Mit Cython ist ziemlich gut. Sie können Ihre C-Erweiterung mit einer Python-ähnlichen Syntax schreiben und C-Code generieren lassen. Kesselplatte enthalten. Da Sie den Code bereits in Python haben, müssen Sie nur ein paar Änderungen an Ihrem Engpasscode vornehmen und C-Code wird daraus generiert.
Beispiel. hello.pyx:
cdef int hello(int a, int b):
return a + b
Die 601 Zeilen Codetextvorschlag erzeugt:
/* Generated by Cython 0.10.3 on Mon Jan 19 08:24:44 2009 */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#ifndef PY_LONG_LONG
#define PY_LONG_LONG LONG_LONG
#endif
#ifndef DL_EXPORT
#define DL_EXPORT(t) t
#endif
#if PY_VERSION_HEX < 0x02040000
#define METH_COEXIST 0
#endif
#if PY_VERSION_HEX < 0x02050000
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#define PyInt_FromSsize_t(z) PyInt_FromLong(z)
#define PyInt_AsSsize_t(o) PyInt_AsLong(o)
#define PyNumber_Index(o) PyNumber_Int(o)
#define PyIndex_Check(o) PyNumber_Check(o)
#endif
#if PY_VERSION_HEX < 0x02060000
#define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
#define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
#define Py_SIZE(ob) (((PyVarObject*)(ob))->ob_size)
#define PyVarObject_HEAD_INIT(type, size) \
PyObject_HEAD_INIT(type) size,
#define PyType_Modified(t)
typedef struct {
void *buf;
PyObject *obj;
Py_ssize_t len;
Py_ssize_t itemsize;
int readonly;
int ndim;
char *format;
Py_ssize_t *shape;
Py_ssize_t *strides;
Py_ssize_t *suboffsets;
void *internal;
} Py_buffer;
#define PyBUF_SIMPLE 0
#define PyBUF_WRITABLE 0x0001
#define PyBUF_LOCK 0x0002
#define PyBUF_FORMAT 0x0004
#define PyBUF_ND 0x0008
#define PyBUF_STRIDES (0x0010 | PyBUF_ND)
#define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
#define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
#define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
#define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
#endif
#if PY_MAJOR_VERSION < 3
#define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
#else
#define __Pyx_BUILTIN_MODULE_NAME "builtins"
#endif
#if PY_MAJOR_VERSION >= 3
#define Py_TPFLAGS_CHECKTYPES 0
#define Py_TPFLAGS_HAVE_INDEX 0
#endif
#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
#define Py_TPFLAGS_HAVE_NEWBUFFER 0
#endif
#if PY_MAJOR_VERSION >= 3
#define PyBaseString_Type PyUnicode_Type
#define PyString_Type PyBytes_Type
#define PyInt_Type PyLong_Type
#define PyInt_Check(op) PyLong_Check(op)
#define PyInt_CheckExact(op) PyLong_CheckExact(op)
#define PyInt_FromString PyLong_FromString
#define PyInt_FromUnicode PyLong_FromUnicode
#define PyInt_FromLong PyLong_FromLong
#define PyInt_FromSize_t PyLong_FromSize_t
#define PyInt_FromSsize_t PyLong_FromSsize_t
#define PyInt_AsLong PyLong_AsLong
#define PyInt_AS_LONG PyLong_AS_LONG
#define PyInt_AsSsize_t PyLong_AsSsize_t
#define PyInt_AsUnsignedLongMask PyLong_AsUnsignedLongMask
#define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
#define __Pyx_PyNumber_Divide(x,y) PyNumber_TrueDivide(x,y)
#else
#define __Pyx_PyNumber_Divide(x,y) PyNumber_Divide(x,y)
#define PyBytes_Type PyString_Type
#endif
#if PY_MAJOR_VERSION >= 3
#define PyMethod_New(func, self, klass) PyInstanceMethod_New(func)
#endif
#if !defined(WIN32) && !defined(MS_WINDOWS)
#ifndef __stdcall
#define __stdcall
#endif
#ifndef __cdecl
#define __cdecl
#endif
#else
#define _USE_MATH_DEFINES
#endif
#ifdef __cplusplus
#define __PYX_EXTERN_C extern "C"
#else
#define __PYX_EXTERN_C extern
#endif
#include <math.h>
#define __PYX_HAVE_API__helloworld
#ifdef __GNUC__
#define INLINE __inline__
#elif _WIN32
#define INLINE __inline
#else
#define INLINE
#endif
typedef struct
{PyObject **p; char *s; long n;
char is_unicode; char intern; char is_identifier;}
__Pyx_StringTabEntry; /*proto*/
static int __pyx_skip_dispatch = 0;
/* Type Conversion Predeclarations */
#if PY_MAJOR_VERSION < 3
#define __Pyx_PyBytes_FromString PyString_FromString
#define __Pyx_PyBytes_AsString PyString_AsString
#else
#define __Pyx_PyBytes_FromString PyBytes_FromString
#define __Pyx_PyBytes_AsString PyBytes_AsString
#endif
#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
static INLINE int __Pyx_PyObject_IsTrue(PyObject* x);
static INLINE PY_LONG_LONG __pyx_PyInt_AsLongLong(PyObject* x);
static INLINE unsigned PY_LONG_LONG __pyx_PyInt_AsUnsignedLongLong(PyObject* x);
static INLINE Py_ssize_t __pyx_PyIndex_AsSsize_t(PyObject* b);
#define __pyx_PyInt_AsLong(x) (PyInt_CheckExact(x) ? PyInt_AS_LONG(x) : PyInt_AsLong(x))
#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
static INLINE unsigned char __pyx_PyInt_unsigned_char(PyObject* x);
static INLINE unsigned short __pyx_PyInt_unsigned_short(PyObject* x);
static INLINE char __pyx_PyInt_char(PyObject* x);
static INLINE short __pyx_PyInt_short(PyObject* x);
static INLINE int __pyx_PyInt_int(PyObject* x);
static INLINE long __pyx_PyInt_long(PyObject* x);
static INLINE signed char __pyx_PyInt_signed_char(PyObject* x);
static INLINE signed short __pyx_PyInt_signed_short(PyObject* x);
static INLINE signed int __pyx_PyInt_signed_int(PyObject* x);
static INLINE signed long __pyx_PyInt_signed_long(PyObject* x);
static INLINE long double __pyx_PyInt_long_double(PyObject* x);
#ifdef __GNUC__
/* Test for GCC > 2.95 */
#if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95))
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#else /* __GNUC__ > 2 ... */
#define likely(x) (x)
#define unlikely(x) (x)
#endif /* __GNUC__ > 2 ... */
#else /* __GNUC__ */
#define likely(x) (x)
#define unlikely(x) (x)
#endif /* __GNUC__ */
static PyObject *__pyx_m;
static PyObject *__pyx_b;
static PyObject *__pyx_empty_tuple;
static int __pyx_lineno;
static int __pyx_clineno = 0;
static const char * __pyx_cfilenm= __FILE__;
static const char *__pyx_filename;
static const char **__pyx_f;
static void __Pyx_AddTraceback(const char *funcname); /*proto*/
/* Type declarations */
/* Module declarations from helloworld */
static int __pyx_f_10helloworld_hello(int, int); /*proto*/
/* Implementation of helloworld */
/* "/home/nosklo/devel/ctest/hello.pyx":1
* cdef int hello(int a, int b): # <<<<<<<<<<<<<<
* return a + b
*
*/
static int __pyx_f_10helloworld_hello(int __pyx_v_a, int __pyx_v_b) {
int __pyx_r;
/* "/home/nosklo/devel/ctest/hello.pyx":2
* cdef int hello(int a, int b):
* return a + b # <<<<<<<<<<<<<<
*
*/
__pyx_r = (__pyx_v_a + __pyx_v_b);
goto __pyx_L0;
__pyx_r = 0;
__pyx_L0:;
return __pyx_r;
}
static struct PyMethodDef __pyx_methods[] = {
{0, 0, 0, 0}
};
static void __pyx_init_filenames(void); /*proto*/
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef __pyx_moduledef = {
PyModuleDef_HEAD_INIT,
"helloworld",
0, /* m_doc */
-1, /* m_size */
__pyx_methods /* m_methods */,
NULL, /* m_reload */
NULL, /* m_traverse */
NULL, /* m_clear */
NULL /* m_free */
};
#endif
static int __Pyx_InitCachedBuiltins(void) {
return 0;
return -1;
}
static int __Pyx_InitGlobals(void) {
return 0;
return -1;
}
#if PY_MAJOR_VERSION < 3
PyMODINIT_FUNC inithelloworld(void); /*proto*/
PyMODINIT_FUNC inithelloworld(void)
#else
PyMODINIT_FUNC PyInit_helloworld(void); /*proto*/
PyMODINIT_FUNC PyInit_helloworld(void)
#endif
{
__pyx_empty_tuple = PyTuple_New(0);
if (unlikely(!__pyx_empty_tuple))
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 1;
__pyx_clineno = __LINE__; goto __pyx_L1_error;}
/*--- Library function declarations ---*/
__pyx_init_filenames();
/*--- Initialize various global constants etc. ---*/
if (unlikely(__Pyx_InitGlobals() < 0))
{__pyx_filename = __pyx_f[0];
__pyx_lineno = 1;
__pyx_clineno = __LINE__;
goto __pyx_L1_error;}
/*--- Module creation code ---*/
#if PY_MAJOR_VERSION < 3
__pyx_m = Py_InitModule4("helloworld", __pyx_methods, 0, 0, PYTHON_API_VERSION);
#else
__pyx_m = PyModule_Create(&__pyx_moduledef);
#endif
if (!__pyx_m)
{__pyx_filename = __pyx_f[0];
__pyx_lineno = 1; __pyx_clineno = __LINE__;
goto __pyx_L1_error;};
#if PY_MAJOR_VERSION < 3
Py_INCREF(__pyx_m);
#endif
__pyx_b = PyImport_AddModule(__Pyx_BUILTIN_MODULE_NAME);
if (!__pyx_b)
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 1;
__pyx_clineno = __LINE__; goto __pyx_L1_error;};
if (PyObject_SetAttrString(__pyx_m, "__builtins__", __pyx_b) < 0)
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 1;
__pyx_clineno = __LINE__; goto __pyx_L1_error;};
/*--- Builtin init code ---*/
if (unlikely(__Pyx_InitCachedBuiltins() < 0))
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 1;
__pyx_clineno = __LINE__; goto __pyx_L1_error;}
__pyx_skip_dispatch = 0;
/*--- Global init code ---*/
/*--- Function export code ---*/
/*--- Type init code ---*/
/*--- Type import code ---*/
/*--- Function import code ---*/
/*--- Execution code ---*/
/* "/home/nosklo/devel/ctest/hello.pyx":1
* cdef int hello(int a, int b): # <<<<<<<<<<<<<<
* return a + b
*
*/
#if PY_MAJOR_VERSION < 3
return;
#else
return __pyx_m;
#endif
__pyx_L1_error:;
__Pyx_AddTraceback("helloworld");
#if PY_MAJOR_VERSION >= 3
return NULL;
#endif
}
static const char *__pyx_filenames[] = {
"hello.pyx",
};
/* Runtime support code */
static void __pyx_init_filenames(void) {
__pyx_f = __pyx_filenames;
}
#include "compile.h"
#include "frameobject.h"
#include "traceback.h"
static void __Pyx_AddTraceback(const char *funcname) {
PyObject *py_srcfile = 0;
PyObject *py_funcname = 0;
PyObject *py_globals = 0;
PyObject *empty_string = 0;
PyCodeObject *py_code = 0;
PyFrameObject *py_frame = 0;
#if PY_MAJOR_VERSION < 3
py_srcfile = PyString_FromString(__pyx_filename);
#else
py_srcfile = PyUnicode_FromString(__pyx_filename);
#endif
if (!py_srcfile) goto bad;
if (__pyx_clineno) {
#if PY_MAJOR_VERSION < 3
py_funcname = PyString_FromFormat("%s (%s:%d)", funcname,
__pyx_cfilenm, __pyx_clineno);
#else
py_funcname = PyUnicode_FromFormat("%s (%s:%d)", funcname,
__pyx_cfilenm, __pyx_clineno);
#endif
}
else {
#if PY_MAJOR_VERSION < 3
py_funcname = PyString_FromString(funcname);
#else
py_funcname = PyUnicode_FromString(funcname);
#endif
}
if (!py_funcname) goto bad;
py_globals = PyModule_GetDict(__pyx_m);
if (!py_globals) goto bad;
#if PY_MAJOR_VERSION < 3
empty_string = PyString_FromStringAndSize("", 0);
#else
empty_string = PyBytes_FromStringAndSize("", 0);
#endif
if (!empty_string) goto bad;
py_code = PyCode_New(
0, /*int argcount,*/
#if PY_MAJOR_VERSION >= 3
0, /*int kwonlyargcount,*/
#endif
0, /*int nlocals,*/
0, /*int stacksize,*/
0, /*int flags,*/
empty_string, /*PyObject *code,*/
__pyx_empty_tuple, /*PyObject *consts,*/
__pyx_empty_tuple, /*PyObject *names,*/
__pyx_empty_tuple, /*PyObject *varnames,*/
__pyx_empty_tuple, /*PyObject *freevars,*/
__pyx_empty_tuple, /*PyObject *cellvars,*/
py_srcfile, /*PyObject *filename,*/
py_funcname, /*PyObject *name,*/
__pyx_lineno, /*int firstlineno,*/
empty_string /*PyObject *lnotab*/
);
if (!py_code) goto bad;
py_frame = PyFrame_New(
PyThreadState_GET(), /*PyThreadState *tstate,*/
py_code, /*PyCodeObject *code,*/
py_globals, /*PyObject *globals,*/
0 /*PyObject *locals*/
);
if (!py_frame) goto bad;
py_frame->f_lineno = __pyx_lineno;
PyTraceBack_Here(py_frame);
bad:
Py_XDECREF(py_srcfile);
Py_XDECREF(py_funcname);
Py_XDECREF(empty_string);
Py_XDECREF(py_code);
Py_XDECREF(py_frame);
}
/* Type Conversion Functions */
static INLINE Py_ssize_t __pyx_PyIndex_AsSsize_t(PyObject* b) {
Py_ssize_t ival;
PyObject* x = PyNumber_Index(b);
if (!x) return -1;
ival = PyInt_AsSsize_t(x);
Py_DECREF(x);
return ival;
}
static INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
if (x == Py_True) return 1;
else if (x == Py_False) return 0;
else return PyObject_IsTrue(x);
}
static INLINE PY_LONG_LONG __pyx_PyInt_AsLongLong(PyObject* x) {
if (PyInt_CheckExact(x)) {
return PyInt_AS_LONG(x);
}
else if (PyLong_CheckExact(x)) {
return PyLong_AsLongLong(x);
}
else {
PY_LONG_LONG val;
PyObject* tmp = PyNumber_Int(x); if (!tmp) return (PY_LONG_LONG)-1;
val = __pyx_PyInt_AsLongLong(tmp);
Py_DECREF(tmp);
return val;
}
}
static INLINE unsigned PY_LONG_LONG __pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
if (PyInt_CheckExact(x)) {
long val = PyInt_AS_LONG(x);
if (unlikely(val < 0)) {
PyErr_SetString(PyExc_TypeError, "Negative assignment to unsigned type.");
return (unsigned PY_LONG_LONG)-1;
}
return val;
}
else if (PyLong_CheckExact(x)) {
return PyLong_AsUnsignedLongLong(x);
}
else {
PY_LONG_LONG val;
PyObject* tmp = PyNumber_Int(x); if (!tmp) return (PY_LONG_LONG)-1;
val = __pyx_PyInt_AsUnsignedLongLong(tmp);
Py_DECREF(tmp);
return val;
}
}
static INLINE unsigned char __pyx_PyInt_unsigned_char(PyObject* x) {
if (sizeof(unsigned char) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
unsigned char val = (unsigned char)long_val;
if (unlikely((val != long_val) || (long_val < 0))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to unsigned char");
return (unsigned char)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE unsigned short __pyx_PyInt_unsigned_short(PyObject* x) {
if (sizeof(unsigned short) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
unsigned short val = (unsigned short)long_val;
if (unlikely((val != long_val) || (long_val < 0))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to unsigned short");
return (unsigned short)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE char __pyx_PyInt_char(PyObject* x) {
if (sizeof(char) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
char val = (char)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to char");
return (char)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE short __pyx_PyInt_short(PyObject* x) {
if (sizeof(short) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
short val = (short)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to short");
return (short)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE int __pyx_PyInt_int(PyObject* x) {
if (sizeof(int) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
int val = (int)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to int");
return (int)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE long __pyx_PyInt_long(PyObject* x) {
if (sizeof(long) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
long val = (long)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to long");
return (long)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE signed char __pyx_PyInt_signed_char(PyObject* x) {
if (sizeof(signed char) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
signed char val = (signed char)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to signed char");
return (signed char)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE signed short __pyx_PyInt_signed_short(PyObject* x) {
if (sizeof(signed short) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
signed short val = (signed short)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to signed short");
return (signed short)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE signed int __pyx_PyInt_signed_int(PyObject* x) {
if (sizeof(signed int) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
signed int val = (signed int)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to signed int");
return (signed int)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE signed long __pyx_PyInt_signed_long(PyObject* x) {
if (sizeof(signed long) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
signed long val = (signed long)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to signed long");
return (signed long)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
static INLINE long double __pyx_PyInt_long_double(PyObject* x) {
if (sizeof(long double) < sizeof(long)) {
long long_val = __pyx_PyInt_AsLong(x);
long double val = (long double)long_val;
if (unlikely((val != long_val))) {
PyErr_SetString(PyExc_OverflowError, "value too large to convert to long double");
return (long double)-1;
}
return val;
}
else {
return __pyx_PyInt_AsLong(x);
}
}
Sie haben Cython falsch eingegeben. Wenn Sie sich bewusst sind, wie Cython funktioniert, kann es ein sehr schneller Prozess sein, eine Python-Funktion in Cython zu konvertieren. Ich hatte 30x Beschleunigungen, die dies für nicht viel zusätzliche Anstrengung tun. –
"Mit Sicherheit werden Sie immer einen Leistungszuwachs von Hand machen" - mit modernen Tools ist das höchst unwahrscheinlich.Die Chancen, dass Sie als Programmierer einen möglichst optimalen Code schreiben (mit möglichst wenig Aufwand und Zeitaufwand) als ein Tool, das von Tausenden von Menschen geschrieben und getestet wurde, sind ziemlich dünn. Bedenken Sie, dass ich Ihre Programmierkenntnisse nicht mit dieser Aussage beleidigen möchte. – rbaleksandar