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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-475) RAMDirectory(Directory dir, boolean closeDir) constructor uses memory inefficiently.
Date Thu, 01 Dec 2005 23:17:30 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-475?page=comments#action_12359097 ] 

Hoss Man commented on LUCENE-475:
---------------------------------

Using different buffer sizes may not make a big difference in your performacne tests -- but
that doesn't mean it won't mke a differnece for other people running with different heap sizees,
or on different hardware.  

As i understand it, the point of this patch is to give people the ability to use memory more
efficiently,  and I applaud that -- but why not go all out and let users control he buffer
size so they can tune it to their hearts content?

>  RAMDirectory(Directory dir, boolean closeDir)  constructor uses memory inefficiently.
> --------------------------------------------------------------------------------------
>
>          Key: LUCENE-475
>          URL: http://issues.apache.org/jira/browse/LUCENE-475
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Store
>     Reporter: Volodymyr Bychkoviak
>  Attachments: RamDirectory.diff
>
> recently I found that  RAMDirectory(Directory dir, boolean closeDir)  constructor uses
memory inefficiently.
> files from source index are read entirely intro memory as single byte array which is
after all is thrown away. And if I want to load my 200M optimized, compound format index to
memory for faster search I should give JVM at least 400Mb memory limit. For larger indexes
this can be an issue.
> I've attached patch how to solve this problem.

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