Re: Architectural implications of locate mode I/O

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Sujet : Re: Architectural implications of locate mode I/O
De : sfuld (at) *nospam* alumni.cmu.edu.invalid (Stephen Fuld)
Groupes : comp.arch
Date : 01. Aug 2024, 06:20:44
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Organisation : A noiseless patient Spider
Message-ID : <v8f5vc$1lec1$1@dont-email.me>
References : 1 2 3 4 5 6
User-Agent : Mozilla Thunderbird
On 7/31/2024 6:41 PM, Lawrence D'Oliveiro wrote:
On Sat, 6 Jul 2024 06:15:56 -0000 (UTC), Stephen Fuld wrote:
 
As you posted below, the whole PDS search stuff could easily be a
disaster.  Even with moremodest sized PDSs, it was inefficient has
hell.
 Would locate mode have helped with this?
No.  The problem was that the PDS search was a linear search of records on the disk drive i.e. typically multiple disk revolutions), and furthermore, it required (until the fast PDS search came along) that the host channel take action on each disk record checked, even the ones that didn't match, including resending the search argument to the disk controller.
This has nothing to do with locate mode.
--
  - Stephen Fuld
(e-mail address disguised to prevent spam)

Date Sujet#  Auteur
5 Jul 24 * Re: Architectural implications of locate mode I/O24Joe Pfeiffer
5 Jul 24 +* Re: Architectural implications of locate mode I/O21John Levine
6 Jul 24 i+* Re: Architectural implications of locate mode I/O18Lynn Wheeler
6 Jul 24 ii+- Re: Architectural implications of locate mode I/O1MitchAlsup1
6 Jul 24 ii+* Re: Architectural implications of locate mode I/O14Stephen Fuld
6 Jul 24 iii+* Re: ancient disks, Architectural implications of locate mode I/O7John Levine
6 Jul 24 iiii`* Re: ancient disks, Architectural implications of locate mode I/O6Stephen Fuld
6 Jul 24 iiii `* Re: ancient disks, Architectural implications of locate mode I/O5John Levine
7 Jul 24 iiii  `* Re: ancient disks, Architectural implications of locate mode I/O4Stephen Fuld
7 Jul 24 iiii   `* Re: ancient disks, Architectural implications of locate mode I/O3Thomas Koenig
7 Jul 24 iiii    `* Re: ancient disks, Architectural implications of locate mode I/O2Thomas Koenig
7 Jul 24 iiii     `- Re: ancient disks, Architectural implications of locate mode I/O1Stephen Fuld
6 Jul 24 iii+- Re: Architectural implications of locate mode I/O1Lynn Wheeler
1 Aug 24 iii`* Re: Architectural implications of locate mode I/O5Lawrence D'Oliveiro
1 Aug 24 iii `* Re: Architectural implications of locate mode I/O4Stephen Fuld
1 Aug 24 iii  +* Re: Architectural implications of locate mode I/O2John Levine
2 Aug 24 iii  i`- Re: Architectural implications of locate mode I/O1Stephen Fuld
11 Aug 24 iii  `- Re: Architectural implications of locate mode I/O1Lawrence D'Oliveiro
8 Jul 24 ii`* Re: Architectural implications of locate mode I/O2Lawrence D'Oliveiro
8 Jul 24 ii `- Re: Architectural implications of locate mode I/O1Lynn Wheeler
6 Jul 24 i`* Re: Architectural implications of locate mode I/O2MitchAlsup1
6 Jul 24 i `- Re: Old printers, Architectural implications of locate mode I/O1John Levine
8 Jul 24 `* Re: Architectural implications of locate mode I/O2Lawrence D'Oliveiro
1 Aug 24  `- Re: Architectural implications of locate mode I/O1MitchAlsup1

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