Groups > comp.lang.java.programmer > #16785

Re: How can you make idle processors pick up java work?

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From	"David Lamb" <david.lamb@1:261/38.remove-dpk-this>
Subject	Re: How can you make idle processors pick up java work?
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  To: qwertmonkey
From: David Lamb <dalamb@cs.queensu.ca>

On 30/07/2012 7:27 PM, qwertmonkey@syberiaoutpost.ru wrote:
>>> 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

How slow is the NL processing? Does it make any sense to read lines in one 
thread and pass each off to one of the iPrx-1 other threads that might run on 
separate processors?

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Thread

How can you make idle processors pick up java work? "qwertmonkey" <qwertmonkey@1:261/38.remove-dpk-this> - 2012-07-31 18:02 +0000
  Re: How can you make idle processors pick up java work? "David Lamb" <david.lamb@1:261/38.remove-dpk-this> - 2012-07-31 18:02 +0000
  Re: How can you make idle processors pick up java work? "Patricia Shanahan" <patricia.shanahan@1:261/38.remove-dpk-this> - 2012-07-31 18:02 +0000
  Re: How can you make idle processors pick up java work? "Joshua Cranmer" <joshua.cranmer@1:261/38.remove-dpk-this> - 2012-07-31 18:02 +0000
  Re: How can you make idle processors pick up java work? "John B. Matthews" <john.b..matthews@1:261/38.remove-dpk-this> - 2012-07-31 18:02 +0000

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