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	Fri, 25 Mar 2005 20:17:13 PST
Date: Fri, 25 Mar 2005 20:17:13 -0800 (PST)
From: Jonathan Stewart <jonstew1983@yahoo.com>
To: Giorgos Keramidas <keramida@ceid.upatras.gr>
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cc: Dan Nelson <dnelson@allantgroup.com>
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Subject: Re: Discrepancy between ps -i -o inblk and figuring numbers by hand
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--- Giorgos Keramidas <keramida@ceid.upatras.gr> wrote:
> 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.
> 
As I mentioned in an earlier email my main use of this is really just
for one program.  I can do a du to find out how much information it
needs to read and then by watching how much it has read get a rough
idea of how much longer it will be.  Not really a necessary feature
just a "nice to have" kind of thing.

Jonathan


		
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