X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-1.7 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Message-ID: <50248583.30901@tlinx.org> Date: Thu, 09 Aug 2012 20:52:35 -0700 From: Linda Walsh User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.24) Gecko/20100228 Lightning/0.9 Thunderbird/2.0.0.24 Mnenhy/0.7.6.666 MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: App runs 8x slower on dual core machine (with test case to replicate issue) References: <20120809081720 DOT GQ31757 AT calimero DOT vinschen DOT de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Zach Saw wrote: > Corinna Vinschen cygwin.com> writes: >> Thanks for the testcase, but... would you mind to change it to take the >> boost lib out of the picture, by using just plain pthread functions, if >> possible in plain C? > > Apparently someone else has already encountered similar problems in > cygwin perl > (http://www.nntp.perl.org/group/perl.perl5.porters/2011/07/msg174491.html) -------------- -- I can confirm the perl test case: Using the referenced prog: on Linux: cyg-perl-thread-test.pl This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-linux-thread-multi Processing 10 tasks in 1 threads completed in 0.468952secs Processing 10 tasks in 4 threads completed in 0.156822secs cat /proc/cpuinfo/Hz|sort |uniq model name : Intel(R) Xeon(R) CPU X5660 @ 2.80GHz cpu MHz : 1596.000 On Cygwin: This is perl 5, version 14, subversion 2 (v5.14.2) built for cygwin-thread-multi-64int Processing 10 tasks in 1 threads completed in 1.060806secs Processing 10 tasks in 4 threads completed in 9.640635secs /Users/law> cat /proc/cpuinfo|grep Hz|sort -r |uniq model name : Intel(R) Xeon(R) CPU X5680 @ 3.33GHz cpu MHz : 3325 --- Note -- neither of my cpu's have "HT" enabled.. So in both cases 'threads' must use separate processes... -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple