Re: Is Parallel Programming Hard, And, If So, What Can You Do About It?

From	Stephen Fuld <sfuld@alumni.cmu.edu.invalid>
Newsgroups	comp.arch
Subject	Re: Is Parallel Programming Hard, And, If So, What Can You Do About It?
Date	2025-05-25 16:27 -0700
Organization	A noiseless patient Spider
Message-ID	<1010910$1k3iu$1@dont-email.me> (permalink)
References	(12 earlier) <jwv8qmncayc.fsf-monnier+comp.arch@gnu.org> <100srqk$pos5$1@dont-email.me> <100vm4s$16av3$1@paganini.bofh.team> <100vq44$1h5c4$1@dont-email.me> <jwvwma47086.fsf-monnier+comp.arch@gnu.org>

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On 5/25/2025 4:16 PM, Stefan Monnier wrote:
>> No, when the disk receives a write command, it accepts the write data
>> immediately (up to some large limit).  That way, when the heads settle on
>> the track, if the disk happens to be positioned in the middle of the
>> transfer, it can write the last part of the data to the disk immediately,
>> then wait for the disk to spin to where the transfer starts to finish the
>> transferring the first part of the write data.  This reduces average
>> latency, i.e. improves performance.
> 
> Really?  I had the impression that it would be very hard to start writing
> from the middle of a sector because of the need to be sure exactly where
> in the sector we are.  IOW, the drive needs to see the inter-sector markers
> before it can start writing to a sector.

I am not sure what you mean by sector.  If you mean a disk block, 
typically used to be 512 bytes, now typically 4K bytes, then you are 
right that you can't start writing in the middle of one.  But a track 
typically has many blocks and you can start writing at any one of them. 
  So if a write is say 16K bytes and you have 4K blocks on the disk, 
then the drive could start at say the second 4K block, complete the last 
12K of the transfer, wait for the rotation then finish the first 4K block.

-- 
  - Stephen Fuld
(e-mail address disguised to prevent spam)

Thread

Is Parallel Programming Hard, And, If So, What Can You Do About It? Thomas Koenig <tkoenig@netcologne.de> - 2025-05-10 11:38 +0000
  Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-11 00:04 +0000
    Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? scott@slp53.sl.home (Scott Lurndal) - 2025-05-11 13:59 +0000
      Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Al Kossow <aek@bitsavers.org> - 2025-05-11 07:47 -0700
        Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-11 23:46 +0000
          Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-12 00:30 +0000
            Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-12 01:19 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-12 02:03 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-12 22:34 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Terje Mathisen <terje.mathisen@tmsw.no> - 2025-05-12 08:05 +0200
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-12 08:41 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-12 22:39 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-12 17:14 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-12 22:35 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-12 21:50 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-13 03:03 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-12 23:25 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-13 08:39 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? EricP <ThatWouldBeTelling@thevillage.com> - 2025-05-13 12:55 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-13 07:40 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-13 08:12 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-13 08:33 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-14 00:18 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-13 17:49 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-18 01:35 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lynn Wheeler <lynn@garlic.com> - 2025-05-18 14:10 -1000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-18 18:41 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Vir Campestris <vir.campestris@invalid.invalid> - 2025-05-19 21:46 +0100
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-19 14:58 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Vir Campestris <vir.campestris@invalid.invalid> - 2025-05-20 11:22 +0100
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lynn Wheeler <lynn@garlic.com> - 2025-05-20 16:38 -1000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-20 20:49 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-19 00:18 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-19 01:13 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-19 23:33 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-20 00:36 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? BGB <cr88192@gmail.com> - 2025-05-20 00:16 -0500
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-20 10:49 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? BGB <cr88192@gmail.com> - 2025-05-20 12:42 -0500
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-20 11:35 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-21 00:29 +0000
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                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? EricP <ThatWouldBeTelling@thevillage.com> - 2025-05-21 12:25 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? EricP <ThatWouldBeTelling@thevillage.com> - 2025-05-21 12:47 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-21 17:19 +0000
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                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-23 17:03 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-24 09:23 -0700
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                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-28 08:46 -0700
                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-28 12:08 -0400
                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-28 09:20 -0700
                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-28 12:52 -0400
                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-28 10:15 -0700
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                Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-28 13:37 -0700
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                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-25 23:58 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lynn Wheeler <lynn@garlic.com> - 2025-05-26 15:36 -1000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lars Poulsen <lars@cleo.beagle-ears.com> - 2025-05-26 20:14 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-26 07:13 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-26 07:31 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? antispam@fricas.org (Waldek Hebisch) - 2025-05-26 19:20 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-26 14:12 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-30 01:42 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-29 20:25 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-30 05:53 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lynn Wheeler <lynn@garlic.com> - 2025-05-31 12:53 -1000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? John Levine <johnl@taugh.com> - 2025-06-02 18:04 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-06-03 07:14 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? BGB <cr88192@gmail.com> - 2025-05-25 15:21 -0500
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-26 06:46 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Michael S <already5chosen@yahoo.com> - 2025-05-26 16:06 +0300
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-26 16:30 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-26 13:00 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-26 13:04 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-26 14:15 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-26 15:20 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-26 15:40 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-26 16:02 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-26 16:07 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Brett <ggtgp@yahoo.com> - 2025-05-27 18:40 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-27 12:28 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-27 12:42 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Brett <ggtgp@yahoo.com> - 2025-05-29 05:10 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-29 15:31 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Brett <ggtgp@yahoo.com> - 2025-05-30 01:17 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-29 15:33 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-27 12:28 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-26 23:12 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? scott@slp53.sl.home (Scott Lurndal) - 2025-05-26 23:32 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-05-26 19:00 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? David Brown <david.brown@hesbynett.no> - 2025-05-27 09:43 +0200
                Drive Caches (Re: Is Parallel Programming Hard, ...) Lars Poulsen <lars@cleo.beagle-ears.com> - 2025-05-25 20:55 +0000
                Re: Drive Caches (Re: Is Parallel Programming Hard, ...) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-26 00:07 -0400
                Re: Drive Caches (Re: Is Parallel Programming Hard, ...) BGB <cr88192@gmail.com> - 2025-05-26 00:59 -0500
                Re: Drive Caches (Re: Is Parallel Programming Hard, ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-26 07:13 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-23 22:19 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? EricP <ThatWouldBeTelling@thevillage.com> - 2025-05-23 20:51 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-17 23:57 +0000
  Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? quadibloc <quadibloc@gmail.com> - 2025-05-19 21:33 +0000
    Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-20 00:43 +0000
      Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? scott@slp53.sl.home (Scott Lurndal) - 2025-05-20 13:53 +0000
        Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? BGB <cr88192@gmail.com> - 2025-05-20 13:19 -0500
          Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-20 16:06 -0400
            Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-20 22:11 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? David Schultz <david.schultz@earthlink.net> - 2025-05-20 19:34 -0500
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-21 01:00 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-21 00:34 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? George Neuner <gneuner2@comcast.net> - 2025-05-20 21:30 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-20 18:39 -0700
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-21 03:41 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? George Neuner <gneuner2@comcast.net> - 2025-05-21 12:09 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-21 15:30 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-22 02:45 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lynn Wheeler <lynn@garlic.com> - 2025-05-21 07:06 -1000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? jseigh <jseigh_es00@xemaps.com> - 2025-05-21 17:32 -0400
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2025-05-21 07:05 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-22 02:48 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Stefan Monnier <monnier@iro.umontreal.ca> - 2025-05-21 08:23 -0400
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-21 14:08 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-22 02:49 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-22 17:34 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? scott@slp53.sl.home (Scott Lurndal) - 2025-05-22 17:42 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? mitchalsup@aol.com (MitchAlsup1) - 2025-05-23 01:54 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-22 22:42 +0000
                Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? George Neuner <gneuner2@comcast.net> - 2025-05-22 23:47 -0400
            Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-05-21 00:32 +0000
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-20 18:29 -0700
          Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-20 18:04 -0700
            Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-22 16:49 -0700
              Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-22 18:04 -0700
  Re: Is Parallel Programming Hard, And, If So, What Can You Do About It? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-05-20 18:31 -0700

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