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Date: Wed, 6 Mar 2002 14:44:02 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: Dario Bahena Tapia <dario.bahena@correo.unam.mx>
cc: linux-c-programming@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: getting process i/o wasted time ...
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On Wed, 6 Mar 2002, Dario Bahena Tapia wrote:

> Hi linux hackers ...
> 
> I'd like to know, if there's a way to get the ammount of time wasted by a
> process, while it was making i/o. I've seen that the rusage
> makes available the ammount of i/o blocks, but I'm thinking in something
> like:
> 
>           process warawara ...
>           time wasted in disks i/o .... XXX
>           time wasted in net i/o   .... XXX
>           etc. ???
> 
> Doest it makes sense? it could be done in linux?
> 
> I supposed ,that I can insert some system calls in the right places
> in the program to make this... but I'm interested in a non-intrusive
> method ...
> 
> Thanks in advance
> 
> saludos
> dario estepario ...

Time for I/O is not generally "wasted" as you say. It is given to
other tasks. Of course if there are no other tasks that want the
CPU then, I guess, you could call it wasted.

You can measure the time from when you make a system call to
the time your code gets control back. There are several
high-resolution (rdtsc) and low resolution (gettimeofday) ways
to do this. 


Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (799.53 BogoMips).

	Bill Gates? Who?

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