/usr/include/viennacl/backend/memory.hpp is in libviennacl-dev 1.5.1-1.
This file is owned by root:root, with mode 0o644.
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#define VIENNACL_BACKEND_MEMORY_HPP
/* =========================================================================
Copyright (c) 2010-2014, Institute for Microelectronics,
Institute for Analysis and Scientific Computing,
TU Wien.
Portions of this software are copyright by UChicago Argonne, LLC.
-----------------
ViennaCL - The Vienna Computing Library
-----------------
Project Head: Karl Rupp rupp@iue.tuwien.ac.at
(A list of authors and contributors can be found in the PDF manual)
License: MIT (X11), see file LICENSE in the base directory
============================================================================= */
/** @file viennacl/backend/memory.hpp
@brief Main interface routines for memory management
*/
#include <vector>
#include <cassert>
#include "viennacl/forwards.h"
#include "viennacl/backend/mem_handle.hpp"
#include "viennacl/context.hpp"
#include "viennacl/traits/handle.hpp"
#include "viennacl/traits/context.hpp"
#include "viennacl/backend/util.hpp"
#include "viennacl/backend/cpu_ram.hpp"
#ifdef VIENNACL_WITH_OPENCL
#include "viennacl/backend/opencl.hpp"
#include "viennacl/ocl/backend.hpp"
#endif
#ifdef VIENNACL_WITH_CUDA
#include "viennacl/backend/cuda.hpp"
#endif
namespace viennacl
{
namespace backend
{
// if a user compiles with CUDA, it is reasonable to expect that CUDA should be the default
/** @brief Synchronizes the execution. finish() will only return after all compute kernels (CUDA, OpenCL) have completed. */
inline void finish()
{
#ifdef VIENNACL_WITH_CUDA
cudaDeviceSynchronize();
#endif
#ifdef VIENNACL_WITH_OPENCL
viennacl::ocl::get_queue().finish();
#endif
}
// Requirements for backend:
// ---- Memory ----
//
// * memory_create(size, host_ptr)
// * memory_copy(src, dest, offset_src, offset_dest, size)
// * memory_write(src, offset, size, ptr)
// * memory_read(src, offset, size, ptr)
//
/** @brief Creates an array of the specified size. If the second argument is provided, the buffer is initialized with data from that pointer.
*
* This is the generic version for CPU RAM, CUDA, and OpenCL. Creates the memory in the currently active memory domain.
*
* @param handle The generic wrapper handle for multiple memory domains which will hold the new buffer.
* @param size_in_bytes Number of bytes to allocate
* @param ctx Optional context in which the matrix is created (one out of multiple OpenCL contexts, CUDA, host)
* @param host_ptr Pointer to data which will be copied to the new array. Must point to at least 'size_in_bytes' bytes of data.
*
*/
inline void memory_create(mem_handle & handle, vcl_size_t size_in_bytes, viennacl::context const & ctx, const void * host_ptr = NULL)
{
if (size_in_bytes > 0)
{
if (handle.get_active_handle_id() == MEMORY_NOT_INITIALIZED)
handle.switch_active_handle_id(ctx.memory_type());
switch(handle.get_active_handle_id())
{
case MAIN_MEMORY:
handle.ram_handle() = cpu_ram::memory_create(size_in_bytes, host_ptr);
handle.raw_size(size_in_bytes);
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
handle.opencl_handle().context(ctx.opencl_context());
handle.opencl_handle() = opencl::memory_create(handle.opencl_handle().context(), size_in_bytes, host_ptr);
handle.raw_size(size_in_bytes);
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
handle.cuda_handle() = cuda::memory_create(size_in_bytes, host_ptr);
handle.raw_size(size_in_bytes);
break;
#endif
case MEMORY_NOT_INITIALIZED:
throw memory_exception("not initialised!");
default:
throw memory_exception("unknown memory handle!");
}
}
}
/*
inline void memory_create(mem_handle & handle, vcl_size_t size_in_bytes, const void * host_ptr = NULL)
{
viennacl::context ctx(default_memory_type());
memory_create(handle, size_in_bytes, ctx, host_ptr);
}*/
/** @brief Copies 'bytes_to_copy' bytes from address 'src_buffer + src_offset' to memory starting at address 'dst_buffer + dst_offset'.
*
* This is the generic version for CPU RAM, CUDA, and OpenCL. Copies the memory in the currently active memory domain.
*
*
* @param src_buffer A smart pointer to the begin of an allocated buffer
* @param dst_buffer A smart pointer to the end of an allocated buffer
* @param src_offset Offset of the first byte to be written from the address given by 'src_buffer' (in bytes)
* @param dst_offset Offset of the first byte to be written to the address given by 'dst_buffer' (in bytes)
* @param bytes_to_copy Number of bytes to be copied
*/
inline void memory_copy(mem_handle const & src_buffer,
mem_handle & dst_buffer,
vcl_size_t src_offset,
vcl_size_t dst_offset,
vcl_size_t bytes_to_copy)
{
assert( src_buffer.get_active_handle_id() == dst_buffer.get_active_handle_id() && bool("memory_copy() must be called on buffers from the same domain") );
if (bytes_to_copy > 0)
{
switch(src_buffer.get_active_handle_id())
{
case MAIN_MEMORY:
cpu_ram::memory_copy(src_buffer.ram_handle(), dst_buffer.ram_handle(), src_offset, dst_offset, bytes_to_copy);
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
opencl::memory_copy(src_buffer.opencl_handle(), dst_buffer.opencl_handle(), src_offset, dst_offset, bytes_to_copy);
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
cuda::memory_copy(src_buffer.cuda_handle(), dst_buffer.cuda_handle(), src_offset, dst_offset, bytes_to_copy);
break;
#endif
case MEMORY_NOT_INITIALIZED:
throw memory_exception("not initialised!");
default:
throw memory_exception("unknown memory handle!");
}
}
}
// TODO: Refine this concept. Maybe move to constructor?
/** @brief A 'shallow' copy operation from an initialized buffer to an uninitialized buffer.
* The uninitialized buffer just copies the raw handle.
*/
inline void memory_shallow_copy(mem_handle const & src_buffer,
mem_handle & dst_buffer)
{
assert( (dst_buffer.get_active_handle_id() == MEMORY_NOT_INITIALIZED) && bool("Shallow copy on already initialized memory not supported!"));
switch(src_buffer.get_active_handle_id())
{
case MAIN_MEMORY:
dst_buffer.switch_active_handle_id(src_buffer.get_active_handle_id());
dst_buffer.ram_handle() = src_buffer.ram_handle();
dst_buffer.raw_size(src_buffer.raw_size());
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
dst_buffer.switch_active_handle_id(src_buffer.get_active_handle_id());
dst_buffer.opencl_handle() = src_buffer.opencl_handle();
dst_buffer.raw_size(src_buffer.raw_size());
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
dst_buffer.switch_active_handle_id(src_buffer.get_active_handle_id());
dst_buffer.cuda_handle() = src_buffer.cuda_handle();
dst_buffer.raw_size(src_buffer.raw_size());
break;
#endif
case MEMORY_NOT_INITIALIZED:
throw memory_exception("not initialised!");
default:
throw memory_exception("unknown memory handle!");
}
}
/** @brief Writes data from main RAM identified by 'ptr' to the buffer identified by 'dst_buffer'
*
* This is the generic version for CPU RAM, CUDA, and OpenCL. Writes the memory in the currently active memory domain.
*
* @param dst_buffer A smart pointer to the beginning of an allocated buffer
* @param dst_offset Offset of the first written byte from the beginning of 'dst_buffer' (in bytes)
* @param bytes_to_write Number of bytes to be written
* @param ptr Pointer to the first byte to be written
* @param async Whether the operation should be asynchronous
*/
inline void memory_write(mem_handle & dst_buffer,
vcl_size_t dst_offset,
vcl_size_t bytes_to_write,
const void * ptr,
bool async = false)
{
if (bytes_to_write > 0)
{
switch(dst_buffer.get_active_handle_id())
{
case MAIN_MEMORY:
cpu_ram::memory_write(dst_buffer.ram_handle(), dst_offset, bytes_to_write, ptr, async);
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
opencl::memory_write(dst_buffer.opencl_handle(), dst_offset, bytes_to_write, ptr, async);
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
cuda::memory_write(dst_buffer.cuda_handle(), dst_offset, bytes_to_write, ptr, async);
break;
#endif
case MEMORY_NOT_INITIALIZED:
throw memory_exception("not initialised!");
default:
throw memory_exception("unknown memory handle!");
}
}
}
/** @brief Reads data from a buffer back to main RAM.
*
* This is the generic version for CPU RAM, CUDA, and OpenCL. Reads the memory from the currently active memory domain.
*
* @param src_buffer A smart pointer to the beginning of an allocated source buffer
* @param src_offset Offset of the first byte to be read from the beginning of src_buffer (in bytes_
* @param bytes_to_read Number of bytes to be read
* @param ptr Location in main RAM where to read data should be written to
* @param async Whether the operation should be asynchronous
*/
inline void memory_read(mem_handle const & src_buffer,
vcl_size_t src_offset,
vcl_size_t bytes_to_read,
void * ptr,
bool async = false)
{
//finish(); //Fixes some issues with AMD APP SDK. However, might sacrifice a few percents of performance in some cases.
if (bytes_to_read > 0)
{
switch(src_buffer.get_active_handle_id())
{
case MAIN_MEMORY:
cpu_ram::memory_read(src_buffer.ram_handle(), src_offset, bytes_to_read, ptr, async);
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
opencl::memory_read(src_buffer.opencl_handle(), src_offset, bytes_to_read, ptr, async);
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
cuda::memory_read(src_buffer.cuda_handle(), src_offset, bytes_to_read, ptr, async);
break;
#endif
case MEMORY_NOT_INITIALIZED:
throw memory_exception("not initialised!");
default:
throw memory_exception("unknown memory handle!");
}
}
}
namespace detail
{
template <typename T>
vcl_size_t element_size(memory_types /* mem_type */)
{
return sizeof(T);
}
template <>
inline vcl_size_t element_size<unsigned long>(memory_types
#ifdef VIENNACL_WITH_OPENCL
mem_type //in order to compile cleanly at -Wextra in GCC
#endif
)
{
#ifdef VIENNACL_WITH_OPENCL
if (mem_type == OPENCL_MEMORY)
return sizeof(cl_ulong);
#endif
return sizeof(unsigned long);
}
template <>
inline vcl_size_t element_size<long>(memory_types
#ifdef VIENNACL_WITH_OPENCL
mem_type //in order to compile cleanly at -Wextra in GCC
#endif
)
{
#ifdef VIENNACL_WITH_OPENCL
if (mem_type == OPENCL_MEMORY)
return sizeof(cl_long);
#endif
return sizeof(long);
}
template <>
inline vcl_size_t element_size<unsigned int>(memory_types
#ifdef VIENNACL_WITH_OPENCL
mem_type //in order to compile cleanly at -Wextra in GCC
#endif
)
{
#ifdef VIENNACL_WITH_OPENCL
if (mem_type == OPENCL_MEMORY)
return sizeof(cl_uint);
#endif
return sizeof(unsigned int);
}
template <>
inline vcl_size_t element_size<int>(memory_types
#ifdef VIENNACL_WITH_OPENCL
mem_type //in order to compile cleanly at -Wextra in GCC
#endif
)
{
#ifdef VIENNACL_WITH_OPENCL
if (mem_type == OPENCL_MEMORY)
return sizeof(cl_int);
#endif
return sizeof(int);
}
}
/** @brief Switches the active memory domain within a memory handle. Data is copied if the new active domain differs from the old one. Memory in the source handle is not free'd. */
template <typename DataType>
void switch_memory_context(mem_handle & handle, viennacl::context new_ctx)
{
if (handle.get_active_handle_id() == new_ctx.memory_type())
return;
if (handle.get_active_handle_id() == viennacl::MEMORY_NOT_INITIALIZED || handle.raw_size() == 0)
{
handle.switch_active_handle_id(new_ctx.memory_type());
#ifdef VIENNACL_WITH_OPENCL
if (new_ctx.memory_type() == OPENCL_MEMORY)
handle.opencl_handle().context(new_ctx.opencl_context());
#endif
return;
}
vcl_size_t size_dst = detail::element_size<DataType>(handle.get_active_handle_id());
vcl_size_t size_src = detail::element_size<DataType>(new_ctx.memory_type());
if (size_dst != size_src) // OpenCL data element size not the same as host data element size
{
throw "Heterogeneous data element sizes not yet supported!";
}
else //no data conversion required
{
if (handle.get_active_handle_id() == MAIN_MEMORY) //we can access the existing data directly
{
switch (new_ctx.memory_type())
{
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
handle.opencl_handle().context(new_ctx.opencl_context());
handle.opencl_handle() = opencl::memory_create(handle.opencl_handle().context(), handle.raw_size(), handle.ram_handle().get());
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
handle.cuda_handle() = cuda::memory_create(handle.raw_size(), handle.ram_handle().get());
break;
#endif
case MAIN_MEMORY:
default:
throw "Invalid destination domain";
}
}
#ifdef VIENNACL_WITH_OPENCL
else if (handle.get_active_handle_id() == OPENCL_MEMORY) // data can be dumped into destination directly
{
std::vector<DataType> buffer;
switch (new_ctx.memory_type())
{
case MAIN_MEMORY:
handle.ram_handle() = cpu_ram::memory_create(handle.raw_size());
opencl::memory_read(handle.opencl_handle(), 0, handle.raw_size(), handle.ram_handle().get());
break;
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
buffer.resize(handle.raw_size() / sizeof(DataType));
opencl::memory_read(handle.opencl_handle(), 0, handle.raw_size(), &(buffer[0]));
cuda::memory_create(handle.cuda_handle(), handle.raw_size(), &(buffer[0]));
break;
#endif
default:
throw "Invalid destination domain";
}
}
#endif
#ifdef VIENNACL_WITH_CUDA
else //CUDA_MEMORY
{
std::vector<DataType> buffer;
// write
switch (new_ctx.memory_type())
{
case MAIN_MEMORY:
handle.ram_handle() = cpu_ram::memory_create(handle.raw_size());
cuda::memory_read(handle.cuda_handle(), 0, handle.raw_size(), handle.ram_handle().get());
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
buffer.resize(handle.raw_size() / sizeof(DataType));
cuda::memory_read(handle.cuda_handle(), 0, handle.raw_size(), &(buffer[0]));
handle.opencl_handle() = opencl::memory_create(handle.raw_size(), &(buffer[0]));
break;
#endif
default:
throw "Unsupported source memory domain";
}
}
#endif
// everything succeeded so far, now switch to new domain:
handle.switch_active_handle_id(new_ctx.memory_type());
} // no data conversion
}
/** @brief Copies data of the provided 'DataType' from 'handle_src' to 'handle_dst' and converts the data if the binary representation of 'DataType' among the memory domains differs. */
template <typename DataType>
void typesafe_memory_copy(mem_handle const & handle_src, mem_handle & handle_dst)
{
if (handle_dst.get_active_handle_id() == MEMORY_NOT_INITIALIZED)
handle_dst.switch_active_handle_id(default_memory_type());
vcl_size_t element_size_src = detail::element_size<DataType>(handle_src.get_active_handle_id());
vcl_size_t element_size_dst = detail::element_size<DataType>(handle_dst.get_active_handle_id());
if (element_size_src != element_size_dst)
{
// Data needs to be converted.
typesafe_host_array<DataType> buffer_src(handle_src);
typesafe_host_array<DataType> buffer_dst(handle_dst, handle_src.raw_size() / element_size_src);
//
// Step 1: Fill buffer_dst depending on where the data resides:
//
DataType const * src_data;
switch (handle_src.get_active_handle_id())
{
case MAIN_MEMORY:
src_data = reinterpret_cast<DataType const *>(handle_src.ram_handle().get());
for (vcl_size_t i=0; i<buffer_dst.size(); ++i)
buffer_dst.set(i, src_data[i]);
break;
#ifdef VIENNACL_WITH_OPENCL
case OPENCL_MEMORY:
buffer_src.resize(handle_src, handle_src.raw_size() / element_size_src);
opencl::memory_read(handle_src.opencl_handle(), 0, buffer_src.raw_size(), buffer_src.get());
for (vcl_size_t i=0; i<buffer_dst.size(); ++i)
buffer_dst.set(i, buffer_src[i]);
break;
#endif
#ifdef VIENNACL_WITH_CUDA
case CUDA_MEMORY:
buffer_src.resize(handle_src, handle_src.raw_size() / element_size_src);
cuda::memory_read(handle_src.cuda_handle(), 0, buffer_src.raw_size(), buffer_src.get());
for (vcl_size_t i=0; i<buffer_dst.size(); ++i)
buffer_dst.set(i, buffer_src[i]);
break;
#endif
default:
throw "unsupported memory domain";
}
//
// Step 2: Write to destination
//
if (handle_dst.raw_size() == buffer_dst.raw_size())
viennacl::backend::memory_write(handle_dst, 0, buffer_dst.raw_size(), buffer_dst.get());
else
viennacl::backend::memory_create(handle_dst, buffer_dst.raw_size(), viennacl::traits::context(handle_dst), buffer_dst.get());
}
else
{
// No data conversion required.
typesafe_host_array<DataType> buffer(handle_src);
switch (handle_src.get_active_handle_id())
{
case MAIN_MEMORY:
switch (handle_dst.get_active_handle_id())
{
case MAIN_MEMORY:
case OPENCL_MEMORY:
case CUDA_MEMORY:
if (handle_dst.raw_size() == handle_src.raw_size())
viennacl::backend::memory_write(handle_dst, 0, handle_src.raw_size(), handle_src.ram_handle().get());
else
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst), handle_src.ram_handle().get());
break;
default:
throw "unsupported destination memory domain";
}
break;
case OPENCL_MEMORY:
switch (handle_dst.get_active_handle_id())
{
case MAIN_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
viennacl::backend::memory_read(handle_src, 0, handle_src.raw_size(), handle_dst.ram_handle().get());
break;
case OPENCL_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
viennacl::backend::memory_copy(handle_src, handle_dst, 0, 0, handle_src.raw_size());
break;
case CUDA_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
buffer.resize(handle_src, handle_src.raw_size() / element_size_src);
viennacl::backend::memory_read(handle_src, 0, handle_src.raw_size(), buffer.get());
viennacl::backend::memory_write(handle_dst, 0, handle_src.raw_size(), buffer.get());
break;
default:
throw "unsupported destination memory domain";
}
break;
case CUDA_MEMORY:
switch (handle_dst.get_active_handle_id())
{
case MAIN_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
viennacl::backend::memory_read(handle_src, 0, handle_src.raw_size(), handle_dst.ram_handle().get());
break;
case OPENCL_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
buffer.resize(handle_src, handle_src.raw_size() / element_size_src);
viennacl::backend::memory_read(handle_src, 0, handle_src.raw_size(), buffer.get());
viennacl::backend::memory_write(handle_dst, 0, handle_src.raw_size(), buffer.get());
break;
case CUDA_MEMORY:
if (handle_dst.raw_size() != handle_src.raw_size())
viennacl::backend::memory_create(handle_dst, handle_src.raw_size(), viennacl::traits::context(handle_dst));
viennacl::backend::memory_copy(handle_src, handle_dst, 0, 0, handle_src.raw_size());
break;
default:
throw "unsupported destination memory domain";
}
break;
default:
throw "unsupported source memory domain";
}
}
}
} //backend
//
// Convenience layer:
//
/** @brief Generic convenience routine for migrating data of an object to a new memory domain */
template <typename T>
void switch_memory_context(T & obj, viennacl::context new_ctx)
{
obj.switch_memory_context(new_ctx);
}
} //viennacl
#endif
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