[petsc-users] runtime error on Summit with nvhpc21.7

Mark Adams mfadams at lbl.gov
Fri Aug 27 17:16:43 CDT 2021 

And I found that this C++ code calls PetscIntiialize from Fortran code.
Hence the Fortran library in the call stack.

F90 tests work but our tests are pure Fortran.

Should they be using nvcc_wrapper (a Kokkos version) as a linker?

Thanks,
Mark

On Fri, Aug 27, 2021 at 6:05 PM Mark Adams <mfadams at lbl.gov> wrote:

>
>
> On Fri, Aug 27, 2021 at 5:03 PM Junchao Zhang <junchao.zhang at gmail.com>
> wrote:
>
>> I don't understand the configure options
>>
>>
>> --with-cc=/gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/nvhpc21.7/bin/
>> *nvcc_wrapper*
>> --with-cxx=/gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/nvhpc21.7/bin/nvcc_wrapper
>> --with-fc=/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/spectrum-mpi-10.4.0.3-20210112-nv7jd363ym3n4zpgornfbq6bh4tqjyak/bin/mpifort
>> COPTFLAGS="-g -fast" CXXOPTFLAGS="-g -fast" FOPTFLAGS="-g -fast"
>> CUDAFLAGS="-ccbin nvc++" --with-ssl=0 --with-batch=0 --with-mpiexec="jsrun
>> -g 1" *--with-cuda=0*
>> --with-cudac=/gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/nvhpc21.7/bin/nvcc_wrapper
>> --with-cuda-gencodearch=70 --download-metis --download-parmetis --with-x=0
>> --with-debugging=0 PETSC_ARCH=arch-summit-opt-nvhpc
>> --prefix=/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b
>>
>> Why do you need to use nvcc_wrapper if you do not want to use cuda?
>>
>
> That code that is having a problem links with nvcc_wrapper.
> They get a segv that I sent earlier, in PetscInitialize so I figure I
> should use the same compiler / linker.
> They use CUDA, but we don't need PETSc to use CUDA now.
>
>
>> In addition, nvcc_wrapper is a C++ compiler. Using it for --with-cc=, you
>> also need --with-clanguage=c++
>>
>
> I rebuilt PETSc with mpicc, mpiCC, mpif90 and --with-nvcc=nvcc_wrapper
> and that built make check works. I gave it to them to test.
>
> Thanks,
> Mark
>
>
>>
>> --Junchao Zhang
>>
>>
>> On Fri, Aug 27, 2021 at 3:28 PM Mark Adams <mfadams at lbl.gov> wrote:
>>
>>>
>>>
>>> On Fri, Aug 27, 2021 at 3:56 PM Junchao Zhang <junchao.zhang at gmail.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Fri, Aug 27, 2021, 1:52 PM Mark Adams <mfadams at lbl.gov> wrote:
>>>>
>>>>> I think the problem is that I build with MPICC and they use nvcc_wrapper.
>>>>> I could just try building PETSc with CC=nvcc_wrapper, but it was not
>>>>> clear if this was the way to go.
>>>>>
>>>> --with-nvcc=nvcc_wrapper
>>>>
>>>
>>> What do I specify for cc and CC?
>>>
>>>
>>>> I will try it.
>>>>> Thanks,
>>>>> Mark
>>>>>
>>>>> On Fri, Aug 27, 2021 at 10:50 AM Junchao Zhang <
>>>>> junchao.zhang at gmail.com> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Aug 27, 2021 at 7:06 AM Mark Adams <mfadams at lbl.gov> wrote:
>>>>>>
>>>>>>> I have a user (cc'ed) that has a C++ code and is using a PETSc that
>>>>>>> I built. He is getting this runtime error.
>>>>>>>
>>>>>>> 'make check' runs clean and I built snes/tutorial/ex1 manually, to
>>>>>>> get a link line, and it ran fine.
>>>>>>> I appended the users link line and my test.
>>>>>>>
>>>>>>> I see that they are using Kokkos' "nvcc_wrapper". Should I rebuild
>>>>>>> PETSc using that, maybe we just need to make sure we are both using the
>>>>>>> same underlying compiler or should they use mpiCC?
>>>>>>>
>>>>>> It looks like they used nvcc_wrapper to replace nvcc.  You can ask
>>>>>> them to use nvcc directly to see what happens. But the error happened in
>>>>>> petsc initialization, petscsys_petscinitializenohelp, so I doubt it
>>>>>> helps.  The easy way is to just attach a debugger.
>>>>>>
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Mark
>>>>>>>
>>>>>>>
>>>>>>> [e13n16:591873] *** Process received signal ***
>>>>>>>
>>>>>>> [e13n16:591873] Signal: Segmentation fault (11)
>>>>>>>
>>>>>>> [e13n16:591873] Signal code: Invalid permissions (2)
>>>>>>>
>>>>>>> [e13n16:591873] Failing at address: 0x102c87e0
>>>>>>>
>>>>>>> [e13n16:591873] [ 0]
>>>>>>> linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)[0x2000000504d8]
>>>>>>>
>>>>>>> [e13n16:591873] [ 1] [e13n16:591872] *** Process received signal ***
>>>>>>>
>>>>>>> [e13n16:591872] Signal: Segmentation fault (11)
>>>>>>>
>>>>>>> [e13n16:591872] Signal code: Invalid permissions (2)
>>>>>>>
>>>>>>> [e13n16:591872] Failing at address: 0x102c87e0
>>>>>>>
>>>>>>> [e13n16:591872] [ 0]
>>>>>>> linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)[0x2000000504d8]
>>>>>>>
>>>>>>> [e13n16:591872] [ 1] [e13n16:591871] *** Process received signal ***
>>>>>>>
>>>>>>> [e13n16:591871] Signal: Segmentation fault (11)
>>>>>>>
>>>>>>> [e13n16:591871] Signal code: Invalid permissions (2)
>>>>>>>
>>>>>>> [e13n16:591871] Failing at address: 0x102c87e0
>>>>>>>
>>>>>>> [e13n16:591871] [ 0]
>>>>>>> linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)[0x2000000504d8]
>>>>>>>
>>>>>>> [e13n16:591871] [ 1]
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib/libnvf.so(pgf90_str_copy_klen+0x1fc)[0x200004a79ee4]
>>>>>>>
>>>>>>> [e13n16:591871] [ 2] [e13n16:591874] *** Process received signal ***
>>>>>>>
>>>>>>> [e13n16:591874] Signal: Segmentation fault (11)
>>>>>>>
>>>>>>> [e13n16:591874] Signal code: Invalid permissions (2)
>>>>>>>
>>>>>>> [e13n16:591874] Failing at address: 0x102c87e0
>>>>>>>
>>>>>>> [e13n16:591874] [ 0]
>>>>>>> linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)[0x2000000504d8]
>>>>>>>
>>>>>>> [e13n16:591874] [ 1]
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib/libnvf.so(pgf90_str_copy_klen+0x1fc)[0x200004a79ee4]
>>>>>>>
>>>>>>> [e13n16:591874] [ 2]
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libpetsc.so.3.015(petscsys_petscinitializenohelp_+0xf4)[0x20000097b3ec]
>>>>>>>
>>>>>>> [e13n16:591874] [ 3]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10131dd8]
>>>>>>>
>>>>>>> [e13n16:591874] [ 4]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015c60]
>>>>>>>
>>>>>>> [e13n16:591874] [ 5]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x1005a8b0]
>>>>>>>
>>>>>>> [e13n16:591874] [ 6]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015b14]
>>>>>>>
>>>>>>> [e13n16:591874] [ 7]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10014cd0]
>>>>>>>
>>>>>>> [e13n16:591874] [ 8]
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libpetsc.so.3.015(petscsys_petscinitializenohelp_+0xf4)[0x20000097b3ec]
>>>>>>>
>>>>>>> [e13n16:591871] [ 3]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10131dd8]
>>>>>>>
>>>>>>> [e13n16:591871] [ 4]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015c60]
>>>>>>>
>>>>>>> [e13n16:591871] [ 5]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x1005a8b0]
>>>>>>>
>>>>>>> [e13n16:591871] [ 6]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015b14]
>>>>>>>
>>>>>>> [e13n16:591871] [ 7]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10014cd0]
>>>>>>>
>>>>>>> [e13n16:591871] [ 8]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(+0x24078)[0x200005934078]
>>>>>>>
>>>>>>> [e13n16:591871] [ 9]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(__libc_start_main+0xb4)[0x200005934264]
>>>>>>>
>>>>>>> [e13n16:591871] *** End of error message ***
>>>>>>>
>>>>>>>
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(+0x24078)[0x200005934078]
>>>>>>>
>>>>>>> [e13n16:591874] [ 9]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(__libc_start_main+0xb4)[0x200005934264]
>>>>>>>
>>>>>>> [e13n16:591874] *** End of error message ***
>>>>>>>
>>>>>>>
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib/libnvf.so(pgf90_str_copy_klen+0x1fc)[0x200004a79ee4]
>>>>>>>
>>>>>>> [e13n16:591872] [ 2]
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libpetsc.so.3.015(petscsys_petscinitializenohelp_+0xf4)[0x20000097b3ec]
>>>>>>>
>>>>>>> [e13n16:591872] [ 3]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10131dd8]
>>>>>>>
>>>>>>> [e13n16:591872] [ 4]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015c60]
>>>>>>>
>>>>>>> [e13n16:591872] [ 5]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x1005a8b0]
>>>>>>>
>>>>>>> [e13n16:591872] [ 6]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015b14]
>>>>>>>
>>>>>>> [e13n16:591872] [ 7]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10014cd0]
>>>>>>>
>>>>>>> [e13n16:591872] [ 8]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(+0x24078)[0x200005934078]
>>>>>>>
>>>>>>> [e13n16:591872] [ 9]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(__libc_start_main+0xb4)[0x200005934264]
>>>>>>>
>>>>>>> [e13n16:591872] *** End of error message ***
>>>>>>>
>>>>>>>
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib/libnvf.so(pgf90_str_copy_klen+0x1fc)[0x200004a79ee4]
>>>>>>>
>>>>>>> [e13n16:591873] [ 2]
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libpetsc.so.3.015(petscsys_petscinitializenohelp_+0xf4)[0x20000097b3ec]
>>>>>>>
>>>>>>> [e13n16:591873] [ 3]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10131dd8]
>>>>>>>
>>>>>>> [e13n16:591873] [ 4]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015c60]
>>>>>>>
>>>>>>> [e13n16:591873] [ 5]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x1005a8b0]
>>>>>>>
>>>>>>> [e13n16:591873] [ 6]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10015b14]
>>>>>>>
>>>>>>> [e13n16:591873] [ 7]
>>>>>>> /ccs/home/scheinberg/new_install/build/bin/xgc-es-cpp[0x10014cd0]
>>>>>>>
>>>>>>> [e13n16:591873] [ 8]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(+0x24078)[0x200005934078]
>>>>>>>
>>>>>>> [e13n16:591873] [ 9]
>>>>>>> /usr/lib/gcc/ppc64le-redhat-linux/8/../../../../lib64/power9/libc.so.6(__libc_start_main+0xb4)[0x200005934264]
>>>>>>>
>>>>>>> [e13n16:591873] *** End of error message ***
>>>>>>>
>>>>>>> ERROR:  One or more process (first noticed rank 1) terminated with
>>>>>>> signal 11 (core dumped)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/nvhpc21.7/bin/nvcc_wrapper
>>>>>>> -arch=sm_70 CMakeFiles/xgc-es-cpp.dir/xgc-es-cpp_build_info.F90.o -o
>>>>>>> bin/xgc-es-cpp  -Wl,-rpath,/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib:/gpfs/alpine/world-shared/phy122/lib/install/summit/adios2/devel/nvhpc/lib64
>>>>>>> liblibxgc-es-cpp.a
>>>>>>> /sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/netlib-lapack-3.9.1-b5iqtudpwjumes5gsdol3bzsh7qlv7mf/lib64/liblapack.so
>>>>>>> /sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/netlib-lapack-3.9.1-b5iqtudpwjumes5gsdol3bzsh7qlv7mf/lib64/libblas.so
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libpetsc.so
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libparmetis.so
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7b/lib/libmetis.so
>>>>>>> /sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/fftw-3.3.9-bzi7deue27ijd7xm4zn7pt22u4sj47g4/lib/libfftw3.so
>>>>>>> libs/pspline/libpspline.a libs/camtimers/libtimers.a
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib/libacchost.so
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/adios2/devel/nvhpc/lib64/libadios2_fortran_mpi.so.2.7.1
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/adios2/devel/nvhpc/lib64/libadios2_fortran.so.2.7.1
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/DEFAULT/install/lib64/libkokkoscontainers.a
>>>>>>> /gpfs/alpine/world-shared/phy122/lib/install/summit/kokkos/DEFAULT/install/lib64/libkokkoscore.a
>>>>>>> /usr/lib64/libcuda.so
>>>>>>> /autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/cuda/11.0/lib64/libcudart.so
>>>>>>> /usr/lib64/libdl.so -lmpi_ibm_usempif08 -lmpi_ibm_usempi_ignore_tkr
>>>>>>> -lmpi_ibm_mpifh -lnvf
>>>>>>> -Wl,-rpath-link,/gpfs/alpine/world-shared/phy122/lib/install/summit/adios2/devel/nvhpc/lib64
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 19:39 main=
>>>>>>> /gpfs/alpine/csc314/scratch/adams/petsc/src/snes/tutorials$ make
>>>>>>> PETSC_DIR=/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7
>>>>>>> PETSC_ARCH="" ex1
>>>>>>> *mpicc* -fPIC -g -fast  -fPIC -g -fast
>>>>>>>  -I/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7/include
>>>>>>>     ex1.c
>>>>>>>  -Wl,-rpath,/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7/lib
>>>>>>> -L/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7/lib
>>>>>>> -Wl,-rpath,/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7/lib
>>>>>>> -L/gpfs/alpine/world-shared/phy122/lib/install/summit/petsc/current/opt-nvhpc21.7/lib
>>>>>>> -Wl,-rpath,/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/spectrum-mpi-10.4.0.3-20210112-nv7jd363ym3n4zpgornfbq6bh4tqjyak/lib
>>>>>>> -L/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/spectrum-mpi-10.4.0.3-20210112-nv7jd363ym3n4zpgornfbq6bh4tqjyak/lib
>>>>>>> -Wl,-rpath,/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/hdf5-1.10.7-nfhjvzsshg5qihqv44y5ji6ihsqpd73v/lib
>>>>>>> -L/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/hdf5-1.10.7-nfhjvzsshg5qihqv44y5ji6ihsqpd73v/lib
>>>>>>> -Wl,-rpath,/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/netlib-lapack-3.9.1-b5iqtudpwjumes5gsdol3bzsh7qlv7mf/lib64
>>>>>>> -L/sw/summit/spack-envs/base/opt/linux-rhel8-ppc64le/nvhpc-21.7/netlib-lapack-3.9.1-b5iqtudpwjumes5gsdol3bzsh7qlv7mf/lib64
>>>>>>> -Wl,-rpath,/autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib
>>>>>>> -L/autofs/nccs-svm1_sw/summit/nvhpc_sdk/rhel8/Linux_ppc64le/21.7/compilers/lib
>>>>>>> -Wl,-rpath,/usr/lib/gcc/ppc64le-redhat-linux/8
>>>>>>> -L/usr/lib/gcc/ppc64le-redhat-linux/8 -lpetsc -llapack -lblas -lparmetis
>>>>>>> -lmetis -lstdc++ -ldl -lpthread -lmpiprofilesupport -lmpi_ibm_usempif08
>>>>>>> -lmpi_ibm_usempi_ignore_tkr -lmpi_ibm_mpifh -lmpi_ibm -lnvf -lnvomp
>>>>>>> -latomic -lnvhpcatm -lnvcpumath -lnvc -lrt -lm -lgcc_s -lstdc++ -ldl -o ex1
>>>>>>> 19:40 main=
>>>>>>> /gpfs/alpine/csc314/scratch/adams/petsc/src/snes/tutorials$ *mpicc
>>>>>>> --version*
>>>>>>>
>>>>>>> *nvc 21.7-0 linuxpower target on Linuxpower*
>>>>>>> NVIDIA Compilers and Tools
>>>>>>> Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights
>>>>>>> reserved.
>>>>>>> 19:40 main=
>>>>>>> /gpfs/alpine/csc314/scratch/adams/petsc/src/snes/tutorials$ jsrun -n 1
>>>>>>> ./ex1 -ksp_monitor
>>>>>>>     0 KSP Residual norm 6.041522986797e+00
>>>>>>>     1 KSP Residual norm 1.042493382631e+00
>>>>>>>     2 KSP Residual norm 7.950907844730e-16
>>>>>>>     0 KSP Residual norm 4.786756692342e+00
>>>>>>>     1 KSP Residual norm 1.426392207750e-01
>>>>>>>     2 KSP Residual norm 1.801079604472e-15
>>>>>>>     0 KSP Residual norm 2.986456323228e+00
>>>>>>>     1 KSP Residual norm 7.669888809223e-02
>>>>>>>     2 KSP Residual norm 3.744083117256e-16
>>>>>>>     0 KSP Residual norm 2.306244667700e-01
>>>>>>>     1 KSP Residual norm 1.355550749587e-02
>>>>>>>     2 KSP Residual norm 5.845524837731e-17
>>>>>>>     0 KSP Residual norm 1.936314002654e-03
>>>>>>>     1 KSP Residual norm 2.125593590819e-04
>>>>>>>     2 KSP Residual norm 6.987141455073e-20
>>>>>>>     0 KSP Residual norm 1.435593531990e-07
>>>>>>>     1 KSP Residual norm 2.588271385567e-08
>>>>>>>     2 KSP Residual norm 3.942196167935e-23
>>>>>>>
>>>>>>>
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