H-Series Application Migration Guide (H06.03+)

Migrating TNS Applications to H-Series Systems

H-Series Application Migration Guide—429855-006

B-8

Object Code Accelerator Utility

OCA augments the object file with an Itanium region that contains the Itanium

instructions. The augmented object file is said to be an “accelerated” file. The OCA-

accelerated object file not only runs significantly faster than the unaccelerated object

file, but it also exhibits improved performance over the same object file accelerated

using Accelerator on a G-series system. Figure B-2 shows the OCA acceleration

process.

Interpreted and accelerated TNS files can be debugged using debugging tools

available on H-series systems. See H-Series TNS Debugging Tools on page B-9.

Running Object Code Accelerator

To run the Object Code Accelerator, use the OCA command. The OCA command is

similar to the AXCEL command, but some command line options differ. See the OCA

Manual for details.

Creating an Accelerated Object File With RISC and Itanium

Regions

You can use OCA to accelerate an object file that has already been accelerated by

Accelerator. The resulting file contains both RISC code and Itanium code, each in a

separate region in the file. Similarly, you can use Accelerator to accelerate a file that

has been accelerated by OCA. In this manner, you can create a single object file

accelerated for both the TNS/R and TNS/E platforms. Figure B-3 on page B-9

illustrates the creation of an accelerated object file with Itanium code and RISC code

regions.

Figure B-2. OCA Acceleration Process

vsd003.vst

TNS

Compiler

TNS

Object Code

Accelerator

TNS

Object Code

Accelerated

Object Code

(Itanium)