From: Arjan van de Ven <arjan@infradead.org>
To: Gleb Natapov <glebn@voltaire.com>
Cc: knobi@knobisoft.de, linux-kernel@vger.kernel.org
Subject: Re: How to detect multi-core and/or HT-enabled CPUs in 2.4.x and 2.6.x kernels
Date: Wed, 27 Dec 2006 16:38:55 +0100 [thread overview]
Message-ID: <1167233935.3281.3955.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20061227152240.GC10953@minantech.com>
> If I run two threads that are doing only calculations and very little or no
> IO at all on the same socket will modern HT and dual core be the same
> (or close) performance wise?
it depends on how cache/memory bandwidth sensitive your calculation
is.... if your calculation is memory bandwidth sensitive then they're
the same. If your calculation is very sensitive to have the dataset fit
in cache.. it's another different ballgame again, because then it
depends if the cores in your dual core share the cache or not.
--
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org
next prev parent reply other threads:[~2006-12-27 15:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-27 14:16 Martin Knoblauch
2006-12-27 14:24 ` Arjan van de Ven
2006-12-27 14:40 ` Martin Knoblauch
2006-12-27 15:13 ` Arjan van de Ven
2006-12-27 15:22 ` Gleb Natapov
2006-12-27 15:38 ` Arjan van de Ven [this message]
2006-12-27 15:41 ` Martin Knoblauch
2006-12-27 15:53 ` Arjan van de Ven
2006-12-27 15:51 ` Martin Knoblauch
2006-12-27 16:09 ` Arjan van de Ven
2006-12-27 17:14 ` Bernd Eckenfels
2006-12-27 17:52 ` Martin Knoblauch
2006-12-27 19:58 ` Siddha, Suresh B
2006-12-27 14:37 ` Jan Engelhardt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1167233935.3281.3955.camel@laptopd505.fenrus.org \
--to=arjan@infradead.org \
--cc=glebn@voltaire.com \
--cc=knobi@knobisoft.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®