[petsc-dev] openmp

[Svetlana Tkachenko]

On Thu, 7 Nov 2013, at 14:22, Svetlana Tkachenko wrote:
> 
> 
> On Thu, 7 Nov 2013, at 14:15, Jed Brown wrote:
> > Svetlana Tkachenko <svetlana.tkachenko at fastmail.fm> writes:
> > 
> > > On Thu, 7 Nov 2013, at 13:59, Jed Brown wrote:
> > >> Svetlana Tkachenko <svetlana.tkachenko at fastmail.fm> writes:
> > >> > What do you mean? (I don't think the program name has to be 'main'.).
> > >> 
> > >> No, it doesn't.  The name is meaningless in Fortran, but you need to use
> > >> the keyword "program".
> > >> 
> > >> > ~/dev/test/petsc $ cat myexample.F90
> > >> >        program myexample
> > >> >
> > >> >            call solver
> > >> >        end
> > >> > ~/dev/test/petsc $
> > >> 
> > >> Add myexample.o to the makefile so it gets compiled.
> > >
> > > Already did, please, see:
> > >
> > > ~/dev/test/petsc $ cat makefile
> > > myexample: myexample.o solver.o
> > >                 ${CLINKER} -o $@ $^ ${PETSC_LIB}
> > >
> > > include ${PETSC_DIR}/conf/variables
> > > include ${PETSC_DIR}/conf/rules
> > > ~/dev/test/petsc $
> > 
> > Run make clean; make.  If you get the same error, check
> > 
> > $ nm myexample.o
> >                  U _gfortran_set_args
> >                  U _gfortran_set_options
> >                  U _GLOBAL_OFFSET_TABLE_
> > 0000000000000000 T main
> > 0000000000000000 r options.0.1881
> >                  U solver_
> > 
> 
> ~/dev/test/petsc $ make clean
> ~/dev/test/petsc $ make
> gfortran -c  -fPIC -Wall -Wno-unused-variable -g  -fopenmp  -I/home/<username>/petsc/include -I/home/<username>/petsc/linux-amd64/include -I/home/<username>/petsc/include/mpiuni    -o myexample.o myexample.F90
> gfortran -c  -fPIC -Wall -Wno-unused-variable -g  -fopenmp  -I/home/<username>/petsc/include -I/home/<username>/petsc/linux-amd64/include -I/home/<username>/petsc/include/mpiuni    -o solver.o solver.F90
> gcc -fopenmp -fopenmp   -fPIC -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -g3 -fno-inline -O0 -fopenmp  -o myexample myexample.o solver.o -Wl,-rpath,/home/<username>/petsc/linux-amd64/lib -L/home/<username>/petsc/linux-amd64/lib  -lpetsc -Wl,-rpath,/home/<username>/petsc/linux-amd64/lib -lflapack -lfblas -lX11 -lpthread -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/4.4.7 -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7 -lgfortran -lm -lm -lstdc++ -lstdc++ -ldl -lgcc_s -ldl
> /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
> (.text+0x20): undefined reference to `main'
> collect2: ld returned 1 exit status
> make: *** [myexample] Error 1
> ~/dev/test/petsc $ nm myexample.o
> 0000000000000000 T MAIN__
>                  U _GLOBAL_OFFSET_TABLE_
>                  U _gfortran_set_options
> 0000000000000000 r options.0.1516
>                  U solver_
> ~/dev/test/petsc $
> 

Using FLINKER instead of CLINKER in the makefile gets it to compile without errors. However, the previous behaviour persists (?).

~/dev/test/petsc $ make
gfortran -c  -fPIC -Wall -Wno-unused-variable -g  -fopenmp  -I/home/<username>/petsc/include -I/home/<username>/petsc/linux-amd64/include -I/home/<username>/petsc/include/mpiuni    -o myexample.o myexample.F90
gfortran -c  -fPIC -Wall -Wno-unused-variable -g  -fopenmp  -I/home/<username>/petsc/include -I/home/<username>/petsc/linux-amd64/include -I/home/<username>/petsc/include/mpiuni    -o solver.o solver.F90
gfortran -fopenmp -fopenmp   -fPIC -Wall -Wno-unused-variable -g  -fopenmp  -o myexample myexample.o solver.o -Wl,-rpath,/home/<username>/petsc/linux-amd64/lib -L/home/<username>/petsc/linux-amd64/lib  -lpetsc -Wl,-rpath,/home/<username>/petsc/linux-amd64/lib -lflapack -lfblas -lX11 -lpthread -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/4.4.7 -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7 -lgfortran -lm -lm -lstdc++ -lstdc++ -ldl -lgcc_s -ldl
~/dev/test/petsc $ ./myexample
 Entered petsc.
 Init done.
WARNING! There are options you set that were not used!
WARNING! could be spelling mistake, etc!
Option left: name:-threadcomm_nthreads value: 8
Option left: name:-threadcomm_type value: openmp
 Finalized.
~/dev/test/petsc $