C Syntax

       2003-2025, The Open MPI Community

                                                  Jun 07, 2025                                MPI_T_PVAR_READ(3)

MPI_T_pvar_read  queries the value of a performance variable identified by the handle specified in handle
       in the session specified in session. The result is stored in the buffer pointed to  by  buf.  The  caller
       must ensure that the buffer pointed to by buf is large enough to hold the entire value of the performance
       variable.

MPI_T_pvar_read will fail if:

       • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

       • MPI_T_ERR_INVALID_HANDLE: The handle is invalid or not associated with the session

       • MPI_T_ERR_INVALID_SESSION: Session argument is not a valid session

       SEEALSO:

          • MPI_T_pvar_handle_alloc

          • MPI_T_pvar_get_info

          • MPI_T_pvar_session_create

       • session: Performance experiment session.

       • handle: Performance variable handle.

       • buf: Initial address of storage location for variable value.

CSyntax
          #include <mpi.h>

          int MPI_T_pvar_read(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)