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Simulators >> Circuit Simulators >> Running multiple montecarlo analysis from 1 file
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Message started by vikas on Jun 27^th, 2004, 4:10am

Title: Running multiple montecarlo analysis from 1 file
Post by vikas on Jun 27^th, 2004, 4:10am

Hello all,

I am trying to run multiple montecarlo simulation(with diff seed value) from same input file. I do'nt see if i can define a seed from GUI. So I manually edit the input file, and add multiple analysis. After some syntex eror i got simulation working.

My problem is i am not able to see the family curve for each MC analysis.I have given output file different name ,but still can see only one curve for each analysis.

Can anybody suggest me how can i see the family of curves?I am sure there has to be a way of seeing all the curve.My input file somewhat looks like this......

simulator lang=spectre
global 0 vdd!
include "all model file"

netlist with subcircuit definition
simulatorOptions ------

mc1 montecarlo numruns=10 seed=1 variations=process donominal=yes \
scalarfile="../monteCarlo/mcdata1" paramfile="../monteCarlo/mcparam1" \
saveprocessparams=yes processparamfile="../monteCarlo/processParam1" \
processscalarfile="../monteCarlo/processData1" savefamilyplots=yes {
tran1 tran stop=350n write="spectre1.ic" writefinal="spectre1.fc".....
pss1 ( net54 net53 ) pss fund=2.4G harms=5 errpreset=moderate....
pnoise1 ( net54 net53 ) pnoise sweeptype=relative....
modelParameter1 info what=models where=rawfile
element1 info what=inst where=rawfile
outputParameter1 info what=output where=rawfile
export noExprs1=oceanEval("0")
}
saveOptions1 options save=allpub

mc2 montecarlo numruns=10 seed=2 variations=process donominal=yes \
scalarfile="../monteCarlo/mcdata2" paramfile="../monteCarlo/mcparam2" \
saveprocessparams=yes processparamfile="../monteCarlo/processParam2" \
processscalarfile="../monteCarlo/processData2" savefamilyplots=yes {
tran2 tran stop=350n write="spectre.ic" writefinal="spectre.fc" .....
pss2 ( net54 net53 ) pss fund=2.4G harms=5 errpreset=moderate...
pnoise2 ( net54 net53 ) pnoise sweeptype=relative.....
modelParameter2 ....
}
saveOptions2 options save=allpub

--Regards,
Vikas

Title: Re: Running multiple montecarlo analysis from 1 fi
Post by Andrew Beckett on Jun 27^th, 2004, 10:09pm

Vikas,

There is a PCR filed for getting the seed value onto the monte carlo UI in ADE.

Almost certainly the problem is that the user interface doesn't expect more than one run in the netlist - and consequently, it doesn't know what the output psf data is called, so doesn't know how to plot it.

Regards,

Andrew.

Title: Re: Running multiple montecarlo analysis from 1 fi
Post by vikas on Jun 30^th, 2004, 5:28pm

Hello Andrew,

Thanks for the reply.
But from the simlulator perspective ,I wish if one can store and later on view the results from each run.

Regards,
--Vikas

Title: Re: Running multiple montecarlo analysis from 1 fi
Post by Andrew Beckett on Jun 30^th, 2004, 9:40pm

What you could always do is to run one monte-carlo run at a time (via ADE, having hacked the netlist to change the seed), and then do a results->Save in the ADE window to save the whole run directory to another name.

Having done that you can then select a particular set of previously run results by doing results->select

BTW, why do you want to set the seed? An alternative to setting the seed might be to set the number of the first run - it means you've got the same seed, but you're further down the sequence of random numbers, which would effectively have the same effect (of course, making sure that your starting run number is greater than the number of runs in the first monte-carlo so the results don't overlap).

Regards,

Andrew.