Have you looked at boost.mpi? They have some nice C++-friendly constructors for different types to send/receive via MPI.
If boost.mpi doesn't do what you want, you'll likely need to have a custom MPI datatype constructed for each instance that you want to send/receive (and have that same datatype at both the sender and receiver), because both the internal types in the instance and the sizes of the arrays may differ in each instance. On Jan 18, 2012, at 12:36 AM, Victor Pomponiu wrote: > Hi, > > for several days I am trying to create MPI derived datatype in order to > send/receive an user defined object. I'm trying to implement it using > MPI::Datatype::Create_struct. > I have consulted several threads from the archive > > http://www.open-mpi.org/community/lists/users/2012/01/18093.php > http://www.open-mpi.org/community/lists/users/2005/08/0123.php > http://www.open-mpi.org/community/lists/users/2008/08/6302.php > > but I'm still havening difficulties to solve this issue. > There are some particular features that makes the task more difficult. Let me > explain: the obj. that I want to transmit is instantiated from a class called > MemberBlock. This class is a template class and contains: dynamic allocating > arrays, and objs. instantiated from other classes. Bellow is the class > declaration. > > Therefore how can I construct a MPI dervied data type in this situation? Any > suggestions are highly appreciated > > Thank you, > Victor Pomponiu > > ------------------------------------------------------------------------------------------------------------------------- > /** > * VecData.h: Interface class for data appearing in vector format. > */ > # include "DistData.h" //Interface class for data having a pairwise > distance measure. > > class VecData: public DistData { > > public: > // no properties, only public/private methods; > ......... > } > > /** > * VecDataBlock.h: Base class for storable data having a pairwise > * distance measure. > */ > > class VecDataBlock { > > public: > VecData** dataList; // Array of data items for this block. > > int numItems; // Number of data items assigned to the > block. > int blockID; // Integer identifier for this block. > int sampleID; // The sample identifier for this block > > int globalOffset; // Index of the first block item relative > to the full data set. > char* fileNamePrefix; // The file name prefix used for saving data to > disk. > char commentChar; // The character denoting input comment lines. > > // methods .......... > } > > > /** > * MemberBlock.h: Class storing and managing member lists for a given > * block of data objects. > */ > > class MemberBlock_base { > public: > virtual ~MemberBlock_base () {}; > }; > > template <class ScoreType> > class MemberBlock: public MemberBlock_base { > > public: > char* fileNamePrefix; // The file name prefix for the block save > file. > ofstream* saveFile; // refers to an open file currently being > used for accumulating > VecDataBlock* dataBlock; // The block of data items upon which > > int globalOffset; // The position of this block with respect > to the global ordering. > int numItems; // The number of data items assigned to the > block. > int sampleLevel; // The sample level from which > > ScoreType** memberScoreLList; // the scores of members associated with > // each data the item. > > int** memberIndexLList; // for each data item a list of global indices > of its members. > int* memberSizeList; // the number of list members. > > int memberListBufferSize; // buffer size for storing an individual member > list. > int saveCount; // Keeps track of the number of member lists > saved > float* tempDistBuffer; // A temporary buffer for storing distances, > used for breaking > > //methods.... > } > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
