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From oliverd <>
Subject Re: Throughput drop with NIO transport as compared to TCP transport
Date Thu, 09 Apr 2015 13:20:24 GMT
it is not only about the number of consumers, producers
the question is how many consumers, producers actively send, receive data on
a connection

standard IO means one thread serves a connection, independent of the actual
usage - even if it's idle
NIO means decoupling - a thread is allocated (from a pool) on demand (if a
request needs to be served)

if you have 1000 consumers which actively transfer data then you will have
the same number of threads compared to blocking IO

what you want is that thread count does not increase in parallel to the
connection count (as this does not scale)

I would expect a slight overhead for NIO as the thread handling adds some
overhead (but this is the price for scaling) - given that the JVM NIO
throughput is comparable to blocking IO

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