[MPI3-IO] Nonblocking Collective I/O Implementation for ticket #273

[Mohamad Chaarawi]

Hi All,

We have the prototype implementation for the nonblocking collective I/O 
routines provided by Dr. Edgar Gabriel and his student (Vishwanath 
Venkatesan). The implementation provides a prototype for implementing 
the following routines:

  * MPI_File_iread_all
  * MPI_File_iwrite_all
  * MPI_File_iread_at_all
  * MPI_File_iwrite_at_all

We did not implement, however the nonblocking counterpart for shared 
file pointer collective operations:

  * MPI_File_iread_ordered
  * MPI_File_iwrite_ordered

The reason is that the entire shared file pointer operations are not 
implemented within the MPI-I/O framework used. That being said, we can 
provide the pseudo code for the operations, since in reality there is 
nothing fundamentally difficult if we have a shared file pointer and the 
other nonblocking routines available.

Would anyone on this list object to the idea of just providing the 
pseudo code implementation for the shared file pointer routines (i.e. 
postpone voting on the ticket till we have a prototype implementation 
which would likely not be in the MPI-3.0 time frame anymore)?

Thanks,
Mohamad
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