[英]Numpy dot operation is not using all cpu cores
我在两个矩阵上做了numpy dot product(让我们假设a和b是两个矩阵)。
当a的形状是(10000,10000)并且b的形状是(1,10000)时,numpy.dot(a,bT)正在使用所有CPU核心。
但是当a的形状为(10000,10000)并且b的形状为(2,10000)时,numpy.dot(a,bT)不使用所有CPU核心(仅使用一个)。
当b的行大小为2到15(即从(2,10000)到(15,10000)时)会发生这种情况。
例:
import numpy as np
a = np.random.rand(10**4, 10**4)
def dot(a, b_row_size):
b = np.random.rand(b_row_size, 10**4)
for i in range(10):
# dot operation
x = np.dot(a, b.T)
# Using all CPU cores
dot(a, 1)
# Using only one CPU core
dot(a, 2)
# Using only one CPU core
dot(a, 5)
# Using only one CPU core
dot(a, 15)
# Using all CPU cores
dot(a, 16)
# Using all CPU cores
dot(a, 50)
np.show_config()
openblas_lapack_info:
define_macros = [('HAVE_CBLAS', None)]
libraries = ['openblas', 'openblas']
library_dirs = ['/usr/local/lib']
language = c
lapack_opt_info:
define_macros = [('HAVE_CBLAS', None)]
libraries = ['openblas', 'openblas']
library_dirs = ['/usr/local/lib']
language = c
blas_mkl_info:
NOT AVAILABLE
lapack_mkl_info:
NOT AVAILABLE
blas_opt_info:
define_macros = [('HAVE_CBLAS', None)]
libraries = ['openblas', 'openblas']
library_dirs = ['/usr/local/lib']
language = c
blis_info:
NOT AVAILABLE
openblas_info:
define_macros = [('HAVE_CBLAS', None)]
libraries = ['openblas', 'openblas']
library_dirs = ['/usr/local/lib']
language = c
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