[fedora-electronic-lab] Fwd: [Ngspice-users] ngspice simulation speed

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FYI, our ngspice package is compiled with xspice enabled


---------- Forwarded message ----------
From: Holger Vogt <>
Date: Sun, Jul 11, 2010 at 7:55 PM
Subject: [Ngspice-users] ngspice simulation speed
To: Ngspice users mailing list <n>


Hi all,

if you have XSPICE enabled during compilation, you will experience a
doubling of time steps (and cpu time) required during transient
simulation compared to spice3f.

This is caused by the value of trtol, which is internally set to 1
(instead of standard 7), if XSPICE is compiled in.

So if you do not use XSPICE devices (named a...) or the poly option in
voltage sources, you might set
.option trtol=7
in your input file and gain a factor of two in speed.

Momentarily there is no way to set this value in spinit or .spiceinit.

Regards

Holger


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