:ref:`MPI_T_pvar_get_num` |mdash| Query the number of performance variables
#include <mpi.h>
int MPI_T_pvar_get_num(int *num_pvar)
num_pvar
: Current number of performance variables.
:ref:`MPI_T_pvar_get_num` can be used to query the current number of performance variables. The number of performance variables may increase throughout the execution of the process but will never decrease.
:ref:`MPI_T_pvar_get_num` will fail if:
MPI_T_ERR_NOT_INITIALIZED
: The MPI Tools interface not initialized