Include module for desktop build

libs/pyutil/time_comparisons.py

@@ -0,0 +1,44 @@
+from pyutil import benchutil
+
+import hashlib, random, os
+
+from decimal import Decimal
+D=Decimal
+
+p1 = 'a'*32
+p1a = 'a'*32
+p2 = 'a'*31+'b' # close, but no cigar
+p3 = 'b'*32 # different in the first byte
+
+def compare(n, f, a, b):
+    for i in xrange(n):
+        f(a, b)
+
+def eqeqcomp(a, b):
+    return a == b
+
+def hashcomp(a, b):
+    salt = os.urandom(32)
+    return hashlib.md5(salt+ a).digest() == hashlib.md5(salt+b).digest()
+
+N=10**4
+REPS=10**2
+
+print "all times are in nanoseconds per comparison (scientific notation)"
+print
+
+for comparator in [eqeqcomp, hashcomp]:
+    print "using comparator ", comparator
+
+    # for (a, b, desc) in [(p1, p1a, 'same'), (p1, p2, 'close'), (p1, p3, 'far')]:
+    trials = [(p1, p1a, 'same'), (p1, p2, 'close'), (p1, p3, 'far')]
+    random.shuffle(trials)
+    for (a, b, desc) in trials:
+        print "comparing two strings that are %s to each other" % (desc,)
+
+        def f(n):
+            compare(n, comparator, a, b)
+
+        benchutil.rep_bench(f, N, UNITS_PER_SECOND=10**9, MAXREPS=REPS)
+
+        print