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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: lucene 2.9.0RC4 slower than 2.4.1?
Date Tue, 15 Sep 2009 17:26:05 GMT
How does a conventional file system compare?

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de

> -----Original Message-----
> From: Mark Miller [mailto:markrmiller@gmail.com]
> Sent: Tuesday, September 15, 2009 7:15 PM
> To: java-user@lucene.apache.org
> Subject: Re: lucene 2.9.0RC4 slower than 2.4.1?
> 
> Mark Miller wrote:
> > Indeed - I just ran the FileReaderTest on a Linux tmpfs ramdisk - with
> > SeparateFile all 4 of my cores are immediately pinned and remain so.
> > With ChannelFile, all 4 cores hover 20-30%.
> >
> > It would appear it may not be a good idea to use NIOFSDirectory on
> ramdisks.
> >
> > Even still though - it looks like you have a further issue - your Lucene
> > 2.9 old-api results don't use it, and are still not good.
> >
> >
> The quick results:
> 
> ramdisk: sudo mount -t tmpfs tmpfs /tmp/space -o
> size=1G,nr_inodes=200k,mode=01777
> 
> config: impl=SeparateFile serial=false nThreads=4 iterations=100
> bufsize=1024 poolsize=2 filelen=730554368
> answer=-282295611, ms=173550, MB/sec=1683.7899579371938
> 
> config: impl=ChannelFile serial=false nThreads=4 iterations=100
> bufsize=1024 poolsize=2 filelen=730554368
> answer=-282295361, ms=1377768, MB/sec=212.09793463050383
> 
> 
> --
> - Mark
> 
> http://www.lucidimagination.com
> 
> 
> 
> 
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