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dealii - remove duplicate GPU vec allocations #1652

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Aug 30, 2024
Merged

dealii - remove duplicate GPU vec allocations #1652

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2097acd
dealii - remove duplicate GPU vec allocations
jeremylt Aug 29, 2024
0850f99
dealii - update array handling method names
jeremylt Aug 30, 2024
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84 changes: 61 additions & 23 deletions examples/deal.II/bps.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,8 @@
#include <deal.II/matrix_free/tools.h>

// libCEED includes
#include <ceed/ceed.h>
#include <ceed.h>
#include <ceed/backend.h>

// QFunction source
#include "bps-qfunctions.h"
Expand Down Expand Up @@ -160,6 +161,8 @@ class OperatorCeed : public OperatorBase<Number>
*/
~OperatorCeed()
{
CeedVectorDestroy(&src_ceed);
CeedVectorDestroy(&dst_ceed);
CeedOperatorDestroy(&op_apply);
CeedDestroy(&ceed);
}
Expand Down Expand Up @@ -302,7 +305,11 @@ class OperatorCeed : public OperatorBase<Number>
CeedOperatorSetField(op_apply, "qdata", q_data_restriction, CEED_BASIS_NONE, q_data);
CeedOperatorSetField(op_apply, "v", sol_restriction, sol_basis, CEED_VECTOR_ACTIVE);

// 7) cleanup
// 7) libCEED vectors
CeedElemRestrictionCreateVector(sol_restriction, &src_ceed, NULL);
CeedElemRestrictionCreateVector(sol_restriction, &dst_ceed, NULL);

// 8) cleanup
CeedVectorDestroy(&q_data);
CeedElemRestrictionDestroy(&q_data_restriction);
CeedElemRestrictionDestroy(&sol_restriction);
Expand All @@ -322,30 +329,43 @@ class OperatorCeed : public OperatorBase<Number>

if (dof_handler.get_fe().n_components() == 1)
{
// create libCEED view on deal.II vectors
VectorTypeCeed src_ceed(ceed, src);
VectorTypeCeed dst_ceed(ceed, dst);
// pass memory buffers to libCEED
VectorTypeCeed x(src_ceed);
VectorTypeCeed y(dst_ceed);
x.set_array(src);
y.set_array(dst);

// apply operator
CeedOperatorApply(op_apply, src_ceed(), dst_ceed(), CEED_REQUEST_IMMEDIATE);
CeedOperatorApply(op_apply, x(), y(), CEED_REQUEST_IMMEDIATE);

// pull arrays back to deal.II
x.sync_to_host();
y.sync_to_host();
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}
else // TODO: needed for multiple components
{
// allocate space for block vectors
src_tmp.reinit(this->extended_local_size(), true);
dst_tmp.reinit(this->extended_local_size(), true);

copy_to_block_vector(src_tmp, src); // copy to block vector
// copy to block vector
copy_to_block_vector(src_tmp, src);

// create libCEED view on deal.II vectors
VectorTypeCeed src_ceed(ceed, src_tmp);
VectorTypeCeed dst_ceed(ceed, dst_tmp);
// pass memory buffers to libCEED
VectorTypeCeed x(src_ceed);
VectorTypeCeed y(dst_ceed);
x.set_array(src_tmp);
y.set_array(dst_tmp);

// apply operator
CeedOperatorApply(op_apply, src_ceed(), dst_ceed(), CEED_REQUEST_IMMEDIATE);
CeedOperatorApply(op_apply, x(), y(), CEED_REQUEST_IMMEDIATE);

dst_ceed.sync_to_host(); // pull libCEED data back to host
copy_from_block_vector(dst, dst_tmp); // copy from block vector
// pull arrays back to deal.II
x.sync_to_host();
y.sync_to_host();

// copy from block vector
copy_from_block_vector(dst, dst_tmp);
}

// communicate: compress
Expand Down Expand Up @@ -373,9 +393,14 @@ class OperatorCeed : public OperatorBase<Number>
{
this->initialize_dof_vector(diagonal);

VectorTypeCeed diagonal_ceed(ceed, diagonal);
// pass memory buffer to libCEED
VectorTypeCeed y(dst_ceed);
y.set_array(diagonal);

CeedOperatorLinearAssembleDiagonal(op_apply, y(), CEED_REQUEST_IMMEDIATE);

CeedOperatorLinearAssembleDiagonal(op_apply, diagonal_ceed(), CEED_REQUEST_IMMEDIATE);
// pull array back to deal.II
y.sync_to_host();

const unsigned int n_components = dof_handler.get_fe().n_components();

Expand Down Expand Up @@ -404,13 +429,10 @@ class OperatorCeed : public OperatorBase<Number>
/**
* Constructor.
*/
VectorTypeCeed(const Ceed &ceed, const VectorType &vec)
VectorTypeCeed(const CeedVector &vec_orig)
{
const unsigned int n_dofs =
vec.get_partitioner()->locally_owned_size() + vec.get_partitioner()->n_ghost_indices();

CeedVectorCreate(ceed, n_dofs, &vec_ceed);
CeedVectorSetArray(vec_ceed, CEED_MEM_HOST, CEED_USE_POINTER, vec.get_values());
vec_ceed = NULL;
CeedVectorReferenceCopy(vec_orig, &vec_ceed);
}

/**
Expand All @@ -422,6 +444,15 @@ class OperatorCeed : public OperatorBase<Number>
return vec_ceed;
}

/**
* Set deal.II memory in libCEED vector.
*/
void
set_array(const VectorType &vec)
{
CeedVectorSetArray(vec_ceed, CEED_MEM_HOST, CEED_USE_POINTER, vec.get_values());
}

/**
* Sync memory from device to host.
*/
Expand All @@ -436,8 +467,13 @@ class OperatorCeed : public OperatorBase<Number>
*/
~VectorTypeCeed()
{
CeedScalar *ptr;
CeedVectorTakeArray(vec_ceed, CEED_MEM_HOST, &ptr);
bool has_array;
CeedVectorHasBorrowedArrayOfType(vec_ceed, CEED_MEM_HOST, &has_array);
if (has_array)
{
CeedScalar *ptr;
CeedVectorTakeArray(vec_ceed, CEED_MEM_HOST, &ptr);
}
CeedVectorDestroy(&vec_ceed);
}

Expand Down Expand Up @@ -705,6 +741,8 @@ class OperatorCeed : public OperatorBase<Number>
Ceed ceed;
std::vector<double> weights;
std::array<CeedInt, 3> strides;
CeedVector src_ceed;
CeedVector dst_ceed;
CeedOperator op_apply;

/**
Expand Down