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authorLibravatar Derrick Stolee <dstolee@microsoft.com>2020-12-30 04:31:53 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-01-04 15:18:22 -0800
commit90b666da601a5ccf9bbc3f2282fb166bf3fdade7 (patch)
tree39152afd9d9080c01e251f6c86545c0a2121e747
parentGit 2.30 (diff)
downloadtgif-90b666da601a5ccf9bbc3f2282fb166bf3fdade7.tar.xz
revision: trace topo-walk statistics
We trace statistics about the effectiveness of changed-path Bloom filters since 42e50e78 (revision.c: add trace2 stats around Bloom filter usage, 2020-04-06). Add similar tracing for the topo-walk algorithm that uses generation numbers to limit the walk size. This information can help investigate and describe benefits to heuristics and other changes. The information that is printed is in JSON format and can be formatted nicely to present as follows: { "count_explort_walked":2603, "count_indegree_walked":2603, "count_topo_walked":473 } Each of these values count the number of commits are visited by each of the three "stages" of the topo-walk as detailed in b4542418 (revision.c: generation-based topo-order algorithm, 2018-11-01). Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--revision.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/revision.c b/revision.c
index 9dff845bed..1bb590ece7 100644
--- a/revision.c
+++ b/revision.c
@@ -3308,6 +3308,26 @@ struct topo_walk_info {
struct author_date_slab author_date;
};
+static int topo_walk_atexit_registered;
+static unsigned int count_explore_walked;
+static unsigned int count_indegree_walked;
+static unsigned int count_topo_walked;
+
+static void trace2_topo_walk_statistics_atexit(void)
+{
+ struct json_writer jw = JSON_WRITER_INIT;
+
+ jw_object_begin(&jw, 0);
+ jw_object_intmax(&jw, "count_explore_walked", count_explore_walked);
+ jw_object_intmax(&jw, "count_indegree_walked", count_indegree_walked);
+ jw_object_intmax(&jw, "count_topo_walked", count_topo_walked);
+ jw_end(&jw);
+
+ trace2_data_json("topo_walk", the_repository, "statistics", &jw);
+
+ jw_release(&jw);
+}
+
static inline void test_flag_and_insert(struct prio_queue *q, struct commit *c, int flag)
{
if (c->object.flags & flag)
@@ -3329,6 +3349,8 @@ static void explore_walk_step(struct rev_info *revs)
if (repo_parse_commit_gently(revs->repo, c, 1) < 0)
return;
+ count_explore_walked++;
+
if (revs->sort_order == REV_SORT_BY_AUTHOR_DATE)
record_author_date(&info->author_date, c);
@@ -3367,6 +3389,8 @@ static void indegree_walk_step(struct rev_info *revs)
if (repo_parse_commit_gently(revs->repo, c, 1) < 0)
return;
+ count_indegree_walked++;
+
explore_to_depth(revs, commit_graph_generation(c));
for (p = c->parents; p; p = p->next) {
@@ -3476,6 +3500,11 @@ static void init_topo_walk(struct rev_info *revs)
*/
if (revs->sort_order == REV_SORT_IN_GRAPH_ORDER)
prio_queue_reverse(&info->topo_queue);
+
+ if (trace2_is_enabled() && !topo_walk_atexit_registered) {
+ atexit(trace2_topo_walk_statistics_atexit);
+ topo_walk_atexit_registered = 1;
+ }
}
static struct commit *next_topo_commit(struct rev_info *revs)
@@ -3502,6 +3531,8 @@ static void expand_topo_walk(struct rev_info *revs, struct commit *commit)
oid_to_hex(&commit->object.oid));
}
+ count_topo_walked++;
+
for (p = commit->parents; p; p = p->next) {
struct commit *parent = p->item;
int *pi;