X-Spam-Check-By: sourceware.org Date: Wed, 15 Mar 2006 14:30:25 -0500 From: Christopher Faylor To: cygwin AT cygwin DOT com Subject: Re: select() too slow Message-ID: <20060315193025.GE20011@trixie.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <1753CE61-D772-46F7-8393-84E419E49307 AT ptnix DOT com> <4412EF74 DOT 1070500 AT byu DOT net> <890F74C6-8E51-405F-86CC-551170A2EA70 AT honeynet-pt DOT org> <20060311181653 DOT GA10054 AT trixie DOT casa DOT cgf DOT cx> <20060314191855 DOT GA17565 AT trixie DOT casa DOT cgf DOT cx> <1B24AE67-B28C-4D8E-A655-5D42E92B7F0C AT honeynet-pt DOT org> <20060314224304 DOT GC7159 AT trixie DOT casa DOT cgf DOT cx> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk 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, Mar 15, 2006 at 07:07:05PM +0000, Pedro Inacio wrote: >On 2006/03/14, at 22:43, Christopher Faylor wrote: > >>On Tue, Mar 14, 2006 at 09:42:25PM +0000, Pedro Inacio wrote: >> >>I don't have any 100MB files sitting around but when I tried this on a >>14MB file, I find that cygwin is about 2X slower, not an order of >>magnitude slower. Taking away the pipe and using regular file >>redirection >>makes things a little faster on cygwin. >> >>So, I can't explain why you are seeing such extreme slowdowns. I am >>using the equivalent of a snapshot in my tests, however. Maybe that's >>the difference. > >I have created a 14MB file and the results were: > >On Linux: 4 seconds On Cygwin: 44 Seconds > >The test were made on 3 different platforms, and the results the same. >Cygwin is not just 2X slower but 11X slower, each is too much. >Another thing, what have the pipe and the file redirection to do with >the results? That command is given always on a Unix box which is the >client of the echo_server. Is just the echo_server that runs on Cygwin >or Linux. ;) Ah. When you said "run it and do the same", I thought you were saying to run the the client/server on Cygwin, as you did with linux, not to run the client on linux and the server on Cygwin. I do see a slowdown when running the client on linux however, since it's the same select() connected to the same IP address, running the same way, it's hard to see how select() would be implicated. That seems to point to winsock, if anything. cgf -- 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/