Hi All,
Finally, I found the minimal condition of my problem.
Attached very simple code reproduce the problem.
You will get different result(fort.99) at time to time.
Essential point is combination of power operation(**)
and "omp do schedule(dynamic,chunk-size)".
If we have operation ** in a do loop parallelized
with schedule(dynamic), result becomes unstable.
I don't know fundamental origin of this problem.
But, I believe this is unexpected abnormal behavior.
As I wrote, my mingw-w64 is a x86_64 package of msys2.
I have not tested other versions of mingw-w64 yet.
So, I would be grateful if you could test on your system.
Any comments and suggestions will be appreciated.
Best,
Takashi
.SUFFIXES: .f .o
FORTRAN = gfortran
FFLAGS = -fopenmp -O3 -Wall
PROG1 = demo.exe
OBJS1 = demo.o
$(PROG1) : $(OBJS1)
$(FORTRAN) $(FFLAGS) $(OBJS1) $(LIBS) -o $(PROG1)
.f.o:
$(FORTRAN) $(FFLAGS) -c $<
clean:
rm -f *.o *~ *.exe
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