Date: Sun, 27 Sep 2015 13:10:36 +0200 From: Polytropon <freebsd@edvax.de> To: "William A. Mahaffey III" <wam@hiwaay.net> Cc: FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: dd question Message-ID: <20150927131036.c6b2d9ce.freebsd@edvax.de> In-Reply-To: <56073915.6030707@hiwaay.net> References: <5606A4FF.4090105@hiwaay.net> <CA%2BtpaK3UOEfKSfSjbdcH%2BR2jaU9=XVBEg%2B%2Bjn5VCbiiUkLF_Tg@mail.gmail.com> <56073915.6030707@hiwaay.net>
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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, ...
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