vector_add_2.py

# Required imports for the exercise
from pycuda import autoinit
from pycuda import gpuarray
import numpy as np
from pycuda.elementwise import ElementwiseKernel

# Initialize vectors "a" and "b" with some numbers,
# and vector "c" with zeros
# Use numpy to define single precision vectors
aux = range(150000)
a = np.array(aux).astype(np.float32)
b = (a*a).astype(np.float32)
c = np.zeros(len(aux)).astype(np.float32)

# Create the corresponding vectors in GPU memory
a_gpu = gpuarray.to_gpu(a)
b_gpu = gpuarray.to_gpu(b)
c_gpu = gpuarray.to_gpu(c)

# Define a CUDA function for vector addition
# using an element-wise kernel
myCudaFunc = ElementwiseKernel(arguments = "float *a, float *b, float *c",
                               operation = "c[i] = a[i]+b[i]",
                               name = "mySumK")

# Call the created function
myCudaFunc(a_gpu,b_gpu,c_gpu)

# Get the result
c = c_gpu.get()