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Ocean parametric sweep fail due to memory

Peter Madsen

Hi All,

I am running an parametric sweep as a parametric set with a total of 9 sweep parameters. The total number of sweeps are 144

I am running a DC, SP and a two tone HB analysis.

After 122 sweeps the simulation crashes due to memory limitations as spectre alocates 27.9 GB on a 32 GB machine.

This is okay if the analysis needed that amount of RAM, but running the settings for the sweeps as a stand alone simulation uses less than 5 GB

It seems there is a bug in the parametricrun() command as simulation data never leaves memory.

Is there a way force the data out of memory between each run?

Another way of fixing this is to split up the sweep in smaller sweeps  in a for loop, but I would like to avoid this.

I am using spectre version 18.1.0.370.isr7 64-bit

Hope some can help,

Peter

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  • Andrew Beckett

    I'm not sure why the memory should grow - you should contact customer support about that.

    I was thinking that you could just use: envSetVal("spectre.envOpts" "controlMode" 'string "batch")
    at the beginning of your OCEAN script, but with paramset it still runs a s a single invocation of spectre (conventional parametric analysis would invoke spectre separately for each run).

    You could use ADE XL or ADE Assembler instead. You define the individual variables as a list of the values you wish you sweep, and then select the variables in the list of global variables and use Right Mouse->Group as Parametric Set. If you do it this way, each simulation will be an individual run and so the memory should not accumulate.

    Regards,

    Andrew.

  • Peter Madsen
    in reply to Andrew Beckett

    Hi Andrew

    Thanks for your suggestion with the env option. This didn't change the memory growth.

    So I have contacted cadence support.

    Thanks,

    Peter

Reply
  • Peter Madsen
    in reply to Andrew Beckett

    Hi Andrew

    Thanks for your suggestion with the env option. This didn't change the memory growth.

    So I have contacted cadence support.

    Thanks,

    Peter

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