Python Interpreters Benchmarks
x64 ArchLinux : AMD® Ryzen 7 4700U®

 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
# Used list comprehension by Vadim Zelenin
# 2to3

from math import sqrt
from sys import argv


cdef float eval_A(int i, int j):
    ij = i+j
    return 1.0 / (ij * (ij + 1) / 2 + i + 1)


def eval_A_times_u(u):
    cdef int i, j, u_j

    local_eval_A = eval_A

    return [
        sum([
            local_eval_A(i, j) * u_j for j, u_j in enumerate(u)
            ]) for i in range(len(u))
    ]


def eval_At_times_u(u):
    cdef int i, j, u_j

    local_eval_A = eval_A

    return [
        sum([
            local_eval_A(j, i) * u_j for j, u_j in enumerate(u)
            ]) for i in range(len(u))
    ]


def eval_AtA_times_u(u):
    return eval_At_times_u(eval_A_times_u(u))


def main():
    cdef int n, dummy, ue, ve, vBv, vv

    n = int(argv[1])
    u = [1] * n
    local_eval_AtA_times_u = eval_AtA_times_u

    for dummy in range(10):
        v = local_eval_AtA_times_u(u)
        u = local_eval_AtA_times_u(v)

    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 09:39:14 GMT

MAKE:
make[1]: Vstupuje se do adresáře „/home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp“
cp spectralnorm.cython-6.cython `echo spectralnorm.cython-6.cython | sed 's/cython-..//' | sed 's/.cython//'`.pyx
cythonize -3 -bi `echo spectralnorm.cython-6.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“
2.38s 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

Revised BSD license

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