MPI_T_pvar_readreset(3) Open MPI MPI_T_pvar_readreset(3)

MPI_T_pvar_readreset - Atomically read and reset the value of a performance variable

#include <mpi.h>
int MPI_T_pvar_readreset(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)

Performance experiment session.
Performance variable handle.
Initial address of storage location for variable value.

MPI_T_pvar_readreset atomically queries and resets the value of a performance variable bound to the handle specified by handle in the session specified by session. The result is stored in the buffer pointed to by buf. This function can only be used with performance variables that are atomic and not readonly. 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_readreset() will fail if:

The MPI Tools interface not initialized
The handle is invalid or not associated with the session
Session argument is not a valid session
Variable cannot be read and written atomically
Variable cannot be reset

February 23, 2023 4.1.5