/*************************************************************************
 * Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved.
 *
 * See LICENSE.txt for license information
 ************************************************************************/
#include "test_AllGather.hpp"
#include <omp.h>

namespace CorrectnessTests
{
    TEST_P(AllGatherCorrectnessTest, Correctness)
    {
        if (numDevices > numDevicesAvailable) return;
        if (numElements % numDevices != 0) return;

        // Prepare input / output / expected results
        Dataset dataset;
        dataset.Initialize(numDevices, numElements, dataType, inPlace);
        FillDatasetWithPattern(dataset);
        ComputeExpectedResults(dataset);

        size_t const byteCount = dataset.NumBytes() / dataset.numDevices;
        size_t const sendCount = dataset.numElements / dataset.numDevices;

        // Launch the reduction (1 thread per GPU)
        #pragma omp parallel for num_threads(numDevices)
        for (int i = 0; i < numDevices; i++)
        {
            ncclAllGather((int8_t *)dataset.inputs[i] + (i * byteCount),
                          dataset.outputs[i], sendCount,
                          dataType, comms[i], streams[i]);
        }

        // Wait for reduction to complete
        for (int i = 0; i < numDevices; i++)
            hipStreamSynchronize(streams[i]);

        // Check results
        ValidateResults(dataset);
    }

    INSTANTIATE_TEST_SUITE_P(AllGatherCorrectnessSweep,
                             AllGatherCorrectnessTest,
                             testing::Combine(
                                 // Reduction operator (not used)
                                 testing::Values(ncclSum),
                                 // Data types
                                 testing::Values(ncclInt8,
                                                 ncclUint8,
                                                 ncclInt32,
                                                 ncclUint32,
                                                 ncclInt64,
                                                 ncclUint64,
                                                 //ncclFloat16,
                                                 ncclFloat32,
                                                 ncclFloat64),
                                 // Number of elements
                                 testing::Values(3072, 3145728),
                                 // Number of devices
                                 testing::Values(2,3,4),
                                 // In-place or not
                                 testing::Values(false, true)));
} // namespace