diff mercurial/pycompat.py @ 37064:434e520adb8c

annotate: do not construct attr.s object per line while computing history

Unfortunately, good abstraction has a cost. It's way slower to construct
an annotateline() object than creating a plain tuple or a list. This patch
changes the internal data structure from row-based to columnar, so the
decorate() function can be instant (i.e. no Python in hot loop.)

For code readability, the outermost tuple is switched to an attr.s object
instead.

  (original, row-based attr.s)
  $ hg annot mercurial/commands.py --time > /dev/null
  time: real 11.470 secs (user 11.400+0.000 sys 0.070+0.000)
  $ hg annot mercurial/commands.py --time --line-number > /dev/null
  time: real 39.590 secs (user 39.500+0.000 sys 0.080+0.000)

  (this patch, columnar)
  $ hg annot mercurial/commands.py --time > /dev/null
  time: real 11.780 secs (user 11.710+0.000 sys 0.070+0.000)
  $ hg annot mercurial/commands.py --time --line-number > /dev/null
  time: real 12.240 secs (user 12.170+0.000 sys 0.090+0.000)

  (cf. 4.3.3, row-based tuple)
  $ hg annot mercurial/commands.py --time --line-number > /dev/null
  time: real 19.540 secs (user 19.460+0.000 sys 0.080+0.000)

--- a/mercurial/pycompat.py	Thu Mar 15 18:05:49 2018 -0700
+++ b/mercurial/pycompat.py	Mon Mar 12 20:45:10 2018 +0900
@@ -71,6 +71,9 @@
     def maplist(*args):
         return list(map(*args))
 
+    def rangelist(*args):
+        return list(range(*args))
+
     def ziplist(*args):
         return list(zip(*args))
 
@@ -348,6 +351,7 @@
     bytesio = cStringIO.StringIO
     stringio = bytesio
     maplist = map
+    rangelist = range
     ziplist = zip
     rawinput = raw_input
     getargspec = inspect.getargspec