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From Srikant Jakilinki <>
Subject Re: Solid State Drives vs. RAMDirectory
Date Thu, 13 Mar 2008 11:58:56 GMT
Hi Toke,

Thanks for the write-up. Speaking for the community, the graphs (as 
earlier) would be great.

There is no benchmarks page on the Wiki. There is one on the main site 
to which you can add your stuff -
Maybe one should create one on the wiki - not exactly called benchmarks 
but titled as performance studies/findings or something similar to that.

BTW, guys, I am slowly going into testing performance on multi-disks on 
multi-core machines (one indexer/searcher/index per disk). Initial 
results are encouraging. If anyone has some pointers or done something 
similar, it would be great.


Toke Eskildsen wrote:
> Time for another dose of inspiration for investigating Solid State
> Drives. And no, I don't get percentages from the chip manufacturers :-)
> This time I'll argue that there's little gain in using a RAMDirectory
> over SSDs, when performing searches. At least for our setting.
> [...]
> Grand conclusion? Getting 3/4 of the performance of RAMDirectory by
> using SSDs on a machine with much less RAM seems like a good deal if
> high performance / machine is needed.
> Remember, this is all searches with an optimized index. This is on the
> corpus from the Danish State and University Library and should be seen
> as nothing else than inspiration.
> Still pending is experiments with updating large indexes on SSDs. My
> guess is that there won't be anywhere near the same speed-increase as
> for the pure searches. It'll have to wait a bit though, as it requires
> Real Work, as opposed to just starting a script.
> NB: I'd like to post my findings on the Lucene wiki, but I have been
> unable to locate the appropriate page. Could someone please point me in
> the right direction?

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