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 Unable to open nodeset file Warning 

Last post Tue, Dec 18 2012 11:32 AM by Eshar. 2 replies.
Started by Eshar 18 Dec 2012 09:57 AM. Topic has 2 replies and 634 views
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  • Tue, Dec 18 2012 9:57 AM

    • Eshar
    • Not Ranked
    • Joined on Sat, May 12 2012
    • Posts 14
    • Points 205
    Unable to open nodeset file Warning Reply

    I have noticed that in my SP simulations the following warning occurs when a DC operating point simulation doesn't precede it:

    WARNING (CMI-2015): Unable to open nodeset file `spectre.dc'. No such file or directory.

     

     Could someone please clarify what the function of the spectre.dc file in performing a SP simulation? Also, why is this a warning instead of an error?

     

    Thanks for the help. 


    • Post Points: 20
  • Tue, Dec 18 2012 10:34 AM

    Re: Unable to open nodeset file Warning Reply

    Most likely you have the readns parameter on one of the analyses (for example the sp analysis) set to "spectre.dc". This tells whichever analysis it is to try to read the nodeset file as a hint for the DC algorithm that precedes the analysis (pretty much every analysis requires a DC operating point to start from, including an S-parameter analysis). If the file is missing, it will solve the DC operating point as usual - the file is just a hint.

    The reason why it's not an error is that quite often you do things like this:

    dc dc readns="spectre.dc" write="spectre.dc"

    Which means the first time it will give you a warning, then write the DC operating point at the end of the simulation. The second run, the file will exist, and it will use that as a starting point. We try to make it not too critical if the file doesn't exist - since it is a hint.

    If you really want it to error out, you can do that by adding this option into your netlist:

    increaseSeverity options warning_change_severity=error warning_id=[CMI-2015]

    And then it will fail:

     Error found by spectre during DC solution estimation, during DC analysis `dc'.
        ERROR (CMI-2015): Unable to open nodeset file `spectre.dc'.
            No such file or directory.

    Regards,

    Andrew.

    • Post Points: 20
  • Tue, Dec 18 2012 11:32 AM

    • Eshar
    • Not Ranked
    • Joined on Sat, May 12 2012
    • Posts 14
    • Points 205
    Re: Unable to open nodeset file Warning Reply
    Makes sense. Thanks.
    • Post Points: 5
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Started by Eshar at 18 Dec 2012 09:57 AM. Topic has 2 replies.