Otis Gospodnetic wrote:
Hi,
I'm wondering if anyone has tested Lucene indexing/search performance with
different file system block sizes?
I just realized one of the servers where I run a lot of Lucene indexing and
searching has an FS with blocks of only 1K in size (typically they are 4k or
8k, I believe), so I started wondering what's better for Lucene - smaller or
larger blocks? I have a feeling 1K is too small, although I don't know enough
to back up this feeling. :(
On my system (dual Xeon with a couple 120GB S-ATA drives (not RAIDed), running
Fedora Core 3) I changed BUFFER_SIZE in storage/OutputStream.java to 4096,
achieving about 30% better performance in indexing. The search improvement
was smaller, enough smaller that it was on order what I thought my measurement
error was. I tried values up to 64K, but there wasn't much change on my
system after 4K.
--MDC
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