From f5c60f68dc2e5ed116d91f271cc989876d6658f2 Mon Sep 17 00:00:00 2001
From: Jim Paris <jim@jtan.com>
Date: Thu, 29 Nov 2012 01:00:54 -0500
Subject: [PATCH] Speed tests.

test_interval_speed is about O(n * log n), which is good -- but the
constants are high and it hits swap on a 4G machine for the 2**21
test.  Hopefully cython helps!
---
 tests/test_interval.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tests/test_interval.py b/tests/test_interval.py
index b207330..c55d724 100644
--- a/tests/test_interval.py
+++ b/tests/test_interval.py
@@ -325,24 +325,29 @@ class TestIntervalTree:
         render(iset, "In-order insertion")
 
 class TestIntervalSpeed:
-    @unittest.skip("this is slow")
+    #@unittest.skip("this is slow")
     def test_interval_speed(self):
         import yappi
         import time
         import aplotter
         import random
+        import math
 
         print
         yappi.start()
         speeds = {}
-        for j in [ 2**x for x in range(5,18) ]:
+        for j in [ 2**x for x in range(5,21) ]:
             start = time.time()
             iset = IntervalSet()
             for i in random.sample(xrange(j),j):
                 interval = Interval(i, i+1)
                 iset += interval
             speed = (time.time() - start) * 1000000.0
-            printf("%d: %g μs (%g μs each)\n", j, speed, speed/j)
+            printf("%d: %g μs (%g μs each, O(n log n) ratio %g)\n",
+                   j,
+                   speed,
+                   speed/j,
+                   speed / (j*math.log(j))) # should be constant
             speeds[j] = speed
         aplotter.plot(speeds.keys(), speeds.values(), plot_slope=True)
         yappi.stop()