Some comments...
On 4/9/2012 11:09 AM, antoine.pitrou wrote:
http://hg.python.org/cpython/rev/704630a9c5d5
changeset: 76179:704630a9c5d5
user: Antoine Pitrou<[email protected]>
date: Mon Apr 09 17:03:32 2012 +0200
summary:
Issue #13165: stringbench is now available in the Tools/stringbench folder.
...
diff --git a/Tools/stringbench/stringbench.py b/Tools/stringbench/stringbench.py
new file mode 100755
--- /dev/null
+++ b/Tools/stringbench/stringbench.py
@@ -0,0 +1,1483 @@
+
Did you mean to start with a blank line?
+# Various microbenchmarks comparing unicode and byte string performance
+# Please keep this file both 2.x and 3.x compatible!
Which versions of 2.x? In particular
+dups = {}
+ dups[f.__name__] = 1
Is the use of a dict for a set a holdover that could be updated, or
intentional for back compatibility with 2.whatever and before?
+# Try with regex
+@uses_re
+@bench('s="ABC"*33; re.compile(s+"D").search((s+"D")*300+s+"E")',
+ "late match, 100 characters", 100)
+def re_test_slow_match_100_characters(STR):
+ m = STR("ABC"*33)
+ d = STR("D")
+ e = STR("E")
+ s1 = (m+d)*300 + m+e
+ s2 = m+e
+ pat = re.compile(s2)
+ search = pat.search
+ for x in _RANGE_100:
+ search(s1)
If regex is added to stdlib as other than re replacement, we might want
option to use that instead or in addition to the current re.
+#### Benchmark join
+
+def get_bytes_yielding_seq(STR, arg):
+ if STR is BYTES and sys.version_info>= (3,):
+ raise UnsupportedType
+ return STR(arg)
+@bench('"A".join("")',
+ "join empty string, with 1 character sep", 100)
I am puzzled by this. Does str.join(iterable) internally branch on
whether the iterable is a str or not, so that that these timings might
be different from equivalent timings with list of strings?
What might be interesting, especially for 3.3, is timing with non-ascii
BMP and non-BMP chars both as joiner and joined.
tjr
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