Re: [PATCH] rev-list: preallocate object hash table in --all --objects

This feels weirdly specific, and like we should just be tuning our hash
table growth better. You show a 3.2% speedup here. I was able to get a
2.8% speedup just by doing this:

diff --git a/object.c b/object.c
index 20703f5..8e5e12c 100644
--- a/object.c
+++ b/object.c

@@ -91,7 +91,7 @@ static void grow_object_hash(void)
 static void grow_object_hash(void)
 {
 	int i;
-	int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
+	int new_hash_size = obj_hash_size < 32 ? 32 : 3 * obj_hash_size;
 	struct object **new_hash;
 
 	new_hash = xcalloc(new_hash_size, sizeof(struct object *));

It might be worth trying to figure out what the optimium growth rate is
first, which would help this use case and others. With less fragile
code.