Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.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 8.1.4-maint.8.1.x/package.mo", uses=false) Using package Buildings with version 8.1.4 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.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: "" <> buildModelFMU(Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust,fileNamePrefix="Buildings_8_Buildings_Fluid_FMI_Adaptors_Examples_ThermalZoneHVACWithExhaust",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust,fileNamePrefix="Buildings_8_Buildings_Fluid_FMI_Adaptors_Examples_ThermalZoneHVACWithExhaust",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 0.0009111/0.000911, allocations: 91.61 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 0.001374/0.001373, 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 1.707/1.707, 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/Buildings 8.1.4-maint.8.1.x/package.mo): time 1.73/1.73, allocations: 292.7 MB / 0.5499 GB, free: 14.52 MB / 462.1 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 0.0005376/0.0005376, allocations: 18.09 kB / 0.6738 GB, free: 26.12 MB / 0.5294 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2749/0.2755, allocations: 116.3 MB / 0.7874 GB, free: 11.8 MB / 0.6075 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust): time 0.9487/1.224, allocations: 347.2 MB / 1.126 GB, free: 0.4961 MB / 0.8262 GB Notification: Performance of NFInst.instExpressions: time 0.06406/1.288, allocations: 43.94 MB / 1.169 GB, free: 4.473 MB / 0.8731 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.009452/1.298, allocations: 143.1 kB / 1.169 GB, free: 4.332 MB / 0.8731 GB Notification: Performance of NFTyping.typeComponents: time 0.009649/1.307, allocations: 1.789 MB / 1.171 GB, free: 2.531 MB / 0.8731 GB Notification: Performance of NFTyping.typeBindings: time 0.02044/1.328, allocations: 5.27 MB / 1.176 GB, free: 13.24 MB / 0.8887 GB Notification: Performance of NFTyping.typeClassSections: time 0.008954/1.337, allocations: 2.778 MB / 1.179 GB, free: 10.49 MB / 0.8887 GB Notification: Performance of NFFlatten.flatten: time 0.01761/1.355, allocations: 13.04 MB / 1.192 GB, free: 13.42 MB / 0.9044 GB Notification: Performance of NFFlatten.resolveConnections: time 0.00859/1.363, allocations: 3.934 MB / 1.196 GB, free: 9.434 MB / 0.9044 GB Notification: Performance of NFEvalConstants.evaluate: time 0.01542/1.379, allocations: 4.847 MB / 1.2 GB, free: 4.566 MB / 0.9044 GB Notification: Performance of NFSimplifyModel.simplify: time 0.007241/1.386, allocations: 3.279 MB / 1.204 GB, free: 1.273 MB / 0.9044 GB Notification: Performance of NFPackage.collectConstants: time 0.001313/1.387, allocations: 168 kB / 1.204 GB, free: 1.109 MB / 0.9044 GB Notification: Performance of NFFlatten.collectFunctions: time 0.01057/1.398, allocations: 3.352 MB / 1.207 GB, free: 13.75 MB / 0.92 GB Notification: Performance of NFScalarize.scalarize: time 0.002369/1.4, allocations: 1.339 MB / 1.208 GB, free: 12.41 MB / 0.92 GB Notification: Performance of NFVerifyModel.verify: time 0.002049/1.402, allocations: 0.9953 MB / 1.209 GB, free: 11.4 MB / 0.92 GB Notification: Performance of NFConvertDAE.convert: time 0.009744/1.412, allocations: 6.613 MB / 1.216 GB, free: 4.773 MB / 0.92 GB Notification: Performance of FrontEnd - DAE generated: time 6.732e-06/1.412, allocations: 0 / 1.216 GB, free: 4.773 MB / 0.92 GB Notification: Performance of FrontEnd: time 2.575e-06/1.412, allocations: 0 / 1.216 GB, free: 4.773 MB / 0.92 GB Notification: Performance of Transformations before backend: time 0.0001917/1.412, allocations: 0 / 1.216 GB, free: 4.773 MB / 0.92 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 856 * Number of variables: 856 Notification: Performance of Generate backend data structure: time 0.01014/1.422, allocations: 4.759 MB / 1.22 GB, free: 15.92 MB / 0.9356 GB Notification: Performance of prepare preOptimizeDAE: time 4.386e-05/1.423, allocations: 8.031 kB / 1.22 GB, free: 15.91 MB / 0.9356 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.00106/1.424, allocations: 471.9 kB / 1.221 GB, free: 15.44 MB / 0.9356 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01011/1.434, allocations: 1.914 MB / 1.223 GB, free: 13.52 MB / 0.9356 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.009022/1.443, allocations: 3.386 MB / 1.226 GB, free: 10.08 MB / 0.9356 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.001673/1.445, allocations: 0.697 MB / 1.227 GB, free: 9.355 MB / 0.9356 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.001138/1.446, allocations: 348 kB / 1.227 GB, free: 9.016 MB / 0.9356 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.01055/1.456, allocations: 4.593 MB / 1.232 GB, free: 4.324 MB / 0.9356 GB Notification: Performance of preOpt findStateOrder (simulation): time 6.83e-05/1.456, allocations: 8 kB / 1.232 GB, free: 4.316 MB / 0.9356 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0003861/1.457, allocations: 140 kB / 1.232 GB, free: 4.18 MB / 0.9356 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.000137/1.457, allocations: 146.4 kB / 1.232 GB, free: 4.035 MB / 0.9356 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01012/1.467, allocations: 4.183 MB / 1.236 GB, free: 15.84 MB / 0.9512 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 0.03403/1.501, allocations: 18.79 MB / 1.254 GB, free: 11.72 MB / 0.9669 GB Notification: Performance of preOpt comSubExp (simulation): time 0.004558/1.506, allocations: 2.072 MB / 1.256 GB, free: 9.609 MB / 0.9669 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.002624/1.508, allocations: 1.093 MB / 1.257 GB, free: 8.512 MB / 0.9669 GB Notification: Performance of preOpt evalFunc (simulation): time 0.000785/1.509, allocations: 437.6 kB / 1.258 GB, free: 8.008 MB / 0.9669 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.002864/1.512, allocations: 1.272 MB / 1.259 GB, free: 6.711 MB / 0.9669 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.002107/1.514, allocations: 185.9 kB / 1.259 GB, free: 6.527 MB / 0.9669 GB Notification: Performance of pre-optimization done (n=135): time 3.917e-06/1.514, allocations: 0 / 1.259 GB, free: 6.527 MB / 0.9669 GB Notification: Performance of matching and sorting (n=135): time 0.008369/1.523, allocations: 3.307 MB / 1.262 GB, free: 3.191 MB / 0.9669 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001141/1.523, allocations: 149.8 kB / 1.263 GB, free: 3.012 MB / 0.9669 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.006391/1.529, allocations: 3.65 MB / 1.266 GB, free: 15.34 MB / 0.9825 GB Notification: Performance of collectPreVariables (initialization): time 0.0004617/1.53, allocations: 61.7 kB / 1.266 GB, free: 15.27 MB / 0.9825 GB Notification: Performance of collectInitialEqns (initialization): time 0.002218/1.532, allocations: 2.005 MB / 1.268 GB, free: 13.25 MB / 0.9825 GB Notification: Performance of collectInitialBindings (initialization): time 0.0007743/1.533, allocations: 473.2 kB / 1.269 GB, free: 12.78 MB / 0.9825 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001409/1.533, allocations: 36 kB / 1.269 GB, free: 12.75 MB / 0.9825 GB Notification: Performance of setup shared object (initialization): time 0.0002041/1.533, allocations: 373.9 kB / 1.269 GB, free: 12.38 MB / 0.9825 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.002896/1.536, allocations: 1.148 MB / 1.27 GB, free: 11.23 MB / 0.9825 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.003384/1.539, allocations: 1.838 MB / 1.272 GB, free: 9.094 MB / 0.9825 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.003085/1.542, allocations: 1.304 MB / 1.273 GB, free: 7.781 MB / 0.9825 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.31e-05/1.542, allocations: 8 kB / 1.273 GB, free: 7.773 MB / 0.9825 GB Notification: Performance of matching and sorting (n=234) (initialization): time 0.007862/1.55, allocations: 3.255 MB / 1.276 GB, free: 4.5 MB / 0.9825 GB Notification: Performance of prepare postOptimizeDAE: time 0.0004587/1.551, allocations: 0.608 MB / 1.277 GB, free: 3.668 MB / 0.9825 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.616e-05/1.551, allocations: 16 kB / 1.277 GB, free: 3.652 MB / 0.9825 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.797e-05/1.551, allocations: 28 kB / 1.277 GB, free: 3.625 MB / 0.9825 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002566/1.553, allocations: 0.5812 MB / 1.278 GB, free: 3.043 MB / 0.9825 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 3.704e-05/1.554, allocations: 31.88 kB / 1.278 GB, free: 3.012 MB / 0.9825 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.004792/1.558, allocations: 0.6203 MB / 1.278 GB, free: 2.391 MB / 0.9825 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002358/1.559, allocations: 95.97 kB / 1.278 GB, free: 2.297 MB / 0.9825 GB Notification: Performance of prepare postOptimizeDAE: time 1.457e-05/1.559, allocations: 4 kB / 1.278 GB, free: 2.293 MB / 0.9825 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.6398/2.198, allocations: 2.909 MB / 1.281 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.352e-05/2.199, allocations: 16.66 kB / 1.281 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt tearingSystem (initialization): time 4.601e-05/2.199, allocations: 27.28 kB / 1.281 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.003034/2.202, allocations: 0.5757 MB / 1.282 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 6.203e-05/2.202, allocations: 35.92 kB / 1.282 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.005415/2.207, allocations: 0.5406 MB / 1.282 GB, free: 374.1 MB / 0.9825 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0003816/2.208, allocations: 90.05 kB / 1.282 GB, free: 374.1 MB / 0.9825 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 72 * Number of states: 0 () * Number of discrete variables: 6 ($whenCondition1,$PRE.TSet.T_start,TSet.T_start,$PRE.TSet.count,TSet.count,conPI.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (230): * Single equations (assignments): 226 * Array equations: 3 * Algorithm blocks: 1 * 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 0.003315/2.211, allocations: 1.124 MB / 1.283 GB, free: 374 MB / 0.9825 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001208/2.212, allocations: 367.1 kB / 1.284 GB, free: 374 MB / 0.9825 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.006789/2.219, allocations: 2.621 MB / 1.286 GB, free: 373.8 MB / 0.9825 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.555e-05/2.219, allocations: 15.34 kB / 1.286 GB, free: 373.8 MB / 0.9825 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.071e-05/2.219, allocations: 0 / 1.286 GB, free: 373.8 MB / 0.9825 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.004172/2.223, allocations: 2.211 MB / 1.289 GB, free: 373.3 MB / 0.9825 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 postOpt removeSimpleEquations (simulation): time 0.01744/2.241, allocations: 7.107 MB / 1.296 GB, free: 370.8 MB / 0.9825 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.219e-05/2.241, allocations: 8.219 kB / 1.296 GB, free: 370.8 MB / 0.9825 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002124/2.243, allocations: 369.8 kB / 1.296 GB, free: 370.8 MB / 0.9825 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0002903/2.243, allocations: 57.94 kB / 1.296 GB, free: 370.8 MB / 0.9825 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001581/2.243, allocations: 47.11 kB / 1.296 GB, free: 370.8 MB / 0.9825 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001285/2.245, allocations: 1.44 MB / 1.297 GB, free: 369.4 MB / 0.9825 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.534e-05/2.245, allocations: 13.97 kB / 1.297 GB, free: 369.4 MB / 0.9825 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01052/2.255, allocations: 3.874 MB / 1.301 GB, free: 367.9 MB / 0.9825 GB Notification: Performance of postOpt removeConstants (simulation): time 0.002575/2.258, allocations: 0.6818 MB / 1.302 GB, free: 367.4 MB / 0.9825 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0009907/2.259, allocations: 43.28 kB / 1.302 GB, free: 367.4 MB / 0.9825 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.003617/2.262, allocations: 433.6 kB / 1.302 GB, free: 367.4 MB / 0.9825 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0003303/2.263, allocations: 120.5 kB / 1.302 GB, free: 367.3 MB / 0.9825 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0002214/2.263, allocations: 68.61 kB / 1.302 GB, free: 367.3 MB / 0.9825 GB Notification: Performance of sorting global known variables: time 0.00583/2.269, allocations: 2.523 MB / 1.305 GB, free: 366.4 MB / 0.9825 GB Notification: Performance of sort global known variables: time 5.41e-07/2.269, allocations: 0 / 1.305 GB, free: 366.4 MB / 0.9825 GB Notification: Performance of remove unused functions: time 0.0102/2.279, allocations: 2.009 MB / 1.307 GB, free: 366.2 MB / 0.9825 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 38 * Number of states: 4 (conPI.I.y,vol.dynBal.U,vol.dynBal.m,vol.dynBal.mXi[1]) * Number of discrete variables: 3 ($whenCondition1,TSet.T_start,TSet.count) * Number of discrete states: 1 (TSet.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (133): * Single equations (assignments): 130 * 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: 1 {(1,100.0%) 2} * Non-linear torn systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.01081/2.29, allocations: 4.83 MB / 1.312 GB, free: 363.9 MB / 0.9825 GB Notification: Performance of simCode: created initialization part: time 0.01013/2.3, allocations: 4.058 MB / 1.316 GB, free: 362.8 MB / 0.9825 GB Notification: Performance of simCode: created event and clocks part: time 2.184e-05/2.3, allocations: 0 / 1.316 GB, free: 362.8 MB / 0.9825 GB Notification: Performance of simCode: created simulation system equations: time 0.002839/2.303, allocations: 1.208 MB / 1.317 GB, free: 362.3 MB / 0.9825 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.01048/2.313, allocations: 1.926 MB / 1.319 GB, free: 361.9 MB / 0.9825 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.06431/2.378, allocations: 28.52 MB / 1.346 GB, free: 339.1 MB / 0.9825 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002092/2.38, allocations: 2.661 MB / 1.349 GB, free: 336.4 MB / 0.9825 GB Notification: Performance of simCode: alias equations: time 0.005267/2.385, allocations: 0.9759 MB / 1.35 GB, free: 335.5 MB / 0.9825 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.002471/2.388, allocations: 1.741 MB / 1.352 GB, free: 333.7 MB / 0.9825 GB Notification: Performance of SimCode: time 2.224e-06/2.388, allocations: 0 / 1.352 GB, free: 333.7 MB / 0.9825 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.1722/2.56, allocations: 104.2 MB / 1.453 GB, free: 230.7 MB / 0.9825 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001686/2.56, allocations: 252 kB / 1.454 GB, free: 230.3 MB / 0.9825 GB Notification: Performance of buildModelFMU: Generate platform static: time 5.515/8.075, allocations: 3.375 kB / 1.454 GB, free: 230.3 MB / 0.9825 GB (rm -f Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.pipe ; mkfifo Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.pipe ; head -c 1048576 < Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.pipe >> ../files/Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_Buildings_8_Buildings_Fluid_FMI_Adaptors_Examples_ThermalZoneHVACWithExhaust_fmu --startTime=0 --stopTime=172800 --timeout=50 --tolerance=1e-06 Buildings_8_Buildings_Fluid_FMI_Adaptors_Examples_ThermalZoneHVACWithExhaust.fmu > Buildings_8_Buildings.Fluid.FMI.Adaptors.Examples.ThermalZoneHVACWithExhaust.pipe 2>&1) Environment - environmentSimulation: