Groups > comp.lang.java.programmer > #12290

Re: O.T. optimising file placement

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From	Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: O.T. optimising file placement
Date	Fri, 24 Feb 2012 01:49:39 +0000 (UTC)
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On Thu, 23 Feb 2012 16:39:42 -0800, Lew wrote:

> 
> I think we can all agree by now that that is not true.
>
Unlike some, I take a good deal of interest in what my machines are up 
to, so I was quoting what I see using top on my Linux systems. During 
normal operation there is very little activity on my laptop except from 
the programs I'm actively using unless, as you say, logwatch/smartd/
rkhunter/updatedb get run by atd, but on a reasonably quick machine they 
don't run for long.

Of course, the house server is a different case, since it has several 
24/7 services on it, but again its only heavy, continuous disk activity 
is overnight when it runs backups/logwatch/smartd/updatedb. Apart from 
that requests that wake up Postfix/Spamassassin/Apache/or ftpd/sshd are 
pretty sporadic and the disk LED flashes are best described as 
intermittent.

The longest continuously busy time on either machine is during backups 
and even there there precious little contention since rsync or tar+gzip 
since the only stuff being written to the disk its reading from are 
backup logs. Same applies to software update sessions. To the best of my 
knowledge (and watching top) none of yum, rpm, tar, gzip or rsync are 
multi-threaded: rsync is probably using poll() based async i/o but from 
top and observed behaviour none of the others seem to do that. In fact 
the only long-running programs on my systems that I know to be multi-
threaded are Apache, Postgres, SA and Postfix. 

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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O.T. optimising file placement Roedy Green <see_website@mindprod.com.invalid> - 2012-02-21 09:59 -0800
  Re: O.T. optimising file placement Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-02-21 18:05 -0800
  Re: O.T. optimising file placement Jeff Higgins <jeff@invalid.invalid> - 2012-02-21 21:41 -0500
    Re: O.T. optimising file placement Jeff Higgins <jeff@invalid.invalid> - 2012-02-21 23:23 -0500
      Re: O.T. optimising file placement Roedy Green <see_website@mindprod.com.invalid> - 2012-02-22 11:15 -0800
        Re: O.T. optimising file placement Jeff Higgins <jeff@invalid.invalid> - 2012-02-22 16:00 -0500
          Re: O.T. optimising file placement Jeff Higgins <jeff@invalid.invalid> - 2012-02-22 16:03 -0500
            Re: O.T. optimising file placement Gene Wirchenko <genew@ocis.net> - 2012-02-22 14:52 -0800
              Re: O.T. optimising file placement Jeff Higgins <jeff@invalid.invalid> - 2012-02-22 18:24 -0500
                Re: O.T. optimising file placement Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-02-22 17:10 -0800
                Re: O.T. optimising file placement Gene Wirchenko <genew@ocis.net> - 2012-02-22 20:02 -0800
        Re: O.T. optimising file placement Lew <noone@lewscanon.com> - 2012-02-22 14:27 -0800
          Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-23 01:31 +0000
            Re: O.T. optimising file placement Arne Vajhøj <arne@vajhoej.dk> - 2012-02-22 21:40 -0500
              Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-23 23:16 +0000
                Re: O.T. optimising file placement Patricia Shanahan <pats@acm.org> - 2012-02-23 16:22 -0800
                Re: O.T. optimising file placement Patricia Shanahan <pats@acm.org> - 2012-02-23 21:45 -0800
                Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-24 20:21 +0000
                Re: O.T. optimising file placement Arne Vajhøj <arne@vajhoej.dk> - 2012-02-24 20:31 -0500
                Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-25 13:15 +0000
            Re: O.T. optimising file placement Lew <noone@lewscanon.com> - 2012-02-23 16:39 -0800
              Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-24 01:49 +0000
                Re: O.T. optimising file placement Lew <noone@lewscanon.com> - 2012-02-24 10:50 -0800
                Re: O.T. optimising file placement Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-24 23:59 +0000
              Re: O.T. optimising file placement Arne Vajhøj <arne@vajhoej.dk> - 2012-02-24 20:25 -0500
    Re: O.T. optimising file placement Roedy Green <see_website@mindprod.com.invalid> - 2012-02-22 10:54 -0800

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