Openstack RDO && KVM Hypervisor: Building Fibonacci sequence via Python C++ Extensions on Fedora Linux 34

Building Fibonacci sequence is supposed to be performed by C++ code below as a procedure invoked from Python via Python API.

Per https://www.mygreatlearning.com/blog/vectors-in-c/

Vectors are part of STL. Vectors in C++ are sequence containers representing arrays that can change their size during runtime . They use contiguous storage locations for their elements just as efficiently as in arrays, which means that their elements can also be accessed using offsets on regular pointers to its elements.

(.env) [boris@fedora33server FIBOPLUS]$ cat fibos.h

#pragma once

#include <vector>

#include <cstddef>

namespace xps {

std::vector<int> fibosList(int lim_up) ;

} // namespace xps

(.env) [boris@fedora33server FIBOPLUS]$ cat fibos.cpp

#include <iostream>

#include <vector>

#include "fibos.h"

namespace xps {

int cpp_fib(int n)

{

if (n < 2)

return n;

else

return cpp_fib(n-1)+cpp_fib(n-2);

}

std::vector<int> fibosList(int lim_up)

{

std::vector<int> result;

int n;

for(n=0; n <= lim_up; n++)

{

result.push_back(cpp_fib(n));

}

return result;

}

} //namespace

(.env) [boris@fedora33server FIBOPLUS]$ cat fibos_wrapper.cpp

#include <Python.h>

#include <iostream>

#include <vector>

#include "fibos.h"

#pragma GCC diagnostic ignored "-Wsign-compare"

// Our Python binding to our C function

extern "C"{}

namespace {

static PyObject *fibos(PyObject* self, PyObject* args)

{

int m;

if(!PyArg_ParseTuple(args,"i",&m))

return NULL;

std::vector<int>fibos = xps::fibosList(m);

PyObject* result = PyList_New(fibos.size());

for(int i = 0; i < fibos.size(); i++) {

PyList_SetItem(result, i, PyLong_FromLong(fibos[i]));

}

return result;

}

// Our Module's Function Definition struct

// We require this `NULL` to signal the end of our method

// definition

static PyMethodDef myMethods[] = {

{ "fibos", fibos, METH_VARARGS, "Calculate prime numbers" },

{ NULL, NULL, 0, NULL }

};

// Our Module Definition struct

static struct PyModuleDef myModule = {

PyModuleDef_HEAD_INIT,

"myModule",

"Test Module",

-1,

myMethods

};

// Initializes our module using our above struct

PyMODINIT_FUNC PyInit_myModule(void)

{

return PyModule_Create(&myModule);

};

} // namespace

(.env) [boris@fedora33server FIBOPLUS]$ cat setup.py

from distutils.core import setup, Extension

import sysconfig

language = 'c++'

std = 'c++20'

default_compile_args = sysconfig.get_config_var('CFLAGS').split()

extra_compile_args = [f"-std={std}", "-Wall", "-Wextra", "-Werror", "-DNDEBUG", "-O3"]

setup(name = 'myModule', version = '1.0', \

ext_modules = [Extension('myModule', ['fibos_wrapper.cpp','fibos.cpp'])])

(.env) [boris@fedora33server FIBOPLUS]$ python setup.py install

running install

running build

running build_ext

building 'myModule' extension

creating build

creating build/temp.linux-x86_64-3.9

gcc -pthread -Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/home/boris/FIBOPLUS/.env/include -I/usr/include/python3.9 -c fibos.cpp -o build/temp.linux-x86_64-3.9/fibos.o

creating build/lib.linux-x86_64-3.9

g++ -pthread -shared -Wl,-z,relro -Wl,--as-needed -Wl,-z,now -g -Wl,-z,relro -Wl,--as-needed -Wl,-z,now -g build/temp.linux-x86_64-3.9/fibos.o build/temp.linux-x86_64-3.9/fibos_wrapper.o -L/usr/lib64 -o build/lib.linux-x86_64-3.9/myModule.cpython-39-x86_64-linux-gnu.so

running install_lib

copying build/lib.linux-x86_64-3.9/myModule.cpython-39-x86_64-linux-gnu.so -> /home/boris/FIBOPLUS/.env/lib64/python3.9/site-packages

running install_egg_info

Removing /home/boris/FIBOPLUS/.env/lib64/python3.9/site-packages/myModule-1.0-py3.9.egg-info

Writing /home/boris/FIBOPLUS/.env/lib64/python3.9/site-packages/myModule-1.0-py3.9.egg-info

(.env) [boris@fedora33server FIBOPLUS]$ ll

total 24

drwxrwxr-x. 4 boris boris 63 Jun 26 18:41 build

-rw-rw-r--. 1 boris boris 394 Jun 26 18:34 fibos.cpp

-rw-rw-r--. 1 boris boris 131 Jun 26 18:28 fibos.h

-rw-rw-r--. 1 boris boris 1215 Jun 26 18:37 fibos_wrapper.cpp

-rw-rw-r--. 1 boris boris 84 Jun 26 18:06 MyProgList.py

-rw-rw-r--. 1 boris boris 280 Jun 26 17:43 MyProg.py

-rw-rw-r--. 1 boris boris 368 Jun 26 18:31 setup.py

(.env) [boris@fedora33server FIBOPLUS]$ cat MyProgList.py

import myModule

a = int(input("\nInput upper limit : "))

print(myModule.fibos(a))

(.env) [boris@fedora33server FIBOPLUS]$ python MyProgList.py

Input upper limit : 11

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]

(.env) [boris@fedora33server FIBOPLUS]$ python MyProgList.py

Input upper limit : 13

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]

(.env) [boris@fedora33server FIBOPLUS]$ python MyProgList.py

Input upper limit : 15

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]

(.env) [boris@fedora33server FIBOPLUS]$ python MyProgList.py

Input upper limit : 17

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597]

Openstack RDO && KVM Hypervisor

Saturday, June 26, 2021

Building Fibonacci sequence via Python C++ Extensions on Fedora Linux 34

No comments:

Post a Comment

Blog Archive