IBM PE for AIX V2R4.0: Operation and Use, Vol. 2, Part 1

Appendix C. Exporting Arrays to Hierarchical Data Format (HDF)

HDF is a multi-object data format from the National Center of Excellence in Supercomputing Applications (NCSA), which is used for scientific and visualization data. Pedb uses HDF (version 3.3) as the data format for exporting arrays in both the array export and visualization features. See "Exporting Array Information to File" and "Visualizing Program Arrays" for more information.

HDF supports a variety of object types within a file. Pedb exports array information using the Scientific Data Set (SDS) type plus additional array attributes. If you are exporting more than one array to the export file concurrently, pedb will create one SDS for each array.

The following tables list the attributes written to the HDF file by pedb.

The first table gives dimension attributes; one for each dimension of each SDS.

Table 15. Array attributes defined by pedb

Name	Type	Values	Description
Label	Dimension	Any string (no default)	Label that describes this dimension
Units	Dimension	Any string (no default)	Units to be used with this dimension
Format	Dimension	Any string (no default)	Format to be used to display scale

The next table gives SDS attributes; one for each SDS.

Table 16. Array attributes defined by pedb

Name	Type	Values	Description
Variable Name	File	Any string (defaults to the array declaration)	This is the string defined by the user on the Export Dialog window
Language_Type	SDS	"C" or "F77"	The source language from which the array was exported
Datetime	SDS	32-bit signed integer	The time the SDS was created
Bele	SDS	Always 1 ( Big Endian = 1 , Little Endian = 0)	Big Endian or Little Endian
Attached_ID	SDS	-1 (always)	Reserved - not used
SamplingFormat	SDS	1 (always)	Reserved - not used
Attach_Type	SDS	"RS6000"	String indicating processor type
Task_ID	SDS	32-bit signed integer	Task id of the task where the array was exported
Process_ID	SDS	32-bit signed integer	Process id of the task where the array was exported
Host	SDS	<hostname string>	String name of the host where the array was exported
SamplingStart	SDS	32-bit signed integer(s)	An array of minimum values of the subrange for each dimension
SamplingStride	SDS	32-bit signed integer(s)	An array of strides of the subrange for each dimension
SamplingEnd	SDS	32-bit signed integer(s)	An array of maximum values of the subrange for each dimension
BaseMinimum	SDS	32-bit signed integer(s)	An array of the base minimum of the subrange for each dimension.
BaseMaximum	SDS	32-bit signed integer(s)	An array of the base maximum of the subrange for each dimension
MemAddress	SDS	32-bit signed integer	The base address of the array that was exported