diff tests/test-ancestor.py @ 18091:f7f8159caad3

ancestor: add lazy membership testing to lazyancestors

This also makes the perfancestorset command use lazy membership testing. In a
linear repository with over 400,000 commits, without this patch, hg
perfancestorset takes 0.80 seconds no matter how far behind we're looking.
With this patch, hg perfancestorset -- X takes:

    Rev X       Time
       -1      0.00s
    -4000      0.01s
   -20000      0.04s
   -80000      0.17s
  -200000      0.43s
  -300000      0.69s
        0      0.88s

Thus, for revisions close to tip, we're up to several orders of magnitude
faster. At 0 we're around 10% slower.

--- a/tests/test-ancestor.py	Tue Dec 18 10:14:01 2012 -0800
+++ b/tests/test-ancestor.py	Tue Dec 18 12:47:20 2012 -0800
@@ -34,6 +34,9 @@
          13: [8]}
 pfunc = graph.get
 
+class mockchangelog(object):
+    parentrevs = graph.get
+
 def runmissingancestors(revs, bases):
     print "%% ancestors of %s and not of %s" % (revs, bases)
     print ancestor.missingancestors(revs, bases, pfunc)
@@ -70,5 +73,34 @@
     runmissingancestors([10, 11, 12], [13])
     runmissingancestors([13], [10, 11, 12])
 
+def genlazyancestors(revs, stoprev=0, inclusive=False):
+    print ("%% lazy ancestor set for %s, stoprev = %s, inclusive = %s" %
+           (revs, stoprev, inclusive))
+    return ancestor.lazyancestors(mockchangelog, revs, stoprev=stoprev,
+                                  inclusive=inclusive)
+
+def printlazyancestors(s, l):
+    print [n for n in l if n in s]
+
+def test_lazyancestors():
+    # Empty revs
+    s = genlazyancestors([])
+    printlazyancestors(s, [3, 0, -1])
+
+    # Standard example
+    s = genlazyancestors([11, 13])
+    printlazyancestors(s, [11, 13, 7, 9, 8, 3, 6, 4, 1, -1, 0])
+
+    # Including revs
+    s = genlazyancestors([11, 13], inclusive=True)
+    printlazyancestors(s, [11, 13, 7, 9, 8, 3, 6, 4, 1, -1, 0])
+
+    # Test with stoprev
+    s = genlazyancestors([11, 13], stoprev=6)
+    printlazyancestors(s, [11, 13, 7, 9, 8, 3, 6, 4, 1, -1, 0])
+    s = genlazyancestors([11, 13], stoprev=6, inclusive=True)
+    printlazyancestors(s, [11, 13, 7, 9, 8, 3, 6, 4, 1, -1, 0])
+
 if __name__ == '__main__':
     test_missingancestors()
+    test_lazyancestors()