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