( ESNUG 412 Item 14 ) ------------------------------------------- [05/22/03]
Subject: ( SNUG 03 #6 ) An App Note On How To Speed Up Your ModelSim Runs
> We recently did a comparison of VCS and ModelSim SE. We were attracted to
> the substantial cost savings the ModelSim offers. We've tested them both
> with our latest Verilog design. We've compared VCS version 6.1 against
> ModelSim SE 5.7a (their latest I believe) on a Linux PC box (AMD 1.67 GHz,
> 2GB phys mem, Red Hat 6.2) and found:
>
> (a) design compile time and memory usage:
>
> The ModelSim SE compiles much faster than VCS. But it turns out that much
> of the "real" compilation occurs when you launch the simulator (vsim).
> The compiler (vlog) appears to be a light source code elaborator. However
> the SE took between x2-x3 the memory of VCS during compilation.
>
> (b) simulation runtime and memory usage:
>
> The simulation runtime between the SE and VCS varied based on the size of
> the test, but on the average SE took x5 longer to run, and took x3 the
> memory of VCS.
>
> - Joon Lee
> SafeNet, Inc.
From: Joe Rodriguez <joer=person company=model naught pawn>
Hi John,
I am a Technical Marketing Engineer in the ModelSim group at Mentor. I
appreciate all the comments in your postings. I wanted to let everyone know
that ModelSim Verilog's default configuration is for maximum visibility. It
has compile options for higher performance. The main ModelSim performance
optimization is the +opt Verilog compiler switch. There are just a few
considerations to keep in mind depending if you are running mixed HDL, or
pure Verilog. Enclosed is our App note that details how to run ModelSim
faster.
- Joe Rodriguez
Model Tech Portland, OR
[ Editor's Note: Joe's app note is #45 of DeepChip Downloads - John ]
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