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Execution of ocean script in Cadence IC 6.1.5 and Cadence IC 5.1.41

Lings

 Hello,

I started to work recently on the new Cadence IC 6.1.5 moving from IC 5.1.4. I use Ocean Scripts and noticed that the ocean script takes a longer time to execute in the new version than in the old one. To verify this, I took a simple inverter circuit and performed the DC simulation analysis using Ocean script. I looped it 10 times for analysis purpose and measured the execution time. Executing the script in old version IC 5.1.41 produced a time of 130 sec while executing the same script in new version IC 6.1.5 produced a time of 502 sec. 

Could anyone let me know the possible rootcause of this issue and possible solutions for it?

Thanks,

Lings

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  • So is the python script running "ocean" each time? Or running virtuoso? What is it doing?

    Might it be the overhead of starting ocean each time that is the issue rather than the time to actally run the script? Perhaps you can add a:

    printf("START: %s\n" getCurrentTime())

    at the beginning and similar at the end (put END instead of START) - that way you can compare the time taken for the script itself. Also compare the simulation logs to see if the simulator itself is taking a different amount of time (not sure if it's the same version of spectre you're using).

    Regards,

    Andrew.

Reply

  • So is the python script running "ocean" each time? Or running virtuoso? What is it doing?

    Might it be the overhead of starting ocean each time that is the issue rather than the time to actally run the script? Perhaps you can add a:

    printf("START: %s\n" getCurrentTime())

    at the beginning and similar at the end (put END instead of START) - that way you can compare the time taken for the script itself. Also compare the simulation logs to see if the simulator itself is taking a different amount of time (not sure if it's the same version of spectre you're using).

    Regards,

    Andrew.

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