> On Mar 2, 2018, at 9:39 AM, Adrián Amor <aa...@pa.uc3m.es> wrote:
> 
> Thanks a lot for your early response! So, sorry if this is a very 
> straightforward question from your answer, and just to be sure, then can't I 
> use PETSC in a code where in some place OpenMP parallelization is used while 
> PETSC is called in a part of the program non-parallelized with OpenMP?

   Yes this is possible. 

> 
> Thanks!
> 
> Adrian.
> 
> 2018-03-02 16:32 GMT+01:00 Smith, Barry F. <bsm...@mcs.anl.gov>:
> 
>    PETSc is for writing parallel codes using MPI, it is not for writing 
> parallel codes with OpenMP. 
> http://www.mcs.anl.gov/petsc/miscellaneous/petscthreads.html
> 
>    Barry
> 
> 
> > On Mar 2, 2018, at 9:00 AM, Adrián Amor <aa...@pa.uc3m.es> wrote:
> >
> > Hi all,
> >
> > I have been working in the last months with PETSC in a FEM program written 
> > on FORTRAN, so far sequential. Now, I want to parallelize it with OpenMP 
> > and I have found some problems. Finally, I have built a mockup program 
> > trying to localize the error.
> >
> > 1. I have compiled PETSC with these options:
> > ./configure --with-cc=mpiicc --with-cxx=mpiicpc --with-fc=mpiifort 
> > --with-blas-lapack-dir=/opt/intel/mkl/lib/intel64/ --with-debugging=1 
> > --with-scalar-type=complex --with-threadcomm --with-pthreadclasses 
> > --with-openmp 
> > --with-openmp-include=/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  
> > --with-openmp-lib=/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin/libiomp5.a
> >  PETSC_ARCH=linux-intel-dbg PETSC-AVOID-MPIF-H=1
> >
> > (I have tried also removing   --with-threadcomm --with-pthreadclasses and 
> > with libiomp5.so).
> >
> > 2. The program to be executed is composed of two files, one is 
> > hellocount.F90:
> > MODULE hello_count
> >   use omp_lib
> >   IMPLICIT none
> >
> >   CONTAINS
> >   subroutine hello_print ()
> >      integer :: nthreads,mythread
> >
> >    !pragma hello-who-omp-f
> >    !$omp parallel
> >      nthreads = omp_get_num_threads()
> >      mythread = omp_get_thread_num()
> >      write(*,'("Hello from",i3," out of",i3)') mythread,nthreads
> >    !$omp end parallel
> >    !pragma end
> >    end subroutine hello_print
> > END MODULE hello_count
> >
> > and the other one is hellocount_main.F90:
> > Program Hello
> >
> >    USE hello_count
> >
> >    call hello_print
> >
> >    STOP
> >
> > end Program Hello
> >
> > 3. To compile these two functions I use:
> > rm -rf _obj
> > mkdir _obj
> >
> > ifort -E -I/home/aamor/petsc/include 
> > -I/home/aamor/petsc/linux-intel-dbg/include -c hellocount.F90 
> > >_obj/hellocount.f90
> > ifort -E -I/home/aamor/petsc/include 
> > -I/home/aamor/petsc/linux-intel-dbg/include -c hellocount_main.F90 
> > >_obj/hellocount_main.f90
> >
> > mpiifort -CB -g -warn all -O0 -shared-intel -check:none -qopenmp -module 
> > _obj -I./_obj -I/home/aamor/MUMPS_5.1.2/include   
> > -I/opt/intel/compilers_and_libraries_2016.1.150/linux/mkl/include 
> > -I/opt/intel/compilers_and_libraries_2016.1.150/linux/mkl/include/intel64/lp64/
> >  -I/home/aamor/petsc/include -I/home/aamor/petsc/linux-intel-dbg/include -o 
> > _obj/hellocount.o -c _obj/hellocount.f90
> > mpiifort -CB -g -warn all -O0 -shared-intel -check:none -qopenmp -module 
> > _obj -I./_obj -I/home/aamor/MUMPS_5.1.2/include   
> > -I/opt/intel/compilers_and_libraries_2016.1.150/linux/mkl/include 
> > -I/opt/intel/compilers_and_libraries_2016.1.150/linux/mkl/include/intel64/lp64/
> >  -I/home/aamor/petsc/include -I/home/aamor/petsc/linux-intel-dbg/include -o 
> > _obj/hellocount_main.o -c _obj/hellocount_main.f90
> >
> > mpiifort -CB -g -warn all -O0 -shared-intel -check:none -qopenmp -module 
> > _obj -I./_obj -o exec/HELLO _obj/hellocount.o _obj/hellocount_main.o 
> > /home/aamor/lib_tmp/libarpack_LinuxIntel15.a 
> > /home/aamor/MUMPS_5.1.2/lib/libzmumps.a 
> > /home/aamor/MUMPS_5.1.2/lib/libmumps_common.a 
> > /home/aamor/MUMPS_5.1.2/lib/libpord.a 
> > /home/aamor/parmetis-4.0.3/lib/libparmetis.a 
> > /home/aamor/parmetis-4.0.3/lib/libmetis.a 
> > -L/opt/intel/compilers_and_libraries_2016.1.150/linux/mkl/lib/intel64 
> > -lmkl_scalapack_lp64 -lmkl_blacs_intelmpi_lp64 -lpetsc -lmkl_intel_lp64 
> > -lmkl_intel_thread -lmkl_core -lmkl_lapack95_lp64 -liomp5 -lpthread -lm 
> > -L/home/aamor/lib_tmp -lgidpost -lz /home/aamor/lua-5.3.3/src/liblua.a 
> > /home/aamor/ESEAS-master/libeseas.a 
> > -Wl,-rpath,/home/aamor/petsc/linux-intel-dbg/lib 
> > -L/home/aamor/petsc/linux-intel-dbg/lib 
> > -Wl,-rpath,/opt/intel/mkl/lib/intel64 -L/opt/intel/mkl/lib/intel64 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -L/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  
> > -L/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -Wl,-rpath,/opt/intel/mpi-rt/5.1/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/mpi-rt/5.1/intel64/lib -lmkl_intel_lp64 
> > -lmkl_sequential -lmkl_core -lpthread -lX11 -lssl -lcrypto -lifport 
> > -lifcore_pic -lmpicxx -ldl 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib -lmpifort -lmpi -lmpigi -lrt 
> > -lpthread -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -L/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  
> > -L/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -L/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib 
> > -Wl,-rpath,/opt/intel/mpi-rt/5.1/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/mpi-rt/5.1/intel64/lib -limf -lsvml -lirng -lm -lipgo 
> > -ldecimal -lcilkrts -lstdc++ -lgcc_s -lirc -lirc_s 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib/debug_mt 
> > -Wl,-rpath,/opt/intel/impi/5.1.2.150/intel64/lib 
> > -L/opt/intel/impi/5.1.2.150/intel64/lib 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -L/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  
> > -L/opt/intel/compilers_and_libraries_2016.1.150/linux/compiler/lib/intel64_lin
> >  -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7 
> > -Wl,-rpath,/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 
> > -L/opt/intel/compilers_and_libraries_2016/linux/mkl/lib/intel64 -ldl
> >
> > exec/HELLO
> >
> > 4. Then I have seen that:
> > 4.1. If I set OMP_NUM_THREADS=2 and I remove -lpetsc and -lifcore_pic from 
> > the last step, I got:
> > Hello from  0 out of  2
> > Hello from  1 out of  2
> > 4.2 But if add -lpetsc and -lifcore_pic (because I want to use PETSC) I get 
> > this error:
> > Hello from  0 out of  2
> > forrtl: severe (40): recursive I/O operation, unit -1, file unknown
> > Image              PC                Routine            Line        Source
> > HELLO              000000000041665C  Unknown               Unknown  Unknown
> > HELLO              00000000004083C8  Unknown               Unknown  Unknown
> > libiomp5.so        00007F9C603566A3  Unknown               Unknown  Unknown
> > libiomp5.so        00007F9C60325007  Unknown               Unknown  Unknown
> > libiomp5.so        00007F9C603246F5  Unknown               Unknown  Unknown
> > libiomp5.so        00007F9C603569C3  Unknown               Unknown  Unknown
> > libpthread.so.0    0000003CE76079D1  Unknown               Unknown  Unknown
> > libc.so.6          0000003CE6AE88FD  Unknown               Unknown  Unknown
> > If you set OMP_NUM_THREADS to 8, I get:
> > forrtl: severe (40): recursive I/O operation, unit -1, file unknown
> > forrtl: severe (40): recursive I/O operation, unit -1, file unknown
> > forrtl: severe (40): recursive I/O operation, unit -1, file unknown
> >
> > I am sorry if this is a trivial problem because I guess that lots of people 
> > use PETSC with OpenMP in FORTRAN, but I have really done my best to figure 
> > out where the error is. Can you help me?
> >
> > Thanks a lot!
> >
> > Adrian.
> 
> 

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