lib/annoy.rb in annoy-rb-0.1.0 vs lib/annoy.rb in annoy-rb-0.2.0

@@ -66,12 +66,13 @@
     end
 
     # Build a forest of index trees. After building, no more items can be added.
     #
     # @param n_trees [Integer] The number of trees. More trees gives higher search precision.
+    # @param n_jobs [Integer] The number of threads used to build the trees. If -1 is given, uses all available CPU cores.
     # @return [Boolean]
-    def build(n_trees)
-      @index.build(n_trees)
+    def build(n_trees, n_jobs: -1)
+      @index.build(n_trees, n_jobs)
     end
 
     # Save the search index to disk. After saving, no more items can be added.
     #
     # @param filename [String] The filename of search index.