From owner-freebsd-questions@FreeBSD.ORG  Thu Aug  7 20:22:36 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id DE6D8106566B
	for <freebsd-questions@freebsd.org>;
	Thu,  7 Aug 2008 20:22:36 +0000 (UTC)
	(envelope-from josh.carroll@gmail.com)
Received: from yw-out-2324.google.com (yw-out-2324.google.com [74.125.46.31])
	by mx1.freebsd.org (Postfix) with ESMTP id 966938FC12
	for <freebsd-questions@freebsd.org>;
	Thu,  7 Aug 2008 20:22:36 +0000 (UTC)
	(envelope-from josh.carroll@gmail.com)
Received: by yw-out-2324.google.com with SMTP id 9so327875ywe.13
	for <freebsd-questions@freebsd.org>;
	Thu, 07 Aug 2008 13:22:35 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:received:received:message-id:date:from:reply-to
	:to:subject:cc:in-reply-to:mime-version:content-type
	:content-transfer-encoding:content-disposition:references;
	bh=IAC3bJH8COwoTP5AHvBxcBO2A2b3mKlw1fT1f7uJWjE=;
	b=cp1t6+yxOemikwNvRdY1ieG+OK27qQ3hVCSrJsaic6ldkY/mhBRsZbMBXGKunNkfyF
	5nnuR+j18LI9St8OqeBYo7T2blt1m4+wyKvljSTMtaohDWdCqnjLjqKmoco611ET78IK
	IHy10FdvsQVnfDIQB9wUPRfFZvFkC7LxCFGNE=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=message-id:date:from:reply-to:to:subject:cc:in-reply-to
	:mime-version:content-type:content-transfer-encoding
	:content-disposition:references;
	b=tz+IOQvOfgmf1qQOgxfGNd05w7Fc+XbYIjXiXciqp2Uyt6W+17vsJ6u7d0EASCzqRN
	kSrlNmWVkzv8iL/4qVaaQbsVWF6KDM58vjxgE0L4LPaW7v8WYuWR/8EBHkbYtr5y8T5u
	0RlhjOymEdWHqD/DPPIr8cIf1+ClPScn5q7UU=
Received: by 10.151.114.9 with SMTP id r9mr5950168ybm.166.1218140555836;
	Thu, 07 Aug 2008 13:22:35 -0700 (PDT)
Received: by 10.150.140.14 with HTTP; Thu, 7 Aug 2008 13:22:35 -0700 (PDT)
Message-ID: <8cb6106e0808071322o17271fe9oefe1af2bf54fe931@mail.gmail.com>
Date: Thu, 7 Aug 2008 16:22:35 -0400
From: "Josh Carroll" <josh.carroll@gmail.com>
To: "Ronald F. Guilmette" <rfg@tristatelogic.com>
In-Reply-To: <32214.1218139739@tristatelogic.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <32214.1218139739@tristatelogic.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: Questions about healthd and mprime
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: josh.carroll@gmail.com
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Aug 2008 20:22:36 -0000

> OK, so _now_ I've looked around and found out that a lot of folks
> these days heat up their CPUs by running the "mprime" thingy.  Swell.
> But I don't know diddly poo about this program.  So can somebody please
> tell me the set of "best" command line options for the thing if your
> only goal is to stress your CPU?
>
> Thanks in advance.

If you just want to heat up your CPU, this should suffice:

yes > /dev/null &

Once for each CPU/core.

mprime is useful to stress test the cores, looking for a situation
where the core fails. This can cause odd system problems, and not
necessarily a crash or lock up.

But in terms of just heating the cores up, "yes" should do the trick.

Josh