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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5488) [classlib][nio] Scatter/gather calls should use OS functionality
Date Mon, 11 Feb 2008 13:55:07 GMT
[classlib][nio] Scatter/gather calls should use OS functionality
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                 Key: HARMONY-5488
                 URL: https://issues.apache.org/jira/browse/HARMONY-5488
             Project: Harmony
          Issue Type: Improvement
          Components: Classlib
            Reporter: Tim Ellison


I just noticed that our NIO implementation of scatter / gather calls (e.g. o.a.h.nio.internal.SocketChannelImpl#write(ByteBuffer[],int,int))
are actually copying the data into a single Java heap buffer before calling the OS! :-(  and
FileChannelImpl copies into a single direct byte buffer.

These need to be reimplemented in terms of the OS scatter/gather capabilities to avoid copying.


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