X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,RCVD_IN_HOSTKARMA_YE X-Spam-Check-By: sourceware.org X-Mail-Handler: Dyn Standard SMTP by Dyn X-Report-Abuse-To: abuse AT dyndns DOT com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX18z6fPIWk8/7BvYZuQ3r8gt Date: Wed, 3 Oct 2012 09:04:48 -0400 From: Christopher Faylor To: cygwin AT cygwin DOT com Subject: Re: Fifo blocking and performance issues Message-ID: <20121003130448.GB19620@ednor.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <2415374 DOT xBCzgxA7JH AT bob-kubuntu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: 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 On Wed, Oct 03, 2012 at 08:29:21AM -0400, Earnie Boyd wrote: >On Tue, Oct 2, 2012 at 3:15 PM, bob wrote: >>While this hack works the performance under Cygwin is orders of >>magnitude slower than the equivalent Linux performance. >> >>Any suggestions on how we can achieve a higher performance blocking >>read on a Cygwin RDWR fifo? >> > >You expect too much, it is Windows under the hood and no one but >Microsoft can change that performance issue. Windows alone (meaning >without Cygwin) is orders of magnitude slower than Linux. Cygwin adds >another layer of slowness just because of the emulation required. You >might get a tweak or two of milliseconds by modifying some underlying >code but you're not going to get too much more. But, again, if we are talking about differences in behavior which are not simply "Linux is faster" then provide a simple test case which works one way on Linux and another on Cygwin and I'll look into fixing the problem. cgf -- 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