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viewing spectre simulation results right from the start

memphis

Hi to everyone!

We're looking for a solution for an apparently simple problem.

When starting a simulation with spectre, we want to look into the results right from the beginning.
We want to do this to evaluate the simulation immediately. This is sometimes necessary for long-lasting simulations to stop them if they are going into the wrong direction.

However, spectre seems to update the saved simulation data periodically in fixed time frames.
Thus, for long simulations we have to wait for a very long time to be able to take a first look at our saved outputs. Is there a command or a flag for spectre (MMSIM) that I can set to shorten this time frame?

We spent a lot of time searching for this option in the Cadence manuals without success. We are using IC6.1.6 and MMSIM14.1 but the problem is version independent since older and newer releases show same behavior in our setup.


Thank you for your help in advance.

  • Quek

    Hi Rene

    You can control the speed as which spectre flushes out psfxl data using the following variable:

    setenv CDS_PSFXL_INIT_FLUSH_INTERVAL 10

    The above means that spectre will flush out the 1st set of data after 10 seconds instead of the default 300 seconds (5mins).

    Please refer to either COS article 11643554 or search for "FLUSH" in $CDSHOME/doc/anasimhelp/anasimhelp.pdf for more details.


    Best regards
    Quek

  • Andrew Beckett

    You should also heed the advice given in the article that Quek refers to. Adjusting the minimum flush time is not too bad - it just allows quicker access to the results early in the simulation. However, there is a significant performance benefit that comes from writing the data in bigger chunks, and setting the maximum flush time rather defeats the benefit of that.

    I wouldn't anticipate that after a period of running a very long simulation it would be necessary to get updates more frequently than every 5 minutes. However, in the first few minutes I can see why you might want to ensure that something sensible is happening.

    Kind Regards,

    Andrew.

  • memphis
    Thank you for your help.
    @Quek - The environment variable was the solution we were looking for.
    @Andrew - We are aware of the advantages or disadvantages of quicker access or writing data in bigger chunks. Nevertheless thank you for pointing to this problem.

    Best Regards
    René

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