问题
I am writing this question related to this. In his reply, Marco gave me an excellent answer but, unfortunately, I am new with OpenModelica so I would need some further help.
I am actually using OpenModelica and not Dymola so unfortunately I have to build the function that does it for me and I am very new with OpenModelica language.
So far, I have a model that simulates the physical behavior based on a DAEs. Now, I am trying to build what you suggest here:
With get time() you can build a function that: reads the system time as t_start translates the model and simulate for 0 seconds reads the system time again and as t_stop computes the difference between t_start and t_stop.
Could you please, give me more details: Which command can I use to read the system at time t_start and to simulate it for 0 seconds? To do this for both t_start and t_stop do I need to different function?
Once I have done this, do I have to call the function (or functions) inside the OpenModelica Model of which I want to know its time?
Thank you so much again for your precious help!
Very best regards, Gabriele
回答1:
From the other question:
I noticed in Modelica there are different flags for the simulation time but actually the time I get is very small compared to the time that elapses since I press the simulation button to the end of the simulation (approximately measured with the clock of my phone).
The time that is reported is correct. Most of the time taken is not initialisation or simulation, but compilation. If you use the re-simulate option in OMEdit (right-click a result-file in the plot view for variables), you will notice the simulation is very fast.
$ cat e.mos
loadString("model M
Real r(fixed=true, start=2.0);
equation
der(r) = time;
end M;");getErrorString();
simulate(M);getErrorString();
$ omc e.mos
true
""
record SimulationResult
resultFile = "/mnt/data/@Mech/martin/tmp/M_res.mat",
simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 500, tolerance = 1e-06, method = 'dassl', fileNamePrefix = 'M', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
messages = "LOG_SUCCESS | info | The initialization finished successfully without homotopy method.
LOG_SUCCESS | info | The simulation finished successfully.
",
timeFrontend = 0.004114061,
timeBackend = 0.00237546,
timeSimCode = 0.0008126780000000001,
timeTemplates = 0.062749837,
timeCompile = 0.633754155,
timeSimulation = 0.006627571000000001,
timeTotal = 0.7106012479999999
end SimulationResult;
""
OMEdit does not report these other numbers (time to translate and compile the model) as far as I know. On Windows, these times are quite big because linking takes longer.
来源：https://stackoverflow.com/questions/61593521/follow-up-question-modelica-total-time-calculation-of-simulation-and-equation-i