Article View: comp.lang.misc
Article #1505Re: Query
From: Steven Ericsson Zenith
Date: Wed, 15 Aug 1990 15:37
Date: Wed, 15 Aug 1990 15:37
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In article <126800007@.Prime.COM>, EAF@.Prime.COM writes: |> |> It depends on the way in which your computer buffers data. Many computers |> double buffer data. That is they read it in as disk blocks and keep it |> in main memory. When you ask for the next sentence, they get it from the |> block of memory which contains the whole disk block, avoiding I/O. What you describe here isn't "double buffering", it's just plain old "buffering". "Double buffering", as I understand it, enables data to be read and written concurrently - that is, whilst one buffer is being read another can be filled. Useful if you want to keep your DMA engines busy. Thus far from avoiding I/O it allows computation and I/O to overlap. -- Steven Ericsson Zenith * email: zenith@cs.yale.edu Fax: (203) 466 2768 | voice: (203) 432 1278 "The tower should warn the people not to believe in it." - P.D.Ouspensky Yale University Dept of Computer Science 51 Prospect St New Haven CT 06520 USA
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!yale!quasi-eli!cs.yale.edu!zenith-steven From: zenith-steven@cs.yale.edu (Steven Ericsson Zenith) Newsgroups: comp.lang.misc Subject: Re: Query Message-ID: <1990Aug15.113729@cs.yale.edu> Date: 15 Aug 90 15:37:29 GMT References: <5754@uwm.edu> <126800007@.Prime.COM> Sender: news@cs.yale.edu Reply-To: zenith-steven@cs.yale.edu (Steven Ericsson Zenith) Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158 Lines: 18 Nntp-Posting-Host: king.systemsy.cs.yale.edu