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alexislms
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4 years ago
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Why is Questa slower than Modelsim?

I was used to simulate with Intel-Modelsim SE 10.7c. I might have a new project using an Intel FPGA therefore I wanted to give Intel-Questa SE a try and I was surprised to see it's twice slower tha...
  • alexislms's avatar
    alexislms
    4 years ago

    Hi @YEan,

    Interesting... this was my first hands-on with intel's tools.

    I now Questa delivered with Quartus pro 22.1 to avoid any compatibility issues.

    Regards,

YEan's avatar
YEan
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4 years ago

May I know which version of Quartus you are using ?

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    alexislms
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    4 years ago

    Sorry, it's completely independent, Quartus plays no role here.

    Intel-Modelsim SE 20.1 vs Intel-Questa SE 21.1, both provided by Intel with free license.

    I run my design with a tcl script, IIRC generated by a previous version of Quartus (com, elab ...) but that doesn't really matter. I'm talking about the speed of two simulators for an exact same design and tcl script.

    Intel has replaced Modelsim SE with Questa SE that is much slower.

    • YEan's avatar
      YEan
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      4 years ago

      Intel-Questa SE 21.1should be faster than Intel-Modelsim SE 20.1, I'm not sure why it is slow. I might need some time to look into it.

      • YEan's avatar
        YEan
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        4 years ago

        I have tried to run a small project in both of these simulators and I think the speed was same for me.