Parallel Simulation Error using parfor and parpool
2 views (last 30 days)
Show older comments
Hello,
I try to perform a simulation using the parfor command. My Simulink file changes data every 0.04s up to 3.84s (96 times total). I try to make my simulation a bit faster using parfor and parpool using essentially a timestep of 0.04s. Yet an error, which I quite frankly cannot understand pops out. By the way the simulation without parallel works perfectly. This is the code I use:
% Define the time step and simulation end time
timeStep = 0.04; % Time step (in seconds)
endTime = 3.84; % End time (in seconds)
% Create a parallel pool if not already available
if isempty(gcp('nocreate'))
parpool; % Create a parallel pool
end
% Define a function for simulating the Simulink model for a given time range
simFunc = @(startTime, endTime) simulink_simulation(startTime, endTime);
% Perform parallel simulations
simTimes = 0:timeStep:endTime;
numSimulations = length(simTimes);
parfor i = 1:numSimulations
startTime = simTimes(i);
endTime = startTime + timeStep;
fprintf('Simulation %d: %.2f to %.2f seconds\n', i, startTime, endTime);
% Call the simulation function for the current time range
simFunc(startTime, endTime);
end
% Define the simulink_simulation function
function simulink_simulation(startTime, endTime)
% Load the Simulink model
model = 'zigzag_example_matlab';
load_system(model);
% Set the simulation time range
set_param(model, 'StartTime', num2str(startTime));
set_param(model, 'StopTime', num2str(endTime));
% Run the simulation
simOut = sim(model);
end
And this is the error that pops during simulation:
Simulation 2: 0.04 to 0.08 seconds
Simulation 6: 0.20 to 0.24 seconds
Simulation 8: 0.28 to 0.32 seconds
Simulation 4: 0.12 to 0.16 seconds
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 16.512s
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Analyzing and transferring files to the workers ...done.
Simulation 8: 0.28 to 0.32 seconds
Simulation 6: 0.20 to 0.24 seconds
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
Simulation 4: 0.12 to 0.16 seconds
Simulation 2: 0.04 to 0.08 seconds
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
Warning: The file containing block diagram 'zigzag_example_matlab' has been changed on disk since it was loaded.
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 3.7802s
### Build procedure for zigzag_example_matlab aborted due to an error.
Build Summary
Top model rapid accelerator targets built:
Model Action Rebuild Reason
=================================================================================
zigzag_example_matlab Failed Code generation information file does not exist.
0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 3.7551s
Build duration: 0h 0m 3.8837s
Build duration: 0h 0m 3.886s
Error using Parallel_Simulation_Script>simulink_simulation
Unable to build a standalone executable to simulate the model 'zigzag_example_matlab' in rapid accelerator mode.
Error in Parallel_Simulation_Script>@(startTime,endTime)simulink_simulation(startTime,endTime) (line 11)
simFunc = @(startTime, endTime) simulink_simulation(startTime, endTime);
Error in Parallel_Simulation_Script (line 17)
parfor i = 1:numSimulations
Caused by:
Error using Parallel_Simulation_Script>simulink_simulation
Error due to multiple causes.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/Branch1' for parameter 'SampleTime'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'SampleTime' in 'zigzag_example_matlab/Branch1'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'time'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'time' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/Branch2' for parameter 'SampleTime'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'SampleTime' in 'zigzag_example_matlab/Branch2'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'time'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'time' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/Branch3' for parameter 'SampleTime'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'SampleTime' in 'zigzag_example_matlab/Branch3'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'time'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'time' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/Branch4' for parameter 'SampleTime'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'SampleTime' in 'zigzag_example_matlab/Branch4'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'time'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'time' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/Branch5' for parameter 'SampleTime'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'SampleTime' in 'zigzag_example_matlab/Branch5'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'time'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'time' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'SR888700131'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'SR888700131' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace1' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace1'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'SA888700131'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'SA888700131' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace10' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace10'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'R888700022'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'R888700022' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace11' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace11'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'Load888700022'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'Load888700022' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace2' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace2'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'R888700021'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'R888700021' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace3' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace3'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'Load888700021'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'Load888700021' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace4' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace4'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'R888700024'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'R888700024' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace5' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace5'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'Load888700024'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'Load888700024' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace6' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace6'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'R888700103'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'R888700103' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace7' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace7'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'Load888700103'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'Load888700103' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace8' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace8'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'R888700026'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'R888700026' has been deleted from base workspace.
Error using Parallel_Simulation_Script>simulink_simulation
Invalid setting in 'zigzag_example_matlab/From Workspace9' for parameter 'VariableName'.
Error using Parallel_Simulation_Script>simulink_simulation
Error evaluating parameter 'VariableName' in 'zigzag_example_matlab/From Workspace9'
Error using Parallel_Simulation_Script>simulink_simulation
Unrecognized function or variable 'Load888700026'.
Error using Parallel_Simulation_Script>simulink_simulation
Variable 'Load888700026' has been deleted from base workspace.
Does anyone have any idea what I need to do in order to fix it?
0 Comments
Answers (1)
See Also
Categories
Find more on Deploy Standalone Applications in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!