# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1414922465 28800
# Node ID 46cec117dda24ba5b237491369519b193756eb08
# Parent  05aea77371a3abfd16e3951e75f06528b7e75072
maps.RevMap: disable GC while loading the revmap

The revmap load process creates lots of tiny objects.

With just the bare minimum Mercurial runtime, loading a million-file revmap
goes from 6.83 seconds to 6.28. For longer running processes (e.g. hg push a
series of changes) the difference will probably be dramatic.

diff --git a/hgsubversion/maps.py b/hgsubversion/maps.py
--- a/hgsubversion/maps.py
+++ b/hgsubversion/maps.py
@@ -220,6 +220,7 @@ class RevMap(dict):
             raise hgutil.Abort('revmap too new -- please upgrade')
         return f
 
+    @util.gcdisable
     def _load(self):
         for l in self.readmapfile(self.meta.revmap_file):
             revnum, ha, branch = l.split(' ', 2)