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https://issues.jboss.org/browse/JGRP-1989?page=com.atlassian.jira.plugin....
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Dan Berindei commented on JGRP-1989:
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[~sannegrinovero], I was just replying to your assertion that 16 bytes is a negligible
overhead compared to the buffer size. That's definitely not true in your example of
2-15 byte values, where a {{Buffer}} instance to keep track of off-heap memory is going to
be just as big as the original {{byte[]}}.
Bundlers: reuse send buffer when transport == sync.
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Key: JGRP-1989
URL:
https://issues.jboss.org/browse/JGRP-1989
Project: JGroups
Issue Type: Enhancement
Reporter: Bela Ban
Assignee: Bela Ban
Fix For: 3.6.7
With the addition of {{TCP_NIO2}}, all bundlers now create new send buffers for every
message (or message list). This generates a lot of memory allocations, perhaps it is
better to revert this change for *synchronous transports* such as {{UDP}} and {{TCP}}, and
still create new buffers for *asynchronous transports* such as {{TCP_NIO2}}.
Synchronous transports guarantee a message has been put on the wire when {{TP.send()}}
returns, whereas asynchronous transports may only have completed a partial write (so we
cannot reuse the buffer).
The code in the bundler should check for this, and copy if async or not copy if sync.
Whether or not a transport is sync is determined by a new abstract method that needs to
be overridden by every transport.
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