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From Mark Miller <markrmil...@gmail.com>
Subject Re: lucene 2.9.0RC4 slower than 2.4.1?
Date Tue, 15 Sep 2009 17:15:30 GMT
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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