(j3.2006) [MPI3 Fortran] Feedback from Fortran J3 meeting

Dan Nagle dannagle
Wed May 28 12:06:20 EDT 2008


On May 28, 2008, at 11:25 AM, Craig Rasmussen wrote:
> So Bill suggested earlier using the asynchronous attribute instead.
> Since MPI_Irecv/MPI_Wait specify asynchronous IO operations,
> ASYNCHRONOUS seems to me to be the correct syntax.

But to Fortran, they are simply subroutine calls.
Further, only one actual argument is "asynchronous",
and that argument doesn't appear on the mpi wait statement.

How to identify the asynch argument, identify the start
of the asynch period, identify the end of the asynch period?

This seems to me to be a job for argument intents,
rather than an attribute of a variable.

> Perhaps this would work if we modified the last line to be
>       - any statement of the scoping unit is executed while the
> variable is a pending I/O storage sequence affector or becomes
> referenced or defined by an external I/O operation

OK, I'll bite.  What is an "external I/O operation" ?
How does one start, when has it finished?


Dan Nagle

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