From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ciprian <cipicip@yahoo.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kernel 2.6 speed
Date: Mon, 25 Jul 2005 00:47:49 +0100 [thread overview]
Message-ID: <1122248869.10835.25.camel@localhost.localdomain> (raw)
In-Reply-To: <20050724191211.48495.qmail@web53608.mail.yahoo.com>
On Sul, 2005-07-24 at 12:12 -0700, Ciprian wrote:
> I'm not an OS guru, but I ran a little and very simple
> test. The program bellow, as you can see, measures the
> number of cycles performed in 30 seconds.
No it measures the performance of the "time()" call. Windows has some
funky optimisations that we never bother with because time() isn't a hot
path in the real world.
Instead try code which does
time(&start);
while(count++ < LOTS) {
Do_stuff
}
time(&end)
and you'll find the numbers on pure CPU work are essentially CPU bound
not OS affected at all
next prev parent reply other threads:[~2005-07-24 23:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-24 19:12 kernel 2.6 speed Ciprian
2005-07-24 19:41 ` Brice Goglin
2005-07-24 19:47 ` Dag Nygren
2005-07-24 20:40 ` Puneet Vyas
2005-07-24 21:03 ` Florin Malita
2005-07-24 22:49 ` Lee Revell
2005-07-25 19:52 ` Bill Davidsen
2005-07-24 21:46 ` Jan Engelhardt
2005-07-24 23:47 ` Alan Cox [this message]
2005-07-25 4:10 ` Florin Malita
2005-07-25 5:18 ` Willy Tarreau
2005-07-25 6:47 ` Ciprian
2005-07-26 5:55 ` cutaway
2005-07-26 19:45 ` Florin Malita
-- strict thread matches above, loose matches on Subject: below --
2005-08-03 15:31 Henrik Holst
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