diff mbox series

[2/2] fetch: skip computing output width when not printing anything

Message ID 5a3fd3232fd9e19e6f0054717a1f54c71bd8f272.1643364888.git.ps@pks.im (mailing list archive)
State Accepted
Commit b18aaaa5e931d79d057f68ac0d7c3dd0377e5f03
Headers show
Series None | expand

Commit Message

Patrick Steinhardt Jan. 28, 2022, 10:19 a.m. UTC
When updating references via git-fetch(1), then by default we report to
the user which references have been changed. This output is formatted in
a nice table such that the different columns are aligned. Because the
first column contains abbreviated object IDs we thus need to iterate
over all refs which have changed and compute the minimum length for
their respective abbreviated hashes. While this effort makes sense in
most cases, it is wasteful when the user passes the `--quiet` flag: we
don't print the summary, but still compute the length.

Skip computing the summary width when the user asked for us to be quiet.
This gives us a small speedup of nearly 10% when doing a dry-run
mirror-fetch in a repository with thousands of references being updated:

    Benchmark 1: git fetch --prune --dry-run +refs/*:refs/* (HEAD~)
      Time (mean ± σ):     34.048 s ±  0.233 s    [User: 30.739 s, System: 4.640 s]
      Range (min … max):   33.785 s … 34.296 s    5 runs

    Benchmark 2: git fetch --prune --dry-run +refs/*:refs/* (HEAD)
      Time (mean ± σ):     30.768 s ±  0.287 s    [User: 27.534 s, System: 4.565 s]
      Range (min … max):   30.432 s … 31.181 s    5 runs

    Summary
      'git fetch --prune --dry-run +refs/*:refs/* (HEAD)' ran
        1.11 ± 0.01 times faster than 'git fetch --prune --dry-run +refs/*:refs/* (HEAD~)'

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---

[Resend with correct In-Reply-To header.]

 builtin/fetch.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 5f06b21f8e..ebbde5d56d 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1093,12 +1093,15 @@  static int store_updated_refs(const char *raw_url, const char *remote_name,
 	struct ref *rm;
 	char *url;
 	int want_status;
-	int summary_width = transport_summary_width(ref_map);
+	int summary_width = 0;
 
 	rc = open_fetch_head(&fetch_head);
 	if (rc)
 		return -1;
 
+	if (verbosity >= 0)
+		summary_width = transport_summary_width(ref_map);
+
 	if (raw_url)
 		url = transport_anonymize_url(raw_url);
 	else
@@ -1344,7 +1347,6 @@  static int prune_refs(struct refspec *rs, struct ref *ref_map,
 	int url_len, i, result = 0;
 	struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
 	char *url;
-	int summary_width = transport_summary_width(stale_refs);
 	const char *dangling_msg = dry_run
 		? _("   (%s will become dangling)")
 		: _("   (%s has become dangling)");
@@ -1373,6 +1375,8 @@  static int prune_refs(struct refspec *rs, struct ref *ref_map,
 	}
 
 	if (verbosity >= 0) {
+		int summary_width = transport_summary_width(stale_refs);
+
 		for (ref = stale_refs; ref; ref = ref->next) {
 			struct strbuf sb = STRBUF_INIT;
 			if (!shown_url) {