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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2791) WindowsDirectory
Date Fri, 03 Dec 2010 03:08:10 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2791:
--------------------------------

    Attachment: LUCENE-2791.patch

attached is an updated patch (fixing some indentation, adding some paranoid NPE checks in
the JNI code, various stuff like that)

I also included a crude benchmark made by mikemccand (I think we should commit this to our
tests!)

It builds a 100k doc index and searches with 20 threads for 10 seconds:
I used -Dtests.seed=0:0 and -Dtests.codec=Standard, and recorded best out of 3.
I tested win32 -client, and win64 -server, only because these are the oracle defaults.

||Directory||QPS Win32 -client||
|NIOFSDirectory|360|
|SimpleFS|372|
|WindowsDirectory|616|
|RAMDirectory|760|
|MMapDirectory|772|

||Directory||QPS Win64 -server||
|NIOFSDirectory|361|
|SimpleFS|376|
|WindowsDirectory|777|
|RAMDirectory|1105|
|MMapDirectory|1138|

So, I think this gets you past the sync issue and can be a good choice e.g. for win32
But MMap still seems to be the best for this benchmark.



> WindowsDirectory
> ----------------
>
>                 Key: LUCENE-2791
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2791
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>            Reporter: Robert Muir
>         Attachments: LUCENE-2791.patch, LUCENE-2791.patch, WindowsDirectory.dll, WindowsDirectory_amd64.dll
>
>
> We can use Windows' overlapped IO to do pread() and avoid the performance problems of
SimpleFS/NIOFSDir.

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