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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: How to use lucene for high search performance ?
Date Mon, 28 Jul 2008 09:19:43 GMT

Yes you can, and that should be fast.

Another thing to try is an SSD -- look at the "Lucene performance  
issues" thread on java-user.

Mike

On Jul 27, 2008, at 11:54 PM, 王建新 wrote:

> Thanks a lot.
>
> I have an idea, Can I use lucene on a 64bits VM?
> In the condition, I can load all index files to ram. Then no io  
> operation, I can execute concurrent search in thread pool.
>
> Its performance will be better?
>
>
>
> ----- Original Message -----
> From: "Michael McCandless" <lucene@mikemccandless.com>
> To: <general@lucene.apache.org>
> Cc: <java-user@lucene.apache.org>
> Sent: Saturday, July 26, 2008 4:59 AM
> Subject: Re: How to use lucene for high search performance ?
>
>
>
> Let's move this thread to java-user (CC'd).
>
> 王建新 wrote:
>
>> Thank you.
>>
>> If the index files are very big(10G), I cannot load them to ram in
>> one process.
>
> Ahh OK.
>
>> Shoud I use MutilSearcher to load index files with serval processes?
>> How about its performance?
>
> MultiSearcher alone doesn't really scale up -- it just lets you
> combine the results of many Searchables.
>
> Maybe you mean ParallelMlultiSearcher?  That class uses a separate
> thread to search each Searchable, so if you are on a multi core/cpu
> machine that should give a net reduction in latency of each search
> (though I don't have any experience here!).
>
>> by the way, I think only .frq and .tis files need to load in ram.
>> And it can save some ram.
>
> You mean you don't use any positions information?  Really the OS
> should do the right thing for you -- it should only cache into its IO
> cache those files that you actually use after which searches should be
> fast.
>
> Mike
>
>>
>> roy
>>
>> ----- Original Message -----
>> From: "Michael McCandless" <lucene@mikemccandless.com>
>> To: <general@lucene.apache.org>
>> Sent: Thursday, July 24, 2008 6:09 PM
>> Subject: Re: How to use lucene for high search performance ?
>>
>>
>>
>> Try InstantiatedIndexWriter/Reader (under contrib/instantiated)?
>>
>> It consumes more RAM than the RAMDirectory approach, but is faster
>> performance.
>>
>> Mike
>>
>> PS -- this sort of question should go to java-user in the future.
>>
>> 王建新 wrote:
>>
>>>
>>> Hi,
>>>  If I use lucene to execute many search requests at one time, the
>>> io operation will be the bottleneck of the performance.
>>>  So I use RAMDirectory to avoid io operation.
>>>  But I found RAMDirectory cannot raise the performance much if the
>>> index is big( about 1.2G).
>>>  Could anyone give me any advice to raise the performance for
>>> concurrent search operation?
>>>  Thanks.
>>>
>>> roy


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