dd question

[Polytropon]

On Sat, 26 Sep 2015 19:37:51 -0453.75, William A. Mahaffey III wrote:
> Update: I tried the dd again w/ 'bs=1m' & it worked much faster:

It's a more "native" block size suited for the devices in question.
512 blocks aren't much common anymore. Depending on devicees and
buses, other sizes (like bs=10m) could also achieve higher speeds
for processing.



> The 'ctrl-T' did not in fact return anything, but the 'killall -SIGINFO 
> dd' from another shell window did. 3.4-ish MB/s is quite usable, so all 
> appears well.

Ctrl+T works on FreeBSD's dd, but as far as I remember, not
on Linux's where I had to do the "SIGINFO trick". You should
see something like this:

% dd if=/dev/zero of=/dev/null bs=1m
{^T}
load: 0.12  cmd: dd 2011 [running] 2.50r 0.01u 2.41s 21% 1944k
19109+0 records in
19109+0 records out
20037238784 bytes transferred in 2.499758 secs (8015671414 bytes/sec)
{^C}
24797+0 records in
24797+0 records out
26001539072 bytes transferred in 3.239702 secs (8025904599 bytes/sec)
% 

It's the same format as the final status report, prefixed by
some runtime and load information


-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...