mirror of
https://github.com/python/cpython.git
synced 2024-12-12 03:04:15 +08:00
143 lines
3.5 KiB
Python
143 lines
3.5 KiB
Python
"""Sort performance test.
|
|
|
|
See main() for command line syntax.
|
|
See tabulate() for output format.
|
|
|
|
"""
|
|
|
|
import sys
|
|
import time
|
|
import whrandom
|
|
import marshal
|
|
import tempfile
|
|
import operator
|
|
import os
|
|
|
|
td = tempfile.gettempdir()
|
|
|
|
def randrange(n):
|
|
"""Return a random shuffle of range(n)."""
|
|
fn = os.path.join(td, "rr%06d" % n)
|
|
try:
|
|
fp = open(fn, "rb")
|
|
except IOError:
|
|
result = []
|
|
for i in range(n):
|
|
result.append(whrandom.random())
|
|
try:
|
|
try:
|
|
fp = open(fn, "wb")
|
|
marshal.dump(result, fp)
|
|
fp.close()
|
|
fp = None
|
|
finally:
|
|
if fp:
|
|
try:
|
|
os.unlink(fn)
|
|
except os.error:
|
|
pass
|
|
except IOError, msg:
|
|
print "can't write", fn, ":", msg
|
|
else:
|
|
result = marshal.load(fp)
|
|
fp.close()
|
|
##assert len(result) == n
|
|
# Shuffle it a bit...
|
|
for i in range(10):
|
|
i = whrandom.randint(0, n-1)
|
|
temp = result[:i]
|
|
del result[:i]
|
|
temp.reverse()
|
|
result[len(result):] = temp
|
|
del temp
|
|
return result
|
|
|
|
def fl():
|
|
sys.stdout.flush()
|
|
|
|
def doit(L):
|
|
t0 = time.clock()
|
|
L.sort()
|
|
t1 = time.clock()
|
|
print "%6.2f" % (t1-t0),
|
|
fl()
|
|
|
|
def tabulate(r):
|
|
"""Tabulate sort speed for lists of various sizes.
|
|
|
|
The sizes are 2**i for i in r (the argument, a list).
|
|
|
|
The output displays i, 2**i, and the time to sort arrays of 2**i
|
|
floating point numbers with the following properties:
|
|
|
|
*sort: random data
|
|
\sort: descending data
|
|
/sort: ascending data
|
|
~sort: many duplicates
|
|
-sort: all equal
|
|
!sort: worst case scenario
|
|
|
|
"""
|
|
cases = ("*sort", "\\sort", "/sort", "~sort", "-sort", "!sort")
|
|
fmt = ("%2s %6s" + " %6s"*len(cases))
|
|
print fmt % (("i", "2**i") + cases)
|
|
for i in r:
|
|
n = 1<<i
|
|
L = randrange(n)
|
|
##assert len(L) == n
|
|
print "%2d %6d" % (i, n),
|
|
fl()
|
|
doit(L) # *sort
|
|
L.reverse()
|
|
doit(L) # \sort
|
|
doit(L) # /sort
|
|
if n > 4:
|
|
del L[4:]
|
|
L = L*(n/4)
|
|
L = map(lambda x: --x, L)
|
|
doit(L) # ~sort
|
|
del L
|
|
L = map(abs, [-0.5]*n)
|
|
doit(L) # -sort
|
|
L = range(n/2-1, -1, -1)
|
|
L[len(L):] = range(n/2)
|
|
doit(L) # !sort
|
|
print
|
|
|
|
def main():
|
|
"""Main program when invoked as a script.
|
|
|
|
One argument: tabulate a single row.
|
|
Two arguments: tabulate a range (inclusive).
|
|
Extra arguments are used to seed the random generator.
|
|
|
|
"""
|
|
import string
|
|
# default range (inclusive)
|
|
k1 = 15
|
|
k2 = 19
|
|
if sys.argv[1:]:
|
|
# one argument: single point
|
|
k1 = k2 = string.atoi(sys.argv[1])
|
|
if sys.argv[2:]:
|
|
# two arguments: specify range
|
|
k2 = string.atoi(sys.argv[2])
|
|
if sys.argv[3:]:
|
|
# derive random seed from remaining arguments
|
|
x, y, z = 0, 0, 0
|
|
for a in sys.argv[3:]:
|
|
h = hash(a)
|
|
h, d = divmod(h, 256)
|
|
h = h & 0xffffff
|
|
x = (x^h^d) & 255
|
|
h = h>>8
|
|
y = (y^h^d) & 255
|
|
h = h>>8
|
|
z = (z^h^d) & 255
|
|
whrandom.seed(x, y, z)
|
|
r = range(k1, k2+1) # include the end point
|
|
tabulate(r)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|