MPI_T_CVAR_GET_NUM(3)				     Open MPI				     MPI_T_CVAR_GET_NUM(3)

MPI_T_cvar_get_num — Query the number of control variables

SYNTAX
   C Syntax
	  #include <mpi.h>

	  int MPI_T_cvar_get_num(int *num_cvar)

OUTPUT PARAMETERS
       • num_cvar: Current number of control variables.

DESCRIPTION
       MPI_T_cvar_get_num  can	be  used  to  query the current number of control variables. The number of control
       variables may increase throughout the execution of the process but will never decrease.

ERRORS
       MPI_T_cvar_get_num will fail if:

       • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

Copyright
       2003-2026, The Open MPI Community

						   Mar 05, 2026				     MPI_T_CVAR_GET_NUM(3)
