Add description of CUDA hook issue and workarounds #173
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This PR describes the common issue that occurs when a serial application is launched with jsrun and gets a CUDA hook error. This can also happen if you call into CUDA before MPI_Init(). Two workarounds are proposed. Note that while I'm submitting this to Open Issues, this is really a design choice by IBM that has been carefully considered and has reasons for being designed the way it is, so it is not something that they are intending to change in the near future as far as I know.
Closes #78