Support Functions

Developer Reference for Intel® oneAPI Math Kernel Library for C

Download PDF

ID 766684

Date 4/28/2026

Version

Public

Support Functions

Intel® oneAPI Math Kernel Library (oneMKL) support functions are subdivided into the following groups according to their purpose:

The following table lists the Intel® oneMKL support functions.

Function Name	Operation
Version Information
mkl_get_version	Returns the Intel® oneMKL version.
mkl_get_version_string	Returns the Intel® oneMKL version in a character string.
Threading Control
mkl_set_num_threads	Specifies the number of OpenMP* threads to use.
mkl_domain_set_num_threads	Specifies the number of OpenMP* threads for a particular function domain.
mkl_set_num_threads_local	Specifies the number of OpenMP* threads for all Intel® oneMKL functions on the current execution thread.
mkl_set_dynamic	Enables Intel® oneMKL to dynamically change the number of OpenMP* threads.
mkl_get_max_threads	Gets the number of OpenMP* threads targeted for parallelism.
mkl_domain_get_max_threads	Gets the number of OpenMP* threads targeted for parallelism for a particular function domain.
mkl_get_dynamic	Determines whether Intel® oneMKL is enabled to dynamically change the number of OpenMP* threads.
mkl_set_num_stripes	Specifies the number of partitions along the leading dimension of the output matrix for parallel `?GEMM` functions.
mkl_get_num_stripes	Gets the number of partitions along the leading dimension of the output matrix for parallel `?GEMM` functions.
Error Handling
xerbla	Error handling function called by BLAS, LAPACK, Vector Math, and Vector Statistics functions.
pxerbla	Handles error conditions for the ScaLAPACK routines.
LAPACKE_xerbla	Error handling function called by the C interface to LAPACK functions.
mkl_set_exit_handler	Sets the custom handler of fatal errors.
Character Equality Testing
lsame	Tests two characters for equality regardless of the case.
lsamen	Tests two character strings for equality regardless of the case.
Timing
second/dsecnd	Returns elapsed time in seconds. Use to estimate real time between two calls to this function.
mkl_get_cpu_clocks	Returns elapsed CPU clocks.
mkl_get_cpu_frequency	Returns CPU frequency value in GHz.
mkl_get_max_cpu_frequency	Returns the maximum CPU frequency value in GHz.
mkl_get_clocks_frequency	Returns the frequency value in GHz based on constant-rate Time Stamp Counter.
Memory Management
mkl_free_buffers	Frees unused memory allocated by the Intel® oneMKL Memory Allocator.
mkl_thread_free_buffers	Frees unused memory allocated by the Intel® oneMKL Memory Allocator in the current thread.
mkl_mem_stat	Reports the status of the Intel® oneMKL Memory Allocator.
mkl_peak_mem_usage	Reports the peak memory allocated by the Intel® oneMKL Memory Allocator.
mkl_disable_fast_mm	Turns off the Intel® oneMKL Memory Allocator for Intel® oneMKL functions to directly use the system `malloc` / `free` functions.
mkl_malloc	Allocates an aligned memory buffer.
mkl_calloc	Allocates and initializes an aligned memory buffer.
mkl_realloc	Changes the size of memory buffer allocated by `mkl_malloc` / `mkl_calloc` .
mkl_free	Frees the aligned memory buffer allocated by `mkl_malloc` / `mkl_calloc` .
mkl_set_memory_limit	On Linux, sets the limit of memory that Intel® oneMKL can allocate for a specified type of memory.
Single Dynamic Library (SDL) Control
mkl_set_interface_layer	Sets the interface layer for Intel® oneMKL at run time.
mkl_set_threading_layer	Sets the threading layer for Intel® oneMKL at run time.
mkl_set_xerbla	Replaces the error handling routine. Use with the Single Dynamic Library .
mkl_set_progress	Replaces the progress information routine.
mkl_set_pardiso_pivot	Replaces the routine handling Intel® oneMKL PARDISO pivots with a user-defined routine. Use with the Single Dynamic Library (SDL).
Conditional Numerical Reproducibility (CNR) Control
mkl_cbwr_set	Configures the CNR mode of Intel® oneMKL. The mkl_cbwr_set function must be called only once, before any other Intel® oneMKL functions.
mkl_cbwr_get	Returns the current CNR settings.
mkl_cbwr_get_auto_branch	Automatically detects the CNR code branch for your platform.
Miscellaneous
mkl_progress	Provides progress information.
mkl_enable_instructions	Enables or disables specific CPU instruction code branches for Intel® oneMKL functions.
mkl_set_env_mode	Set up the mode that ignores environment settings specific to Intel® oneMKL .
mkl_verbose	Enable or disable Intel® oneMKL Verbose mode.
mkl_verbose_output_file	Write output in Intel® oneMKL Verbose mode to a file.
mkl_set_mpi	Sets the implementation of the message-passing interface to be used by Intel® oneMKL .
mkl_finalize	Terminates Intel® oneMKL execution environment and frees resources allocated by the library.

Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex . Notice revision #20201201

Product and Performance Information

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex .

Notice revision #20201201

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for C

Support Functions