Dear Joshua,
I confirmed that it compiles and works with SVN HEAD.
Thanks a lot for your quick support!
Best regards,
--
Daisuke ISHII
2014-11-22 2:15 GMT+09:00 Joshua J Milthorpe <jjmil...@us.ibm.com>:
> Ishii-san,
>
> I have just committed a fix to support reduce/allreduce over user-defined
> struct types (r28605). The struct type must implement the appropriate
> interface e.g. Arithmetic[T] for Team.ADD as in your example. This should
> allow you to use GLBResult with a user-defined struct type.
>
> Are you able to update to SVN HEAD, or else merge the changes from r28605,
> to confirm this fix?
>
> Kind regards,
>
> Josh
>
> [image: Inactive hide details for Daisuke ISHII ---20/11/2014
> 22:34:24---Dear Dave, Thank you for your explanation of the
> implementatio]Daisuke
> ISHII ---20/11/2014 22:34:24---Dear Dave, Thank you for your explanation of
> the implementation.
>
> From: Daisuke ISHII <dsk.is...@gmail.com>
> To: Mailing list for users of the X10 programming language <
> x10-users@lists.sourceforge.net>
> Date: 20/11/2014 22:34
> Subject: Re: [X10-users] GLBResult
> ------------------------------
>
>
>
> Dear Dave,
>
> Thank you for your explanation of the implementation.
> I quickly tried with X10 2.5 but I got the same errors.
> I will look into the implementation as you suggested.
>
> Best regards,
>
> --
> Daisuke ISHII
>
>
> 2014-11-20 21:59 GMT+09:00 David P Grove <gro...@us.ibm.com>:
> > Daisuke ISHII <dsk.is...@gmail.com> wrote on 11/20/2014 04:10:59 AM:
> >>
> >> I am using the GLB library in X10 2.4.3.2.
> >> I wonder if there is a way to wrap a user-defined class or struct with
> >> GLBResult.
> >> When I implemented something like
> >> public class MyResult extends GLBResult[MyData] { ... }
> >> where MyData is a struct that implements Arithmetic[MyData], I got
> >> errors in compilation as follows:
> >>
> > <...C++ compilation error elided....>
> >
> > Hi,
> >
> > Internally GLB uses x10.util.Team.allreduce to collect up the
> intermediate
> > results and get to a final answer.
> >
> > In X10 2.4.3 when running using x10rt_sockets, we default to an
> > implementation of all-reduce written in C that only understands how to
> > manipulate built-in struct types (the typical types that an MPI allreduce
> > would also know how to handle: ints of various sizes, floats, doubles,
> > complex, boolean).
> >
> > In X10 2.5 and later with x10rt_sockets, we no longer default to the C
> > implementation of Team.allreduce. We instead use an X10-level emulated
> > collective operations.
> >
> > I'm not sure if it will actually work with a user-defined struct yet
> (Ben &
> > Josh, your thoughts?), but it in principle could be made to work.
> >
> > The alternative fix (and probably the only thing to do in X10 2.4.3) is
> to
> > go into the x10.glb implementation and to replace the uses of
> Team.allreduce
> > with the equivalent X10 code snippets that implement reduction via
> > at/finish/async or a collecting finish in vanilla X10. It won't scale as
> > well, but at moderate scale is probably ok and should be able to handle
> > user-defined structs.
> >
> > Hope this helps,
> >
> > --dave
> >
> >
> >
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