performance measurements
Each table row shows performance measurements for this program with a particular command-line input value N.
| N | CPU secs | Elapsed secs | Memory KB | Code B | ≈ CPU Load |
|---|
Read the ↓ make, command line, and program output logs to see how this program was run.
Read benchmark to see what this program should do.
notes
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
cdef float eval_A(int i, int j):
return 1.0 / (((i + j) * (i + j + 1) >> 1) + i + 1)
def eval_A_times_u(u, resulted_list):
cdef int u_len, i, j, partial_sum
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):
cdef int u_len, i, j, partial_sum
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():
cdef int n, dummy, vBv, vv, ue, ve
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
Sun, 23 Apr 2023 09:39:39 GMT MAKE: make[1]: Vstupuje se do adresáře „/home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp“ cp spectralnorm.cython-8.cython `echo spectralnorm.cython-8.cython | sed 's/cython-..//' | sed 's/.cython//'`.pyx cythonize -3 -bi `echo spectralnorm.cython-8.cython | sed 's/cython-..//' | sed 's/.cython//'`.pyx Compiling /home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp/spectralnorm.pyx because it changed. [1/1] Cythonizing /home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp/spectralnorm.pyx make[1]: Opouští se adresář „/home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp“ 2.84s to complete and log all make actions COMMAND LINE: /usr/bin/python3 -c "import spectralnorm" 550 UNEXPECTED OUTPUT 1c1 < 1.000000000 --- > 1.274224125 PROGRAM OUTPUT: 1.000000000