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From Murat Yakici <>
Subject Re: Nio File Caching & Performance Test
Date Tue, 16 May 2006 06:55:09 GMT

According to my humble tests, there is no significant improvement 
either. NIO has buffer creation time costs compared to other Buffered 
IOs. However, a testbed would be ideal for benchmarks.


Doug Cutting wrote:

> Robert Engels wrote:
>> The most important statistic is that the reading via the local cache, vs.
>> going to the OS (where the block is cached) is 3x faster (22344 vs. 
>> 68578).
>> With random reads, when the block may not be in the OS cache, it is 8x
>> faster (72766 vs. 586391).
> [ ... ]
>> This test only demonstrates improvements in the low-level IO layer, 
>> but one
>> could infer significant performance improvements for common searches 
>> and/or
>> document retrievals.
> That is not an inference I would make.  There should be some 
> improvement, but whether it is significant is not clear to me.
>> Is there a standard Lucene search performance I could run both with and
>> without the NioFSDirectory to demonstrate real world performance
>> improvements? I have some internal tests that I am collating, but I would
>> rather use a standard test if possible.
> No, we don't have a standard benchmark suite.  Folks have talked about 
> developing one, but I don't think one yet exists.
> Report what you have.  Describe the collection, how it is indexed, how 
> you've selected queries, and the improvement in average response time.
> Doug
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