[jboss-jira] [JBoss JIRA] (JGRP-1601) TP: message bundling based on count per dest rather than global count

[Bela Ban (JIRA)]

Bela Ban created JGRP-1601:
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             Summary: TP: message bundling based on count per dest rather than global count
                 Key: JGRP-1601
                 URL: https://issues.jboss.org/browse/JGRP-1601
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.3


Currently, the message bundlers in TP count accumulated message sizes based on a global 'count' variable. So both multicast messages, and messages to A, B and C increment count.

If we only sent a message bundle to destination T if (1) there are no more messages in the queue or (2) the accumulated bytes for T would exceed max_bundle_size, then we might send more batches and fewer individual messages.

Example:
* We're sending 10K messages and max_bundle_size=55K
* Different threads concurrently send
** T1: 6 multicast messages
** T2: 6 messages to A
** T3: 6 messages to B
** T4: 6 messages to C
** T5: 6 messages to D
** T6: 6 messages to E
* If each of the threads gets 1 message in, we've reached the max_bundle_size and will send a message bundle for the multicast, 1 bundle for the unicast message to A, 1 for the message to B and so on, for a total of 5 bundles with *one* message only !
* If we counted bytes per destination, we'd be able to send a bundle of 5 messages to the multicast dest, 5 to A, 5 to B and so on.
** This might lead to better performance, as message batches on the receivers tend to be filled better, especially if we have many messages being sent concurrently.

Investigate whether it would make sense (perf-wise) to have count being associated with individual destinations rather than having a global count variable.

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