Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Message-ID: <006601c12ef6$b40fa040$2f66323f@amr.corp.intel.com> From: "Tim Prince" To: "Carsten Thorenz" , References: <3790.998910256@www34.gmx.net> Subject: Re: Profiling with GPROF considered buggy? Date: Mon, 27 Aug 2001 05:48:54 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Unless I am mistaken, cygwin doesn't include any libraries built with -pg. When I wish to profile with g77, I build a copy of libg2c with -pg as well as building all my code with -pg. When I profile numerical code built with gcc, I use a mathinline.h as well as a few of my own math functions to avoid spending much time in the newlib libm. I can't tell from your message which language you are using or whether you expect all the time to be spent in your own -pg compiled code. ----- Original Message ----- From: "Carsten Thorenz" To: Sent: Monday, August 27, 2001 4:04 AM Subject: Profiling with GPROF considered buggy? > Hi! > > Recently I ran into problems profiling a scientific numerical program > using Cygwin. I've seen in the list that other people had similar problems, > but no clue was found. > > About my problems: I've compiled and linked the whole program with -pg, > ran it and used gprof to to print the profile. Now about the strange things: > > The cumulative runtime in the "flat profile" is _way_ to small. The example > I've used is running approximately 3 minutes, but only 15 seconds are > recorded in the profile. The program doesn't do much communication > with the outside world, it only crunches numbers during those 3 minutes. > Furthermore, the functions that I _know_ about using a lot of CPU-time > are not even listed in the flat profile. > > The profiling works very fine with gcc on Linux and on OS/2, but > it doesn't work for WinNT4. I've tried it with both Cygwin and > Mingw, the problems are the same. So I guess it is not the external > library that causes the problems, but the timing routines within gcc. > > My first guess: Are the timer intervals of the profiling to long, so > that it doesn't "catch" functions which are executed very fast, but > very often? > > Bye, Carsten > > > > > -- > GMX - Die Kommunikationsplattform im Internet. > http://www.gmx.net > > > > -- > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple > Bug reporting: http://cygwin.com/bugs.html > Documentation: http://cygwin.com/docs.html > FAQ: http://cygwin.com/faq/ > -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/