Minimizing Java Thread Context Switching Overhead?

The "acceptable delay" entirely depends on your application. Dealing with everything on the same thread can indeed help if you've got very strict latency requirements. Fortunately most applications don't have requirements quite that strict.

50us sounds somewhat high for a handoff, IME (Solaris 10/Opteron) LBQ is typically in the 30-35us range while LTQ (LinkedTransferQueue) is about 5us faster than that. As stated in the other replies SynchronousQueue may tend to be slightly slower because the offer doesn't return until the other thread has taken.

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