71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/*******************************************************************************
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* Copyright (c) 2015-2018 Skymind, Inc.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License, Version 2.0 which is available at
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* https://www.apache.org/licenses/LICENSE-2.0.
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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******************************************************************************/
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//
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// @author raver119@gmail.com, created on 6/30/2018
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// @author Yurii Shyrma (iuriish@yahoo.com)
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//
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#ifndef LIBND4J_OMPLAUNCHHELPER_H
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#define LIBND4J_OMPLAUNCHHELPER_H
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#include <vector>
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#include <pointercast.h>
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#include <op_boilerplate.h>
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namespace nd4j {
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class ND4J_EXPORT OmpLaunchHelper {
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public:
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OmpLaunchHelper() = delete;
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OmpLaunchHelper(const Nd4jLong N, float desiredNumThreads = -1);
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FORCEINLINE Nd4jLong getThreadOffset(const int threadNum);
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FORCEINLINE Nd4jLong getItersPerThread(const int threadNum);
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static Nd4jLong betterSpan(Nd4jLong N);
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static Nd4jLong betterSpan(Nd4jLong N, Nd4jLong numThreads);
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static int betterThreads(Nd4jLong N);
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static int betterThreads(Nd4jLong N, int maxThreads);
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static int tadThreads(Nd4jLong tadLength, Nd4jLong numTads);
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int _numThreads;
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unsigned int _itersPerThread;
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unsigned int _remainder;
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};
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////////////////////////////////////////////////////////////////////////////////
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FORCEINLINE Nd4jLong OmpLaunchHelper::getThreadOffset(const int threadNum) {
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return threadNum * _itersPerThread;
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}
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////////////////////////////////////////////////////////////////////////////////
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FORCEINLINE Nd4jLong OmpLaunchHelper::getItersPerThread(const int threadNum) {
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return (threadNum == _numThreads - 1) ? _itersPerThread + _remainder : _itersPerThread; // last thread may contain bigger number of iterations
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}
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}
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#endif //LIBND4J_OMPLAUNCHHELPER_H
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