2.20.3-1

Add support for alternating rings, allow for cross-nic rings without
cross-rail communication.
Add support for user buffer registration for network send/recv.
Optimize aggregated operations to better utilize all channels.
Add flattening for BCM PCI gen5 switches.
Add support for inter-node NVLink communication
Add support for port fusion in NET/IB.
Add support for ReduceScatter and AllGather using Collnet.
Update net API to v8.
Fix hang during A2A connection.

src/misc/ipcsocket.cc

@@ -132,7 +132,7 @@ ncclResult_t ncclIpcSocketRecvMsg(ncclIpcSocket *handle, void *hdr, int hdrLen,
       WARN("UDS: Receiving data over socket failed : %d", errno);
       return ncclSystemError;
     }
-    if (handle->abortFlag && *handle->abortFlag) return ncclInternalError;
+    if (handle->abortFlag && __atomic_load_n(handle->abortFlag, __ATOMIC_RELAXED)) return ncclInternalError;
   }
 
   if (recvFd != NULL) {
@@ -221,7 +221,7 @@ ncclResult_t ncclIpcSocketSendMsg(ncclIpcSocket *handle, void *hdr, int hdrLen,
       WARN("UDS: Sending data over socket %s failed : %s (%d)", temp, strerror(errno), errno);
       return ncclSystemError;
     }
-    if (handle->abortFlag && *handle->abortFlag) return ncclInternalError;
+    if (handle->abortFlag && __atomic_load_n(handle->abortFlag, __ATOMIC_RELAXED)) return ncclInternalError;
   }
 
   return ncclSuccess;