Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.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 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.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir")
translateModel(Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir")
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0007929/0.0007969, allocations: 90.67 kB / 15.36 MB, free: 0.7383 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.006928/0.006928, allocations: 172.8 kB / 16.26 MB, free: 6.613 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.63/1.63, allocations: 205.4 MB / 222.4 MB, free: 5.555 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 1.574/1.574, allocations: 252 MB / 0.5105 GB, free: 4.633 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 0.0006117/0.0006118, allocations: 12 kB / 0.6249 GB, free: 0.707 MB / 0.5137 GB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.5919/0.5925, allocations: 106.3 MB / 0.7287 GB, free: 11.25 MB / 0.545 GB
Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir): time 0.8371/1.43, allocations: 194.2 MB / 0.9183 GB, free: 2.012 MB / 0.7169 GB
Notification: Performance of NFInst.instExpressions: time 0.01885/1.449, allocations: 10.37 MB / 0.9285 GB, free: 1.871 MB / 0.7169 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.002576/1.451, allocations: 49.94 kB / 0.9285 GB, free: 1.871 MB / 0.7169 GB
Notification: Performance of NFTyping.typeComponents: time 0.001693/1.453, allocations: 480.2 kB / 0.929 GB, free: 1.863 MB / 0.7169 GB
Notification: Performance of NFTyping.typeBindings: time 0.008801/1.462, allocations: 1.843 MB / 0.9308 GB, free: 1.773 MB / 0.7169 GB
Notification: Performance of NFTyping.typeClassSections: time 0.006268/1.468, allocations: 1.261 MB / 0.932 GB, free: 1.734 MB / 0.7169 GB
Notification: Performance of NFFlatten.flatten: time 0.007477/1.475, allocations: 3.725 MB / 0.9356 GB, free: 1.73 MB / 0.7169 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.002185/1.478, allocations: 1.004 MB / 0.9366 GB, free: 1.562 MB / 0.7169 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.005824/1.484, allocations: 1.481 MB / 0.9381 GB, free: 1.535 MB / 0.7169 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.002536/1.486, allocations: 0.9117 MB / 0.939 GB, free: 1.531 MB / 0.7169 GB
Notification: Performance of NFPackage.collectConstants: time 0.000432/1.487, allocations: 51.62 kB / 0.939 GB, free: 1.531 MB / 0.7169 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.00644/1.493, allocations: 2.381 MB / 0.9413 GB, free: 1.5 MB / 0.7169 GB
Notification: Performance of NFScalarize.scalarize: time 0.0009558/1.494, allocations: 350.9 kB / 0.9417 GB, free: 1.5 MB / 0.7169 GB
Notification: Performance of NFVerifyModel.verify: time 0.001495/1.496, allocations: 0.6451 MB / 0.9423 GB, free: 1.469 MB / 0.7169 GB
Notification: Performance of NFConvertDAE.convert: time 0.004542/1.5, allocations: 2.514 MB / 0.9448 GB, free: 1.309 MB / 0.7169 GB
Notification: Performance of FrontEnd - DAE generated: time 3.657e-06/1.5, allocations: 0 / 0.9448 GB, free: 1.309 MB / 0.7169 GB
Notification: Performance of FrontEnd: time 1.393e-06/1.5, allocations: 2.781 kB / 0.9448 GB, free: 1.309 MB / 0.7169 GB
Notification: Performance of Transformations before backend: time 2.322e-05/1.5, allocations: 0 / 0.9448 GB, free: 1.309 MB / 0.7169 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 255
 * Number of variables: 255
Notification: Performance of Generate backend data structure: time 0.002693/1.503, allocations: 1.568 MB / 0.9463 GB, free: 16.39 MB / 0.7325 GB
Notification: Performance of prepare preOptimizeDAE: time 4.702e-05/1.503, allocations: 8.531 kB / 0.9463 GB, free: 16.39 MB / 0.7325 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001991/1.505, allocations: 370.7 kB / 0.9467 GB, free: 16.31 MB / 0.7325 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001458/1.506, allocations: 0.9233 MB / 0.9476 GB, free: 15.95 MB / 0.7325 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.728e-05/1.506, allocations: 75.58 kB / 0.9476 GB, free: 15.94 MB / 0.7325 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001531/1.507, allocations: 106.1 kB / 0.9477 GB, free: 15.94 MB / 0.7325 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001606/1.508, allocations: 1.108 MB / 0.9488 GB, free: 15.71 MB / 0.7325 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.662e-05/1.508, allocations: 6.906 kB / 0.9488 GB, free: 15.71 MB / 0.7325 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.703e-05/1.508, allocations: 46.75 kB / 0.9489 GB, free: 15.71 MB / 0.7325 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.894e-05/1.508, allocations: 37.08 kB / 0.9489 GB, free: 15.71 MB / 0.7325 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001269/1.51, allocations: 0.8091 MB / 0.9497 GB, free: 15.7 MB / 0.7325 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 0.005582/1.515, allocations: 5.088 MB / 0.9547 GB, free: 12.77 MB / 0.7325 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.001105/1.516, allocations: 0.6757 MB / 0.9553 GB, free: 12.73 MB / 0.7325 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0005227/1.517, allocations: 355.6 kB / 0.9557 GB, free: 12.72 MB / 0.7325 GB
Notification: Performance of preOpt evalFunc (simulation): time 0.0006126/1.518, allocations: 327.2 kB / 0.956 GB, free: 12.43 MB / 0.7325 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 2.976e-05/1.518, allocations: 46.03 kB / 0.956 GB, free: 12.39 MB / 0.7325 GB
Notification: Performance of pre-optimization done (n=70): time 3.747e-06/1.518, allocations: 0 / 0.956 GB, free: 12.39 MB / 0.7325 GB
Notification: Performance of matching and sorting (n=70): time 0.001809/1.519, allocations: 0.9311 MB / 0.9569 GB, free: 12.29 MB / 0.7325 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 4.795e-05/1.519, allocations: 60.5 kB / 0.957 GB, free: 12.23 MB / 0.7325 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0009982/1.52, allocations: 0.8778 MB / 0.9578 GB, free: 12.08 MB / 0.7325 GB
Notification: Performance of collectPreVariables (initialization): time 6.379e-05/1.521, allocations: 42.86 kB / 0.9579 GB, free: 12.05 MB / 0.7325 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0003877/1.521, allocations: 0.5596 MB / 0.9584 GB, free: 11.82 MB / 0.7325 GB
Notification: Performance of collectInitialBindings (initialization): time 0.0002047/1.521, allocations: 250 kB / 0.9587 GB, free: 11.67 MB / 0.7325 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 8.842e-05/1.521, allocations: 67.97 kB / 0.9587 GB, free: 11.65 MB / 0.7325 GB
Notification: Performance of setup shared object (initialization): time 0.0001164/1.521, allocations: 336 kB / 0.959 GB, free: 11.34 MB / 0.7325 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0004155/1.522, allocations: 246.7 kB / 0.9593 GB, free: 11.34 MB / 0.7325 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.000534/1.522, allocations: 453.5 kB / 0.9597 GB, free: 11.14 MB / 0.7325 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0009717/1.523, allocations: 0.7048 MB / 0.9604 GB, free: 10.96 MB / 0.7325 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.94e-06/1.523, allocations: 3.25 kB / 0.9604 GB, free: 10.96 MB / 0.7325 GB
Notification: Performance of matching and sorting (n=94) (initialization): time 0.001232/1.525, allocations: 0.8266 MB / 0.9612 GB, free: 10.85 MB / 0.7325 GB
Notification: Performance of prepare postOptimizeDAE: time 0.0001451/1.525, allocations: 228.1 kB / 0.9614 GB, free: 10.59 MB / 0.7325 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.278e-06/1.525, allocations: 3.094 kB / 0.9614 GB, free: 10.59 MB / 0.7325 GB
Notification: Performance of postOpt tearingSystem (initialization): time 1.818e-05/1.525, allocations: 8.438 kB / 0.9614 GB, free: 10.59 MB / 0.7325 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001445/1.526, allocations: 268.3 kB / 0.9617 GB, free: 10.57 MB / 0.7325 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001337/1.528, allocations: 1.391 MB / 0.9631 GB, free: 9.219 MB / 0.7325 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.000895/1.528, allocations: 112.6 kB / 0.9632 GB, free: 9.176 MB / 0.7325 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.33e-05/1.529, allocations: 30.53 kB / 0.9632 GB, free: 9.176 MB / 0.7325 GB
Notification: Performance of prepare postOptimizeDAE: time 7.253e-06/1.529, allocations: 6.031 kB / 0.9632 GB, free: 9.176 MB / 0.7325 GB
Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001081/1.53, allocations: 0.7052 MB / 0.9639 GB, free: 9.156 MB / 0.7325 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.882e-06/1.53, allocations: 5.094 kB / 0.9639 GB, free: 9.156 MB / 0.7325 GB
Notification: Performance of postOpt tearingSystem (initialization): time 7.324e-06/1.53, allocations: 13.06 kB / 0.9639 GB, free: 9.152 MB / 0.7325 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001341/1.531, allocations: 248.2 kB / 0.9641 GB, free: 9.148 MB / 0.7325 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001171/1.532, allocations: 1.397 MB / 0.9655 GB, free: 7.793 MB / 0.7325 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0009016/1.533, allocations: 105.5 kB / 0.9656 GB, free: 7.754 MB / 0.7325 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.523e-05/1.533, allocations: 32.19 kB / 0.9656 GB, free: 7.75 MB / 0.7325 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 (not torn): 1
 * Torn equation systems: 0
 * Mixed (continuous/discrete) equation systems: 0
Notification: Equation system details (not torn):
 * Constant Jacobian (size): 0 systems
 * Linear Jacobian (size,density): 0 systems
 * Non-linear Jacobian (size): 1 system
   {1}
 * Without analytic Jacobian (size): 0 systems
Notification: Performance of prepare postOptimizeDAE: time 0.000664/1.534, allocations: 376.9 kB / 0.966 GB, free: 7.555 MB / 0.7325 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001565/1.534, allocations: 110.7 kB / 0.9661 GB, free: 7.496 MB / 0.7325 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001696/1.536, allocations: 0.7878 MB / 0.9669 GB, free: 7.422 MB / 0.7325 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.027e-06/1.536, allocations: 9.266 kB / 0.9669 GB, free: 7.418 MB / 0.7325 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 2.284e-06/1.536, allocations: 0 / 0.9669 GB, free: 7.418 MB / 0.7325 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001244/1.537, allocations: 0.7054 MB / 0.9676 GB, free: 7.234 MB / 0.7325 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003312/1.54, allocations: 1.932 MB / 0.9695 GB, free: 6.832 MB / 0.7325 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.831e-06/1.54, allocations: 2.938 kB / 0.9695 GB, free: 6.832 MB / 0.7325 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0006549/1.541, allocations: 143.4 kB / 0.9696 GB, free: 6.832 MB / 0.7325 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.0004152/1.541, allocations: 54.19 kB / 0.9696 GB, free: 6.816 MB / 0.7325 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.908e-05/1.541, allocations: 20.84 kB / 0.9697 GB, free: 6.816 MB / 0.7325 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001315/1.543, allocations: 1.35 MB / 0.971 GB, free: 5.531 MB / 0.7325 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.617e-06/1.543, allocations: 6.656 kB / 0.971 GB, free: 5.531 MB / 0.7325 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002258/1.545, allocations: 1.248 MB / 0.9722 GB, free: 5.238 MB / 0.7325 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0004562/1.546, allocations: 258.2 kB / 0.9725 GB, free: 5.078 MB / 0.7325 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001076/1.546, allocations: 21.38 kB / 0.9725 GB, free: 5.074 MB / 0.7325 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006597/1.546, allocations: 60.81 kB / 0.9725 GB, free: 5.066 MB / 0.7325 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 9.57e-05/1.546, allocations: 52.98 kB / 0.9726 GB, free: 5.059 MB / 0.7325 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.819e-05/1.546, allocations: 23.78 kB / 0.9726 GB, free: 5.059 MB / 0.7325 GB
Notification: Performance of sorting global known variables: time 0.0009799/1.547, allocations: 0.5955 MB / 0.9732 GB, free: 4.949 MB / 0.7325 GB
Notification: Performance of sort global known variables: time 1.3e-07/1.547, allocations: 0 / 0.9732 GB, free: 4.949 MB / 0.7325 GB
Notification: Performance of remove unused functions: time 0.001801/1.549, allocations: 0.5356 MB / 0.9737 GB, free: 4.863 MB / 0.7325 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 8
 * Number of states: 7 (vol1.dynBal.U,vol1.dynBal.m,vol1.dynBal.mXi[1],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 (not torn): 0
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 0 systems
 * Non-linear torn systems (#iteration vars, #inner vars): 1 system
   {(1,1)}
Notification: Performance of Backend phase and start with SimCode phase: time 0.0006347/1.55, allocations: 214.9 kB / 0.9739 GB, free: 4.754 MB / 0.7325 GB
Notification: Performance of simCode: created initialization part: time 0.003715/1.554, allocations: 1.186 MB / 0.9751 GB, free: 4.727 MB / 0.7325 GB
Notification: Performance of simCode: created event and clocks part: time 3.817e-06/1.554, allocations: 192 / 0.9751 GB, free: 4.727 MB / 0.7325 GB
Notification: Performance of simCode: created simulation system equations: time 0.0007491/1.554, allocations: 451.9 kB / 0.9755 GB, free: 4.609 MB / 0.7325 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002775/1.557, allocations: 0.5092 MB / 0.976 GB, free: 4.57 MB / 0.7325 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004246/1.561, allocations: 2.748 MB / 0.9787 GB, free: 3.066 MB / 0.7325 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000946/1.562, allocations: 1.142 MB / 0.9798 GB, free: 2.348 MB / 0.7325 GB
Notification: Performance of simCode: alias equations: time 0.001331/1.564, allocations: 272.3 kB / 0.9801 GB, free: 2.289 MB / 0.7325 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002197/1.564, allocations: 79.42 kB / 0.9801 GB, free: 2.281 MB / 0.7325 GB
Notification: Performance of SimCode: time 9.62e-07/1.564, allocations: 2.938 kB / 0.9801 GB, free: 2.281 MB / 0.7325 GB
Notification: Performance of Templates: time 0.03528/1.599, allocations: 17.07 MB / 0.9968 GB, free: 10.74 MB / 0.7481 GB
make -j1 -f Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.makefile
Environment - environmentSimulation:
(rm -f Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.sim & ./Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir  -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeMoistAir.pipe 2>&1)
Environment - environmentSimulation: