Optimization

SUBROUTINE mlib_routine(...) ENTRY mlib_routine_(...)

...

And a C version might be:

#undef mlib_routine #undif mlib_routine_

void mlib_routine (...){

...

}

void mlib_routine_(...){ mlib_routine(...);

}

Optimization

The key computational kernels in VECLIB have been optimized to take full advantage of both PA-RISC and Itanium tightly integrated architectures. Optimizations include:

•Instruction scheduling to maximize the number of machine instructions executed per clock cycle

•Algorithm restructuring to increase the number of computations per memory access

•Cache management to decrease the number of data cache misses

Refer to “Accessing VECLIB” on page 3 for instructions on linking the desired library with your program.

Parallel processing

Parallel processing is available on multi-processor HP platforms running the HP-UX 11i or greater operating system and Linux. These systems can divide a single computational process into small streams of execution, called threads. The result is that you can have more than one processor executing on behalf of the same process. Also, refer to Appendix C, “Parallelized Subprograms,” for a list of HP VECLIB parallelized subprograms.

Chapter 1 Introduction to VECLIB 17