[petsc-dev] I am getting this error ...

[Barry Smith]

   This comes from the persistent problem with PETSc's make system using too many flags for compiling CUDA that have not been tested by configure. See below the -mp=gpu is provided probably from the CPPFLAGS or CXXPPFLAGS(sp) that is improperly used by the PETSc makefiles to compile CUDA code! 


Using CUDA compile: /global/common/software/nersc/cos1.3/cuda/11.3.0/bin/nvcc -o .o -I/opt/cray/pe/mpich/8.1.10/ofi/nvidia/20.7/include -I/opt/cray/pe/libsci/21.08.1.2/NVIDIA/20.7/x86_64/include -I/opt/cray/pe/pmi/6.0.14/include -I/opt/cray/pe/dsmml/0.2.2/dsmml//include -I/opt/cray/xpmem/2.2.40-7.0.1.0_3.1__g1d7a24d.shasta/include  -g -Xcompiler -rdynamic -DLANDAU_DIM=2 -DLANDAU_MAX_SPECIES=10 -DLANDAU_MAX_Q=4 -Xcompiler -fPIC -std=c++17 -gencode arch=compute_80,code=sm_80  -Wno-deprecated-gpu-targets  -c --compiler-options=-I/global/homes/m/madams/petsc/include -I/global/homes/m/madams/petsc/arch-perlmutter-opt-nvidia-cuda/include -I/global/common/software/nersc/cos1.3/cuda/11.3.0/include -mp=gpu -I/global/homes/m/madams/petsc/include -I/global/homes/m/madams/petsc/arch-perlmutter-opt-nvidia-cuda/include -I/global/common/software/nersc/cos1.3/cuda/11.3.0/include 



> On Nov 4, 2021, at 7:31 PM, Mark Adams <mfadams at lbl.gov> wrote:
> 
> OK, configure is done.
> Maybe I have too many -mp=gpu
> 
>        CUDAC arch-perlmutter-opt-nvidia-cuda/obj/sys/classes/random/impls/curand/curand2.o
> gcc: error: unrecognized command line option ‘-mp=gpu’; did you mean ‘-mpku’?
> 
> On Thu, Nov 4, 2021 at 5:51 PM Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
> 
>   Need the same thing for the C++ preprocessor flag
> 
> 
> 
>> On Nov 4, 2021, at 5:44 PM, Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> wrote:
>> 
>> It gets a lot further.
>> 
>> On Thu, Nov 4, 2021 at 5:32 PM Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> wrote:
>> OK, sorry I missed the CPPFLAGS. It is running now.
>> Thanks,
>> 
>> On Thu, Nov 4, 2021 at 4:43 PM Satish Balay <balay at mcs.anl.gov <mailto:balay at mcs.anl.gov>> wrote:
>> Multiple e-mail threads on the same issue (:
>> 
>> As suggested in my earlier thread - add -mp=gpu to both CPPFLAGS and CFLAGS [or LDFLAGS]
>> 
>> Satish
>> 
>> -------
>> Executing: cc  -o /tmp/petsc-Vvs8_T/config.setCompilers/conftest   -g -DLANDAU_DIM=2 -DLANDAU_MAX_SPECIES=10 -DLANDAU_MAX_Q=4 /tmp/petsc-Vvs8_T/config.setCompilers/conftest.o
>> Possible ERROR while running linker:
>> stderr:
>> nvc-Warning-The -gpu option has no effect unless a language-specific option to enable GPU code generation is used (e.g.: -acc, -mp=gpu, -stdpar, -cuda)
>> 
>> 
>> On Thu, 4 Nov 2021, Mark Adams wrote:
>> 
>> > It is CPPFLAGS. I seem to get the same behavior.
>> > 
>> > FWIW, I did get this response from NERSc but I don't know how to interpret
>> > it.
>> > 
>> > He seems to be saying that I don't need -mp=gpu for the device compiler
>> > (nvcc). He seems to think that I am adding -gpu.
>> > 
>> > nvcc -- The device compiler does not need any of those flags because it
>> > already knows that it's being fed cuda code. The warning you're seeing is
>> > coming from nvc (which is the host / CPU side compiler) if you're in the
>> > PrgEnv-nvidia environment. You should not need to add -mp=gpu and -cuda,
>> > please just add the -cuda flag (to your host code) not to the device code.
>> > 
>> > I will try to talk with this guy again.
>> > 
>> > Thanks,
>> > 
>> > 
>> > On Thu, Nov 4, 2021 at 4:11 PM Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
>> > 
>> > >
>> > >   Yes, you need to use the CPPFLAGS which maybe called CPPCFLAGS I am not
>> > > sure
>> > >
>> > >
>> > > On Nov 4, 2021, at 3:23 PM, Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> wrote:
>> > >
>> > > Ah, CCFLAGS does not seem to work.
>> > >
>> > > On Thu, Nov 4, 2021 at 3:07 PM Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
>> > >
>> > >>
>> > >>   You have to pass in the flag to turn off the bitching about -gpu to the
>> > >> C preprocessor, not the C compiler.
>> > >>
>> > >>
>> > >> stderr:
>> > >> nvc-Warning-The -gpu option has no effect unless a language-specific
>> > >> option to enable GPU code generation is used (e.g.: -acc, -mp=gpu, -stdpar,
>> > >> -cuda)
>> > >> Source:
>> > >> #include "confdefs.h"
>> > >> #include "conffix.h"
>> > >> #include <stdlib.h>
>> > >>
>> > >>
>> > >>
>> > >> > On Nov 4, 2021, at 2:49 PM, Mark Adams <mfadams at lbl.gov <mailto:mfadams at lbl.gov>> wrote:
>> > >> >
>> > >> > on Perlmutter with nvhpc:
>> > >> >
>> > >> >               Defined make macro "CPP" to "cc --use cpp32"
>> > >> > Preprocessing source:
>> > >> > #include "confdefs.h"
>> > >> > #include "conffix.h"
>> > >> > #include <stdlib.h>
>> > >> >
>> > >> > Executing: cc --use cpp32  -I/tmp/petsc-jV9U1b/config.setCompilers
>> > >> /tmp/petsc-jV9U1b/config.setCompilers/conftest.c
>> > >> > Possible ERROR while running preprocessor: exit code 1
>> > >> > stderr:
>> > >> > nvc-Error-Unknown switch: --use
>> > >> > Source:
>> > >> > <configure.log>
>> > >>
>> > >> <configure.log>
>> > >
>> > >
>> > >
>> > 
>> 
>> <configure.log>
> 
> <make.log><configure.log>

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