Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr ThermoPower_ThermoPower.Test.GasComponents.TestCC.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/ThermoPower 3.1.0-master/package.mo", uses=false)
Using package ThermoPower with version 3.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ThermoPower 3.1.0-master/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: "" <> buildModelFMU(ThermoPower.Test.GasComponents.TestCC,fileNamePrefix="ThermoPower_ThermoPower_Test_GasComponents_TestCC",fmuType="me",version="2.0",platforms={"static"})
"" <> buildModelFMU(ThermoPower.Test.GasComponents.TestCC,fileNamePrefix="ThermoPower_ThermoPower_Test_GasComponents_TestCC",fmuType="me",version="2.0",platforms={"static"})
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.00142/0.00142, allocations: 92.41 kB / 16.3 MB, free: 5.996 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.002045/0.002045, allocations: 184.4 kB / 17.2 MB, free: 5.91 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.956/1.956, allocations: 205.4 MB / 223.4 MB, free: 5.523 MB / 174.1 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ThermoPower 3.1.0-master/package.mo): time 0.4815/0.4815, allocations: 48.77 MB / 320.4 MB, free: 3.824 MB / 254.1 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 0.0006662/0.0006664, allocations: 20 kB / 391.2 MB, free: 14.22 MB / 334.1 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.1397/0.1404, allocations: 60.25 MB / 451.5 MB, free: 1.832 MB / 382.1 MB
Notification: Performance of NFInst.instantiate(ThermoPower.Test.GasComponents.TestCC): time 0.4756/0.6161, allocations: 158.8 MB / 0.596 GB, free: 14.29 MB / 478.1 MB
Notification: Performance of NFInst.instExpressions: time 0.003652/0.6198, allocations: 1.999 MB / 0.5979 GB, free: 12.29 MB / 478.1 MB
Notification: Performance of NFInst.updateImplicitVariability: time 0.0005603/0.6204, allocations: 15.88 kB / 0.5979 GB, free: 12.27 MB / 478.1 MB
Notification: Performance of NFTyping.typeComponents: time 0.001155/0.6215, allocations: 390.2 kB / 0.5983 GB, free: 11.89 MB / 478.1 MB
Notification: Performance of NFTyping.typeBindings: time 0.001126/0.6227, allocations: 0.4908 MB / 0.5988 GB, free: 11.4 MB / 478.1 MB
Notification: Performance of NFTyping.typeClassSections: time 0.00241/0.6251, allocations: 0.8706 MB / 0.5996 GB, free: 10.54 MB / 478.1 MB
Notification: Performance of NFFlatten.flatten: time 0.001881/0.627, allocations: 1.223 MB / 0.6008 GB, free: 9.316 MB / 478.1 MB
Notification: Performance of NFFlatten.resolveConnections: time 0.001193/0.6282, allocations: 0.7617 MB / 0.6016 GB, free: 8.559 MB / 478.1 MB
Notification: Performance of NFEvalConstants.evaluate: time 0.001674/0.6299, allocations: 0.8454 MB / 0.6024 GB, free: 7.711 MB / 478.1 MB
Notification: Performance of NFSimplifyModel.simplify: time 0.0008125/0.6307, allocations: 0.4984 MB / 0.6029 GB, free: 7.211 MB / 478.1 MB
Notification: Performance of NFPackage.collectConstants: time 0.000198/0.6309, allocations: 64 kB / 0.603 GB, free: 7.148 MB / 478.1 MB
Notification: Performance of NFFlatten.collectFunctions: time 0.001904/0.6328, allocations: 0.6906 MB / 0.6036 GB, free: 6.457 MB / 478.1 MB
Notification: Performance of NFScalarize.scalarize: time 0.0006316/0.6335, allocations: 0.5886 MB / 0.6042 GB, free: 5.867 MB / 478.1 MB
Notification: Performance of NFVerifyModel.verify: time 0.0005544/0.634, allocations: 297.1 kB / 0.6045 GB, free: 5.57 MB / 478.1 MB
Notification: Performance of NFConvertDAE.convert: time 0.002159/0.6362, allocations: 1.661 MB / 0.6061 GB, free: 3.914 MB / 478.1 MB
Notification: Performance of FrontEnd - DAE generated: time 3.406e-06/0.6362, allocations: 0 / 0.6061 GB, free: 3.914 MB / 478.1 MB
Notification: Performance of FrontEnd: time 1.934e-06/0.6363, allocations: 0 / 0.6061 GB, free: 3.914 MB / 478.1 MB
Notification: Performance of Transformations before backend: time 3.329e-05/0.6363, allocations: 0 / 0.6061 GB, free: 3.914 MB / 478.1 MB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 289
 * Number of variables: 289
Notification: Performance of Generate backend data structure: time 0.002654/0.6389, allocations: 1.244 MB / 0.6073 GB, free: 2.621 MB / 478.1 MB
Notification: Performance of prepare preOptimizeDAE: time 4.203e-05/0.639, allocations: 11.97 kB / 0.6073 GB, free: 2.609 MB / 478.1 MB
Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0004104/0.6394, allocations: 185.2 kB / 0.6075 GB, free: 2.418 MB / 478.1 MB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001269/0.6407, allocations: 258.4 kB / 0.6078 GB, free: 2.164 MB / 478.1 MB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001388/0.6421, allocations: 0.6212 MB / 0.6084 GB, free: 1.5 MB / 478.1 MB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.807e-05/0.6422, allocations: 82.23 kB / 0.6084 GB, free: 1.418 MB / 478.1 MB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002341/0.6424, allocations: 119.9 kB / 0.6086 GB, free: 1.301 MB / 478.1 MB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.002684/0.6451, allocations: 1.56 MB / 0.6101 GB, free: 15.67 MB / 494.1 MB
Notification: Performance of preOpt findStateOrder (simulation): time 2.32e-05/0.6452, allocations: 4 kB / 0.6101 GB, free: 15.67 MB / 494.1 MB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001533/0.6453, allocations: 61.27 kB / 0.6101 GB, free: 15.61 MB / 494.1 MB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 6.07e-05/0.6454, allocations: 46.19 kB / 0.6102 GB, free: 15.56 MB / 494.1 MB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002137/0.6475, allocations: 1.187 MB / 0.6114 GB, free: 14.37 MB / 494.1 MB
Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts.
Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.01009/0.6576, allocations: 6.486 MB / 0.6177 GB, free: 7.242 MB / 494.1 MB
Notification: Performance of preOpt comSubExp (simulation): time 0.001173/0.6588, allocations: 0.5349 MB / 0.6182 GB, free: 6.703 MB / 494.1 MB
Notification: Performance of preOpt evalFunc (simulation): time 6.533e-05/0.6589, allocations: 16.55 kB / 0.6182 GB, free: 6.688 MB / 494.1 MB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.337e-05/0.659, allocations: 55.08 kB / 0.6183 GB, free: 6.625 MB / 494.1 MB
Notification: Performance of pre-optimization done (n=58): time 3.236e-06/0.659, allocations: 0 / 0.6183 GB, free: 6.625 MB / 494.1 MB
Notification: Performance of matching and sorting (n=69): time 0.01193/0.6709, allocations: 3.791 MB / 0.622 GB, free: 2.738 MB / 494.1 MB
Notification: Performance of inlineWhenForInitialization (initialization): time 8.523e-05/0.6711, allocations: 107.4 kB / 0.6221 GB, free: 2.609 MB / 494.1 MB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001178/0.6723, allocations: 0.899 MB / 0.623 GB, free: 1.699 MB / 494.1 MB
Notification: Performance of collectPreVariables (initialization): time 0.0001635/0.6724, allocations: 49.7 kB / 0.623 GB, free: 1.645 MB / 494.1 MB
Notification: Performance of collectInitialEqns (initialization): time 0.0003566/0.6728, allocations: 475.4 kB / 0.6235 GB, free: 1.172 MB / 494.1 MB
Notification: Performance of collectInitialBindings (initialization): time 0.0002184/0.673, allocations: 244.5 kB / 0.6237 GB, free: 0.9297 MB / 494.1 MB
Notification: Performance of simplifyInitialFunctions (initialization): time 5.455e-05/0.6731, allocations: 16 kB / 0.6237 GB, free: 0.9141 MB / 494.1 MB
Notification: Performance of setup shared object (initialization): time 0.0001518/0.6732, allocations: 341.9 kB / 0.624 GB, free: 0.5742 MB / 494.1 MB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0007495/0.674, allocations: 449.8 kB / 0.6245 GB, free: 140 kB / 494.1 MB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.2747/0.9487, allocations: 0.5907 MB / 0.625 GB, free: 56.42 MB / 494.1 MB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0007709/0.9496, allocations: 0.5145 MB / 0.6255 GB, free: 56.41 MB / 494.1 MB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.679e-06/0.9496, allocations: 1.938 kB / 0.6255 GB, free: 56.41 MB / 494.1 MB
Notification: Performance of matching and sorting (n=99) (initialization): time 0.002924/0.9525, allocations: 1.6 MB / 0.6271 GB, free: 56.35 MB / 494.1 MB
Notification: Performance of prepare postOptimizeDAE: time 0.0002778/0.9528, allocations: 1.489 MB / 0.6286 GB, free: 54.81 MB / 494.1 MB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.401e-05/0.9528, allocations: 4.469 kB / 0.6286 GB, free: 54.81 MB / 494.1 MB
Notification: Performance of postOpt tearingSystem (initialization): time 0.003268/0.9561, allocations: 0.8777 MB / 0.6294 GB, free: 54.8 MB / 494.1 MB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006287/0.9568, allocations: 121.4 kB / 0.6295 GB, free: 54.8 MB / 494.1 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002284/0.9591, allocations: 2.177 MB / 0.6317 GB, free: 53.7 MB / 494.1 MB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001181/0.9603, allocations: 129.9 kB / 0.6318 GB, free: 53.7 MB / 494.1 MB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001038/0.9604, allocations: 53.36 kB / 0.6318 GB, free: 53.7 MB / 494.1 MB
Notification: Performance of prepare postOptimizeDAE: time 1.637e-05/0.9604, allocations: 4.156 kB / 0.6318 GB, free: 53.7 MB / 494.1 MB
Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.002614/0.963, allocations: 1.428 MB / 0.6332 GB, free: 53.66 MB / 494.1 MB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.18e-05/0.9631, allocations: 4.031 kB / 0.6332 GB, free: 53.66 MB / 494.1 MB
Notification: Performance of postOpt tearingSystem (initialization): time 0.002137/0.9652, allocations: 0.6482 MB / 0.6339 GB, free: 53.65 MB / 494.1 MB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006756/0.9659, allocations: 141 kB / 0.634 GB, free: 53.65 MB / 494.1 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001984/0.9679, allocations: 2.539 MB / 0.6365 GB, free: 51.96 MB / 494.1 MB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001163/0.9691, allocations: 130.6 kB / 0.6366 GB, free: 51.95 MB / 494.1 MB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.545e-05/0.9692, allocations: 44.2 kB / 0.6367 GB, free: 51.95 MB / 494.1 MB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 17
 * Number of states: 0 ()
 * Number of discrete variables: 0 ()
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for initialization (65):
 * Single equations (assignments): 63
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (linear and non-linear blocks): 1
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Equation system details:
 * Constant Jacobian: 0
 * Linear Jacobian (size,density): 0
 * Non-linear Jacobian: 1 {1}
 * Without analytic Jacobian: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems: 0
 * Non-linear torn systems: 1 {9 26}
Notification: Performance of prepare postOptimizeDAE: time 0.0007575/0.97, allocations: 401.9 kB / 0.637 GB, free: 51.77 MB / 494.1 MB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.000216/0.9702, allocations: 99.5 kB / 0.6371 GB, free: 51.77 MB / 494.1 MB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00275/0.973, allocations: 1.274 MB / 0.6384 GB, free: 51.69 MB / 494.1 MB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.687e-05/0.973, allocations: 13.44 kB / 0.6384 GB, free: 51.69 MB / 494.1 MB
Notification: Performance of postOpt constantLinearSystem (simulation): time 7.845e-06/0.973, allocations: 4.594 kB / 0.6384 GB, free: 51.68 MB / 494.1 MB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.224e-05/0.973, allocations: 6.188 kB / 0.6384 GB, free: 51.68 MB / 494.1 MB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004342/0.9774, allocations: 2.32 MB / 0.6407 GB, free: 51.32 MB / 494.1 MB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.584e-06/0.9774, allocations: 2.312 kB / 0.6407 GB, free: 51.32 MB / 494.1 MB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001134/0.9786, allocations: 188.1 kB / 0.6408 GB, free: 51.32 MB / 494.1 MB
Notification: Performance of postOpt tearingSystem (simulation): time 0.001245/0.9798, allocations: 284.9 kB / 0.6411 GB, free: 51.3 MB / 494.1 MB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001062/0.98, allocations: 38.11 kB / 0.6412 GB, free: 51.3 MB / 494.1 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002176/0.9821, allocations: 2.83 MB / 0.6439 GB, free: 48.96 MB / 494.1 MB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.267e-06/0.9822, allocations: 1.516 kB / 0.6439 GB, free: 48.96 MB / 494.1 MB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003225/0.9854, allocations: 1.733 MB / 0.6456 GB, free: 48.63 MB / 494.1 MB
Notification: Performance of postOpt removeConstants (simulation): time 0.0004976/0.9859, allocations: 183.5 kB / 0.6458 GB, free: 48.49 MB / 494.1 MB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001799/0.9861, allocations: 30.8 kB / 0.6458 GB, free: 48.48 MB / 494.1 MB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001286/0.9874, allocations: 115.2 kB / 0.6459 GB, free: 48.48 MB / 494.1 MB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001878/0.9876, allocations: 63.16 kB / 0.646 GB, free: 48.47 MB / 494.1 MB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001749/0.9878, allocations: 65.67 kB / 0.646 GB, free: 48.47 MB / 494.1 MB
Notification: Performance of sorting global known variables: time 0.001088/0.9889, allocations: 0.6295 MB / 0.6467 GB, free: 48.38 MB / 494.1 MB
Notification: Performance of sort global known variables: time 2.5e-07/0.9889, allocations: 0.5625 kB / 0.6467 GB, free: 48.38 MB / 494.1 MB
Notification: Performance of remove unused functions: time 0.002196/0.9911, allocations: 0.6333 MB / 0.6473 GB, free: 48.38 MB / 494.1 MB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 5
 * Number of states: 7 (CombustionChamber1.fluegas.p,CombustionChamber1.fluegas.Xi[1],CombustionChamber1.fluegas.Xi[2],CombustionChamber1.fluegas.Xi[3],CombustionChamber1.fluegas.Xi[4],CombustionChamber1.fluegas.Xi[5],CombustionChamber1.fluegas.T)
 * Number of discrete variables: 0 ()
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for simulation (63):
 * Single equations (assignments): 60
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (linear and non-linear blocks): 1
 * Torn equation systems: 2
 * Mixed (continuous/discrete) equation systems: 0
Notification: Equation system details:
 * Constant Jacobian: 0
 * Linear Jacobian (size,density): 0
 * Non-linear Jacobian: 1 {1}
 * Without analytic Jacobian: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems: 1 {(1,100.0%) 1}
 * Non-linear torn systems: 1 {2 11}
Notification: Performance of Backend phase and start with SimCode phase: time 0.00473/0.9958, allocations: 2.985 MB / 0.6502 GB, free: 47.22 MB / 494.1 MB
Notification: Performance of simCode: created initialization part: time 0.004245/1, allocations: 1.928 MB / 0.6521 GB, free: 47.17 MB / 494.1 MB
Notification: Performance of simCode: created event and clocks part: time 1.411e-05/1, allocations: 12.41 kB / 0.6521 GB, free: 47.17 MB / 494.1 MB
Notification: Performance of simCode: created simulation system equations: time 0.001244/1.001, allocations: 0.6936 MB / 0.6528 GB, free: 47.05 MB / 494.1 MB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003289/1.005, allocations: 0.622 MB / 0.6534 GB, free: 47 MB / 494.1 MB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.006668/1.011, allocations: 6.178 MB / 0.6594 GB, free: 42.66 MB / 494.1 MB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007626/1.012, allocations: 1.123 MB / 0.6605 GB, free: 41.95 MB / 494.1 MB
Notification: Performance of simCode: alias equations: time 0.001801/1.014, allocations: 306.7 kB / 0.6608 GB, free: 41.87 MB / 494.1 MB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0006056/1.015, allocations: 398.3 kB / 0.6612 GB, free: 41.86 MB / 494.1 MB
Notification: Performance of SimCode: time 9.31e-07/1.015, allocations: 2.625 kB / 0.6612 GB, free: 41.86 MB / 494.1 MB
Notification: Performance of buildModelFMU: Generate the FMI files: time 0.05945/1.074, allocations: 43.66 MB / 0.7038 GB, free: 5.684 MB / 494.1 MB
Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001501/1.074, allocations: 196.7 kB / 0.704 GB, free: 5.438 MB / 494.1 MB
Notification: Performance of buildModelFMU: Generate platform static: time 3.967/5.042, allocations: 4 kB / 0.704 GB, free: 5.434 MB / 494.1 MB
(rm -f ThermoPower_ThermoPower.Test.GasComponents.TestCC.pipe ; mkfifo ThermoPower_ThermoPower.Test.GasComponents.TestCC.pipe ; head -c 1048576 < ThermoPower_ThermoPower.Test.GasComponents.TestCC.pipe >> ../files/ThermoPower_ThermoPower.Test.GasComponents.TestCC.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator  --tempDir=temp_ThermoPower_ThermoPower_Test_GasComponents_TestCC_fmu --startTime=0 --stopTime=5 --timeout=50 --tolerance=1e-06 ThermoPower_ThermoPower_Test_GasComponents_TestCC.fmu > ThermoPower_ThermoPower.Test.GasComponents.TestCC.pipe 2>&1)
Environment - environmentSimulation: