Suppose that the profiler wishes to accumulate the total amount of data sent by the MPI_SEND function, along with the total elapsed time spent in the function. This could trivially be achieved thus
static int totalBytes = 0;
static double totalTime = 0.0;
int MPI_Send(void* buffer, int count, MPI_Datatype datatype,
int dest, int tag, MPI_Comm comm)
{
double tstart = MPI_Wtime(); /* Pass on all the arguments */
int extent;
int result = PMPI_Send(buffer,count,datatype,dest,tag,comm);
MPI_Type_size(datatype, &extent); /* Compute size */
totalBytes += count*extent;
totalTime += MPI_Wtime() - tstart; /* and time */
return result;
}
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