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
5502.610.7058,040575  46% 53% 41% 30% 38% 67% 55% 64%

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
# Concurrency by Jason Stitt
# 2to3

from multiprocessing import Pool
from math            import sqrt

from sys             import argv

def eval_A (i, j):
    return 1.0 / ((i + j) * (i + j + 1) / 2 + i + 1)

def eval_A_times_u (u):
    args = ((i,u) for i in range(len(u)))
    return pool.map(part_A_times_u, args)

def eval_At_times_u (u):
    args = ((i,u) for i in range(len(u)))
    return pool.map(part_At_times_u, args)

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

def part_A_times_u(xxx_todo_changeme):
    (i,u) = xxx_todo_changeme
    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(xxx_todo_changeme1):
    (i,u) = xxx_todo_changeme1
    partial_sum = 0
    for j, u_j in enumerate(u):
        partial_sum += eval_A (j, i) * u_j
    return partial_sum

def main():
    n = int(argv[1])
    u = [1] * 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

    print("%0.9f" % (sqrt(vBv/vv)))

pool = Pool(processes=4)
main()

 make, command-line, and program output logs

 Sun, 23 Apr 2023 09:39:34 GMT

MAKE:
make[1]: Vstupuje se do adresáře „/home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp“
nuitka3 --remove-output spectralnorm.nuitka-5.nuitka
Nuitka-Options:INFO: Used command line options: --remove-output spectralnorm.nuitka-5.nuitka
Nuitka-Options:WARNING: You did not specify to follow or include anything but main program. Check options and make sure that is intended.
Nuitka:INFO: Starting Python compilation with Nuitka '1.5' on Python '3.10' commercial grade 'not installed'.
Nuitka-Plugins:INFO: multiprocessing: Injecting pre-module load code for module 'multiprocessing':
Nuitka-Plugins:INFO: multiprocessing:     Monkey patching "multiprocessing" load environment.
Nuitka-Plugins:INFO: multiprocessing: Injecting post-module load code for module 'multiprocessing':
Nuitka-Plugins:INFO: multiprocessing:     Monkey patching "multiprocessing" for compiled methods.
Nuitka:INFO: Completed Python level compilation and optimization.
Nuitka:INFO: Generating source code for C backend compiler.
Nuitka:INFO: Running data composer tool for optimal constant value handling.
Nuitka:INFO: Running C compilation via Scons.
Nuitka-Scons:INFO: Backend C compiler: gcc (gcc).
Nuitka-Scons:INFO: Backend linking program with 10 files (no progress information available).
Nuitka-Scons:WARNING: You are not using ccache.
Nuitka:INFO: Removing build directory 'spectralnorm.nuitka-5.nuitka.build'.
Nuitka:INFO: Successfully created 'spectralnorm.nuitka-5.nuitka.bin'.
cp spectralnorm.nuitka-5.nuitka.bin spectralnorm.nuitka-5.nuitka_run
make[1]: Opouští se adresář „/home/dundee/work/pybenchmarks/bencher/tmp/spectralnorm/tmp“
19.09s to complete and log all make actions

COMMAND LINE:
 ./spectralnorm.nuitka-5.nuitka_run 550

PROGRAM OUTPUT:
1.274224125

Exception ignored in: <function Pool.__del__ at 0x7f22b3161900>
Traceback (most recent call last):
  File "/usr/lib/python3.10/multiprocessing/pool.py", line 271, in __del__
  File "/usr/lib/python3.10/multiprocessing/queues.py", line 377, in put
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 200, in send_bytes
  File "/usr/lib/python3.10/multiprocessing/connection.py", line 400, in _send_bytes
AttributeError: 'NoneType' object has no attribute 'pack'

Revised BSD license

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