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nio multi thread client performance

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I've a java program to manage servers (in fact gauges) by tcp/ip.
There is a thread per connection. I used nio and non-blocking mode
There is requirements that requests (about 50 bytes) should be send to
server i.e. every 20ms - 1s.
I tested performance with one connection and found response time
sometimes fluctuate from from 10ms to 500ms.

Any help welcome (i.e. tcp/ip send and receive buffer size or other

I found java realtime source packages signed by ibm
- can it be useful for me (seems it replaces gc and scheduler)
- what about license in commercial project (there is no licence)
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