On units of compute functionality 2.x and higher, the scale of the decision stack may be queried using cudaDeviceGetLimit() and set using cudaDeviceSetLimit(). The runtime maintains an error variable for each host thread that’s initialized to cudaSuccess and is overwritten by the error code each time an error occurs . CudaGetLastError() returns this variable and resets it to cudaSuccess. Depending on the system properties, particularly the PCIe and/or NVLINK topology, devices are capable of tackle one another’s reminiscence (i.e., a kernel executing on one system can dereference a pointer to the reminiscence of the opposite device). This peer-to-peer reminiscence access feature is supported between two units ifcudaDeviceCanAccessPeer() returns true for these two devices. For code that is compiled using the –default-stream legacycompilation flag, the default stream is a special stream referred to as the NULL stream and every device has a single NULL stream used for all host threads.
The …