Chapter 9 Modelica Performance Analyzer

Chapter 9

Modelica Performance Analyzer

When running a simulation for performance analysis, execution times of user-defined functions as well as linear, non-linear and mixed equation systems are recorded.

To start a simulation in this mode, just use the measureTime flag of the simulate command.

simulate(modelname, measureTime = true)

The generated report is in HTML format (with images in the SVG format), stored in a file modelname_prof.html, but the XML database and measured times that generated the report and graphs are also available if you want to customize the report for comparison with other tools.

Below we use the performance profiler on the simple model A:

model A

function f

input Real r;

output Real o := sin(r);

end f;

String s = "abc";

Real x = f(x) "This is x";

Real y(start=1);

Real z1 = cos(z2);

Real z2 = sin(z1);

der(y) = time;

We simulate as usual, but set measureTime=true to activate the profiling:

9.1Example Report Generated for the A Model

9.1.1Information

All times are measured using a real-time wall clock. This means context switching produces bad worst-case execution times (max times) for blocks. If you want better results, use a CPU-time clock or run the command using real-time priviliges (avoiding context switches).

Note that for blocks where the individual execution time is close to the accuracy of the real-time clock, the maximum measured time may deviate a lot from the average.

For more details, see the generated file A_prof.xml, shown in Section 9.1.7 below.

9.1.2Settings

The settings for the simulation are summarized in the table below:

Name	Value
Integration method	euler
Output format	mat
Output name	A_res.mat
Output size	24.0 kB
Profiling data	A_prof.data
Profiling size	27.3 kB

9.1.3Summary

Execution times for different activities:

Task	Time	Fraction
Pre-Initialization	0.000401	19.17%
Initialization	0.000046	2.20%
Event-handling	0.000036	1.72%
Creating output file	0.000264	12.62%
Linearization	0.000000	0.00%
Time steps	0.001067	51.00%
Overhead	0.000273	13.05%
Unknown	0.000406	0.24%
Total simulation time	0.002092	100.00%

9.1.4Global Steps

	Steps	Total Time	Fraction	Average Time	Max Time	Deviation
	499	0.001067	51.00%	2.13827655310621e-06	0.000006611	2.09x

9.1.5Measured Function Calls

	Name	Calls	Time	Fraction	Max Time	Deviation
	A.f	1506	0.000092990	4.45%	0.000000448	6.26x

9.1.6Measured Blocks

	Name	Calls	Time	Fraction	Max Time	Deviation
	residualFunc3	2018	0.000521137	24.91%	0.000035456	136.30x
	residualFunc1	1506	0.000393709	18.82%	0.000002735	9.46x

9.1.6.1Equations

Name	Variables
SES_ALGORITHM 0
SES_SIMPLE_ASSIGN 1	der(y)
residualFunc3	z2, z1
residualFunc1	x

9.1.6.2Variables

Name	Comment
y
der(y)
x	This is x
z1
z2
s

9.1.7Genenerated XML for the Example

-

-

A

A

2011-03-07 12:55:53

euler

mat

A_res.mat

24617

0.000273

0.000401

0.000046

0.000036

0.000264

0.000000

0.002092

0.001067

499

0.000006611

-

A_prof.data

28000

-

step

time

cpu time

A.f (calls)

residualFunc3 (calls)

residualFunc1 (calls)

A.f (cpu time)

residualFunc3 (cpu time)

residualFunc1 (cpu time)


-

-

-

-

-

-

-

-

-

A.f

1506

0.000092990

0.000000448

-

-

-

-

-

-

-

-

-

-




2018

0.000521137

0.000035456
-




1506

0.000393709

0.000002735

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