2.4.2-1

Add tree algorithms for allreduce to improve performance at scale.
Add ncclCommAbort() and ncclCommGetAsyncError() to properly handle
network errors and be permit recover.
Detect initial CPU affinity and no longer escape it.


[ROCm/rccl commit: 1450d42675]

projects/rccl/src/include/trees.h

@@ -0,0 +1,13 @@
+/*************************************************************************
+ * Copyright (c) 2015-2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * See LICENSE.txt for license information
+ ************************************************************************/
+
+#ifndef NCCL_TREES_H_
+#define NCCL_TREES_H_
+
+ncclResult_t ncclGetBtree(int nranks, int rank, int* u0, int* d1, int* d0);
+ncclResult_t ncclGetDtree(int nranks, int rank, int* u0, int* d0_0, int* d0_1, int* u1, int* d1_0, int* d1_1);
+
+#endif