What should be done if the server reaches maximum data read speed?

If the server reaches maximum data read speed, several steps can be taken to improve the situation:

• Read code optimization: ensure that data reading is efficient, without unnecessary blocking and with buffering.
• Parallelization: use goroutines for parallel reading if possible and does not lead to data races.
• Resource increase: scale the server vertically (better hardware) or horizontally (clustering).
• Caching: to reduce the load on the data source.
• Profiling: identify bottlenecks using a profiler (pprof) and eliminate them.

Example of parallel reading using goroutines:

func readDataConcurrently(sources []io.Reader) {
    var wg sync.WaitGroup
    for _, src := range sources {
        wg.Add(1)
        go func(r io.Reader) {
            defer wg.Done()
            buf := make([]byte, 1024)
            for {
                n, err := r.Read(buf)
                if err != nil {
                    break
                }
                process(buf[:n])
            }
        }(src)
    }
    wg.Wait()
}