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Eval error on MATLAB expressions from ADE/Maestro outputs

MichR

For our design we need to perform post-processing of a few waveforms using MATLAB, so we set up a matlabexpr in our Maestro testbench.

So far it works for single point simulations, but the expression sometimes fails to evaluate when the simulation is performed over multiple points by sweeping a design variable or parameter. Oddly enough, the first simulation point gets evaluated correctly, but for the last ones it gives an "eval err" as output.

To debug the problem I modified our post-processing MATLAB function to write a log file as a way to determine where the expression fails to evaluate, and it seems that MATLAB is not even started when the outputs of the second simulation point (and all the remaining points) are evaluated as the log file is unmodified after the first successful evaluation.

With sstatus(errsetTrace t) and _stacktrace=50 I could pinpoint that the issue is in an internal ADE function:

However, I'm totally unable to understand what I should try to fix this issue.

It seems to be reproducible all the time. These are the steps to perform to replicate the issue:

  1. Launch Virtuoso and open a Maestro view with a matlabexpr.
  2. Start a sweep simulation. All the matlabexpr should evaluate correctly.
  3. Start a single point simulation. The matlabexpr should still evaluate correctly.
  4. Start a sweep simulation. Now, the first evaluation is successful, while the remaining ones fail.

Our MATLAB version is r2023b and we are running Virtuoso Studio IC23.1-64b.ISR2.29

  • We are having similar problems with matlabexpr. Everything is fine for single point simulations, but the evaluation sometimes fails for sweeps and we even had Virtuoso freeze up completely several times so that we had to kill it. It is not very clear for us what triggers the bug; there might be a problem when a simulation point finishes and wants to start the MATLAB evaluation while such an evaluation is still running for another point. We have submitted CCR 2945798 for this problem, unfortunately without any response so far. If you manage to find out anything, we would be very interested.

  • Michele,

    I would strongly suggest you contact customer support (submit a case after logging in) so that we can investigate.

    Andrew

  • in reply to Frank Wiedmann

    Thank you for your prompt response. Actually, I'm able to always reproduce the issue with the following steps:

    1. Launch Virtuoso and open a Maestro view with a matlabexpr.
    2. Start a sweep simulation. All the matlabexpr should evaluate correctly.
    3. Start a single point simulation. The matlabexpr should still evaluate correctly.
    4. Start a sweep simulation. Now, the first evaluation is successful, while the remaining ones fail.
    5. To make the evaluation successful for all the points again, you need to fully close and restart Virtuoso.
  • in reply to Andrew Beckett

    Thank you for the suggestion, but unfortunately we can't create a new case with our Cadence support subscription.

  • Hi,

    there were some Matlab related fixes in ISR33. If you have something reproducible, can you try again with ISR33/ISR34 ?

    Kind regards,

    Marc

  • in reply to Marc Heise

    Sorry, I saw that "29"  and took it as ISR29.   23.1. ISR2  should have these fixes already.  Strange.

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