How to install Xtensor

Xtensor 系列主要包含 xtl, xsimd, xtensor-blas，xtensor-fftw 和 xtensor

1. Install xtl

1. git clone
2. make from source

mkdir build
cd build
cmake ..
sudo make install

2. Install xsimd

• git clone
• set flags in CMakeList. txt
  • OPTION (ENABLE_FALLBACK "build tests/benchmarks with fallback implementation" ON)
  • OPTION (ENABLE_XTL_COMPLEX "enables support for xcomplex defined in xtl" ON)
  • OPTION(BUILD_EXAMPLES "xsimd examples" ON)
  • 其他几项不要设置为 On，否则可能编译出错
• mkdir build; cd build
• cmake ..
• make install

在 build 下有一个 benchmark，名为 mandelbrot，其结果如下，可以发现采用 AVX2 指令时，速度最快

$ ./mandelbrot 
starting benchmarks (results in 'ms')... 

scalar Statistics:
        max: 118
        min: 116
        median: 117
        median abs dev: 0
        mean: 116
        std dev: 0
        # of samples: 64

omp Statistics:
        max: 119
        min: 116
        median: 117
        median abs dev: 0
        mean: 116
        std dev: 1
        # of samples: 64

fma3+avx2 Statistics:
        max: 17
        min: 17
        median: 17
        median abs dev: 0
        mean: 17
        std dev: 0
        # of samples: 64

avx2 Statistics:
        max: 17
        min: 16
        median: 17
        median abs dev: 0
        mean: 16
        std dev: 0
        # of samples: 64

fma3+avx Statistics:
        max: 18
        min: 17
        median: 17
        median abs dev: 0
        mean: 17
        std dev: 0
        # of samples: 64

avx Statistics:
        max: 18
        min: 17
        median: 17
        median abs dev: 0
        mean: 17
        std dev: 0
        # of samples: 64

sse4.2 Statistics:
        max: 32
        min: 31
        median: 31
        median abs dev: 0
        mean: 31
        std dev: 0
        # of samples: 64

sse4.1 Statistics:
        max: 32
        min: 31
        median: 31
        median abs dev: 0
        mean: 31
        std dev: 0
        # of samples: 64

ssse3 Statistics:
        max: 32
        min: 32
        median: 32
        median abs dev: 0
        mean: 32
        std dev: 0
        # of samples: 64

sse3 Statistics:
        max: 32
        min: 32
        median: 32
        median abs dev: 0
        mean: 32
        std dev: 0
        # of samples: 64

sse2 Statistics:
        max: 32
        min: 32
        median: 32
        median abs dev: 0
        mean: 32
        std dev: 0
        # of samples: 64

3. 下载头文件

Xtensor, Xtensor-blas 和 xtensor-fftw 以头文件形式进行使用
例子