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From "Mark Miller (JIRA)" <>
Subject [jira] Commented: (LUCENE-1121) Use nio.transferTo when copying large blocks of bytes
Date Thu, 08 Oct 2009 17:16:31 GMT


Mark Miller commented on LUCENE-1121:

NM - it appears that when you chunk, you lose the CPU win - and when you don't chunk, you
get the win, but it performs nasty after other java io operations. Bummer.

> Use nio.transferTo when copying large blocks of bytes
> -----------------------------------------------------
>                 Key: LUCENE-1121
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>         Attachments: LUCENE-1121.patch, LUCENE-1121.patch,
> 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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