[jira] Commented: (LUCENE-1121) Use nio.transferTo when copying large blocks of bytes

[Mark Miller (JIRA)]

    [ 
https://issues.apache.org/jira/browse/LUCENE-1121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561886#action_12561886
 ] 

Mark Miller commented on LUCENE-1121:
-------------------------------------

Here are some more results from a windows xp and server 2003 machine. This is 
with java 1.6. 

  Windows 2003 R2 - internal sata drive
  
  D:\>java Test 50
  create 500 MB file... 28625 msec
  transferTo... 17656 msec
  create 500 MB file... 13390 msec
  buffer... 8391 msec
  SLOWER 110.416%
  
  D:\>java Test 50
  create 500 MB file... 14141 msec
  transferTo... 8765 msec
  create 500 MB file... 13531 msec
  buffer... 1531 msec
  SLOWER 472.502%
  
  D:\>java Test 50
  create 500 MB file... 13578 msec
  transferTo... 9282 msec
  create 500 MB file... 13391 msec
  buffer... 1235 msec
  SLOWER 651.579%
  

  Windows XP SP2 - laptop drive
  
  D:\>java Test 50
  create 500 MB file... 18737 msec
  transferTo... 28239 msec
  create 500 MB file... 19113 msec
  buffer... 65839 msec
  FASTER 57.109%

  D:\>java Test 50
  create 500 MB file... 21785 msec
  transferTo... 24801 msec
  create 500 MB file... 17940 msec
  buffer... 33615 msec
  FASTER 26.22%

  D:\>java Test 50
  create 500 MB file... 22520 msec
  transferTo... 24300 msec
  create 500 MB file... 19644 msec
  buffer... 34349 msec
  FASTER 29.256%

> 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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