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I thought about that (specifically the use of the facilities in the nio
package), but I figured that the original request was targeted at
environments other than Java. Right now, Java's direct support for
multi-core CPUs is a little lacking (ref the parser thread from last
week or so). If it was Java, I agree, you could use the approach you
suggest.
Is the JVM really smart enough to take appropriate advantage of a
filesystem that provided the capability Sean wanted? In the perfect
world, you would have the kernel taking care of buffering/caching the
data for you so that it would be available to multiple user-process
threads, but as far as most OS's are concerned, they just see it as
another CPU. On a somewhat tangential note, there was an article in the
May IEEE Computer magazine about the issues facing OS's around these new
chips [1]. Based on what I remember reading, I don't think you'd really
notice the difference in Java on today's OS platforms.
ast
[1] http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/mags/co/&toc=comp/mags/co/2005/05/r5toc.xml&DOI=10.1109/MC.2005.160
On Sat, 2006-04-01 at 10:28, Elliotte Harold wrote:
> What about memory mapped files? If you can treat the file as an array,
> it's just as easy to move backwards through the array as forwards.
>
> For network applications you might have to have three threads: one to
> fill a buffer without parsing, one to parse from the start of the
> buffer, one to parse from the back once the buffer is fully loaded.
> Presumably the fill thread could outrun the other two.
--
Join me in Dubrovnik, Croatia on May 8-10th when I will be speaking at
InfoSeCon 2006. For more information, see www.infosecon.org.
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