Optional annotation for edges in a CUDA graph. Note, all edges implicitly have annotations and default to a zero-initialized value if not specified. A zero-initialized struct indicates a standard full serialization of two nodes with memory visibility.
This indicates when the dependency is triggered from the upstream node on the edge. The meaning is specfic to the node type. A value of 0 in all cases means full completion of the upstream node, with memory visibility to the downstream node or portion thereof (indicated byto_port). Only kernel nodes define non-zero ports. A kernel node can use the following output port types:cudaGraphKernelNodePortDefault,cudaGraphKernelNodePortProgrammatic, orcudaGraphKernelNodePortLaunchCompletion.
These bytes are unused and must be zeroed. This ensures compatibility if additional fields are added in the future.
This indicates what portion of the downstream node is dependent on the upstream node or portion thereof (indicated byfrom_port). The meaning is specific to the node type. A value of 0 in all cases means the entirety of the downstream node is dependent on the upstream work. Currently no node types define non-zero ports. Accordingly, this field must be set to zero.
This should be populated with a value fromcudaGraphDependencyType. (It is typed as char due to compiler-specific layout of bitfields.) SeecudaGraphDependencyType.