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

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 performance measurements

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

N	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
10	56.75	56.77	15,068	552	2% 1% 1% 1% 1% 100% 1% 1%

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

Read fannkuch-redux benchmark to see what this program should do.

 notes

 fannkuch-redux RustPython #6 program source code

# The Computer Language Benchmarks Game
# http://benchmarksgame.alioth.debian.org/

#    contributed by Isaac Gouy
#    converted to Java by Oleg Mazurov
#    converted to Python by Buck Golemon
#    modified by Justin Peel

def fannkuch(n):
    maxFlipsCount = 0
    permSign = True
    checksum = 0

    perm1 = list(range(n))
    count = perm1[:]
    rxrange = range(2, n - 1)
    nm = n - 1
    while 1:
        k = perm1[0]
        if k:
            perm = perm1[:]
            flipsCount = 1
            kk = perm[k]
            while kk:
                perm[:k+1] = perm[k::-1]
                flipsCount += 1
                k = kk
                kk = perm[kk]
            if maxFlipsCount < flipsCount:
                maxFlipsCount = flipsCount
            checksum += flipsCount if permSign else -flipsCount

        # Use incremental change to generate another permutation
        if permSign:
            perm1[0],perm1[1] = perm1[1],perm1[0]
            permSign = False
        else:
            perm1[1],perm1[2] = perm1[2],perm1[1]
            permSign = True
            for r in rxrange:
                if count[r]:
                    break
                count[r] = r
                perm0 = perm1[0]
                perm1[:r+1] = perm1[1:r+2]
                perm1[r+1] = perm0
            else:
                r = nm
                if not count[r]:
                    print( checksum )
                    return maxFlipsCount
            count[r] -= 1
from sys import argv
n = int(argv[1])

print(( "Pfannkuchen(%i) = %i" % (n, fannkuch(n)) ))

 make, command-line, and program output logs

 Wed, 28 Sep 2022 08:54:08 GMT

COMMAND LINE:
 /usr/bin/rustpython fannkuchredux.rustpython-6.rustpython 10

PROGRAM OUTPUT:
73196
Pfannkuchen(10) = 38

encodings initialization failed. Only utf-8 encoding will be supported.
ModuleNotFoundError: No module named 'encodings'

The above exception was the direct cause of the following exception:

RuntimeError: Could not import encodings. Is your RUSTPYTHONPATH set? If you don't have access to a consistent external environment (e.g. if you're embedding rustpython in another application), try enabling the freeze-stdlib feature

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