8.6.4.1 : Reduction with numpy functions



Now, let's write the reductionNumpyPython.py file :



We need also to import several packages :

  • sys : to make an output compatible with C++ performances output
  • numpy : to deal with arrays
  • astericshpc : to allocate arrays and do the performance test 


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import sys
import numpy as np
import astericshpc


The function to evaluate performances is built the same way such as the C++ one :

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def getTimeFunctionSize(nbRepetition, nbElement):
	tabX = np.asarray(np.random.random(nbElement), dtype=np.float32)
	
	timeBegin = astericshpc.rdtsc()
	for i in range(0, nbRepetition):
		res = tabX.sum()
	
	timeEnd = astericshpc.rdtsc()
	elapsedTime = float(timeEnd - timeBegin)/float(nbRepetition)
	elapsedTimePerElement = elapsedTime/float(nbElement)
	print("nbElement =",nbElement,", elapsedTimePerElement =",elapsedTimePerElement,"cy/el",", elapsedTime =",elapsedTime,"cy")
	print(str(nbElement) + "\t" + str(elapsedTimePerElement) + "\t" + str(elapsedTime),file=sys.stderr)


Then, we have a function to make all the points with a list of sizes :

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def makeElapsedTimeValue(listSize, nbRepetition):
	for val in listSize:
		getTimeFunctionSize(nbRepetition, val)


Finally, we call the performances tests only if this script is executed as a main file and not if it is included by an other file :

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if __name__ == "__main__":
	listSize = [	1024,
			2048,
			3072,
			4992,
			10048]
	makeElapsedTimeValue(listSize, 1000000)


The full reductionNumpyPython.py file :

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'''
	Auteur : Pierre Aubert
	Mail : pierre.aubert@lapp.in2p3.fr
	Licence : CeCILL-C
'''

import sys
import numpy as np
import astericshpc

def getTimeFunctionSize(nbRepetition, nbElement):
	tabX = np.asarray(np.random.random(nbElement), dtype=np.float32)
	
	timeBegin = astericshpc.rdtsc()
	for i in range(0, nbRepetition):
		res = tabX.sum()
	
	timeEnd = astericshpc.rdtsc()
	elapsedTime = float(timeEnd - timeBegin)/float(nbRepetition)
	elapsedTimePerElement = elapsedTime/float(nbElement)
	print("nbElement =",nbElement,", elapsedTimePerElement =",elapsedTimePerElement,"cy/el",", elapsedTime =",elapsedTime,"cy")
	print(str(nbElement) + "\t" + str(elapsedTimePerElement) + "\t" + str(elapsedTime),file=sys.stderr)

def makeElapsedTimeValue(listSize, nbRepetition):
	for val in listSize:
		getTimeFunctionSize(nbRepetition, val)

if __name__ == "__main__":
	listSize = [	1024,
			2048,
			3072,
			4992,
			10048]
	makeElapsedTimeValue(listSize, 1000000)


You can download it here.