add basic branch display tests

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index b616994f4587b9a3d0133b7d6694020743ea0a4d..cb51916fe33a904b8ab11b7c43dfe3a84ec11705 100644 (file)
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -78,7 +78,7 @@ static int progress = 1;
 static int window = 10;
 static uint32_t pack_size_limit, pack_size_limit_cfg;
 static int depth = 50;
-static int delta_search_threads = 1;
+static int delta_search_threads;
 static int pack_to_stdout;
 static int num_preferred_base;
 static struct progress *progress_state;
@@ -1612,11 +1612,18 @@ static void ll_find_deltas(struct object_entry **list, unsigned list_size,
                find_deltas(list, &list_size, window, depth, processed);
                return;
        }
+       if (progress > pack_to_stdout)
+               fprintf(stderr, "Delta compression using %d threads.\n",
+                               delta_search_threads);
 
        /* Partition the work amongst work threads. */
        for (i = 0; i < delta_search_threads; i++) {
                unsigned sub_size = list_size / (delta_search_threads - i);
 
+               /* don't use too small segments or no deltas will be found */
+               if (sub_size < 2*window && i+1 < delta_search_threads)
+                       sub_size = 0;
+
                p[i].window = window;
                p[i].depth = depth;
                p[i].processed = processed;