[Help-gnucap] computing time

[Romain GAILLETON]

Hi,

I’m currently working on an electrical simulation project.
There is about 4000 real nodes in the project, and about 8000 more 
nodes for controlling the switches.

Our problem is the computing time which is really too important:
The computing time is about 0.5s after the closing/opening of a switch 
which does not affect the rest of the electric scheme. This computing 
time can reach more than 20s for any component which have great 
electrical consequences on the scheme.
Before consider the following questions, you have to know that we don’t 
care of the accuracy of the voltage calculated. We are working on a 110V 
scheme and we just want to know if the wire are undervoltage or not (the 
voltage are binarize by another application).
I would like to ask the several questions:
1.      Which parameters can we use for reduce this computing time?
2.	Is there an option which would allow Gnucap to recalculate only the 
nodes where the voltage have changed?
3.	Is there an option which could allow us to send to the output only 
the nodes which are in a range?
Example: “print tran v(nodes) “  Which nodes are between 0 to 4000

4.      Is the time given by acct the real computing time?
5.	Could it be possible to reduce the computing time under 500ms in 
your opinion?

We currently use the command “tran 0 0.15 0.15” then tran after any 
change on a component.
Parameters are : method=euler     outwidth=1000000    acct=1

Thank you for your time.