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https://issues.apache.org/jira/browse/LUCENE-1743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731101#action_12731101
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Uwe Schindler commented on LUCENE-1743:
---------------------------------------
bq.
HighlyConcurentForWindows64WithTermDictionaryInRamAndStoredFieldsOnDiskDirectory
just for me
By the way, for MMapDirectory the MappedByteBuffer.load() method should be
somehow accesible/configureable to create this TermDictionaryInRam part
(IndexInput would call load() and tells the OS to swap as much as possible of
the mmaped file into RAM). Just an idea.
The Hyper FileSwitchDirectory was my idea yesterday, too. As Mike that, at
least the getDirectory() should be configureable.
And for some good defaults, a factory could be provided like
getUwesBestOfMMapDirectoryFor32BitOSs(File, LockFactory). What I do not like
with the current FileSwitchDir is the fact, that you must create instances with
the same Dir and LockFactory for each sub-directory (e.g. what happens if you
use 2 different LockFactories on the same physical dir inside a
FileSwitchDir?). Maybe the FileSwitchDirectory could just get the File and
LockFactory once and creates the instances? Many ideas...
> MMapDirectory should only mmap large files, small files should be opened
> using SimpleFS/NIOFS
> ---------------------------------------------------------------------------------------------
>
> Key: LUCENE-1743
> URL: https://issues.apache.org/jira/browse/LUCENE-1743
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 3.1
>
>
> This is a followup to LUCENE-1741:
> Javadocs state (in FileChannel#map): "For most operating systems, mapping a
> file into memory is more expensive than reading or writing a few tens of
> kilobytes of data via the usual read and write methods. From the standpoint
> of performance it is generally only worth mapping relatively large files into
> memory."
> MMapDirectory should get a user-configureable size parameter that is a lower
> limit for mmapping files. All files with a size<limit should be opened using
> a conventional IndexInput from SimpleFS or NIO (another configuration option
> for the fallback?).
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