Yes, it 's obviously optimized by jit compiler of hotspot.
-- Original --
From: "Uwe Schindler";;
Date: Wed, Jul 16, 2014 05:44 PM
To: "java-user";
"'wangzhijiang999'";
Subject: RE: 答复：答复：答复：mmap confusion
il: u...@thetaphi.de
> -Original Message-
> From: wangzhijiang999 [mailto:wangzhijiang...@aliyun.com]
> Sent: Wednesday, July 16, 2014 11:39 AM
> To: java-user; Uwe Schindler
> Subject: 答复：答复：答复：mmap confusion in lucene
>
> Hi Uwe,
> Where can find the detail introductio
014 11:10 AM> To: java-user> Subject: 答复：答复：mmap confusion
in lucene> > Hi 308181687,> > I also tested in this way. If print every byte,
the OS cache will consume> the size of file at last,about 800M.> > for (int j =
0; j < len; ++j){ System.out.println(buff.get());
t; case. Lucene never does this! The idea behind mmap is to *not copy* the
> data and work on the mmapped region directly (using random access). The
> OS cache logic will then use statistics about which pages were actually used
> and keep them longer in FS cache than those used one time and
-28213
Bremenhttp://www.thetaphi.deeMail: u...@thetaphi.de> -Original
Message-> From: wangzhijiang999 [mailto:wangzhijiang...@aliyun.com]> Sent:
Monday, July 14, 2014 11:58 AM> To: java-user> Subject: mmap confusion in
lucene> > Hi everybody, I found a problem confu
-- Original --
From: "java-user@lucene.apache.org wan";;
Date: Tue, Jul 15, 2014 10:44 AM
To: "java-user";
Subject: 答复：mmap confusion in lucene
Hi Uwe,
Thank you for always help.
For my first testing I am clear of it, it is becuase the O
Bremenhttp://www.thetaphi.deeMail: u...@thetaphi.de> -Original
Message-> From: wangzhijiang999 [mailto:wangzhijiang...@aliyun.com]> Sent:
Monday, July 14, 2014 11:58 AM> To: java-user> Subject: mmap confusion in
lucene> > Hi everybody, I found a problem confused me when I tested
r-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: u...@thetaphi.de
> -Original Message-
> From: wangzhijiang999 [mailto:wangzhijiang...@aliyun.com]
> Sent: Monday, July 14, 2014 11:58 AM
> To: java-user
> Subject: mmap confusion in lucene
>
> Hi everybody,
Your code isn't doing what you think it is doing. You need to ensure
things aren't eliminated by the compiler.
On Mon, Jul 14, 2014 at 5:57 AM, wangzhijiang999
wrote:
> Hi everybody, I found a problem confused me when I tested the mmap
> feature in lucene. I tested to read a file size of
Hi everybody, I found a problem confused me when I tested the mmap
feature in lucene. I tested to read a file size of 800M by mmap method like
below:
RandomAccessFile raf = new RandomAccessFile(new File(path), "r");
FileChannel rafc = raf.getChannel();ByteBuffer buff =
rafc.map(FileCha
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