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Groups > linux.debian.user > #208652

Re: Speed Problem Copying Files

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On 5/14/19 4:23 AM, Michael Stone wrote:
> On Thu, May 09, 2019 at 10:48:31PM -0700, David Christensen wrote:
>> 2019-05-09 22:00:27 root@po /mnt/scratch
>> # time dd if=/dev/urandom of=foo bs=1M count=1K conv=fsync
> 
> don't bother doing this, urandom will be the bottleneck and it will just 
> confuse things

That was intended more as a litmus test, rather than a benchmark.  I 
chose /dev/urandom, rather than /dev/zero, to preclude the possibility 
of caches or compression.


The test succeeded in finding a disk write problem:

On 5/13/19 1:30 AM, Lothar Schilling wrote:
 > # time dd if=/dev/urandom of=test bs=1M count=100 conv=fsync
 > 100+0 Datensätze ein
 > 100+0 Datensätze aus
 > 104857600 Bytes (105 MB, 100 MiB) kopiert, 192,778 s, 544 kB/s
 > real    3m12,781s
 > user    0m0,000s
 > sys     0m1,480s


David

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Thread

Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 11:00 +0200
  Re: Speed Problem Copying Files Jonas Smedegaard <jonas@jones.dk> - 2019-05-09 11:20 +0200
    Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 11:50 +0200
      Re: Speed Problem Copying Files Kevin DAGNEAUX <kevin.dagneaux@fiitelcom.fr> - 2019-05-09 12:00 +0200
        Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 12:30 +0200
          Re: Speed Problem Copying Files Martin <keine-eile@online.de> - 2019-05-09 13:30 +0200
            Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 14:50 +0200
              Re: Speed Problem Copying Files Martin <keine-eile@online.de> - 2019-05-09 16:00 +0200
              Re: Speed Problem Copying Files "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-09 17:20 +0200
      Re: Speed Problem Copying Files Jonas Smedegaard <jonas@jones.dk> - 2019-05-09 12:30 +0200
        Re: Speed Problem Copying Files Jonas Smedegaard <jonas@jones.dk> - 2019-05-09 13:00 +0200
          Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 13:20 +0200
            Re: Speed Problem Copying Files Keith Christian <keith1christian@gmail.com> - 2019-05-09 13:30 +0200
              Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-09 14:50 +0200
  Re: Speed Problem Copying Files Gene Heskett <gheskett@shentel.net> - 2019-05-09 16:20 +0200
    Re: Speed Problem Copying Files "Jeremy Nicoll" <jn.ml.dbn.25@letterboxes.org> - 2019-05-09 16:30 +0200
      Re: Speed Problem Copying Files Dan Ritter <dsr@randomstring.org> - 2019-05-09 17:00 +0200
      Re: Speed Problem Copying Files Gene Heskett <gheskett@shentel.net> - 2019-05-09 17:00 +0200
  Re: Speed Problem Copying Files David Christensen <dpchrist@holgerdanske.com> - 2019-05-10 07:50 +0200
    Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-10 11:00 +0200
      Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-13 10:40 +0200
        Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-13 11:00 +0200
          Re: Speed Problem Copying Files Tixy <tixy@yxit.co.uk> - 2019-05-13 11:20 +0200
          Re: Speed Problem Copying Files Curt <curty@free.fr> - 2019-05-13 11:40 +0200
          Re: Speed Problem Copying Files Michael Stone <mstone@debian.org> - 2019-05-14 13:40 +0200
        Re: Speed Problem Copying Files Tixy <tixy@yxit.co.uk> - 2019-05-13 11:00 +0200
        Re: Speed Problem Copying Files David Christensen <dpchrist@holgerdanske.com> - 2019-05-14 02:30 +0200
          Re: Speed Problem Copying Files Lothar Schilling <ls@proasyl.de> - 2019-05-14 09:40 +0200
            Re: Speed Problem Copying Files David Christensen <dpchrist@holgerdanske.com> - 2019-05-14 18:30 +0200
    Re: Speed Problem Copying Files Michael Stone <mstone@debian.org> - 2019-05-14 13:30 +0200
      Re: Speed Problem Copying Files David Christensen <dpchrist@holgerdanske.com> - 2019-05-14 21:20 +0200
        Re: Speed Problem Copying Files Michael Stone <mstone@debian.org> - 2019-05-14 22:10 +0200

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