[NCCL][Test Only] no change

Differential Revision: [D23922690](https://our.internmc.facebook.com/intern/diff/D23922690/)

ghstack-source-id: 112873717
Pull Request resolved: #45320

torch/lib/c10d/NCCLUtils.hpp

@@ -17,6 +17,8 @@
 #define ENABLE_NCCL_ERROR_CHECKING
 #endif
 
+// Fix build issues with NCCL P2P - until then disable NCCL send/recv.
+#if defined(ENABLE_NCCL_A2A) && (ENABLE_NCCL_A2A == 1)
 // P2P is enabled only for NCCL versions 2.7+ since ncclSend()
 // and ncclRecv() are not supported in earlier versions.
 #if defined(NCCL_MAJOR) && (NCCL_MAJOR == 2) && defined(NCCL_MINOR) && \
@@ -25,6 +27,7 @@
 #elif defined(NCCL_MAJOR) && (NCCL_MAJOR >= 3)
 #define ENABLE_NCCL_P2P_SUPPORT
 #endif
+#endif
 
 // Macro to throw on a non-successful NCCL return value.
 #define C10D_NCCL_CHECK(cmd)                                                 \

torch/lib/c10d/ProcessGroupNCCL.cpp

@@ -196,6 +196,7 @@ ncclResult_t ncclAlltoallv(
     ncclDataType_t type,
     ncclComm_t comm,
     cudaStream_t stream) {
+  std::cout << "ncclAlltoallv?" << std::endl;
   int numranks;
   C10D_NCCL_CHECK(ncclCommCount(comm, &numranks));
   C10D_NCCL_CHECK(ncclGroupStart());