I see. crazy graph of compiler flags. OK, nothing critical. GNU works fine and the app that I support has given up on nvhpc also (don't know why). On Thu, Nov 4, 2021 at 9:08 PM Barry Smith <[email protected]> wrote:

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 <[email protected]> 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 <[email protected]> wrote:

...

Need the same thing for the C++ preprocessor flag

On Nov 4, 2021, at 5:44 PM, Mark Adams <[email protected]> wrote:

It gets a lot further.

On Thu, Nov 4, 2021 at 5:32 PM Mark Adams <[email protected]> wrote:

...

OK, sorry I missed the CPPFLAGS. It is running now. Thanks,

On Thu, Nov 4, 2021 at 4:43 PM Satish Balay <[email protected]> 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 <[email protected]> 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 <[email protected]> wrote:

Ah, CCFLAGS does not seem to work.

On Thu, Nov 4, 2021 at 3:07 PM Barry Smith <[email protected]> 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 <[email protected]> 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>