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Date: Fri, 25 Mar 2005 22:30:53 +0200
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Jonathan Stewart <jonstew1983@yahoo.com>
Message-ID: <20050325203052.GA1680@gothmog.gr>
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cc: Dan Nelson <dnelson@allantgroup.com>
cc: freebsd-questions@freebsd.org
Subject: Re: Discrepancy between ps -i -o inblk and figuring numbers by hand
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On 2005-03-25 10:08, Jonathan Stewart <jonstew1983@yahoo.com> wrote:
> --- Giorgos Keramidas keramida at ceid dot upatras dot gr wrote:
> > So, what you are looking for is a single byte count that increases
> > sequentially for all read() and write() system calls?
>
> Pretty much, yes. To be specific all read() and write() calls for a
> given process.  Even something that counted in 512 byte or UFUFSlocks
> would be useful.

To what end, may I ask?  Per process statistics may include byte counts from a
few thousand threads that read and/or write from a few hundred descriptors.

Even per file descriptor statistics quickly get useless when one considers
that a single byte read may cause the read-ahead of a few thousand bytes or
that a single write may reach the corresponding device several seconds later.