Is it safe to call jcuda.driver.JCudaDriver/cuInit multiple times in a program?

Question

I'm using a dynamic language (Clojure) to create CUDA contexts in a interactive development way using JCuda. Often I will call an initializer that includes the call to jcuda.driver.JCudaDriver/cuInit. Is it safe to call cuInit multiple times? In addition, is there something like a destroy method for cuInit? I ask since its possible for an error code CUDA_ERROR_DEINITIALIZED to be returned.

Answer 1

To answer the question, yes it is probably safe to call cuInit multiple times. I haven't noticed any side effects from doing so.

Note, however, that cuInit only triggers one-time initialisation processes inside the API. It doesn't do anything with devices, or contexts and it definitely can't return CUDA_ERROR_DEINITIALIZED. Doing the steps you would do after calling cuInit in an application (ie. creating a context) would have real implications - doing so creates a new context each time you call it and resource exhaustion will occur if contexts are not actively destroyed. There is no equivalent deinitialisation call for the API. I guess the intention is that once intialised, the runtime API is expected to stay in that state until an application terminates.