Charm++ parallel programming system

[Phil Miller <mille121 AT illinois.edu>]

I don't expect it to result in a data race, because 'ckLocal' works (IIRC) on a per-PE basis for all objects besides NodeGroup instances.

Also, you can achieve the same effect with less manual effort with the [inline] entry method attribute.

On Wed, Sep 11, 2013 at 12:18 PM, Nicolas Bock <nicolasbock AT gmail.com> wrote:

Hi,

suppose I have a chare array A, and a single chare B. The A chares calculate something and want to add their results to some data in B. This can be done by calling

CProxy_Data B;

B.add(data);

inside a method of A. As far as I understand it, the RTS guarantees that this will not lead to a data race since it will not allow A::add() to execute in parallel. But now suppose I check whether A is local to the B chares and do this instead:

BLocal = A.ckLocal();

if(BLocal != NULL) BLocal->add(data);

will this not result in a data race if there are more than one B chare on a node?

Thanks,

nick

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