fetch-pack: binary search when storing wanted-refs
authorJonathan Tan <jonathantanmy@google.com>
Wed, 27 Mar 2019 21:11:10 +0000 (14:11 -0700)
committerJunio C Hamano <gitster@pobox.com>
Mon, 1 Apr 2019 06:51:05 +0000 (15:51 +0900)
In do_fetch_pack_v2(), the "sought" array is sorted by name, and it is
not subsequently reordered (within the function). Therefore,
receive_wanted_refs() can assume that "sought" is sorted, and can thus
use a binary search when storing wanted-refs retrieved from the server.

Replace the existing linear search with a binary search. This improves
performance significantly when mirror cloning a repository with more
than 1 million refs.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fetch-pack.c

index 812be15..e018b1c 100644 (file)
@@ -1295,6 +1295,11 @@ static void receive_shallow_info(struct fetch_pack_args *args,
        }
 }
 
+static int cmp_name_ref(const void *name, const void *ref)
+{
+       return strcmp(name, (*(struct ref **)ref)->name);
+}
+
 static void receive_wanted_refs(struct packet_reader *reader,
                                struct ref **sought, int nr_sought)
 {
@@ -1302,20 +1307,16 @@ static void receive_wanted_refs(struct packet_reader *reader,
        while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
                struct object_id oid;
                const char *end;
-               int i;
+               struct ref **found;
 
                if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
                        die(_("expected wanted-ref, got '%s'"), reader->line);
 
-               for (i = 0; i < nr_sought; i++) {
-                       if (!strcmp(end, sought[i]->name)) {
-                               oidcpy(&sought[i]->old_oid, &oid);
-                               break;
-                       }
-               }
-
-               if (i == nr_sought)
+               found = bsearch(end, sought, nr_sought, sizeof(*sought),
+                               cmp_name_ref);
+               if (!found)
                        die(_("unexpected wanted-ref: '%s'"), reader->line);
+               oidcpy(&(*found)->old_oid, &oid);
        }
 
        if (reader->status != PACKET_READ_DELIM)