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Hi: We are using Java for a multi thread application. We found bottleneck at Java I/O. Has functional programming, scala for example, had better I/O throughput? We will have many cores cpu, in that sense, business logic could be handled very fast, but I/O would be a bottleneck. Are there any good solution?
Since Scala runs on the Java Virtual Machine, and (under the hood) uses the Java API for I/O, switching to scala is unlikely to offer better performance than well written Java code.
As for solutions, your description of the problem is far too sketchy to recommend particular solutions.