Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo", uses=false) Using package Buildings with version 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Running command: translateModel(Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface") translateModel(Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0008281/0.0008284, allocations: 92 kB / 15.06 MB, free: 1.098 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.0009194/0.0009195, allocations: 172.7 kB / 15.95 MB, free: 208 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.681/1.681, allocations: 205.4 MB / 222.1 MB, free: 5.668 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.57/1.57, allocations: 252 MB / 0.5102 GB, free: 4.848 MB / 414.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.0007783/0.0007785, allocations: 16 kB / 0.6243 GB, free: 1.145 MB / 0.5137 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.5819/0.5827, allocations: 106.3 MB / 0.7281 GB, free: 11.54 MB / 0.545 GB Notification: Performance of NFInst.instantiate(Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface): time 0.005433/0.5882, allocations: 4.32 MB / 0.7323 GB, free: 7.207 MB / 0.545 GB Notification: Performance of NFInst.instExpressions: time 0.1534/0.7417, allocations: 136.8 MB / 0.8659 GB, free: 14.06 MB / 0.6856 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001027/0.7428, allocations: 19.88 kB / 0.8659 GB, free: 14.04 MB / 0.6856 GB Notification: Performance of NFTyping.typeComponents: time 0.0005392/0.7433, allocations: 146.8 kB / 0.866 GB, free: 13.89 MB / 0.6856 GB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/BoundaryConditions/WeatherData/BaseClasses/getHeaderElementTMY3.mo:2:1-105:25:writable] Warning: Pure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3‘ contains a call to impure function ‘Modelica.Utilities.Streams.readLine‘. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/BoundaryConditions/WeatherData/BaseClasses/getLongitudeTMY3.mo:2:1-48:21:writable] Warning: Pure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getLongitudeTMY3‘ contains a call to impure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3‘. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/BoundaryConditions/WeatherData/BaseClasses/getLatitudeTMY3.mo:2:1-48:20:writable] Warning: Pure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getLatitudeTMY3‘ contains a call to impure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3‘. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/BoundaryConditions/WeatherData/BaseClasses/getTimeZoneTMY3.mo:2:1-47:20:writable] Warning: Pure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getTimeZoneTMY3‘ contains a call to impure function ‘Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3‘. Notification: Performance of NFTyping.typeBindings: time 0.001449/0.7448, allocations: 428 kB / 0.8665 GB, free: 13.48 MB / 0.6856 GB Notification: Performance of NFTyping.typeClassSections: time 0.001769/0.7465, allocations: 0.684 MB / 0.8671 GB, free: 12.8 MB / 0.6856 GB Notification: Performance of NFFlatten.flatten: time 0.001463/0.748, allocations: 1.338 MB / 0.8684 GB, free: 11.45 MB / 0.6856 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001113/0.7491, allocations: 0.883 MB / 0.8693 GB, free: 10.55 MB / 0.6856 GB Notification: Performance of NFEvalConstants.evaluate: time 0.0006486/0.7498, allocations: 417.8 kB / 0.8697 GB, free: 10.14 MB / 0.6856 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0005175/0.7503, allocations: 469.3 kB / 0.8701 GB, free: 9.676 MB / 0.6856 GB Notification: Performance of NFPackage.collectConstants: time 7.926e-05/0.7504, allocations: 28 kB / 0.8702 GB, free: 9.648 MB / 0.6856 GB Notification: Performance of NFFlatten.collectFunctions: time 0.0006324/0.7511, allocations: 267.7 kB / 0.8704 GB, free: 9.387 MB / 0.6856 GB Notification: Performance of NFScalarize.scalarize: time 0.0002198/0.7513, allocations: 226.9 kB / 0.8706 GB, free: 9.164 MB / 0.6856 GB Notification: Performance of NFVerifyModel.verify: time 0.0002164/0.7515, allocations: 264.9 kB / 0.8709 GB, free: 8.898 MB / 0.6856 GB Notification: Performance of NFConvertDAE.convert: time 0.001387/0.7529, allocations: 1.629 MB / 0.8725 GB, free: 7.266 MB / 0.6856 GB Notification: Performance of FrontEnd - DAE generated: time 5.04e-06/0.7529, allocations: 0 / 0.8725 GB, free: 7.266 MB / 0.6856 GB Notification: Performance of FrontEnd: time 1.663e-06/0.7529, allocations: 0 / 0.8725 GB, free: 7.266 MB / 0.6856 GB Notification: Performance of Transformations before backend: time 2.094e-05/0.753, allocations: 0 / 0.8725 GB, free: 7.266 MB / 0.6856 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 364 * Number of variables: 364 Notification: Performance of Generate backend data structure: time 0.002485/0.7554, allocations: 1.482 MB / 0.8739 GB, free: 5.73 MB / 0.6856 GB Notification: Performance of prepare preOptimizeDAE: time 3.452e-05/0.7555, allocations: 11.97 kB / 0.8739 GB, free: 5.719 MB / 0.6856 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0009108/0.7564, allocations: 253.8 kB / 0.8742 GB, free: 5.469 MB / 0.6856 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.00123/0.7576, allocations: 0.8719 MB / 0.875 GB, free: 4.555 MB / 0.6856 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001383/0.7578, allocations: 132.6 kB / 0.8752 GB, free: 4.418 MB / 0.6856 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001525/0.758, allocations: 140 kB / 0.8753 GB, free: 4.281 MB / 0.6856 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00244/0.7604, allocations: 1.42 MB / 0.8767 GB, free: 2.805 MB / 0.6856 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.712e-05/0.7604, allocations: 3.938 kB / 0.8767 GB, free: 2.801 MB / 0.6856 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001206/0.7606, allocations: 60 kB / 0.8767 GB, free: 2.742 MB / 0.6856 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 2.999e-05/0.7606, allocations: 39.89 kB / 0.8768 GB, free: 2.703 MB / 0.6856 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002348/0.763, allocations: 1.462 MB / 0.8782 GB, free: 1.234 MB / 0.6856 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.006033/0.769, allocations: 3.784 MB / 0.8819 GB, free: 13.38 MB / 0.7012 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001503/0.7706, allocations: 0.9153 MB / 0.8828 GB, free: 12.45 MB / 0.7012 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0005727/0.7711, allocations: 367.7 kB / 0.8831 GB, free: 12.09 MB / 0.7012 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0001079/0.7713, allocations: 45.06 kB / 0.8832 GB, free: 12.04 MB / 0.7012 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0009837/0.7723, allocations: 0.5436 MB / 0.8837 GB, free: 11.48 MB / 0.7012 GB Notification: Performance of pre-optimization done (n=93): time 2.675e-06/0.7723, allocations: 4 kB / 0.8837 GB, free: 11.48 MB / 0.7012 GB Notification: Performance of matching and sorting (n=93): time 0.003211/0.7755, allocations: 1.377 MB / 0.8851 GB, free: 10.07 MB / 0.7012 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001051/0.7756, allocations: 192.9 kB / 0.8852 GB, free: 9.844 MB / 0.7012 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001001/0.7766, allocations: 0.7354 MB / 0.886 GB, free: 9.094 MB / 0.7012 GB Notification: Performance of collectPreVariables (initialization): time 9.78e-05/0.7767, allocations: 45.7 kB / 0.886 GB, free: 9.043 MB / 0.7012 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005096/0.7772, allocations: 0.5737 MB / 0.8866 GB, free: 8.461 MB / 0.7012 GB Notification: Performance of collectInitialBindings (initialization): time 0.0003/0.7776, allocations: 319.5 kB / 0.8869 GB, free: 8.145 MB / 0.7012 GB Notification: Performance of simplifyInitialFunctions (initialization): time 4.869e-05/0.7776, allocations: 12 kB / 0.8869 GB, free: 8.133 MB / 0.7012 GB Notification: Performance of setup shared object (initialization): time 0.0001303/0.7778, allocations: 349.9 kB / 0.8872 GB, free: 7.785 MB / 0.7012 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0006225/0.7784, allocations: 325.8 kB / 0.8875 GB, free: 7.465 MB / 0.7012 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0006755/0.7791, allocations: 443.9 kB / 0.888 GB, free: 7.016 MB / 0.7012 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0006711/0.7798, allocations: 382.9 kB / 0.8883 GB, free: 6.645 MB / 0.7012 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.837e-06/0.7798, allocations: 0 / 0.8883 GB, free: 6.645 MB / 0.7012 GB Notification: Performance of matching and sorting (n=113) (initialization): time 0.002083/0.7819, allocations: 1.028 MB / 0.8893 GB, free: 5.602 MB / 0.7012 GB Notification: Performance of prepare postOptimizeDAE: time 2.001e-05/0.7819, allocations: 4 kB / 0.8893 GB, free: 5.598 MB / 0.7012 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.588e-06/0.7819, allocations: 4 kB / 0.8893 GB, free: 5.594 MB / 0.7012 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0005523/0.7825, allocations: 84.86 kB / 0.8894 GB, free: 5.508 MB / 0.7012 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008122/0.7833, allocations: 199.7 kB / 0.8896 GB, free: 5.312 MB / 0.7012 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002117/0.7854, allocations: 1.536 MB / 0.8911 GB, free: 3.641 MB / 0.7012 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007887/0.7862, allocations: 103.1 kB / 0.8912 GB, free: 3.539 MB / 0.7012 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.211e-05/0.7863, allocations: 48.03 kB / 0.8912 GB, free: 3.492 MB / 0.7012 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 5 * Number of states: 0 () * Number of discrete variables: 8 ($whenCondition2,$whenCondition1,$PRE.weaDat.conTimMin.tNext,weaDat.conTimMin.tNext,$PRE.weaDat.conTim.tNext,weaDat.conTim.tNext,weaDat.conTimMin.canRepeatWeatherFile,weaDat.conTim.canRepeatWeatherFile) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (111): * Single equations (assignments): 110 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 2} Notification: Performance of prepare postOptimizeDAE: time 0.0006207/0.787, allocations: 325.8 kB / 0.8916 GB, free: 3.164 MB / 0.7012 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001615/0.7871, allocations: 98.81 kB / 0.8917 GB, free: 3.066 MB / 0.7012 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.002719/0.7899, allocations: 1.309 MB / 0.8929 GB, free: 1.738 MB / 0.7012 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.188e-05/0.7899, allocations: 12 kB / 0.8929 GB, free: 1.727 MB / 0.7012 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.697e-06/0.7899, allocations: 4 kB / 0.8929 GB, free: 1.723 MB / 0.7012 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.081e-05/0.7899, allocations: 3.984 kB / 0.8929 GB, free: 1.719 MB / 0.7012 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.00377/0.7937, allocations: 2.49 MB / 0.8954 GB, free: 15.17 MB / 0.7169 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.839e-06/0.7937, allocations: 0 / 0.8954 GB, free: 15.17 MB / 0.7169 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.00073/0.7945, allocations: 183.7 kB / 0.8956 GB, free: 14.99 MB / 0.7169 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0004673/0.7949, allocations: 88.75 kB / 0.8956 GB, free: 14.9 MB / 0.7169 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 6.031e-05/0.795, allocations: 27.98 kB / 0.8957 GB, free: 14.87 MB / 0.7169 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001794/0.7968, allocations: 1.559 MB / 0.8972 GB, free: 13.17 MB / 0.7169 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.523e-06/0.7968, allocations: 0 / 0.8972 GB, free: 13.17 MB / 0.7169 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002189/0.799, allocations: 1.109 MB / 0.8983 GB, free: 12.04 MB / 0.7169 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005105/0.7995, allocations: 343.3 kB / 0.8986 GB, free: 11.69 MB / 0.7169 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001259/0.7997, allocations: 32.05 kB / 0.8986 GB, free: 11.66 MB / 0.7169 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006718/0.8004, allocations: 75.94 kB / 0.8987 GB, free: 11.58 MB / 0.7169 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001444/0.8005, allocations: 72.89 kB / 0.8988 GB, free: 11.51 MB / 0.7169 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 8.812e-05/0.8006, allocations: 39.98 kB / 0.8988 GB, free: 11.47 MB / 0.7169 GB Notification: Performance of sorting global known variables: time 0.0007432/0.8014, allocations: 0.5381 MB / 0.8993 GB, free: 10.94 MB / 0.7169 GB Notification: Performance of sort global known variables: time 1.71e-07/0.8014, allocations: 0 / 0.8993 GB, free: 10.94 MB / 0.7169 GB Notification: Performance of remove unused functions: time 0.001082/0.8025, allocations: 378.6 kB / 0.8997 GB, free: 10.57 MB / 0.7169 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 0 () * Number of discrete variables: 4 ($whenCondition2,$whenCondition1,weaDat.conTimMin.tNext,weaDat.conTim.tNext) * Number of discrete states: 2 (weaDat.conTim.tNext,weaDat.conTimMin.tNext) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (107): * Single equations (assignments): 104 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 2 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 3} Notification: Performance of Backend phase and start with SimCode phase: time 0.001197/0.8037, allocations: 0.565 MB / 0.9002 GB, free: 10.18 MB / 0.7169 GB Notification: Performance of simCode: created initialization part: time 0.001929/0.8056, allocations: 0.968 MB / 0.9012 GB, free: 9.203 MB / 0.7169 GB Notification: Performance of simCode: created event and clocks part: time 3.868e-06/0.8056, allocations: 0 / 0.9012 GB, free: 9.203 MB / 0.7169 GB Notification: Performance of simCode: created simulation system equations: time 0.0009427/0.8066, allocations: 0.5938 MB / 0.9018 GB, free: 8.598 MB / 0.7169 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001242/0.8078, allocations: 270.8 kB / 0.902 GB, free: 8.336 MB / 0.7169 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.005067/0.8129, allocations: 2.912 MB / 0.9049 GB, free: 5.395 MB / 0.7169 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007776/0.8137, allocations: 1.165 MB / 0.906 GB, free: 4.203 MB / 0.7169 GB Notification: Performance of simCode: alias equations: time 0.001097/0.8148, allocations: 283.7 kB / 0.9063 GB, free: 3.922 MB / 0.7169 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003037/0.8151, allocations: 135.2 kB / 0.9064 GB, free: 3.789 MB / 0.7169 GB Notification: Performance of SimCode: time 9.42e-07/0.8151, allocations: 0 / 0.9064 GB, free: 3.789 MB / 0.7169 GB Notification: Performance of Templates: time 0.4553/1.27, allocations: 15.6 MB / 0.9216 GB, free: 174.8 MB / 0.7169 GB make -j1 -f Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.makefile Environment - environmentSimulation: (rm -f Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.pipe >> ../files/Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.sim & ./Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_maint.7.0.x_Buildings.BoundaryConditions.SolarIrradiation.Examples.DirectTiltedSurface.pipe 2>&1) Environment - environmentSimulation: