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ncsim performance impact of -access +R vs +RC vs +RWC?

cubicle82

The Incisive manual states that -access +W adds a small runtime performance overhead to simulation.

Does anyone know the exact impact of +R, +RC, and +RWC?

I'm guessing +RC adds some overhead to compilation (i.e. building the INCA_libs/), but has no effect on runtime.

What about +RWC (vs +RC) ?

Parents

  • There is no precise answer to this. Mickey gave a good answer already, I'd just add that with the design access turned off, the ncelab code generator adds varying amounts of performance optimisations to the design. As you demand more access (R / W /C) less of these optimisations can be applied, hence the performance drop.

    Every design is different, and some may benefit more from the optimisation than others, so it's pretty much impossible to predict what performance hit you'll see with access turned on.

    You'll see bigger differentials with your wave probing options I reckon...

    Cheers, Steve.

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  • There is no precise answer to this. Mickey gave a good answer already, I'd just add that with the design access turned off, the ncelab code generator adds varying amounts of performance optimisations to the design. As you demand more access (R / W /C) less of these optimisations can be applied, hence the performance drop.

    Every design is different, and some may benefit more from the optimisation than others, so it's pretty much impossible to predict what performance hit you'll see with access turned on.

    You'll see bigger differentials with your wave probing options I reckon...

    Cheers, Steve.

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