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enable eigen multi-threads on mobile device (#10938)
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/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. */ | ||
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#pragma once | ||
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#if defined(__OSX__) || defined(__APPLE__) | ||
#include <sys/sysctl.h> | ||
#include <sys/types.h> | ||
#endif | ||
#include "unsupported/Eigen/CXX11/Tensor" | ||
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namespace paddle { | ||
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#if defined(__ANDROID__) | ||
int GetCpuCount() { | ||
FILE* fp = fopen("/sys/devices/system/cpu/possible", "r"); | ||
if (!fp) { | ||
return 1; | ||
} | ||
int rank0, rank1; | ||
int num = fscanf(fp, "%d-%d", &rank0, &rank1); | ||
fclose(fp); | ||
if (num < 2) return 1; | ||
return rank1 + 1; | ||
} | ||
#elif defined(__OSX__) || defined(__APPLE__) | ||
int GetCpuCount() { | ||
int count = 0; | ||
size_t len = sizeof(int); | ||
sysctlbyname("hw.ncpu", &count, &len, NULL, 0); | ||
return count > 0 ? count : 1; | ||
} | ||
#else | ||
int GetCpuCount() { return 1; } | ||
#endif | ||
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class EigenDeviceWarpper { | ||
public: // NOLINT | ||
#if EIGEN_USE_THREADS | ||
static Eigen::ThreadPoolDevice* device() { | ||
const int num_cpus = GetCpuCount(); | ||
const int num_threads = (num_cpus > 2) ? 2 : num_cpus; | ||
static Eigen::ThreadPool tp(num_threads); | ||
static Eigen::ThreadPoolDevice* device = | ||
new Eigen::ThreadPoolDevice(&tp, num_threads); | ||
return device; | ||
} | ||
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static void free_device(Eigen::ThreadPoolDevice* device) { | ||
// do nothing | ||
} | ||
#else | ||
static Eigen::DefaultDevice* device() { | ||
Eigen::DefaultDevice* device = new Eigen::DefaultDevice; | ||
return device; | ||
} | ||
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static void free_device(Eigen::DefaultDevice* device) { delete device; } | ||
#endif | ||
}; | ||
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} // namespace paddle |