test release: parallel-netcdf 1.3.0pre1

[Jim Edwards]

Oh - thanks for that clarification.

On Mon, Apr 23, 2012 at 3:52 PM, Wei-keng Liao
<wkliao at ece.northwestern.edu>wrote:

>
> In that case, the nonblocking APIs are still available but
> they do not work as intended. That is, you can still call
> the APIs, but they will write the requests independently
> and thus will not give you any better performance.
>
> So, the same program calling iput/iget should be able to
> compile and run on BGL.
>
> Wei-keng
>
>
> On Apr 23, 2012, at 4:42 PM, Rob Latham wrote:
>
> > On Mon, Apr 23, 2012 at 03:38:06PM -0600, Jim Edwards wrote:
> >> On Mon, Apr 23, 2012 at 3:30 PM, Rob Latham <robl at mcs.anl.gov> wrote:
> >>
> >>> On Mon, Apr 23, 2012 at 03:07:33PM -0600, Jim Edwards wrote:
> >>>> Oh - and just to confirm - the async capabilities of pnetcdf (eg
> >>>> nfmpi_iput_ ) are not supported
> >>>> on BGL and BGP - how about BGQ?
> >>>
> >>> Sure, let's clarify a bit.  The interface should be supported: IBM's
> >>> MPI supports the necessary MPI-2 features.   The API allows you to
> >>> describe multiple operations, then when you wait for completion those
> >>> operations will get stitched together into one bigger more efficient
> >>> request.
> >>>
> >>> I do mean non-blocking and when I build on frost I get the following
> >> message:
> >>
> >> checking if MPI_Offset is size 8... yes
> >> checking if MPI_Aint is size 8... no
> >> checking if MPI_Aint is size 4... yes
> >> checking for MPI_Info_dup... yes
> >> checking for MPI_Info_free... yes
> >> checking for MPI_Get_address... yes
> >> checking for MPI_Request_get_status... yes
> >> checking for MPI_Type_dup... yes
> >> configure: WARNING: MPI_Offset and MPI_Aint have different sizes:
> unable to
> >> support non-blocking routines
> >
> > Oh, crud.
> >
> > OK, thanks for reminding me about that.  Yes, on BlueGene/L, the MPI
> > library has a 4 byte MPI_Aint and an 8 byte MPI_Offset.  We got IBM to
> > implement 8 byte MPI_Aint types on BlueGene/P, but clearly that never
> > made its way to BlueGene/L's version.
> >
> > The iput/iget routines do work on BlueGene/P.
> >
> > ==rob
> >
> > --
> > Rob Latham
> > Mathematics and Computer Science Division
> > Argonne National Lab, IL USA
>
>


-- 

Jim Edwards
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