Data Types

Figure 5-27 shows the Data Type dialog box. Display the Data Type dialog box by clicking on the Data Type View button in a Message dialog box. The fields of this dialog box are:

• Type - The description of the data type, such as "struct" or "contiguous."

• Address - The address of the corresponding MPI_Datatype object in the MPI program.

• Size - The size in bytes of a single element of this data type.

• Contiguous - An indication that the bytes of this data type are contiguous and may be sent or received without any intermediate packing or unpacking. If the data type is not contiguous, the label changes to Non-contiguous.

• Additional information that is specific to the data type, representing arguments that were passed to MPI to create the data type. This may include offsets, block sizes, pointers to other data types, and so forth. In this example, Displacement, Blocklength, and Oldtype refer to arguments the programmer used when creating the MPI struct data type. Click on buttons that name other data types to display the Data Type dialog box for that other type.

Figure 5-27 Data Type Dialog Box