Re: Search Performance

[sergiu gordea]

Michael Celona wrote:
My index is changing in real time constantly... in this case I guess this
will not work for me.... any suggestions...
 

using a singleton pattern for the your index searcher makes sense anyway 
... I don'T think that you change
the index after each search. the computing effort is insignificant but 
the gain is.

How often do you optimize your index.
Run your jmeter tests before and after optimization!
Which is the value of your merge factor?
Try to use 2 or 3 and run the tests again.
I think it will be useful for lucene community to provide the results 
of your tests.

Best,
 Sergiu
Michael
-----Original Message-----
From: David Townsend [mailto:[EMAIL PROTECTED] 
Sent: Friday, February 18, 2005 11:50 AM
To: Lucene Users List
Subject: RE: Search Performance

IndexSearchers are thread safe, so you can use the same object on multiple
requests.  If the index is static and not constantly updating, just keep one
IndexSearcher for the life of the app.  If the index changes and you need
that instantly reflected in the results, you need to check if the index has
changed, if it has create a new cached IndexSearcher.  To check for changes
use you'll need to monitor the version number of the index obtained via
IndexReader.getCurrentVersion(Index Name)
David
-----Original Message-----
From: Stefan Groschupf [mailto:[EMAIL PROTECTED]
Sent: 18 February 2005 16:15
To: Lucene Users List
Subject: Re: Search Performance
Try a singleton pattern or an static field.
Stefan
Michael Celona wrote:
 

I am creating new IndexSearchers... how do I cache my IndexSearcher...
Michael
-----Original Message-----
From: David Townsend [mailto:[EMAIL PROTECTED] 
Sent: Friday, February 18, 2005 11:00 AM
To: Lucene Users List
Subject: RE: Search Performance

Are you creating new IndexSearchers or IndexReaders on each search?
   

Caching
 

your IndexSearchers has a dramatic effect on speed.
David Townsend
-----Original Message-----
From: Michael Celona [mailto:[EMAIL PROTECTED]
Sent: 18 February 2005 15:55
To: Lucene Users List
Subject: Search Performance
What is single handedly the best way to improve search performance?  I have
an index in the 2G range stored on the local file system of the searcher.
Under a load test of 5 simultaneous users my average search time is ~4700
ms.  Under a load test of 10 simultaneous users my average search time is
~10000 ms.    I have given the JVM 2G of memory and am a using a dual 3GHz
Zeons.  Any ideas?  


Michael
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