在 2020/8/5 下午11:32, Takashi Inoue 写道: > Hi All, > > This is my first post to here. Nice to meet you. >
Nice to meet you, too. > I may found a bug in mingw-w64. > In particular, it is in OpenMP schedule(dynamic, chunk-size). > Let me ask your opinion. > > One of my fortran program with "!$omp do schedule(dynamic,1)" > produce slightly different result at time to time. > This does not happen with GCC on FreeBSD and NAG on Windows. > So, I think nothing is wrong in my code. (But, I'm not 100% sure.) > Mingw-w64 which I installed is the latest package for msys2. > > For those who are interested in this problem, > I attach a sample code which reproduce the problem. > (This may not be appropriate for mailing list. I'm sorry). > If you run the program several times, you will get slightly > different fort.99 at time to time. > Perhaps this problem has root in POSIX threading in mingw-w64. > > Any comments and suggestions will be appreciated. > (I know no Fortran and this is only personal speculation.) Did you compile your program with the i686 compiler or the x86_64 compiler? I suspect it has something to do with the floating-point environment. -- Best regards, LH_Mouse
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