From: Vasile Rotaru <vrotaru@seznam.cz>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] hyperthreading
Date: Mon, 5 Jan 2004 11:03:34 +0000 [thread overview]
Message-ID: <bsn6bb$e4nr9$1@ID-216690.news.uni-berlin.de> (raw)
In-Reply-To: <Pine.LNX.4.44.0312280911230.31428-100000@maxroach.lanl.gov>
On Sun, 28 Dec 2003 17:12:48 +0100, ron minnich wrote:
> hyperthreading: don't waste your time.
>
> hype-r-threading.
>
> ron
Let's say if I understand it correctly.
I take a very simple example, say we need to fill a big array.
case a: Single processor, single thread
(the base case)
case b: Single processor, two threads.
(one fills the even, the other the odd positions).
Slower, time lost in task switch.
case c: Single HP processor two threads.
A litle faster than in case b), since less time lost in task switch.
case d) Two processors, two threads.
Solid speed gain, almost two times faster.
So I just can't think of a realistic scenario, where the speed of task
switching will be noticeable..
bas
next prev parent reply other threads:[~2004-01-05 11:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-26 23:05 andrey mirtchovski
2003-12-27 0:00 ` jmk
2003-12-27 18:39 ` jmk
2003-12-28 16:11 ` ron minnich
2003-12-28 22:12 ` Joel Salomon
2003-12-29 1:47 ` William Josephson
2003-12-31 17:08 ` ron minnich
2004-01-05 11:03 ` Vasile Rotaru [this message]
2004-01-05 14:31 ` David Presotto
2004-01-05 15:32 ` ron minnich
2003-12-27 4:10 ` [9fans] fossil/venti vdharani
2003-12-27 4:49 ` okamoto
2003-12-27 7:52 ` vdharani
2003-12-27 5:20 ` mirtchov
2003-12-28 4:47 ` okamoto
2003-12-28 8:22 ` vdharani
2003-12-28 6:40 ` andrey mirtchovski
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