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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "FN_multi_function.hh"
#include "BLI_task.hh"
#include "BLI_threads.h"
namespace blender::fn {
using ExecutionHints = MultiFunction::ExecutionHints;
ExecutionHints MultiFunction::execution_hints() const
{
return this->get_execution_hints();
}
ExecutionHints MultiFunction::get_execution_hints() const
{
return ExecutionHints{};
}
static bool supports_threading_by_slicing_params(const MultiFunction &fn)
{
for (const int i : fn.param_indices()) {
const MFParamType param_type = fn.param_type(i);
if (ELEM(param_type.interface_type(),
MFParamType::InterfaceType::Mutable,
MFParamType::InterfaceType::Output)) {
if (param_type.data_type().is_vector()) {
return false;
}
}
}
return true;
}
static int64_t compute_grain_size(const ExecutionHints &hints, const IndexMask mask)
{
int64_t grain_size = hints.min_grain_size;
if (hints.uniform_execution_time) {
const int thread_count = BLI_system_thread_count();
/* Avoid using a small grain size even if it is not necessary. */
const int64_t thread_based_grain_size = mask.size() / thread_count / 4;
grain_size = std::max(grain_size, thread_based_grain_size);
}
if (hints.allocates_array) {
const int64_t max_grain_size = 10000;
/* Avoid allocating many large intermediate arrays. Better process data in smaller chunks to
* keep peak memory usage lower. */
grain_size = std::min(grain_size, max_grain_size);
}
return grain_size;
}
void MultiFunction::call_auto(IndexMask mask, MFParams params, MFContext context) const
{
if (mask.is_empty()) {
return;
}
const ExecutionHints hints = this->execution_hints();
const int64_t grain_size = compute_grain_size(hints, mask);
if (mask.size() <= grain_size) {
this->call(mask, params, context);
return;
}
const bool supports_threading = supports_threading_by_slicing_params(*this);
if (!supports_threading) {
this->call(mask, params, context);
return;
}
threading::parallel_for(mask.index_range(), grain_size, [&](const IndexRange sub_range) {
const IndexMask sliced_mask = mask.slice(sub_range);
if (!hints.allocates_array) {
/* There is no benefit to changing indices in this case. */
this->call(sliced_mask, params, context);
return;
}
if (sliced_mask[0] < grain_size) {
/* The indices are low, no need to offset them. */
this->call(sliced_mask, params, context);
return;
}
const int64_t input_slice_start = sliced_mask[0];
const int64_t input_slice_size = sliced_mask.last() - input_slice_start + 1;
const IndexRange input_slice_range{input_slice_start, input_slice_size};
Vector<int64_t> offset_mask_indices;
const IndexMask offset_mask = mask.slice_and_offset(sub_range, offset_mask_indices);
MFParamsBuilder offset_params{*this, offset_mask.min_array_size()};
/* Slice all parameters so that for the actual function call. */
for (const int param_index : this->param_indices()) {
const MFParamType param_type = this->param_type(param_index);
switch (param_type.category()) {
case MFParamType::SingleInput: {
const GVArray &varray = params.readonly_single_input(param_index);
offset_params.add_readonly_single_input(varray.slice(input_slice_range));
break;
}
case MFParamType::SingleMutable: {
const GMutableSpan span = params.single_mutable(param_index);
const GMutableSpan sliced_span = span.slice(input_slice_range);
offset_params.add_single_mutable(sliced_span);
break;
}
case MFParamType::SingleOutput: {
const GMutableSpan span = params.uninitialized_single_output_if_required(param_index);
if (span.is_empty()) {
offset_params.add_ignored_single_output();
}
else {
const GMutableSpan sliced_span = span.slice(input_slice_range);
offset_params.add_uninitialized_single_output(sliced_span);
}
break;
}
case MFParamType::VectorInput:
case MFParamType::VectorMutable:
case MFParamType::VectorOutput: {
BLI_assert_unreachable();
break;
}
}
}
this->call(offset_mask, offset_params, context);
});
}
std::string MultiFunction::debug_name() const
{
return signature_ref_->function_name;
}
} // namespace blender::fn
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