diff -r beff0b2481b3 -r 5ba0a99ff27f contrib/perf.py
--- a/contrib/perf.py	Sat Oct 17 01:15:34 2015 +0900
+++ b/contrib/perf.py	Sat Oct 17 01:15:34 2015 +0900
@@ -222,7 +222,7 @@
     "a" in ds
     def d():
         ds._dirty = True
-        ds.write()
+        ds.write(repo.currenttransaction())
     timer(d)
     fm.end()