I was curious to see where we stood in comparison, so I did the command you
showed below, on our z9 with two IFLs, running z/VM 5.2, emulated mod 27's
on a DS8600, and SuSE SLES 9, with the following results:
rockhopper:~ # time dd bs=1024 count=1048576 if=/dev/zero of=/iso/test1
1048576+0 records in
1048576+0 records out
real 0m14.574s
user 0m0.100s
sys 0m3.250s
rockhopper:~ #
We compared this to an Intel Linux, and found out that we were about twice
as fast for the file creation, but was about twice as slow copying the file
to another file or to read the file and drop it in /dev/null. This could
have been because the dd command handles blocks, but the file was read and
copied using cp and cat.
Not sure if this helps anyone, but it was an interesting exercise, and
killed the first hour of the meeting I'm currently in. :-)
--
.~. Robert P. Nix Mayo Foundation
/V\ RO-OE-5-55 200 First Street SW
/( )\ 507-284-0844 Rochester, MN 55905
^^-^^ -----
"In theory, theory and practice are the same, but
in practice, theory and practice are different."
On 6/14/07 7:22 AM, "Mark Perry" <[EMAIL PROTECTED]> wrote:
> Hi Eric,
> just for fun on our SLES10 s390x using 3390-9 (Shark) on a z/900 under
> z/VM 5.2 without any tuning at all:
>
> ihlscov2:~ # time dd bs=1024 count=1048576 if=/dev/zero of=/test1
> 1048576+0 records in
> 1048576+0 records out
> 1073741824 bytes (1.1 GB) copied, 72.3474 seconds, 14.8 MB/s
>
> real 1m12.357s
> user 0m0.944s
> sys 0m23.172s
> ihlscov2:~ #
>
>
> Mark
>
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