Re: Speed Problem Copying Files

[Michael Stone <mstone@debian.org>]

On Tue, May 14, 2019 at 12:11:17PM -0700, David Christensen wrote:
> 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.

Just use /dev/zero, caching is exactly as relevant to either, and 
accidently compressing a disk isn't a likely scenario.