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------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk
_______________________________________________
X10-users mailing list
X10-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/x10-users
