Function aggregate_bench_results 

pub fn aggregate_bench_results<'a, Client: 'a, Aggregator>(
    results: BenchResult<Cluster<'a, Client>>,
    aggregator: &Process<'a, Aggregator>,
    output_interval_millis: u64,
) -> BenchResult<Process<'a, Aggregator>>

Returns transaction throughput and latency results. Aggregates results from clients and outputs every output_interval_millis.

Note: Inconsistent windowing may result in unexpected outputs unless output_interval_millis >> interval_millis.