Hi,
I'll let Dave Cunningham comment on the GPU part, but I'd guess that the
IndexedMemoryChunk is the one you get from [a local] Array.raw() and
raw_len allows you to address a subset of the chunk.
Your region literals also need to be 0..(n-1) rather than 0..n-1, now (if
you're using trunk) or in the future (in an upcoming release), per some
recent changes in trunk.
Minor
From: Christoph Pospiech <christoph.pospi...@de.ibm.com>
To: Mailing list for users of the X10 programming language
<x10-users@lists.sourceforge.net>
Date: 01/03/2011 06:16 AM
Subject: Re: [X10-users] array question
On Friday, December 17, 2010, Josh Milthorpe wrote:
> Have a look at the RemoteArray class and the Array.copy(...) and
> Array.asyncCopy(...) methods. These support a variety of patterns of
> local and remote updates - hopefully one of them matches your
requirement.
>
> Cheers,
>
> Josh
Josh (et. al.),
I have just looked at the RemoteArray class, because I need to do a remote
copy, but this class remains a mystery to me.
It appears that RemoteArray has two constructors,
- RemoteArray(Array<T> a)
- RemoteArray(Place gpu, Region reg, IndexedMemoryChunk<T> raw, Int
raw_len)
The second (as the Place variable is suspiciously called "gpu") appears to
be
designed with GPGPU usage in mind. It is quite unclear to me how to
specify an
IndexedMemoryChunk. Does this need to be allocated first (via
IndexedMemoryChunk.allocate() ) ? On which place ? And how do I determine
the
raw_len ?
The first constructor appears to be able to turn any Array into a
RemoteArray,
if the constructor is called at the place where the Array lives.
Now I tried the following.
finish ateach(pt in Dv_tmp ) {
val v_1 = new
Array[Double]((0..n-1),(0.0) as Double);
v_src(pt) = RemoteArray(v_1);
val v_2 = new
Array[Double]((0..n-1),(0.0) as Double);
v_dst(pt) = RemoteArray(v_2);
[...some code deleted ...]
}
x10c++ v2.1 complained about this with the following messages.
/home/cp/xample/MatMul/mm_X10/src/matmul.x10:100: Method or static
constructor
not found for given call.
Call: RemoteArray(x10.array.Array[x10.lang.Double]{self==v_1,
v_1.region.rect==true, v_1.region.rank==1, v_1.region.zeroBased==true,
v_1!=null})
/home/cp/xample/MatMul/mm_X10/src/matmul.x10:102: Method or static
constructor
not found for given call.
Call: RemoteArray(x10.array.Array[x10.lang.Double]{self==v_2,
v_2.region.rect==true, v_2.region.rank==1, v_2.region.zeroBased==true,
v_2!=null})
/home/cp/xample/MatMul/mm_X10/src/matmul.x10:174-175: No valid method call
found for call in given type.
Can anyone explain these mysteries to me ?
--
Mit freundlichen Grüßen / Kind regards
Dr. Christoph Pospiech
High Performance & Parallel Computing
Phone: +49-351 86269826
Mobile: +49-171-765 5871
E-Mail: christoph.pospi...@de.ibm.com
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