<@U01819B63HP> Is there any setting in xschem-ngspice to increase `TRAN` simulation runtime by using...

vks

04/17/2024, 8:29 AM

@Stefan Schippers Is there any setting in xschem-ngspice to increase

TRAN

simulation runtime by using more CPU cores or multi threading ? Any option to reduce

.raw

file output size? For certain simulation it is forming into GB which takes time to load waveforms.

Stefan Schippers

04/17/2024, 8:56 AM

raw size is reduced by saving a selected set of variables. This means: • do not use

.options savecurrents

• do not use

save all

(or

.save all

) • explicitly tell what you want to save, by adding

save v(xxx) i(xxx) .....

lines To indicate voltage nodes you want to save you can use the

spice_probe.sym

component. This will automatically add the .save ... instruction for you.

👍 1

Stefan Schippers

04/17/2024, 8:59 AM

You should have a

.spiceinit

file in the directory where ngspice runs simulations. this line:

set num_threads=4

tells ngspice to use more threads. Don't be too optimistic, the solver is not parallel, increasing threads will give no benefit for the solver. More threads are used to evaluate device equations that usualy takes 50% of total simulation time. Above 4 threads there are no significant advantages in my tests.

👍 1

2 Views

Open in Slack

Previous Next

What is Linen?

Linen is a search-engine friendly community platform. We offer integrations with existing Slack/Discord communities and make those conversations Google-searchable.