[jboss-jira] [JBoss JIRA] Created: (JGRP-457) Optimization: make threads return immediately if NAKACK has another active thread for the same sender

[Bela Ban (JIRA)]

Optimization: make threads return immediately if NAKACK has another active thread for the same sender
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                 Key: JGRP-457
                 URL: http://jira.jboss.com/jira/browse/JGRP-457
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
         Assigned To: Bela Ban
            Priority: Minor
             Fix For: 2.5


In NAKACK, when a thread places a message for sender S into the NakReceiverWindow NRW, it subsequently acquires a lock on NRW (lock by sender) and removes as many messages as possible and passes them up.
If many threads do this at the same time, all threads but one are blocked, and - when finally unblocked - usually return. This causes context switches and possibly cache flushing, so a better way would be to have the threads check whether another thread is already removing messages using a CAS operation *before* acquiring the lock.
The effect should be that no threads will wait on the lock unnecessarily, and thus fewer context switches, and more threads available to the pool.

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