Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com To: cygwin@cygwin.com From: Rolf Campbell Subject: Re: two instances of a.exe on dual processor - still only 50% performance Date: Wed, 07 Jul 2004 13:57:14 -0400 Lines: 20 Message-ID: References: <40EBF4C7.B2E27B6D@dessent.net> <6.0.1.1.2.20040707133057.02770728@127.0.0.1> Reply-To: cygwin.0.endlisnis@spamgourmet.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: ottgw.tropicnetworks.com User-Agent: Mozilla Thunderbird 0.7.1 (Windows/20040626) In-Reply-To: <6.0.1.1.2.20040707133057.02770728@127.0.0.1> Ken Thompson wrote: > At 01:24 PM 7/7/2004, Rolf Campbell wrote: >> >> Sorry Brian, that is bogus. I'm running one HT processor right now. >> The combined CPU utilization is not an actual display of usage, but >> theoretical usage, based on scheduling. It's really how much of the >> CPU was NOT being used by the idle task, and given that there is only >> one CPU, if some process is taking up 99% of it, and some other >> process takse up the other 1% on the other 'hyper thread' then the >> idle task will not be able to run at all on either virtual cpu. Thus >> Task Manager will (and does) show 100% dual CPU utilization. >> >> -Rolf > > > Sorry Rolf, but at least on my HT processor running Windows XP pro, the > reporting of utilization by task manager is exactly as described by Brian. Strange, I'm running WinXP pro, all patched up. And if I run two CPU bound programs (cygwin or not) my utilization goes to 100% (easily). -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/