User manual

Dymola 2015 FD01 Release Notes 19
The method for parallelization is described in the paper: H. Elmqvist, S.E. Mattsson and H.
Olsson: “Parallel Model Execution on many cores”, Proceedings of the 10th Internal
Modelica Conference:
https://www.modelica.org/events/modelica2014/proceedings/html/submissions/ECP140963
63_ElmqvistMattssonOlsson.pdf
This paper includes successful uses from the thermodynamic and the electrical domains
giving speed-ups of 2.9-3.4 on a quad-core machine.
It should be noted that for many kinds of models the internal dependencies don’t allow
efficient parallelization for getting any substantial speed-up.
More efficient event handling
Setting the flag
Advanced.EfficientMinorEvents = true;
activates more efficient handling of “minor” events.
These are events that either do not influence the continuous model at all (these events will
be skipped; this is likely to occur when sub-sampling signals in synchronous models), or
events that do not require a new Jacobian (sampled input to a continuous model; not
implemented yet for lsodar and dassl).
The efficient event handling is not approximate in itself, but due to fewer Jacobians and
slight changes in the simulation intervals for the numerical solvers, the results may change
within the tolerance.
3.3.2 Interactive parameter tuning
Dymola now supports interactive tuning of parameters during simulation runs. The
functionality is enabled setting the flag
Advanced.OnlineParameterChanges = true;
Setting this flag allows synchronized online parameter tuning changes both from the
variable browser and from the parameter dialog of the diagram view in simulation mode.
Note. A tunable parameter is an interactive parameter that influences simulation parameters
(parameters that appear in simulation equations), but that does not influence parameters
which either specify fixed=false or that appear in equations differentiated by Pantelides’
algorithm.
3.3.3 Plot window
Improved export of plot images
In Dymola 2015 FD01, images of plots can be exported also to SVG files, using the
command
File > Export > Image…; see “Improved export of images of diagram/icon layer”
on page 14 for image.