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From: "fabio de francesco" <fmdf@tiscali.it>
Newsgroups: comp.lang.ada,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: 10 Mar 2005 20:00:20 -0800
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 comp.software-eng:4800
Date: 2005-03-10T20:00:20-08:00
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Pascal Obry wrote:

> I get:
>
> $ time matrix 100
>  270165 1061760 1453695 1856025
>
> real    0m0.033s
> user    0m0.010s
> sys     0m0.020s
>
> $ time c_matrix 100
> 270165 1061760 1453695 1856025
>
> real    0m0.033s
> user    0m0.010s
> sys     0m0.010s

I think you made a big mistake by thinking you had equal results for
matrix and c_matrix execution times. Don't look at "real" value,
because it mostly depends on how much your computer is loaded while
executing programs your're timing. That is the "real" time difference
between start and end of program that is spent also in executing other
tasks by your computer. You should only look at "user" and "sys" times
that represent how much CPU time is spent for the particular program.
"user" is time spent while executing in user address space, while "sys"
is time spent while executing in kernel space on behalf of the program.

Furthermore you'd better take times after a second execution in order
to have both programs already in memory, so times are not affected by
seeking disks and some othr operations.

Ciao,

fabio de francesco