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49 lines
1.5 KiB
49 lines
1.5 KiB
5 years ago
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/* Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#include <algorithm>
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#include "paddle/fluid/platform/cuda_primitives.h"
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namespace paddle {
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namespace platform {
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struct GpuLaunchConfig {
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// Number of threads per block.
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int threads;
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// Number of blocks for GPU kernel launch.
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int blocks;
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GpuLaunchConfig(int threads, int blocks) : threads(threads), blocks(blocks) {}
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};
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inline GpuLaunchConfig getGpuLaunchConfig(
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const int N, const framework::ExecutionContext& ctx) {
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int threads =
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std::min(1024, ctx.cuda_device_context().GetMaxThreadsPerBlock());
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int physical_thread_count =
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std::min(ctx.cuda_device_context().GetMaxPhysicalThreadCount(), N);
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int blocks = std::min((physical_thread_count + threads - 1) / threads,
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ctx.cuda_device_context().GetSMCount());
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GpuLaunchConfig config(threads, blocks);
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return config;
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}
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} // namespace platform
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} // namespace paddle
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