Static client initialization and finalization

[MichaelBrim]

Description

In order to make the use of UnifyCR more seamless, it is desirable to eliminate the need for client applications to directly call unifycr_mount() and unifycr_unmount(). Thus, we would like to call these functions as part of the client library's static initialization and finalization. This issue is to document the roadblocks to doing such static setup/teardown.

Initialization roadblocks

• MPI is used extensively during unifycr_mount(), but an application will not call MPI_Init() until after the library is initialized. Similarly, the MPI rank space is used as the UnifyCR global rank space, and the local rank and size of MPI_COMM_WORLD are passed as arguments to unifycr_mount().

Finalization roadblocks

• No problems identified yet.

[MichaelBrim]

In PR #288, Adam is working on using PMPI wrappers for MPI_Init and MPI_Finalize to call mount and unmount.

[MichaelBrim]

PR #298 added the PMPI wrapper method for mount/unmount

[adammoody]

Thanks @MichaelBrim