simpleMultiGPU.h

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/* 
 * PAPI Multiple GPU example.  This example is taken from the NVIDIA
 * documentation (Copyright 1993-2013 NVIDIA Corporation) and has been
 * adapted to show the use of CUPTI and PAPI in collecting event
 * counters for multiple GPU contexts.  PAPI Team (2015)
 */

/*
 * This software contains source code provided by NVIDIA Corporation
 *
 * According to the Nvidia EULA (compute 5.5 version)
 * http://developer.download.nvidia.com/compute/cuda/5_5/rel/docs/EULA.pdf
 *
 * Chapter 2. NVIDIA CORPORATION CUDA SAMPLES END USER LICENSE AGREEMENT
 * 2.1.1. Source Code
 * Developer shall have the right to modify and create derivative works with the Source
 * Code. Developer shall own any derivative works ("Derivatives") it creates to the Source
 * Code, provided that Developer uses the Materials in accordance with the terms and
 * conditions of this Agreement. Developer may distribute the Derivatives, provided that
 * all NVIDIA copyright notices and trademarks are propagated and used properly and
 * the Derivatives include the following statement: “This software contains source code
 * provided by NVIDIA Corporation.”
 */

/*
 * This application demonstrates how to use the CUDA API to use multiple GPUs.
 *
 * Note that in order to detect multiple GPUs in your system you have to disable
 * SLI in the nvidia control panel. Otherwise only one GPU is visible to the
 * application. On the other side, you can still extend your desktop to screens
 * attached to both GPUs.
 */

#ifndef SIMPLEMULTIGPU_H
#define SIMPLEMULTIGPU_H

typedef struct
{
    //Host-side input data
    int dataN;
    float *h_Data;

    //Partial sum for this GPU
    float *h_Sum;

    //Device buffers
    float *d_Data,*d_Sum;

    //Reduction copied back from GPU
    float *h_Sum_from_device;

    //Stream for asynchronous command execution
    cudaStream_t stream;

} TGPUplan;

extern "C"
void launch_reduceKernel(float *d_Result, float *d_Input, int N, int BLOCK_N, int THREAD_N, cudaStream_t &s);

#endif