X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: Yes, hits=5.8 required=5.0 tests=BAYES_20,BOTNET,RCVD_IN_DNSWL_NONE,RCVD_IN_SORBS_WEB X-Spam-Check-By: sourceware.org Message-id: <4BB0EA78.8030004@cygwin.com> Date: Mon, 29 Mar 2010 13:59:20 -0400 From: "Larry Hall (Cygwin)" Reply-to: cygwin@cygwin.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.21) Gecko/20090320 Remi/2.0.0.21-1.fc8.remi Lightning/0.9 Thunderbird/2.0.0.21 Mnenhy/0.7.5.0 MIME-version: 1.0 To: cygwin@cygwin.com Subject: Re: slow file open References: <680267dc1003290849s45f96dd6t1eacd043f53f7334@mail.gmail.com> <680267dc1003290851i67c10a82hf4e5c48a47969320@mail.gmail.com> In-reply-to: <680267dc1003290851i67c10a82hf4e5c48a47969320@mail.gmail.com> Content-type: text/plain; charset=UTF-8; format=flowed Content-transfer-encoding: 7bit Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: 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 On 3/29/2010 11:51 AM, Erdem Guven wrote: > Hello, > > My application uses fopen to open a lot of files. While in linux > opening and reading thousand of files doesn't even take a second; in > cygwin it takes more than 5 seconds. > > I think it is because path conversion functions in cygwin dlls. 'open' > function is a bit faster. If I use -mno-cygwin it becomes very fast > but I can't use it. > > Is there an easy way to make cygwin dlls just open files; without any > linux-windows conversion? Unfortunately, Cygwin 1.7 removed the "run really fast" switch. Stupid Cygwin! ;-) But seriously, the best way to avoid the path conversions is to not use Cygwin. Cygwin provides the POSIX paths for compatibility. If you need that compatibility, then Cygwin is for you. If you don't, then maybe it isn't. Since you mention above that you cannot use the -mno-cygwin flag that comes with the (old) compiler, I'm assuming that you have a need for the POSIX stuff that Cygwin provides. One possibility of bypassing the path handling in your programis to use '\' as your path separator in all the file paths. This won't work in all cases but it's possible it could help in yours. -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 216 Dalton Rd. (508) 893-9889 - FAX Holliston, MA 01746 _____________________________________________________________________ A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting annoying in email? -- 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