MPIUserpointer
MPIUserpointer is a concept within the Message Passing Interface (MPI) standard that allows users to associate arbitrary data with specific MPI communicators or objects. This is achieved by providing a pointer, typically a void pointer, that can store a reference to user-defined data structures. The MPI standard itself does not interpret or manage this user data; it merely acts as a container for the pointer provided by the application.
The primary purpose of MPIUserpointer is to enable applications to maintain context or auxiliary information related
MPI functions that support user pointers often have an argument named `attributes` or similar. These attributes