( ESNUG 410 Item 10 ) ------------------------------------------- [04/02/03]

From: David Sawey <prisoner=dsawey  jail=vitesse tot sawn>
Subject: Is Vera/VCS Performance Better Than Vera/NC-Sim Performance?

Hi John,

Our Synopsys AC is saying that we can improve our Vera simulation run times
by a factor of between 1.8X and 6X by using Vera/VCS instead of Vera/NC-Sim.
The reason is that VCS implements a direct kernel interface whereas Cadence
NC-Sim uses the slower PLI interface.  However, when we run our testcases,
we find that the two approaches are actually quite competitive.  What's
going on?  Are we missing out on some performance increases that everyone
else is getting?

    - David Sawey
      Vitesse Semiconductor Corp.                Richardson, TX