Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.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 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.5.0-master/package.mo", uses=false) Using package BuildSysPro with version 3.5.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.5.0-master/package.mo) Using package Modelica with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+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(BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir,fileNamePrefix="BuildSysPro_BuildSysPro_IBPSA_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir,fileNamePrefix="BuildSysPro_BuildSysPro_IBPSA_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir",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 0.001031/0.001032, allocations: 92.23 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 0.001209/0.001209, 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 4.0.0+maint.om/package.mo): time 1.498/1.498, allocations: 223.3 MB / 240 MB, free: 5.398 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.5.0-master/package.mo): time 1.058/1.058, allocations: 143.4 MB / 434.4 MB, free: 13.69 MB / 350.1 MB Notification: Performance of FrontEnd - loaded program: time 0.0004415/0.000442, allocations: 8 kB / 0.5161 GB, free: 11.22 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2386/0.2391, allocations: 83.42 MB / 0.5975 GB, free: 7.746 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir): time 0.5527/0.7918, allocations: 181 MB / 0.7743 GB, free: 7.141 MB / 0.5919 GB Notification: Performance of NFInst.instExpressions: time 0.01312/0.805, allocations: 9.686 MB / 0.7837 GB, free: 13.43 MB / 0.6075 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001782/0.8068, allocations: 55.69 kB / 0.7838 GB, free: 13.37 MB / 0.6075 GB Notification: Performance of NFTyping.typeComponents: time 0.001311/0.8081, allocations: 401.1 kB / 0.7842 GB, free: 12.98 MB / 0.6075 GB Notification: Performance of NFTyping.typeBindings: time 0.004347/0.8125, allocations: 1.45 MB / 0.7856 GB, free: 11.52 MB / 0.6075 GB Notification: Performance of NFTyping.typeClassSections: time 0.003016/0.8155, allocations: 1.045 MB / 0.7866 GB, free: 10.48 MB / 0.6075 GB Notification: Performance of NFFlatten.flatten: time 0.003652/0.8192, allocations: 3.128 MB / 0.7897 GB, free: 7.352 MB / 0.6075 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001426/0.8206, allocations: 0.8752 MB / 0.7905 GB, free: 6.453 MB / 0.6075 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003257/0.8239, allocations: 1.311 MB / 0.7918 GB, free: 5.137 MB / 0.6075 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001833/0.8257, allocations: 0.8674 MB / 0.7926 GB, free: 4.266 MB / 0.6075 GB Notification: Performance of NFPackage.collectConstants: time 0.0002372/0.826, allocations: 51.94 kB / 0.7927 GB, free: 4.215 MB / 0.6075 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003381/0.8294, allocations: 1.318 MB / 0.794 GB, free: 2.895 MB / 0.6075 GB Notification: Performance of NFScalarize.scalarize: time 0.0005303/0.8299, allocations: 338.8 kB / 0.7943 GB, free: 2.562 MB / 0.6075 GB Notification: Performance of NFVerifyModel.verify: time 0.0005076/0.8304, allocations: 273 kB / 0.7946 GB, free: 2.289 MB / 0.6075 GB Notification: Performance of NFConvertDAE.convert: time 0.002816/0.8333, allocations: 1.742 MB / 0.7963 GB, free: 0.543 MB / 0.6075 GB Notification: Performance of FrontEnd - DAE generated: time 4.929e-06/0.8333, allocations: 0 / 0.7963 GB, free: 0.543 MB / 0.6075 GB Notification: Performance of FrontEnd: time 1.502e-06/0.8333, allocations: 0 / 0.7963 GB, free: 0.543 MB / 0.6075 GB Notification: Performance of Transformations before backend: time 8.223e-05/0.8334, allocations: 0 / 0.7963 GB, free: 0.543 MB / 0.6075 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 253 * Number of variables: 253 Notification: Performance of Generate backend data structure: time 0.00337/0.8368, allocations: 1.585 MB / 0.7978 GB, free: 14.91 MB / 0.6231 GB Notification: Performance of prepare preOptimizeDAE: time 4.211e-05/0.8368, allocations: 8.031 kB / 0.7978 GB, free: 14.9 MB / 0.6231 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002989/0.8371, allocations: 152.8 kB / 0.798 GB, free: 14.75 MB / 0.6231 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002202/0.8393, allocations: 373.8 kB / 0.7983 GB, free: 14.38 MB / 0.6231 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001733/0.8411, allocations: 0.8785 MB / 0.7992 GB, free: 13.46 MB / 0.6231 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.997e-05/0.8411, allocations: 82 kB / 0.7993 GB, free: 13.38 MB / 0.6231 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001354/0.8413, allocations: 111.9 kB / 0.7994 GB, free: 13.27 MB / 0.6231 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001661/0.843, allocations: 1.096 MB / 0.8004 GB, free: 12.11 MB / 0.6231 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.455e-05/0.843, allocations: 0 / 0.8004 GB, free: 12.11 MB / 0.6231 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.201e-05/0.8431, allocations: 48 kB / 0.8005 GB, free: 12.07 MB / 0.6231 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.681e-05/0.8431, allocations: 34 kB / 0.8005 GB, free: 12.03 MB / 0.6231 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001371/0.8445, allocations: 0.804 MB / 0.8013 GB, free: 11.23 MB / 0.6231 GB 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 0.005653/0.8502, allocations: 5.07 MB / 0.8063 GB, free: 5.805 MB / 0.6231 GB Notification: Performance of preOpt comSubExp (simulation): time 0.00115/0.8513, allocations: 0.7096 MB / 0.8069 GB, free: 5.094 MB / 0.6231 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0005297/0.8519, allocations: 354.4 kB / 0.8073 GB, free: 4.746 MB / 0.6231 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0005749/0.8525, allocations: 323.9 kB / 0.8076 GB, free: 4.375 MB / 0.6231 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.352e-05/0.8525, allocations: 43.12 kB / 0.8076 GB, free: 4.32 MB / 0.6231 GB Notification: Performance of pre-optimization done (n=70): time 2.675e-06/0.8525, allocations: 0 / 0.8076 GB, free: 4.32 MB / 0.6231 GB Notification: Performance of matching and sorting (n=70): time 0.001916/0.8545, allocations: 0.931 MB / 0.8085 GB, free: 3.387 MB / 0.6231 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.584e-05/0.8545, allocations: 59.97 kB / 0.8086 GB, free: 3.316 MB / 0.6231 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001163/0.8557, allocations: 0.8687 MB / 0.8095 GB, free: 2.43 MB / 0.6231 GB Notification: Performance of collectPreVariables (initialization): time 7.267e-05/0.8558, allocations: 41.7 kB / 0.8095 GB, free: 2.383 MB / 0.6231 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004242/0.8562, allocations: 0.5622 MB / 0.81 GB, free: 1.812 MB / 0.6231 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002235/0.8564, allocations: 252.4 kB / 0.8103 GB, free: 1.562 MB / 0.6231 GB Notification: Performance of simplifyInitialFunctions (initialization): time 4.079e-05/0.8565, allocations: 16 kB / 0.8103 GB, free: 1.547 MB / 0.6231 GB Notification: Performance of setup shared object (initialization): time 0.0001374/0.8566, allocations: 330 kB / 0.8106 GB, free: 1.219 MB / 0.6231 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.000477/0.8571, allocations: 249.9 kB / 0.8108 GB, free: 0.9727 MB / 0.6231 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0005834/0.8577, allocations: 444.7 kB / 0.8113 GB, free: 476 kB / 0.6231 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.000549/0.8583, allocations: 311.1 kB / 0.8116 GB, free: 164 kB / 0.6231 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.216e-06/0.8583, allocations: 11.89 kB / 0.8116 GB, free: 152 kB / 0.6231 GB Notification: Performance of matching and sorting (n=94) (initialization): time 0.001432/0.8597, allocations: 0.832 MB / 0.8124 GB, free: 15.3 MB / 0.6387 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001513/0.8599, allocations: 233.1 kB / 0.8126 GB, free: 15.01 MB / 0.6387 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.304e-05/0.8599, allocations: 4.5 kB / 0.8126 GB, free: 15.01 MB / 0.6387 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.637e-05/0.8599, allocations: 8 kB / 0.8126 GB, free: 15 MB / 0.6387 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001421/0.8614, allocations: 251.6 kB / 0.8129 GB, free: 14.75 MB / 0.6387 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001351/0.8627, allocations: 1.393 MB / 0.8142 GB, free: 13.23 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0008302/0.8636, allocations: 119.2 kB / 0.8143 GB, free: 13.11 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.868e-05/0.8637, allocations: 32 kB / 0.8144 GB, free: 13.08 MB / 0.6387 GB Notification: Performance of prepare postOptimizeDAE: time 9.749e-06/0.8637, allocations: 8.578 kB / 0.8144 GB, free: 13.07 MB / 0.6387 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001156/0.8648, allocations: 0.7022 MB / 0.8151 GB, free: 12.37 MB / 0.6387 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.764e-06/0.8649, allocations: 4.625 kB / 0.8151 GB, free: 12.37 MB / 0.6387 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.069e-05/0.8649, allocations: 19.94 kB / 0.8151 GB, free: 12.35 MB / 0.6387 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001317/0.8662, allocations: 251.7 kB / 0.8153 GB, free: 12.1 MB / 0.6387 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001131/0.8673, allocations: 1.387 MB / 0.8167 GB, free: 10.58 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0008359/0.8682, allocations: 117.1 kB / 0.8168 GB, free: 10.46 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.937e-05/0.8683, allocations: 39.98 kB / 0.8168 GB, free: 10.43 MB / 0.6387 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 21 * Number of states: 0 () * Number of discrete variables: 4 (PI1.I.trigger_internal,PI.I.trigger_internal,QLat.local_reset,QSen.local_reset) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (94): * Single equations (assignments): 93 * 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: 0 * 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: Performance of prepare postOptimizeDAE: time 0.0005255/0.8688, allocations: 370.7 kB / 0.8172 GB, free: 10.05 MB / 0.6387 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001915/0.869, allocations: 114.5 kB / 0.8173 GB, free: 9.941 MB / 0.6387 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00159/0.8706, allocations: 0.7903 MB / 0.8181 GB, free: 9.145 MB / 0.6387 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 7.484e-06/0.8706, allocations: 8 kB / 0.8181 GB, free: 9.137 MB / 0.6387 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 2.425e-06/0.8706, allocations: 0 / 0.8181 GB, free: 9.137 MB / 0.6387 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001209/0.8718, allocations: 0.7078 MB / 0.8188 GB, free: 8.395 MB / 0.6387 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003122/0.875, allocations: 1.93 MB / 0.8207 GB, free: 6.391 MB / 0.6387 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.551e-06/0.875, allocations: 4 kB / 0.8207 GB, free: 6.387 MB / 0.6387 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0007016/0.8757, allocations: 139.8 kB / 0.8208 GB, free: 6.25 MB / 0.6387 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0003788/0.8761, allocations: 56.97 kB / 0.8208 GB, free: 6.191 MB / 0.6387 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.36e-05/0.8762, allocations: 16 kB / 0.8209 GB, free: 6.176 MB / 0.6387 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001128/0.8773, allocations: 1.344 MB / 0.8222 GB, free: 4.695 MB / 0.6387 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.535e-06/0.8773, allocations: 0 / 0.8222 GB, free: 4.695 MB / 0.6387 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001948/0.8793, allocations: 1.219 MB / 0.8234 GB, free: 3.43 MB / 0.6387 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004233/0.8797, allocations: 255.5 kB / 0.8236 GB, free: 3.16 MB / 0.6387 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001434/0.8798, allocations: 19.98 kB / 0.8236 GB, free: 3.141 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006487/0.8805, allocations: 59.8 kB / 0.8237 GB, free: 3.082 MB / 0.6387 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 9.223e-05/0.8806, allocations: 56.44 kB / 0.8237 GB, free: 3.027 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.627e-05/0.8807, allocations: 27.11 kB / 0.8238 GB, free: 3.004 MB / 0.6387 GB Notification: Performance of sorting global known variables: time 0.0007257/0.8814, allocations: 0.585 MB / 0.8243 GB, free: 2.41 MB / 0.6387 GB Notification: Performance of sort global known variables: time 1.6e-07/0.8814, allocations: 0 / 0.8243 GB, free: 2.41 MB / 0.6387 GB Notification: Performance of remove unused functions: time 0.001441/0.8828, allocations: 0.5336 MB / 0.8249 GB, free: 1.875 MB / 0.6387 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 7 (vol1.dynBal.medium.Xi[1],vol1.dynBal.U,vol1.dynBal.m,QSen.y,QLat.y,PI.I.y,PI1.I.y) * 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 (70): * Single equations (assignments): 69 * 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 1} Notification: Performance of Backend phase and start with SimCode phase: time 0.002632/0.8855, allocations: 1.882 MB / 0.8267 GB, free: 15.95 MB / 0.6544 GB Notification: Performance of simCode: created initialization part: time 0.003323/0.8888, allocations: 1.178 MB / 0.8278 GB, free: 14.77 MB / 0.6544 GB Notification: Performance of simCode: created event and clocks part: time 6.202e-06/0.8888, allocations: 4 kB / 0.8278 GB, free: 14.77 MB / 0.6544 GB Notification: Performance of simCode: created simulation system equations: time 0.000759/0.8896, allocations: 445.1 kB / 0.8283 GB, free: 14.32 MB / 0.6544 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002499/0.8921, allocations: 0.5087 MB / 0.8288 GB, free: 13.83 MB / 0.6544 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01164/0.9038, allocations: 6.624 MB / 0.8352 GB, free: 6.879 MB / 0.6544 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007991/0.9046, allocations: 1.144 MB / 0.8364 GB, free: 5.703 MB / 0.6544 GB Notification: Performance of simCode: alias equations: time 0.001161/0.9058, allocations: 274.9 kB / 0.8366 GB, free: 5.434 MB / 0.6544 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000596/0.9064, allocations: 463.3 kB / 0.8371 GB, free: 4.98 MB / 0.6544 GB Notification: Performance of SimCode: time 1.022e-06/0.9064, allocations: 0 / 0.8371 GB, free: 4.98 MB / 0.6544 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.4623/1.369, allocations: 26.81 MB / 0.8632 GB, free: 204.9 MB / 0.67 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001929/1.369, allocations: 274.9 kB / 0.8635 GB, free: 204.5 MB / 0.67 GB Notification: Performance of buildModelFMU: Generate platform static: time 2.432/3.801, allocations: 0 / 0.8635 GB, free: 204.5 MB / 0.67 GB (rm -f BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe ; mkfifo BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe ; head -c 1048576 < BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe >> ../files/BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_BuildSysPro_BuildSysPro_IBPSA_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir_fmu --startTime=0 --stopTime=600 --timeout=50 --tolerance=1e-06 BuildSysPro_BuildSysPro_IBPSA_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir.fmu > BuildSysPro_BuildSysPro.IBPSA.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe 2>&1) Environment - environmentSimulation: