Cython include stdio h bla h inline int

בסיסי Cython #include <stdio. h> bla. h inline int my_func(int x) { printf(“my func %dn”, x); return 0; } cdef extern from “bla. h”: int my_func(int) bla. pyx def pymy_func(x): return my_func(x) import bla print bla. pymy_func(10) main. py

Distutils setup. py from distutils. core import setup from distutils. extension import Extension from Cython. Distutils import build_ext setup. py setup(cmdclass={'build_ext': build_ext}, ext_modules=[Extension(“bla", ['bla. pyx'])]) $ python setup. py build_ext --inplace בנייה running build_ext cythoning bla. pyx to bla. c building 'bla' extension gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O 2 -Wall Wstrict-prototypes -f. PIC -I/usr/include/python 2. 6 -c bla. c -o build/temp. linux-i 686 -2. 6/bla. o gcc -pthread -shared -Wl, -O 1 -Wl, -Bsymbolic-functions build/temp. linuxi 686 -2. 6/bla. o -o /mnt/filer_home/users/t_sion/bla. so

מימוש פייתוני import array pyencode. py lookup = {} for i in range(256): lookup[chr(i)] = chr(i) + chr(i ^ 0 x. FF) def encode(arr): out = array('c', 'x 00' * len(arr) * 2) for i in xrange(len(arr)): data = lookup[arr[i]] out[2*i] = data[0] out[2*i + 1] = data[1] return out

המשך - מימוש פייתוני In [10]: s = array('c', 'x 01xf 3x 34x 45' * (10 ** 6)) In [11]: import pyencode In [12]: %timeit -n 3 pyencode(s) 3 loops, best of 3: 2. 84 s per loop

פשוט cython מימוש למודול cython רק מקומפל עם , אותו קוד cyencode_simple In [13]: import cyencode_simple In [14]: %timeit -n 3 cyencode_simple. encode(s) 3 loops, best of 3: 1. 62 s per loop

מתקדם cython מימוש import array cdef unsigned short lookup[256] cdef unsigned char *_ptr for i in range(256): _ptr = <unsigned char*>(&lookup[i]) _ptr[0] = <int>i _ptr[1] = <int>(i ^ 0 x. FF) cyencode. py def encode(arr): cdef int i cdef unsigned char *in_ptr, *out_ptr, *p in_ptr = <unsigned char*><unsigned int>(arr. buffer_info()[0]) out = array('c', 'x 00' * len(arr) * 2) out_ptr = <unsigned char*><unsigned int>(out. buffer_info()[0]) for i in range(len(arr)): p = <unsigned char*>(&lookup[<int>in_ptr[i]]) out_ptr[2*i] = p[0] out_ptr[2*i + 1] = p[1] return out

המשך - מתקדם cython מימוש In [15]: import cyencode In [16]: %timeit -n 3 cyencode(s) 3 loops, best of 3: 26. 8 ms per loop

C מתקדם – הצצה לקוד cython מימוש for (__pyx_t_6 = 0; __pyx_t_6 < __pyx_t_4; __pyx_t_6+=1) { __pyx_v_i = __pyx_t_6; cyencode. c /* "cyencode. pyx": 17 * p = <unsigned char*>(&lookup[<int>in_ptr[i]]) # <<<<<<< */ __pyx_v_p = ((unsigned char *)(&(__pyx_v_8 cyencode_lookup[ ((int)(__pyx_v_in_ptr[__pyx_v_i]))]))); /* "cyencode. pyx": 18 * out_ptr[2*i] = p[0] # <<<<<<< */ (__pyx_v_out_ptr[(2 * __pyx_v_i)]) = (__pyx_v_p[0]); /* "cyencode. pyx": 19 * out_ptr[2*i + 1] = p[1] # <<<<<<< */ (__pyx_v_out_ptr[((2 * __pyx_v_i) + 1)]) = (__pyx_v_p[1]); }

Pitfalls GIL Reference counting cdef functions טיפול בשגיאות ב

מידע נוסף http: //docs. cython. org : cython תיעוד טוב tutorial כולל sion. schori@gmail : במייל שלי