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

#include <mpi.h>
int MPI_T_cvar_get_num(int *num_cvar)

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num_cvar: Current number of control variables.

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.

MPI_T_cvar_get_num will fail if:

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MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

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May 30, 2025