Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm 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 Message-ID: <40D353CA.7010905@dynetics.com> Date: Fri, 18 Jun 2004 15:42:50 -0500 From: "Douglas A. Vechinski" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: Poor execution speeds using -mno-cygwin g77 option References: <40D34454 DOT 4050103 AT dynetics DOT com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-MailScanner-Information: Contact the Computer Center for more information X-MailScanner: Found to be clean Igor Pechtchanski wrote: >>Even though Case C, when the -mno-cygwin flag is not used, the >>difference is still significant. compared to Case A. >> >> > >That's not surprising. Cygwin is a POSIX emulation environment *on top* >of Windows -- naturally the performance of any Cygwin tool will be slower >than that of an equivalent pure Windows tool. The MinGW case is >surprising, but doesn't belong on this list. > > I was planning on sending the question to Mingw32. I never have been totally clear on how separate and distinct Cygwin and Mingw32 are. >>Is this a Cygwin problem, or g77 problem or something else. I don't >>recall experiencing such differences several years ago when doing the >>same thing. >> >> > >Things evolve. It's possible that some system calls got speeded up on >Linux (or, though doubtful, that some system calls got slowed down on >Windows). Are you using the same exact options to compile (keep in mind >that the defaults may be different on Linux and Cygwin)? As a WAG, are >you using floating point emulation instead of hardware? > I supply the same compiler flags to both under Linux and Cygwin (-O and some -D defines). To my knowledge, I'm not using floating point emulation. But if I was, how would I be able to check? -- 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/