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ADE XL Monte Carlo Simulation: "Error evaluating ocean expression"

lperktold
 Hello All,

 I am experiencing a rather strange behavior of ADE XL when it comes to evaluate the expressions defined in the
'Outputs Setup' section during a monte carlo run.

 The simulation stops (after the first run has finished) with an error like:

 ERROR (SPECTRE-8003): designParamVals: Error evaluating ocean expression `DE_1_I_Bias_6_45=average(IT("/I0/I0/I0/T7/D"))'.

 If I disable all the expressions in the 'Outputs Setup' pane the simulation runs fine. I can then use the 'Re-evaluate Result' button in the 'Results' pane to evaluate my defined expressions without any problems.

 I am using

- Spectre Version 7.1.1.187.isr11 64bit -- 18 Aug 2009
- Virtuoso version IC6.1.4.500.3

 Anybody else, experiencing this kind of strange behavior?

Cheers,
         Lukas

  •  Thanks. But my account doesn't have facility to file a service request.

     Regarding the directory structure - I have tried it out. Don't think that the directory structure is the problem since then it would have failed when invoked from the command line as well.

     One thing that I noticed. The .ahdlSimDB directory gets created when run in command line, but not when run through the program. Although, in both cases, I see that the directory creation log is present in the log file.

    I am strongly suspecting a file system flushing error.

  • That sounds odd. Can't really see how that would happen (or how file system flushing could stop the .ahdlSimDB from being created). Is it really running the simulation you think it is, in the right directory?

    Andrew.

  • Wow! That (simulation not running in the correct directory) is a clue! Let me check it out. Thanks for the suggestion.

  •  That was indeed the case. If I invoke the commands from a different directory than where the input file is (even though I mention fully qualified paths), the commands fail. I could reproduce the failure from the command line as well. So, I have added a chdir() to my program before it invokes spectre, and now things work.

     Thanks a bunch.

  • Hey Ramadan.

    I'm using the same cadence version. It is true that the "Run Nominal Simulation" option isn't available here.

    What you need to do is go to the ADE and choose Outputs->Save All... and then check "all" under the "Select signals to output (save)".
    The problem is that the monte-carlo is throwing away important initial information between the runs, so the outputs can't be computed, if you haven't checked "all".

     Best regards Martin 

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