Developer Guide for Intel® oneAPI Math Kernel Library for Windows*
Redefining Memory Functions
In C/C++ programs, you can replace Intel® oneAPI Math Kernel Library (oneMKL) memory functions that the library uses by default with your own functions. To do this, use the memory renaming feature.
Memory Renaming
Intel® oneAPI Math Kernel Library (oneMKL) accesses the memory functions by pointers i_malloc, i_free, i_calloc , and i_realloc , which are visible at the application level. You can programmatically redefine values of these pointers to the addresses of your application’s memory management functions.
Redirecting the pointers is the only correct way to use your own set of memory management functions. If you call your own memory functions without redirecting the pointers, the memory will get managed by two independent memory management packages, which may cause unexpected memory issues.
How to Redefine Memory Functions
To redefine memory functions, use the following procedure:
If you areusing the statically linked Intel® oneAPI Math Kernel Library (oneMKL) ,
Include the i_malloc.h header file in your code. This header file contains all declarations required for replacing the memory allocation functions. The header file also describes how memory allocation can be replaced in those Intel libraries that support this feature.
Redefine values of pointers i_malloc, i_free, i_calloc , and i_realloc prior to the first call to Intel® oneAPI Math Kernel Library (oneMKL) functions, as shown in the following example:
#include "i_malloc.h"
. . .
i_malloc = my_malloc;
i_calloc = my_calloc;
i_realloc = my_realloc;
i_free = my_free;
. . .
// Now you may call Intel MKL functionsIf you are using the dynamically linked Intel® oneAPI Math Kernel Library (oneMKL) ,
Include the i_malloc.h header file in your code.
Redefine values of pointers i_malloc_dll, i_free_dll, i_calloc_dll , and i_realloc_dll prior to the first call to Intel® oneAPI Math Kernel Library (oneMKL) functions, as shown in the following example:
#include "i_malloc.h"
. . .
i_malloc_dll = my_malloc;
i_calloc_dll = my_calloc;
i_realloc_dll = my_realloc;
i_free_dll = my_free;
. . .
// Now you may call Intel MKL functions