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From: qwertmonkey@syberiaoutpost.ru
Newsgroups: comp.lang.java.programmer
Subject: How can you make idle processors pick up java work?
Date: Mon, 30 Jul 2012 23:27:39 +0000 (UTC)
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>> Is there a way to make these processors pick up/share work also, or
>> do you have to use some sort of scheduling framework on top of java?

> Use multiple threads?
~
 a) I need to actually scan large text files (10+ million lines).
 b) On each line there is a NL sentence.
 c) That processing should be run only once, but as fast as possible.
~
 d) If you go:
 d.1) int iPrx = Runtime.getRuntime().availableProcessors();
 d.2) count all lines
 d.3) split the file in (total lines)/iPrx
 d.4) then run iPrx threads (or executable instances using a batch script)
 the time you waste on d.2) and d.3) will make all that strat senseless
~
 I have no way to influence how those large files are generated
~
 e) because of the large sizes of the files you can't even go
~
 FIS = new FileInputStream(IFl);
 FileChannel IFlChnl = FIS.getChannel();
 int iChnlSz = (int)IFlChnl.size();
 MappedByteBuffer MptBytBfr = IFlChnl.map(FileChannel.MapMode.READ_ONLY, 0, iChnlSz);
~
 so, apparently, the only option I have is:
~
     BfR = Files.newBufferedReader(DirPth, ChrStUTF8);
     String aSx = BfR.readLine();
     while(aSx != null){ 

      aSx = BfR.readLine();
     }
~
 do you know of a faster way to go about this?
~
 lbrtchx