Date: Fri, 9 Jul 2010 01:44:00 -0500 (CDT) From: Robert Bonomi <bonomi@mail.r-bonomi.com> To: freebsd-questions@freebsd.org Subject: Re: slow down dd - how? Message-ID: <201007090644.o696i0QK028217@mail.r-bonomi.com>
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> Date: Fri, 9 Jul 2010 02:32:18 +0200 > From: Thomas <fwd@gothschlampen.com> > Cc: FreeBSD Mailing list <freebsd-questions@freebsd.org> > Subject: Re: slow down dd - how? > > On Thu, Jul 08, 2010 at 05:50:52PM +0200, Jozsi Avadkan wrote: > > Hi, > > > How can I slow down dd? > > > > you could use some creative shellscripting (probably in addition to idprio): > > dd if=/dev/zero bs=1024k | ( dd bs=1024k count=10; sleep 3 ) | dd bs=1024k of=/dev/somewhere > > This pauses for 3 seconds for every 10MB written. ... I must be missing something. Doesn't that "dd ... ; sleep" in the sub-shell need to be in a _loop_ of some sort? I would expect the dd in the sub-shell to _exit_ after the first 10mb, whereupon the subshell would exit after the 3 second sleep, whereupon 'somebody" is going to holler about a 'broken pipe'.
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