Am Donnerstag, 26. Juli 2007 08:36 schrieb Daniel Lohmann: > benjamin schrieb: > > I have encountered a strange performance while compiling. The problem > > is; when I change some <PARAMETER> in my <PROGRAM> and recompile it via: > > > > g++ <PROGRAM> -o <OUTPUT> > > > > and run it: > > > > ./<OUTPUT> > > > > I get the <Segmentation fault> error massage. OK, but when I recompile > > it once again without changing anything: > > > > g++ <PROGRAM> -o <OUTPUT> > > > > and run it: > > > > ./<OUTPUT> > > > > , the program seems working perfectly well. This is the case only if > > program is exactly <PROGRAM>, I did not noticed such a behaviour > > before. > > Hi Benjamin, > > 1) Did you compare the output of the two g++ runs? Are there, besides time > stamps, any differences? > > 2) Did you try to compile and run on a different machine? > > I am asking all this, as in my experience such "mystical" run-time > behaviour (that seems to depend on moon phase, tide, number of executions > and so on) is a strong indication for a transient error (hardware problem). > So I'd suggest to check this first, testing on a different machine is a > simple way to get some evidence. I want to extend these experiences by the fact, that in 99% of mystical error cases there actually is no hardware problem but a user problem in myself, since I was affected by moon phase, tide, weather, too much or too less coffee or a wrong combination of other drugs I took that day or the day before, including the surrounding air, daily meals and the psycho-social states of my wife. After taking into account all those environmental parameters, or better, after freeing myself of all those environmental parameters, getting back all the concentration on the <PARAMETERS> of my <PROGRAM> I got a working <EXECUTABLE>, free of any transcendental errors or effects (99%). Please note that it is not always usefull to understand what happendend during the phase of defectiveness, once the world and the <PROGRAM> is in deterministic state again. Often the best way to repair a <PROGRAM> is to take a 15 minute walk, breathing some fresh air (99%), thinking about something that has nothing to do with all those <PARAMETERS>. bye ingo > > Daniel
