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From "Karthik N S" <>
Subject Multi + Parallel
Date Thu, 14 Oct 2004 11:42:55 GMT


  Can somebody provide me Approximate answers   [ Which is Better choice ]
  A search of  10,000 subindexes using  multisearcher


 a search on  One Single Merged Index [ merged 10,000 Sub indexes ]

a) SubIndexes  10,000 ( <  future)

b) Field to be searche upon   = 4

c)Field type present in Indexed format = 15 

d)  RAM = 1GB

 e) O/s Linux [ Clustered Enviournament] 

 f) Processor make AMD [Probably High End]

 g) WebServer Tomcat 5.0.x  

  1)Which would be Faster ???;   

  2)If not What is may be the Probable Solution.


-----Original Message-----
From: Erik Hatcher []
Sent: Wednesday, October 13, 2004 3:53 PM
To: Lucene Users List
Subject: Re: Multi + Parallel 

On Oct 13, 2004, at 3:14 AM, Karthik N S wrote:
> I was Curious to Know the Difference between ParallelMultiSearcher  and
> MultiSearcher ,
> 1) Is the working internal functionality of these  are  same or 
> different .

They are different internally.  Externally they should return identical 
results and not appear different at all.

Internally, ParallelMultiSearcher searches each index in a separate 
thread (searches wait until all threads finish before returning).   In 
MultiSearcher, each index is searched serially.

You will not likely see a benefit to using ParallelMultiSearcher unless 
your environment is specialized to accommodate multi-threading 
(multiple CPU's, indexes on separate drives that can operate 
independently, etc).

> 2) In terms of time domain do these differ when searching same no of  
> fields
> / words .
> 3)What are the features used on each of  API.

There is no external difference to using either implementation.  
Benchmark searches using both and see what is best, but generally 
MultiSeacher will be better in most environments as it avoids the 
overhead of starting up and managing multiple threads.


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