11993-2-git-send-email-divanorama@gmail.com>
- In-Reply-To
- <1313867052-11993-1-git-send-email-divanorama@gmail.com>
It's an interesting number, how often do we try to deltify each type of objects and how often do we succeed. So do add it to stats.
Success doesn't mean much gain in pack size though. As we allow delta to be as big as (data.len - 20). And delta close to data.len gains nothing compared to no delta at all even after zlib compression (delta is pretty much the same as data, just with few modifications).
We should try to make less attempts that result in huge deltas as these consume more cpu than trivial small deltas. Either by choosing a better delta base or reducing delta size upper bound or doing less delta attempts at all.
Currently, delta base for blobs is a waste literally. Each blob delta base is chosen as a previously stored blob. Disabling deltas for blobs doesn't increase pack size and reduce import time, or at least doesn't increase time for all fast-import streams I've tried.
Signed-off-by: Dmitry Ivankov <divanorama@gmail.com> --- fast-import.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/fast-import.c b/fast-import.c index 7cc2262..2b069e3 100644 --- a/fast-import.c +++ b/fast-import.c @@ -284,6 +284,7 @@ static uintmax_t marks_set_count; static uintmax_t object_count_by_type[1 << TYPE_BITS]; static uintmax_t duplicate_count_by_type[1 << TYPE_BITS]; static uintmax_t delta_count_by_type[1 << TYPE_BITS]; +static uintmax_t delta_count_attempts_by_type[1 << TYPE_BITS]; static unsigned long object_count; static unsigned long branch_count; static unsigned long branch_load_count; @@ -1045,6 +1046,7 @@ static int store_object( } if (last && last->data.buf && last->depth < max_depth && dat->len > 20) { + delta_count_attempts_by_type[type]++; delta = diff_delta(last->data.buf, last->data.len, dat->buf, dat->len, &deltalen, dat->len - 20); @@ -3338,10 +3340,10 @@ int main(int argc, const char **argv) fprintf(stderr, "---------------------------------------------------------------------\n"); fprintf(stderr, "Alloc'd objects: %10" PRIuMAX "\n", alloc_count); fprintf(stderr, "Total objects: %10" PRIuMAX " (%10" PRIuMAX " duplicates )\n", total_count, duplicate_count); - fprintf(stderr, " blobs : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas)\n", object_count_by_type[OBJ_BLOB], duplicate_count_by_type[OBJ_BLOB], delta_count_by_type[OBJ_BLOB]); - fprintf(stderr, " trees : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas)\n", object_count_by_type[OBJ_TREE], duplicate_count_by_type[OBJ_TREE], delta_count_by_type[OBJ_TREE]); - fprintf(stderr, " commits: %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas)\n", object_count_by_type[OBJ_COMMIT], duplicate_count_by_type[OBJ_COMMIT], delta_count_by_type[OBJ_COMMIT]); - fprintf(stderr, " tags : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas)\n", object_count_by_type[OBJ_TAG], duplicate_count_by_type[OBJ_TAG], delta_count_by_type[OBJ_TAG]); + fprintf(stderr, " blobs : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_BLOB], duplicate_count_by_type[OBJ_BLOB], delta_count_by_type[OBJ_BLOB], delta_count_attempts_by_type[OBJ_BLOB]); + fprintf(stderr, " trees : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TREE], duplicate_count_by_type[OBJ_TREE], delta_count_by_type[OBJ_TREE], delta_count_attempts_by_type[OBJ_TREE]); + fprintf(stderr, " commits: %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_COMMIT], duplicate_count_by_type[OBJ_COMMIT], delta_count_by_type[OBJ_COMMIT], delta_count_attempts_by_type[OBJ_COMMIT]); + fprintf(stderr, " tags : %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TAG], duplicate_count_by_type[OBJ_TAG], delta_count_by_type[OBJ_TAG], delta_count_attempts_by_type[OBJ_TAG]); fprintf(stderr, "Total branches: %10lu (%10lu loads )\n", branch_count, branch_load_count); fprintf(stderr, " marks: %10" PRIuMAX " (%10" PRIuMAX " unique )\n", (((uintmax_t)1) << marks->shift) * 1024, marks_set_count); fprintf(stderr, " atoms: %10u\n", atom_cnt);
-- 1.7.3.4