Charm++ parallel programming system

[Filippo Gioachin <gioachin AT uiuc.edu>]

Alternatively, you can chop your 2-D array into N 1-D array, then each can perform its own reduction. If you need to do multicasts that span more than one array, you can use a CProxySection spanning all the arrays you need.

Filippo

On Tue, May 4, 2010 at 08:04, Ramprasad Venkataraman <ramv AT illinois.edu> wrote:

Delegate your sections to CkMulticast if you want section reductions.

Ram

On May 4, 2010, at 7:36 AM, Phil Miller <mille121 AT illinois.edu> wrote:

> On Tue, May 4, 2010 at 01:10, Abhishek Gupta <gupta59 AT illinois.edu>
> wrote:
>> I have a 2-D partitioned matrix and I want to do a reduction along x
>> dimension in this 2-D chare Array and this needs to be done for each
>> column.  What is the best way to do that ? Using array section
>> proxies ?
>
> Instinctively, I'm inclined to say that there's no baked-in support
> for that at present. Depending on how performance critical this
> reduction is, you may be best off implementing it in your application
> as "everyone sends to (0,y)" and have one element calculate the
> reduction, or by manually sending the data up a tree.
>
> It looks like the libraries in
> src/libs/ck-libs/{sparseReducer,sparseContiguousReducer} may serve
> your purpose.
>
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-- 
Filippo Gioachin
PhD Candidate
Department of Computer Science
University of Illinois at Urbana-Champaign
Ph: +1-217-333-4764