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From "Gary Tully (JIRA)" <>
Subject [jira] Created: (AMQ-1689) (NIO)DataFileAppender does to many sync or force calls when there is little or no concurrency
Date Fri, 25 Apr 2008 13:14:43 GMT
(NIO)DataFileAppender does to many sync or force calls when there is little or no concurrency

                 Key: AMQ-1689
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Message Store
    Affects Versions: 5.1.0
         Environment: Windows, NIO force and File sync perform poorly
            Reporter: Gary Tully
            Priority: Minor

Where NIO channel force and fileDescriptor.sync perform poorly and there is little concurrently,
the kaha DataFileAppender performs poorly.
A test case where a single producer and consumer operate from either ends of a networked pair
of brokers shows the problem. It takes ~3 minutes to send 1000 messages on windows!. The problem
is that 70% of the time is spent in NIO channel.flush()

The flush is batched if there are concurrent writes, but otherwise, a single write is flushed
My proposal is to have the batch processor batch till a batch is full or till a sync flag
is present in a write command or till some timeout expires or if the appender is closed.
This reduces the number of force calls and with this change, my test case can do 1000 messages
in ~1minute. 

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