From owner-freebsd-performance@FreeBSD.ORG  Fri Sep 23 12:21:37 2005
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Date: Fri, 23 Sep 2005 17:50:11 +0530
From: Shanker Balan <shanu@shankerbalan.net>
To: freebsd-performance@freebsd.org
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Subject: Re: Finding what's causing I/O
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Hello,

Francisco Reyes wrote,
> On Fri, 23 Sep 2005, Joseph Koshy wrote:
> 
> >>Is there a way to find out which program(s) are causing the I/O?
> >
> >ktrace(8); you can use it to trace all descendants of 'init'.
> 
> Looking at the man page it's non-obvious how to use it (to me).
> 
> 
> Specially it seems one needs to indicate a pid or a command. How do I
> trace all programs?

See top(1):

    m      Toggle the display between 'cpu' and 'io' modes.

-- 
Shanker Balan