[Mpi3-hybridpm] [Mpi3-rma] MPI_Win_Allocate_shared proposal draft

[Rajeev Thakur]

Looks good. Some comments:

6:14 - baseptrs -> baseptr

6:26 - DISP_UNIT -> SIZE

6:30 - "among all processes" -> "among all processes in comm"

6:31 - "returns" -> "and returns"

6:32 - "be target" -> "be the target"

6:33 - "accessed" -> "accesses"

6:33 - change to "remote processes; the base pointers for other processes can be queried..."

6:35 - Much of the sentence "The returned memory..." seems to be a repetition of what has been said before.

6:39 - I would like the sentence to clearly say that it is the user's responsibility to pass a communicator whose processes can share memory. How about changing it to 

"It is the user's responsibility to ensure that the communicator comm represents a group of processes that can create a shared memory segment that can be accessed by all processes in the group."

Then we should say what happens if the communicator contains processes that cannot share memory.

7:10 - "as info key" -> "as an info key"

7:35 - MPI_WIN_FLAVOR_SHM is not defined in 11.2.6


Since the default allocation is supposed to be contiguous, is the intended implementation method supposed to be something like the following:
   * wait for everyone to call the function
   * gather everyone's local size; add it up
   * allocate single, large shared memory
   * return local pointers everywhere


On Aug 29, 2011, at 12:12 AM, Torsten Hoefler wrote:

> Hello all,
> 
> We just posted a new update to the proposal (thanks to Bill for the
> comments!) to the ticket at
> https://svn.mpi-forum.org/trac/mpi-forum-web/attachment/ticket/284/
> 
> All the Best,
>  Torsten
> 
> -- 
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> Torsten Hoefler         | Performance Modeling and Simulation Lead
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