Mailing-List: contact stdcxx-dev-help@incubator.apache.org; run by ezmlm
Precedence: bulk
Reply-To: stdcxx-dev@incubator.apache.org
Received-SPF: pass (athena.apache.org: domain of msebor@gmail.com designates
 209.85.146.179 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=beta;
        h=received:message-id:date:from:organization:user-agent:mime-version:to:subject:references:in-reply-to:content-type:content-transfer-encoding:sender;
        b=iliGjwx1tJOLewEUKeJTP0Z91gUav5FV+sGZKz0ObROuBWHgVEi3sZ2z7VsSm32S7JyuUR6RpS8MC6ILdTpXCW0eOOzBoDGgCO16RFPdZD92EhUkJKpZ9fM93RC8D7v9Jl+G/gLVjKE384CTCgmkRAqKyXFRrkfbNt7pVm5GrPg=
Message-ID: <46AD15B5.5010605@roguewave.com>
Date: Sun, 29 Jul 2007 16:33:25 -0600
From: Martin Sebor <sebor@roguewave.com>
Organization: Rogue Wave Software
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
 rv:1.8.0.12) Gecko/20070719 Fedora/1.0.9-2.fc6 pango-text SeaMonkey/1.0.9
MIME-Version: 1.0
To: stdcxx-dev@incubator.apache.org
Subject: Re: atomic tests timing out on Windows
References: <7BDB2168BEAEF14C98F1901FD2DE6438BB0751@epmsa009.minsk.epam.com>
 <46A8123C.6010109@roguewave.com>
 <7BDB2168BEAEF14C98F1901FD2DE6438BB07DB@epmsa009.minsk.epam.com>
 <46A8D0AA.1050408@roguewave.com>
 <7BDB2168BEAEF14C98F1901FD2DE6438BB09B0@epmsa009.minsk.epam.com>
 <46A8EAC7.8040908@roguewave.com>
In-Reply-To: <46A8EAC7.8040908@roguewave.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: Martin Sebor <msebor@gmail.com>

Here are a couple of articles from the Intel Knowledge Base that don't
appear to come with a restrictive license or even a copyright. The code
is Windows-specific but it should be possible to translate it to
something understandable to gcc and other compilers (Sun C++ on x86).

How to Determine Whether a Processor Supports Hyper-Threading Technology:
http://www3.intel.com/cd/ids/developer/asmo-na/eng/dc/threading/knowledgebase/43843.htm

How to Determine the Number of Logical Processors per Physical
Processor:
http://www.intel.com/cd/ids/developer/asmo-na/eng/dc/threading/knowledgebase/43842.htm

Martin

Martin Sebor wrote:
> Farid Zaripov wrote:
> [...]
>>> If my analysis is correct, we should avoid scheduling the threads on 
>>> multiple logical CPUs on HT systems with a single physical CPU.
>>> Do you agree?
>>
>>   I agree. Now we need to know how to determine if the CPU has
>> more than 1 logical CPU.
> 
> It's pretty easy to figure out on modern Linux kernels from
> /proc/cpuinfo. I don't know about older kernels or Windows.
> 
>> And I think it is possible to make
>> machine with 2 HT-supporting CPU on board?
>>
>> Here (http://www.intel.com/cd/ids/developer/asmo-na/eng/275339.htm)
>> I found the program with sources, that will help us.
> 
> Good stuff! We can read it but we can't copy any of the code
> from the sample program because of the Intel license.
> 
> Martin
>