[petsc-users] one compilation error in PETSc-dev with enabling GPU and complex number

Matthew Knepley knepley at gmail.com
Sun Jan 29 13:00:43 CST 2012 

On Sun, Jan 29, 2012 at 12:53 PM, recrusader <recrusader at gmail.com> wrote:

> Dear PETSc developers,
>
> With your help, I can successfully PETSc-deve with enabling GPU and
> complex number.
> However, when I compiled the codes, I met some errors. I also tried to
> use simple codes to realize the same function. However, the errors
> disappear. One example is as follows:
>
> for the function "VecScale_SeqCUSP"
> "#undef __FUNCT__
> #define __FUNCT__ "VecScale_SeqCUSP"
> PetscErrorCode VecScale_SeqCUSP(Vec xin, PetscScalar alpha)
> {
>  CUSPARRAY      *xarray;
>  PetscErrorCode ierr;
>
>  PetscFunctionBegin;
>  if (alpha == 0.0) {
>    ierr = VecSet_SeqCUSP(xin,alpha);CHKERRQ(ierr);
>  } else if (alpha != 1.0) {
>    ierr = VecCUSPGetArrayReadWrite(xin,&xarray);CHKERRQ(ierr);
>    try {
>      cusp::blas::scal(*xarray,alpha);
>    } catch(char* ex) {
>      SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"CUSP error: %s", ex);
>    }
>    ierr = VecCUSPRestoreArrayReadWrite(xin,&xarray);CHKERRQ(ierr);
>  }
>  ierr = WaitForGPU();CHKERRCUSP(ierr);
>  ierr = PetscLogFlops(xin->map->n);CHKERRQ(ierr);
>  PetscFunctionReturn(0);
> } "
>
> When I compiled PETSc-dev, I met the following errors:
> " /opt/apps/cuda/4.0/cuda/include/cusp/detail/blas.inl(134): warning:
> calling a __host__ function from a __host__ __device__ function is not
> allowed
>          detected during:
>            instantiation of "void
> cusp::blas::detail::SCAL<T>::operator()(T2 &) [with
> T=std::complex<double>, T2=PetscScalar]"
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/for_each.inl(72):
> here
>            instantiation of "void
> thrust::detail::device::cuda::for_each_n_closure<RandomAccessIterator,
> Size, UnaryFunction>::operator()() [with
>
> RandomAccessIterator=thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> Size=long, UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
>
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(51):
> here
>            instantiation of "void
>
> thrust::detail::device::cuda::detail::launch_closure_by_value(NullaryFunction)
> [with
> NullaryFunction=thrust::detail::device::cuda::for_each_n_closure<thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> long, cusp::blas::detail::SCAL<std::complex<double>>>]"
>
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(71):
> here
>            instantiation of "size_t
>
> thrust::detail::device::cuda::detail::closure_launcher_base<NullaryFunction,
> launch_by_value>::block_size_with_maximal_occupancy(size_t) [with
>
> NullaryFunction=thrust::detail::device::cuda::for_each_n_closure<thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> long, cusp::blas::detail::SCAL<std::complex<double>>>,
> launch_by_value=true]"
>
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(136):
> here
>            instantiation of "thrust::pair<size_t, size_t>
>
> thrust::detail::device::cuda::detail::closure_launcher<NullaryFunction>::configuration_with_maximal_occupancy(Size)
> [with
> NullaryFunction=thrust::detail::device::cuda::for_each_n_closure<thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> long, cusp::blas::detail::SCAL<std::complex<double>>>, Size=long]"
>
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(145):
> here
>            [ 6 instantiation contexts not shown ]
>            instantiation of "InputIterator
> thrust::detail::dispatch::for_each(InputIterator, InputIterator,
> UnaryFunction, thrust::device_space_tag) [with
>
> InputIterator=thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/for_each.inl(51): here
>            instantiation of "InputIterator
> thrust::detail::for_each(InputIterator, InputIterator, UnaryFunction)
> [with
> InputIterator=thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/for_each.inl(67): here
>            instantiation of "void thrust::for_each(InputIterator,
> InputIterator, UnaryFunction) [with
>
> InputIterator=thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> (367): here
>            instantiation of "void
> cusp::blas::detail::scal(ForwardIterator, ForwardIterator, ScalarType)
> [with
> ForwardIterator=thrust::detail::normal_iterator<thrust::device_ptr<PetscScalar>>,
> ScalarType=std::complex<double>]"
> (748): here
>            instantiation of "void cusp::blas::scal(Array &,
> ScalarType) [with Array=cusp::array1d<PetscScalar,
> cusp::device_memory>, ScalarType=std::complex<double>]"
> veccusp.cu(1185): here
>
>
> /opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(51):
> error: a value of type "int" cannot be assigned to an entity of type
> "_ZNSt7complexIdE9_ComplexTE"
>
> "
> However, I further realize simiar codes as
> "
> #include <thrust/version.h>
> #include <cusp/version.h>
> #include <iostream>
> #include <cusp/blas.h>
> #include <cusp/array1d.h>
> #include <complex>
>
> int main(void)
> {
>    cusp::array1d<std::complex<double>, cusp::host_memory> *x;
>
>    x=new cusp::array1d<std::complex<double>, cusp::host_memory>(2,0.0);
>
>    std::complex<double> alpha(1,2.0);
>    cusp::blas::scal(*x,alpha);
>
>    return 0;
> }
> "
>
> When I complied it using  "nvcc gputest.cu -o gputest", I only meet
> warning information as follows:
> "
> /opt/apps/cuda/4.0/cuda/bin/../include/cusp/detail/blas.inl(134):
> warning: calling a __host__ function from a __host__ __device__
> function is not allowed
>          detected during:
>            instantiation of "void
> cusp::blas::detail::SCAL<T>::operator()(T2 &) [with
> T=std::complex<double>, T2=std::complex<double>]"
> /opt/apps/cuda/4.0/cuda/bin/../include/thrust/detail/host/for_each.inl(37):
> here
>            instantiation of "InputIterator
> thrust::detail::host::for_each(InputIterator, InputIterator,
> UnaryFunction) [with
> InputIterator=thrust::detail::normal_iterator<std::complex<double> *>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
>
> /opt/apps/cuda/4.0/cuda/bin/../include/thrust/detail/dispatch/for_each.h(46):
> here
>            instantiation of "InputIterator
> thrust::detail::dispatch::for_each(InputIterator, InputIterator,
> UnaryFunction, thrust::host_space_tag) [with
> InputIterator=thrust::detail::normal_iterator<std::complex<double> *>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> /opt/apps/cuda/4.0/cuda/bin/../include/thrust/detail/for_each.inl(51): here
>            instantiation of "InputIterator
> thrust::detail::for_each(InputIterator, InputIterator, UnaryFunction)
> [with InputIterator=thrust::detail::normal_iterator<std::complex<double>
> *>, UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> /opt/apps/cuda/4.0/cuda/bin/../include/thrust/detail/for_each.inl(67): here
>            instantiation of "void thrust::for_each(InputIterator,
> InputIterator, UnaryFunction) [with
> InputIterator=thrust::detail::normal_iterator<std::complex<double> *>,
> UnaryFunction=cusp::blas::detail::SCAL<std::complex<double>>]"
> (367): here
>            instantiation of "void
> cusp::blas::detail::scal(ForwardIterator, ForwardIterator, ScalarType)
> [with ForwardIterator=thrust::detail::normal_iterator<std::complex<double>
> *>, ScalarType=std::complex<double>]"
> (748): here
>            instantiation of "void cusp::blas::scal(Array &,
> ScalarType) [with Array=cusp::array1d<std::complex<double>,
> cusp::host_memory>, ScalarType=std::complex<double>]"
> gputest.cu(25): here
>
> "
> There are not errors like
>
> "/opt/apps/cuda/4.0/cuda/include/thrust/detail/device/cuda/detail/launch_closure.inl(51):
> error: a value of type "int" cannot be assigned to an entity of type
> "_ZNSt7complexIdE9_ComplexTE" "
>
> Furthermore, the warning information is also different between
> PETSc-dev and simple codes.
>
> Could you give me some suggestion for this errors? Thank you very much.
>

The headers are complicated to get right. The whole point of what we did is
to give a way to use GPU
simply through the existing PETSc linear algebra interface.

   Matt


> Best,
> Yujie
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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