Performance on an SMP system may be limited by memory
bandwidth. To test for a memory bandwidth limitation, run
multiple copies of a program as a single processor application
on an SMP system. It should take the same time for 2 independent
copies to run on 2 processors as it takes for 1 copy to run on 1
processor. If 2 copies take longer to run, your system probably
has a memory bandwidth bottleneck.
Use the OpenVMS Alpha routines lib$init_timer
and lib$show_timer to view the real elapsed time of
code sections that run in less than 1 second.