Updating RCCL based on NCCL 2.3.7

- Contains modifications to support AMD hardware
- Adds unit tests


[ROCm/rccl commit: 55a4b22ad7]

projects/rccl/test/test_AllGather.cpp

@@ -0,0 +1,63 @@
+/*************************************************************************
+ * 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