cavis/libnd4j/include/helpers/OmpLaunchHelper.h

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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
//
// @author raver119@gmail.com, created on 6/30/2018
// @author Yurii Shyrma (iuriish@yahoo.com)
//
#ifndef LIBND4J_OMPLAUNCHHELPER_H
#define LIBND4J_OMPLAUNCHHELPER_H
#include <vector>
#include <system/pointercast.h>
#include <system/op_boilerplate.h>
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namespace sd {
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class ND4J_EXPORT OmpLaunchHelper {
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public:
OmpLaunchHelper() = delete;
OmpLaunchHelper(const Nd4jLong N, float desiredNumThreads = -1);
FORCEINLINE Nd4jLong getThreadOffset(const int threadNum);
FORCEINLINE Nd4jLong getItersPerThread(const int threadNum);
static Nd4jLong betterSpan(Nd4jLong N);
static Nd4jLong betterSpan(Nd4jLong N, Nd4jLong numThreads);
static int betterThreads(Nd4jLong N);
static int betterThreads(Nd4jLong N, int maxThreads);
static int tadThreads(Nd4jLong tadLength, Nd4jLong numTads);
int _numThreads;
unsigned int _itersPerThread;
unsigned int _remainder;
};
////////////////////////////////////////////////////////////////////////////////
FORCEINLINE Nd4jLong OmpLaunchHelper::getThreadOffset(const int threadNum) {
return threadNum * _itersPerThread;
}
////////////////////////////////////////////////////////////////////////////////
FORCEINLINE Nd4jLong OmpLaunchHelper::getItersPerThread(const int threadNum) {
return (threadNum == _numThreads - 1) ? _itersPerThread + _remainder : _itersPerThread; // last thread may contain bigger number of iterations
}
}
#endif //LIBND4J_OMPLAUNCHHELPER_H