~linaro-toolchain-dev/cortex-strings/trunk

import ctypes

import timeit

import pprint

import gc

from pylab import *

plain = ctypes.cdll.LoadLibrary("install/lib/libplain.so")

helpers = ctypes.cdll.LoadLibrary("install/lib/libhelpers.so")

dest = ctypes.create_string_buffer(1024)

src = ctypes.create_string_buffer('Hi there', 1024)

def run(fun):

    timer = timeit.default_timer

    gcold = gc.isenabled()

    gc.disable()

    t0 = timer()

    fun()

    t1 = timer()

    if gcold:

        gc.enable()

    return t1 - t0

# Calculate a good number of loops

loops = 100000

while True:

    elapsed = run(lambda: helpers.spawniis(plain.memcpy, loops, dest, src, 20))

    print loops, elapsed

    if elapsed < 0.1:

        loops *= 10

    else:

        loops *= 2/elapsed

        base = 10**(int(math.log10(loops)))

        loops = int(loops/base + 1) * base

        print loops

        break

# Calculate the call overhead

elapsed = run(lambda: helpers.spawniis(helpers.bounce, loops, dest, src, 20))

print elapsed

elapsed = run(lambda: helpers.spawniis(plain.memcpy, loops, dest, src, 20))

print elapsed