performance measurements

Each table row shows performance measurements for this Python 3 program with a particular command-line input value N.

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
5008.838.834,332449  0% 0% 1% 100%
3,000321.73321.824,336449  1% 100% 0% 0%
5,5001,046.181,046.474,336449  0% 0% 1% 100%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read spectral-norm benchmark to see what this program should do.

 notes

Python 3.4.0 (default, Mar 17 2014, 08:23:52) [GCC 4.8.1] on linux

 spectral-norm Python 3 #8 program source code

# The Computer Language Benchmarks Game
# http://benchmarksgame.alioth.debian.org/
#
# Contributed by Sebastien Loisel
# Fixed by Isaac Gouy
# Sped up by Josh Goldfoot
# Dirtily sped up by Simon Descarpentries
# Sped up by Joseph LaFata

from array     import array
from math      import sqrt
from sys       import argv
import sys

if sys.version_info < (3, 0):
    from itertools import izip as zip
else:
    xrange = range

def eval_A (i, j):
    return 1.0 / (((i + j) * (i + j + 1) >> 1) + i + 1)

def eval_A_times_u (u, resulted_list):
    u_len = len (u)
    local_eval_A = eval_A
    
    for i in xrange (u_len):
        partial_sum = 0
        
        j = 0
        while j < u_len:
            partial_sum += local_eval_A (i, j) * u[j]
            j += 1
        
        resulted_list[i] = partial_sum

def eval_At_times_u (u, resulted_list):
    u_len = len (u)
    local_eval_A = eval_A
    
    for i in xrange (u_len):
        partial_sum = 0
        
        j = 0
        while j < u_len:
            partial_sum += local_eval_A (j, i) * u[j]
            j += 1
        
        resulted_list[i] = partial_sum

def eval_AtA_times_u (u, out, tmp):
    eval_A_times_u (u, tmp)
    eval_At_times_u (tmp, out)

def main():
    n = int (argv [1])
    u = array("d", [1]) * n
    v = array("d", [1]) * n
    tmp = array("d", [1]) * n
    local_eval_AtA_times_u = eval_AtA_times_u
    
    for dummy in xrange (10):
        local_eval_AtA_times_u (u, v, tmp)
        local_eval_AtA_times_u (v, u, tmp)
    
    vBv = vv = 0
    
    for ue, ve in zip (u, v):
        vBv += ue * ve
        vv  += ve * ve
    
    print("%0.9f" % (sqrt(vBv/vv)))

main() 

 make, command-line, and program output logs

Tue, 18 Mar 2014 20:27:49 GMT

MAKE:
mv spectralnorm.python3-8.python3 spectralnorm.python3-8.py
0.01s to complete and log all make actions

COMMAND LINE:
/usr/local/src/Python-3.4.0/bin/python3.4 spectralnorm.python3-8.py 5500

PROGRAM OUTPUT:
1.274224153

Revised BSD license

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