Intel® Math Kernel Library 2018 Developer Reference - C

DFTI_NUMBER_OF_TRANSFORMS

If you need to perform a large number of identical FFTs, you can do this in a single call to a DftiCompute* function with the value of the DFTI_NUMBER_OF_TRANSFORMS configuration parameter equal to the actual number of the transforms. The default value of this parameter is one. You can set this parameter to a positive integer value using the MKL_LONG data type. When setting the number of transforms to a value greater than one, you also need to specify the distance between the input and output data sets using one of the DFTI_INPUT_DISTANCE and DFTI_OUTPUT_DISTANCE configuration parameters or both.

Important

To better understand usage of the DFTI_NUMBER_OF_TRANSFORMS configuration parameter, refer to the following example in your Intel MKL directory:

config_number_of_transforms.c

See Also