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From "Spencer, Dave" <d...@lumos.com>
Subject RE: Disk I/O in Lucene
Date Wed, 10 Apr 2002 17:26:17 GMT
Somewhat obvious caution: don't assume the NIO (well I guess you
mean memory mapped i/o) code will be faster - some isolation testing
I did in release candidates of jdk1.4 showed it to be *slower* than
normal file i/o. No doubt it should be faster.

Note: can't find bug report I submitted to javasoft but there are other
reports
that seem to indicate that this is fixed.

-----Original Message-----
From: Donglin Lu [mailto:qlv@yahoo.com]
Sent: Wednesday, April 10, 2002 12:23 AM
To: lucene-dev@jakarta.apache.org
Subject: Re: Disk I/O in Lucene



Hi, Peter.

Thanks for the information. I am curious why Lucene
doesn't use the NIO API of JDK 1.4. It may improve the
performance.

I have not tried the RAM Directory yet.

Alex

----- Original Message ----- 
From: "Peter Carlson" <carlson@bookandhammer.com>
To: "Lucene Developers List"
<lucene-dev@jakarta.apache.org>; "Lucene Users List"
<lucene-user@jakarta.apache.org>
Sent: Tuesday, April 09, 2002 7:08 PM
Subject: Re: Disk I/O in Lucene


> Hi,
> 
> Lucene does not use the new nio API's in 1.4 (in
fact it is compatible back
> to 1.1.8).
> 
> What kind of bench marks are you looking for? I am
currently searching over
> 100K documents in about .015 seconds for a simple
query on a Sun Netra T1
> (450 Mhz).
> 
> If you have a real need for speed, Lucene also
supports a RAM Directory to
> store the index. I have not used this, but heard
it's faster.
> 
> --Peter
> 
> 
> On 4/9/02 2:41 PM, "Donglin Lu" <qlv@yahoo.com>
wrote:
> 
> > 
> > Hi, I am newbie to Lucene and have a question
about
> > Lucene's disk I/O.
> > 
> > For JDK 1.4 has java.nio APIs, does Lucene use
this
> > new I/O library to improve the disk I/O
performance?
> > Are they any benchmark about the performance of
> > Lucene?
> > 
> > Thanks.
> > 
> > Alex
> > 
> > __________________________________________________
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