One doc tagged with "driver-api"

Every CUDA C++ example so far — >> launches, cudaMalloc, cudaMemcpy — has gone through the runtime API, the high-level interface linked in as cudart and initialized implicitly the first time a program touches the GPU. Underneath it sits the driver API (cuda.h, linked as cuda), a lower-level, explicit interface that the runtime itself is built on. Almost nothing in application code needs the driver API directly, but understanding what the runtime is hiding explains a class of errors ("invalid device context") that only make sense once you know a context exists at all.