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https://issues.apache.org/jira/browse/LUCENE-1121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585677#action_12585677
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Raghu Angadi commented on LUCENE-1121:
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Only savings I would expect from transferTo() would be CPU reduction. Does the
benchmark above measure wall clock time or "cpu time"? Btw, the windows results
are pretty... strange.
HADOOP-3164 shows expected CPU benefit. Still need to do more extensive tests
where I max out CPU with and without patch and compare the wall clock time.
Initial test just compares cpu reported on /proc/pid/stat with a test that is
disk bound.
> Use nio.transferTo when copying large blocks of bytes
> -----------------------------------------------------
>
> Key: LUCENE-1121
> URL: https://issues.apache.org/jira/browse/LUCENE-1121
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-1121.patch, LUCENE-1121.patch, testIO.java
>
>
> When building a CFS file, and also when merging stored fields (and
> term vectors, with LUCENE-1120), we copy large blocks of bytes at
> once.
> We currently do this with an intermediate buffer.
> But, nio.transferTo should be somewhat faster on OS's that offer low
> level IO APIs for moving blocks of bytes between files.
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