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.

src/include/bootstrap.h

@@ -13,5 +13,7 @@ ncclResult_t bootstrapCreateRoot(ncclUniqueId* commId, bool idFromEnv);
 ncclResult_t bootstrapGetUniqueId(ncclUniqueId* out);
 ncclResult_t bootstrapInit(ncclUniqueId* id, int rank, int nranks, void** commState);
 ncclResult_t bootstrapAllGather(void* commState, void* allData, int size);
+ncclResult_t bootstrapSend(void* commState, int peer, void* data, int size);
+ncclResult_t bootstrapRecv(void* commState, int peer, void* data, int size);
 ncclResult_t bootstrapClose(void* commState);
 #endif