Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.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/ModelicaTest 3.2.2+maint.om/package.mo", uses=false) Using package ModelicaTest with version 3.2.2 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaTest 3.2.2+maint.om/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(ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort") translateModel(ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0009929/0.0009929, allocations: 86.88 kB / 15.06 MB, free: 1.09 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001228/0.001229, allocations: 168.7 kB / 15.95 MB, free: 204 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.951/1.951, allocations: 205.4 MB / 222.1 MB, free: 5.645 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaTest 3.2.2+maint.om/package.mo): time 0.4444/0.4444, allocations: 40 MB / 310.4 MB, free: 10 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: ModelicaTest requested package Modelica of version 3.2.2. Modelica 3.2.3 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.0005704/0.0005704, allocations: 12 kB / 378.8 MB, free: 12.61 MB / 318.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.15/0.1506, allocations: 57.96 MB / 436.8 MB, free: 2.547 MB / 366.1 MB Notification: Performance of NFInst.instantiate(ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort): time 0.614/0.7646, allocations: 201.8 MB / 0.6236 GB, free: 10.15 MB / 494.1 MB Notification: Performance of NFInst.instExpressions: time 0.4066/1.171, allocations: 10.26 MB / 0.6336 GB, free: 4.23 MB / 494.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.001571/1.173, allocations: 31.16 kB / 0.6337 GB, free: 4.23 MB / 494.1 MB Notification: Performance of NFTyping.typeComponents: time 0.001414/1.174, allocations: 341.3 kB / 0.634 GB, free: 4.23 MB / 494.1 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:734:36-735:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:732:36-733:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:734:36-735:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:732:36-733:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:734:36-735:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:732:36-733:54:writable] Warning: 'each' used when modifying non-array element m_flow. Notification: Performance of NFTyping.typeBindings: time 0.009508/1.184, allocations: 2.484 MB / 0.6364 GB, free: 4.203 MB / 494.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.01243/1.196, allocations: 3.594 MB / 0.6399 GB, free: 4.156 MB / 494.1 MB Notification: Performance of NFFlatten.flatten: time 0.004945/1.201, allocations: 3.185 MB / 0.643 GB, free: 4.152 MB / 494.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.001407/1.203, allocations: 0.5907 MB / 0.6436 GB, free: 4.098 MB / 494.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.002696/1.205, allocations: 0.915 MB / 0.6445 GB, free: 4.098 MB / 494.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.002821/1.208, allocations: 1.122 MB / 0.6456 GB, free: 4.094 MB / 494.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0002476/1.209, allocations: 50.78 kB / 0.6456 GB, free: 4.094 MB / 494.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.01804/1.227, allocations: 7.113 MB / 0.6526 GB, free: 4.043 MB / 494.1 MB Notification: Performance of NFScalarize.scalarize: time 0.00168/1.228, allocations: 419.3 kB / 0.653 GB, free: 4.039 MB / 494.1 MB Notification: Performance of NFVerifyModel.verify: time 0.001315/1.23, allocations: 229.2 kB / 0.6532 GB, free: 20.01 MB / 0.4981 GB Notification: Performance of NFConvertDAE.convert: time 0.01408/1.244, allocations: 3.756 MB / 0.6569 GB, free: 19.73 MB / 0.4981 GB Notification: Performance of FrontEnd - DAE generated: time 6.703e-06/1.244, allocations: 0.75 kB / 0.6569 GB, free: 19.73 MB / 0.4981 GB Notification: Performance of FrontEnd: time 1.854e-06/1.244, allocations: 0 / 0.6569 GB, free: 19.73 MB / 0.4981 GB Notification: Performance of Transformations before backend: time 3.995e-05/1.244, allocations: 0.8438 kB / 0.6569 GB, free: 19.73 MB / 0.4981 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 196 * Number of variables: 196 Notification: Performance of Generate backend data structure: time 0.008649/1.252, allocations: 2.066 MB / 0.6589 GB, free: 18.59 MB / 0.4981 GB Notification: Performance of prepare preOptimizeDAE: time 4.881e-05/1.253, allocations: 9.031 kB / 0.6589 GB, free: 18.59 MB / 0.4981 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0006792/1.253, allocations: 120.7 kB / 0.659 GB, free: 18.54 MB / 0.4981 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.00175/1.255, allocations: 0.6874 MB / 0.6597 GB, free: 18.27 MB / 0.4981 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001043/1.255, allocations: 56.5 kB / 0.6597 GB, free: 18.27 MB / 0.4981 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001658/1.255, allocations: 68.94 kB / 0.6598 GB, free: 18.27 MB / 0.4981 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00305/1.258, allocations: 1.263 MB / 0.661 GB, free: 18.18 MB / 0.4981 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.162e-05/1.258, allocations: 0 / 0.661 GB, free: 18.18 MB / 0.4981 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001225/1.259, allocations: 34.05 kB / 0.6611 GB, free: 18.18 MB / 0.4981 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.000167/1.259, allocations: 73.45 kB / 0.6611 GB, free: 18.18 MB / 0.4981 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003003/1.262, allocations: 1.414 MB / 0.6625 GB, free: 18.17 MB / 0.4981 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.009992/1.272, allocations: 4.772 MB / 0.6672 GB, free: 16.3 MB / 0.4981 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001874/1.274, allocations: 0.8755 MB / 0.668 GB, free: 16.26 MB / 0.4981 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0006993/1.274, allocations: 417.9 kB / 0.6684 GB, free: 16.25 MB / 0.4981 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001684/1.276, allocations: 1.402 MB / 0.6698 GB, free: 14.93 MB / 0.4981 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.788e-05/1.276, allocations: 39.78 kB / 0.6698 GB, free: 14.89 MB / 0.4981 GB Notification: Performance of pre-optimization done (n=55): time 3.406e-06/1.276, allocations: 1.75 kB / 0.6698 GB, free: 14.89 MB / 0.4981 GB Notification: Performance of matching and sorting (n=55): time 0.002746/1.279, allocations: 1.276 MB / 0.6711 GB, free: 14.61 MB / 0.4981 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.765e-05/1.279, allocations: 109.1 kB / 0.6712 GB, free: 14.48 MB / 0.4981 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001538/1.281, allocations: 0.961 MB / 0.6721 GB, free: 14.2 MB / 0.4981 GB Notification: Performance of collectPreVariables (initialization): time 0.0001294/1.281, allocations: 40.92 kB / 0.6722 GB, free: 14.17 MB / 0.4981 GB Notification: Performance of collectInitialEqns (initialization): time 0.0003089/1.281, allocations: 450.1 kB / 0.6726 GB, free: 13.93 MB / 0.4981 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001668/1.281, allocations: 197.1 kB / 0.6728 GB, free: 13.79 MB / 0.4981 GB Notification: Performance of simplifyInitialFunctions (initialization): time 5.924e-05/1.281, allocations: 21.88 kB / 0.6728 GB, free: 13.78 MB / 0.4981 GB Notification: Performance of setup shared object (initialization): time 0.0001569/1.281, allocations: 336.8 kB / 0.6731 GB, free: 13.46 MB / 0.4981 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0007199/1.282, allocations: 469.9 kB / 0.6736 GB, free: 13.39 MB / 0.4981 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0007879/1.283, allocations: 0.6006 MB / 0.6742 GB, free: 13.18 MB / 0.4981 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0008598/1.284, allocations: 0.5392 MB / 0.6747 GB, free: 13.1 MB / 0.4981 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.871e-06/1.284, allocations: 6.141 kB / 0.6747 GB, free: 13.1 MB / 0.4981 GB Notification: Performance of matching and sorting (n=101) (initialization): time 0.002048/1.286, allocations: 1.268 MB / 0.6759 GB, free: 12.86 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001082/1.286, allocations: 181.4 kB / 0.6761 GB, free: 12.66 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.1e-05/1.286, allocations: 3.375 kB / 0.6761 GB, free: 12.66 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.021e-05/1.286, allocations: 9.469 kB / 0.6761 GB, free: 12.66 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008753/1.287, allocations: 215.9 kB / 0.6763 GB, free: 12.62 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.39e-05/1.287, allocations: 5.688 kB / 0.6763 GB, free: 12.62 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001048/1.288, allocations: 129.1 kB / 0.6765 GB, free: 12.55 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001153/1.288, allocations: 60.97 kB / 0.6765 GB, free: 12.55 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 7.814e-06/1.288, allocations: 7.312 kB / 0.6765 GB, free: 12.54 MB / 0.4981 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001767/1.29, allocations: 1.131 MB / 0.6776 GB, free: 12.36 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.883e-06/1.29, allocations: 8.203 kB / 0.6776 GB, free: 12.36 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.046e-05/1.29, allocations: 6.406 kB / 0.6776 GB, free: 12.36 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007856/1.291, allocations: 206.6 kB / 0.6778 GB, free: 12.32 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 9.488e-06/1.291, allocations: 7.984 kB / 0.6778 GB, free: 12.32 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.000806/1.292, allocations: 118.2 kB / 0.678 GB, free: 12.26 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001036/1.292, allocations: 62.41 kB / 0.678 GB, free: 12.25 MB / 0.4981 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 13 * 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 (101): * Single equations (assignments): 101 * 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: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.00065/1.292, allocations: 358.6 kB / 0.6784 GB, free: 12.04 MB / 0.4981 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001586/1.292, allocations: 94.31 kB / 0.6785 GB, free: 12 MB / 0.4981 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.002323/1.295, allocations: 1.296 MB / 0.6797 GB, free: 11.62 MB / 0.4981 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.087e-06/1.295, allocations: 10.67 kB / 0.6797 GB, free: 11.62 MB / 0.4981 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.664e-06/1.295, allocations: 0 / 0.6797 GB, free: 11.62 MB / 0.4981 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 7.303e-06/1.295, allocations: 3.984 kB / 0.6797 GB, free: 11.61 MB / 0.4981 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003101/1.298, allocations: 2.049 MB / 0.6817 GB, free: 10.81 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.011e-06/1.298, allocations: 8.656 kB / 0.6817 GB, free: 10.81 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0005564/1.299, allocations: 135 kB / 0.6819 GB, free: 10.79 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.141e-05/1.299, allocations: 9.156 kB / 0.6819 GB, free: 10.79 MB / 0.4981 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.6e-05/1.299, allocations: 18.5 kB / 0.6819 GB, free: 10.79 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 1.062e-05/1.299, allocations: 10.64 kB / 0.6819 GB, free: 10.79 MB / 0.4981 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.218e-06/1.299, allocations: 2.438 kB / 0.6819 GB, free: 10.79 MB / 0.4981 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001599/1.3, allocations: 1.09 MB / 0.683 GB, free: 10.39 MB / 0.4981 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004075/1.301, allocations: 212 kB / 0.6832 GB, free: 10.22 MB / 0.4981 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001562/1.301, allocations: 14.91 kB / 0.6832 GB, free: 10.22 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006965/1.302, allocations: 54.28 kB / 0.6832 GB, free: 10.2 MB / 0.4981 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001239/1.302, allocations: 58.17 kB / 0.6833 GB, free: 10.18 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001204/1.302, allocations: 51.34 kB / 0.6833 GB, free: 10.18 MB / 0.4981 GB Notification: Performance of sorting global known variables: time 0.00095/1.303, allocations: 0.6935 MB / 0.684 GB, free: 9.977 MB / 0.4981 GB Notification: Performance of sort global known variables: time 1.5e-07/1.303, allocations: 0 / 0.684 GB, free: 9.977 MB / 0.4981 GB Notification: Performance of remove unused functions: time 0.004265/1.307, allocations: 1.188 MB / 0.6852 GB, free: 9.746 MB / 0.4981 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 9 * 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 simulation (64): * Single equations (assignments): 64 * 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: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.003882/1.311, allocations: 1.176 MB / 0.6863 GB, free: 9.285 MB / 0.4981 GB Notification: Performance of simCode: created initialization part: time 0.003034/1.314, allocations: 1.606 MB / 0.6879 GB, free: 9.027 MB / 0.4981 GB Notification: Performance of simCode: created event and clocks part: time 1.089e-05/1.314, allocations: 2.156 kB / 0.6879 GB, free: 9.027 MB / 0.4981 GB Notification: Performance of simCode: created simulation system equations: time 0.0006976/1.315, allocations: 460.6 kB / 0.6883 GB, free: 8.961 MB / 0.4981 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002662/1.317, allocations: 0.5045 MB / 0.6888 GB, free: 8.801 MB / 0.4981 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002936/1.32, allocations: 2.018 MB / 0.6908 GB, free: 7.719 MB / 0.4981 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006077/1.321, allocations: 1.057 MB / 0.6918 GB, free: 6.875 MB / 0.4981 GB Notification: Performance of simCode: alias equations: time 0.002102/1.323, allocations: 0.5634 MB / 0.6924 GB, free: 6.633 MB / 0.4981 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003969/1.323, allocations: 115.3 kB / 0.6925 GB, free: 6.617 MB / 0.4981 GB Notification: Performance of SimCode: time 2.725e-06/1.323, allocations: 6.031 kB / 0.6925 GB, free: 6.613 MB / 0.4981 GB Notification: Performance of Templates: time 0.06011/1.384, allocations: 35.17 MB / 0.7268 GB, free: 4.621 MB / 0.5294 GB make -j1 -f ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.makefile Environment - environmentSimulation: (rm -f ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.pipe ; mkfifo ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.pipe ; head -c 1048576 < ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.pipe >> ../files/ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.sim & ./ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort -abortSlowSimulation -alarm=480 -lv LOG_STATS > ModelicaTest_3.2.2_ModelicaTest.Fluid.TestComponents.Fittings.TestMultiPort.pipe 2>&1) Environment - environmentSimulation: