Charm++ parallel programming system

[Eric Bohm <ebohm AT illinois.edu>]

The missing concept here is that a chare is a parallel object which may be local or remote.  When you ckNew a chare, you get back a proxy ID for the chare which you can make use as a handle to issue remote procedure calls, not a pointer to the chare itself.

The CkArray collection has been provided as parallel aware infrastructure to manage collections of chares, perhaps it would be simpler to consider a custom index scheme for a CkArray that matches the iteration method you intended in your linked list?



On 06/05/2013 04:56 PM, Nicolas Bock wrote:

Hi list,

this question may have an obvious answer, but my C++ skills are so rusty that it's not obvious to me right now...

I would like to build a linked list of chares. I envision something like the inlined code. However, I am getting a compiler error, saying that:

test.cc: In member function 'void LinkedListNode::append(int)':

test.cc:28:45: error: cannot convert 'CkChareID' to 'CProxy_LinkedListNode*' in assignment

I guess I am not understanding how chares are instantiated. What does the ckNew() method do? Do I have to throw in a new operator?

Thanks already,

nick

test.ci:

mainmodule linkedList

{

  mainchare Main

  {

    entry Main (CkArgMsg *msg);

  };

  chare LinkedListNode

  {

    entry LinkedListNode ();

    entry void set (const int ID);

    entry void append (const int ID);

  };

};

test.cc:

#include "linkedList.decl.h"

class LinkedListNode : public CBase_LinkedListNode

{

  private:

    int ID;

    CProxy_LinkedListNode *next;

  public:

    LinkedListNode ()

    {

      ID = -1;

      next = NULL;

    }

    void set (const int ID)

    {

      this->ID = ID;

    }

    void append (const int ID)

    {

      if(next != NULL) { next->append(ID); }

      else 

      {

        next = CProxy_LinkedListNode::ckNew();

        next->set(ID);

      }

    }

};

class Main : public CBase_Main

{

  private:

    CProxy_LinkedListNode first;

  public:

    Main (CkArgMsg *msg)

    {

      first = CProxy_LinkedListNode::ckNew();

      first.set(0);

      for(int i = 1; i < 10; i++)

      {

        first.append(i);

      }

    }

};

#include "linkedList.def.h"

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