Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes

From	Michael Stone <mstone@debian.org>
Newsgroups	linux.debian.user
Subject	Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes
Date	2024-09-16 04:50 +0200
Message-ID	<Jn9Yl-cAXd-1@gated-at.bofh.it> (permalink)
References	(2 earlier) <JkMMy-b5Pb-15@gated-at.bofh.it> <Jl4T7-bgM9-1@gated-at.bofh.it> <JmdhD-bYSL-7@gated-at.bofh.it> <JmdhD-bYSL-5@gated-at.bofh.it> <Jmjn3-c2nU-3@gated-at.bofh.it>
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On Fri, Sep 13, 2024 at 08:33:55PM +0200, tomas@tuxteam.de wrote:
>  tomas@caliban:~$ time sudo dd if=/dev/zero of=/dev/sdb bs=1M ; time sync
>  dd: error writing '/dev/sdb': No space left on device
>  15268+0 records in
>  15267+0 records out
>  16008609792 bytes (16 GB, 15 GiB) copied, 3614.25 s, 4.4 MB/s
>
>  real    60m14.260s
>  user    0m0.005s
>  sys     0m0.007s
>
>  real    0m0.077s
>  user    0m0.002s
>  sys     0m0.000s
>
>I interpret that this way: after 16G of dd (the stick is 16G) there isn't
>a significant amount of buffers lying around waiting to be flushed to the
>stick (it's a slow USB, as suggested by the 60m the dd took, so if there
>were a lot of buffers, we'd see more than .077 sec for the sync).

It's an invalid test because you hit the end of the device; there's 
nothing left to sync.

Thread

Disk drive zero-fill benchmarks for various synchronization methods  and block sizes David Christensen <dpchrist@holgerdanske.com> - 2024-09-08 20:10 +0200
  Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-09 11:00 +0200
    Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Wright <deblis@lionunicorn.co.uk> - 2024-09-09 15:40 +0200
      Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-10 11:00 +0200
        Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-13 14:10 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-13 20:40 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 04:50 +0200
              Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 06:40 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Jeffrey Walton <noloader@gmail.com> - 2024-09-13 21:10 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Christensen <dpchrist@holgerdanske.com> - 2024-09-14 01:40 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 11:10 +0200
              Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 11:20 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 12:50 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 13:00 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 13:20 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization methods and  block sizes "Rick Thomas" <rick.thomas@pobox.com> - 2024-09-13 23:20 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Wright <deblis@lionunicorn.co.uk> - 2024-09-16 21:20 +0200
  Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 05:00 +0200
    Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 12:20 +0200
      Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 13:40 +0200

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