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# -*- coding: utf-8 -*-
# The Computer Language Benchmarks Game
# http://shootout.alioth.debian.org/
# Contributed by Sebastien Loisel
# Fixed by Isaac Gouy
# Sped up by Josh Goldfoot
# Dirtily sped up by Simon Descarpentries
# Concurrency by Jason Stitt
from time import time
import util
import optparse
def eval_A (i, j):
return 1.0 / ((i + j) * (i + j + 1) / 2 + i + 1)
def eval_A_times_u (u):
return [ part_A_times_u(i,u) for i in range(len(u)) ]
def eval_At_times_u (u):
return [ part_At_times_u(i,u) for i in range(len(u)) ]
def eval_AtA_times_u (u):
return eval_At_times_u (eval_A_times_u (u))
def part_A_times_u(i, u):
partial_sum = 0
for j, u_j in enumerate(u):
partial_sum += eval_A (i, j) * u_j
return partial_sum
def part_At_times_u(i, u):
partial_sum = 0
for j, u_j in enumerate(u):
partial_sum += eval_A (j, i) * u_j
return partial_sum
DEFAULT_N = 130
def main(n):
times = []
for i in range(n):
t0 = time()
u = [1] * DEFAULT_N
for dummy in range (10):
v = eval_AtA_times_u (u)
u = eval_AtA_times_u (v)
vBv = vv = 0
for ue, ve in zip (u, v):
vBv += ue * ve
vv += ve * ve
tk = time()
times.append(tk - t0)
return times
if __name__ == "__main__":
parser = optparse.OptionParser(
usage="%prog [options]",
description="Test the performance of the spectralnorm benchmark")
util.add_standard_options_to(parser)
options, args = parser.parse_args()
util.run_benchmark(options, options.num_runs, main)