Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.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/IBPSA 4.0.0-master/package.mo", uses=false)
Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-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(IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_FixedResistances_Validation_PressureDropsExplicit",fmuType="me",version="2.0",platforms={"static"})
"" <> buildModelFMU(IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_FixedResistances_Validation_PressureDropsExplicit",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 0.0009801/0.00098, allocations: 97.52 kB / 15.69 MB, free: 488 kB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001312/0.001312, allocations: 175.6 kB / 16.57 MB, free: 6.391 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.279/1.279, allocations: 223.2 MB / 240.5 MB, free: 5.441 MB / 190.1 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.6905/0.6905, allocations: 113.7 MB / 405.3 MB, free: 4.672 MB / 334.1 MB
Notification: Performance of FrontEnd - loaded program: time 0.0003139/0.0003139, allocations: 16.67 kB / 493 MB, free: 8.578 MB / 350.1 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.1435/0.1438, allocations: 77.11 MB / 0.5567 GB, free: 11.66 MB / 430.1 MB
Notification: Performance of NFInst.instantiate(IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit): time 0.5331/0.677, allocations: 198 MB / 0.7501 GB, free: 3.961 MB / 0.5606 GB
Notification: Performance of NFInst.instExpressions: time 0.01368/0.6907, allocations: 12.02 MB / 0.7618 GB, free: 7.918 MB / 0.5762 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.001788/0.6925, allocations: 51.56 kB / 0.7619 GB, free: 7.867 MB / 0.5762 GB
Notification: Performance of NFTyping.typeComponents: time 0.002921/0.6954, allocations: 0.9295 MB / 0.7628 GB, free: 6.934 MB / 0.5762 GB
Notification: Performance of NFTyping.typeBindings: time 0.00624/0.7017, allocations: 2.233 MB / 0.765 GB, free: 4.695 MB / 0.5762 GB
Notification: Performance of NFTyping.typeClassSections: time 0.004092/0.7058, allocations: 1.417 MB / 0.7663 GB, free: 3.305 MB / 0.5762 GB
Notification: Performance of NFFlatten.flatten: time 0.003629/0.7094, allocations: 1.994 MB / 0.7683 GB, free: 1.305 MB / 0.5762 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.00115/0.7106, allocations: 0.8388 MB / 0.7691 GB, free: 464 kB / 0.5762 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.00537/0.716, allocations: 2.442 MB / 0.7715 GB, free: 14 MB / 0.5919 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.0009354/0.7169, allocations: 0.5872 MB / 0.7721 GB, free: 13.41 MB / 0.5919 GB
Notification: Performance of NFPackage.collectConstants: time 0.0001072/0.717, allocations: 48 kB / 0.7721 GB, free: 13.37 MB / 0.5919 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.001535/0.7186, allocations: 0.7216 MB / 0.7728 GB, free: 12.64 MB / 0.5919 GB
Notification: Performance of NFScalarize.scalarize: time 0.000343/0.7189, allocations: 378.8 kB / 0.7732 GB, free: 12.27 MB / 0.5919 GB
Notification: Performance of NFVerifyModel.verify: time 0.0003553/0.7193, allocations: 285 kB / 0.7735 GB, free: 11.99 MB / 0.5919 GB
Notification: Performance of NFConvertDAE.convert: time 0.001184/0.7205, allocations: 1.147 MB / 0.7746 GB, free: 10.84 MB / 0.5919 GB
Notification: Performance of FrontEnd - DAE generated: time 3.186e-06/0.7205, allocations: 0 / 0.7746 GB, free: 10.84 MB / 0.5919 GB
Notification: Performance of FrontEnd: time 2.063e-06/0.7205, allocations: 4 kB / 0.7746 GB, free: 10.84 MB / 0.5919 GB
Notification: Performance of Transformations before backend: time 1.294e-05/0.7205, allocations: 0 / 0.7746 GB, free: 10.84 MB / 0.5919 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 193
 * Number of variables: 193
Notification: Performance of Generate backend data structure: time 0.00188/0.7224, allocations: 1.398 MB / 0.7759 GB, free: 9.387 MB / 0.5919 GB
Notification: Performance of prepare preOptimizeDAE: time 3.774e-05/0.7225, allocations: 8.031 kB / 0.776 GB, free: 9.379 MB / 0.5919 GB
Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0001383/0.7226, allocations: 138.6 kB / 0.7761 GB, free: 9.234 MB / 0.5919 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0005656/0.7232, allocations: 203 kB / 0.7763 GB, free: 9.035 MB / 0.5919 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001212/0.7244, allocations: 0.7967 MB / 0.7771 GB, free: 8.184 MB / 0.5919 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001236/0.7245, allocations: 129.3 kB / 0.7772 GB, free: 8.047 MB / 0.5919 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.000102/0.7246, allocations: 84 kB / 0.7773 GB, free: 7.965 MB / 0.5919 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001259/0.7259, allocations: 0.9306 MB / 0.7782 GB, free: 6.941 MB / 0.5919 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.168e-05/0.7259, allocations: 11.89 kB / 0.7782 GB, free: 6.93 MB / 0.5919 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.077e-05/0.726, allocations: 32 kB / 0.7782 GB, free: 6.898 MB / 0.5919 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.975e-05/0.726, allocations: 20 kB / 0.7782 GB, free: 6.879 MB / 0.5919 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.000813/0.7269, allocations: 0.5256 MB / 0.7787 GB, free: 6.359 MB / 0.5919 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 0.004402/0.7313, allocations: 4.912 MB / 0.7835 GB, free: 1.133 MB / 0.5919 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.000469/0.7317, allocations: 436.7 kB / 0.784 GB, free: 0.5781 MB / 0.5919 GB
Notification: Performance of preOpt evalFunc (simulation): time 5.108e-05/0.7318, allocations: 19.92 kB / 0.784 GB, free: 0.5586 MB / 0.5919 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.67e-05/0.7319, allocations: 54.48 kB / 0.784 GB, free: 0.4961 MB / 0.5919 GB
Notification: Performance of pre-optimization done (n=35): time 1.743e-06/0.7319, allocations: 0 / 0.784 GB, free: 0.4961 MB / 0.5919 GB
Notification: Performance of matching and sorting (n=35): time 0.002077/0.7339, allocations: 0.8887 MB / 0.7849 GB, free: 15.56 MB / 0.6075 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001503/0.7341, allocations: 409.5 kB / 0.7853 GB, free: 15.07 MB / 0.6075 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001257/0.7354, allocations: 1.22 MB / 0.7865 GB, free: 13.84 MB / 0.6075 GB
Notification: Performance of collectPreVariables (initialization): time 5.117e-05/0.7354, allocations: 41.7 kB / 0.7865 GB, free: 13.79 MB / 0.6075 GB
Notification: Performance of collectInitialEqns (initialization): time 0.000386/0.7358, allocations: 0.534 MB / 0.787 GB, free: 13.25 MB / 0.6075 GB
Notification: Performance of collectInitialBindings (initialization): time 8.996e-05/0.7359, allocations: 126.2 kB / 0.7872 GB, free: 13.13 MB / 0.6075 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 1.319e-05/0.7359, allocations: 4 kB / 0.7872 GB, free: 13.12 MB / 0.6075 GB
Notification: Performance of setup shared object (initialization): time 9.496e-05/0.736, allocations: 326 kB / 0.7875 GB, free: 12.8 MB / 0.6075 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0001923/0.7362, allocations: 95.94 kB / 0.7876 GB, free: 12.71 MB / 0.6075 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0003583/0.7366, allocations: 339.5 kB / 0.7879 GB, free: 12.28 MB / 0.6075 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0002379/0.7369, allocations: 151.7 kB / 0.788 GB, free: 12.13 MB / 0.6075 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.575e-06/0.7369, allocations: 0 / 0.788 GB, free: 12.13 MB / 0.6075 GB
Notification: Performance of matching and sorting (n=37) (initialization): time 0.001036/0.7379, allocations: 0.5444 MB / 0.7886 GB, free: 11.57 MB / 0.6075 GB
Notification: Performance of prepare postOptimizeDAE: time 0.0004786/0.7384, allocations: 1.35 MB / 0.7899 GB, free: 10.1 MB / 0.6075 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.018e-05/0.7384, allocations: 8 kB / 0.7899 GB, free: 10.09 MB / 0.6075 GB
Notification: Performance of postOpt tearingSystem (initialization): time 0.0005258/0.7389, allocations: 117.6 kB / 0.79 GB, free: 9.969 MB / 0.6075 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004313/0.7394, allocations: 87.88 kB / 0.7901 GB, free: 9.883 MB / 0.6075 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001214/0.7406, allocations: 2.316 MB / 0.7923 GB, free: 7.469 MB / 0.6075 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0006676/0.7413, allocations: 115.4 kB / 0.7925 GB, free: 7.355 MB / 0.6075 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.103e-05/0.7413, allocations: 24 kB / 0.7925 GB, free: 7.332 MB / 0.6075 GB
Notification: Performance of prepare postOptimizeDAE: time 7.845e-06/0.7414, allocations: 8 kB / 0.7925 GB, free: 7.324 MB / 0.6075 GB
Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.0006495/0.742, allocations: 365.6 kB / 0.7928 GB, free: 6.961 MB / 0.6075 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.759e-06/0.742, allocations: 4 kB / 0.7928 GB, free: 6.957 MB / 0.6075 GB
Notification: Performance of postOpt tearingSystem (initialization): time 0.0001943/0.7422, allocations: 69.67 kB / 0.7929 GB, free: 6.883 MB / 0.6075 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000223/0.7425, allocations: 71.92 kB / 0.793 GB, free: 6.812 MB / 0.6075 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.00209/0.7446, allocations: 3.047 MB / 0.796 GB, free: 3.477 MB / 0.6075 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0005977/0.7452, allocations: 107.2 kB / 0.7961 GB, free: 3.371 MB / 0.6075 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.094e-05/0.7452, allocations: 20 kB / 0.7961 GB, free: 3.352 MB / 0.6075 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 15
 * 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 (31):
 * Single equations (assignments): 27
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (linear and non-linear blocks): 2
 * 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: 2 {1,1}
 * Without analytic Jacobian: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems: 0
 * Non-linear torn systems: 2 {1 3,1 3}
Notification: Performance of prepare postOptimizeDAE: time 0.0003683/0.7456, allocations: 354.7 kB / 0.7964 GB, free: 2.996 MB / 0.6075 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003202/0.7459, allocations: 134.3 kB / 0.7965 GB, free: 2.863 MB / 0.6075 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0007228/0.7466, allocations: 460.6 kB / 0.797 GB, free: 2.391 MB / 0.6075 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.64e-06/0.7466, allocations: 8 kB / 0.797 GB, free: 2.383 MB / 0.6075 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 3.706e-06/0.7467, allocations: 4 kB / 0.797 GB, free: 2.379 MB / 0.6075 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 7.514e-06/0.7467, allocations: 7.984 kB / 0.797 GB, free: 2.371 MB / 0.6075 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002812/0.7495, allocations: 2.562 MB / 0.7995 GB, free: 15.67 MB / 0.6231 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.011e-06/0.7495, allocations: 4 kB / 0.7995 GB, free: 15.66 MB / 0.6231 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002418/0.7498, allocations: 67.91 kB / 0.7996 GB, free: 15.6 MB / 0.6231 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.0001623/0.7499, allocations: 77.66 kB / 0.7996 GB, free: 15.52 MB / 0.6231 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 1.838e-05/0.75, allocations: 12 kB / 0.7997 GB, free: 15.5 MB / 0.6231 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.00109/0.751, allocations: 2.316 MB / 0.8019 GB, free: 13.09 MB / 0.6231 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.237e-06/0.7511, allocations: 8.094 kB / 0.8019 GB, free: 13.08 MB / 0.6231 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.000984/0.7521, allocations: 1.095 MB / 0.803 GB, free: 11.75 MB / 0.6231 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0003422/0.7524, allocations: 251.3 kB / 0.8032 GB, free: 11.48 MB / 0.6231 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001181/0.7525, allocations: 15.98 kB / 0.8032 GB, free: 11.47 MB / 0.6231 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006408/0.7532, allocations: 67.88 kB / 0.8033 GB, free: 11.4 MB / 0.6231 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 6.728e-05/0.7533, allocations: 36.19 kB / 0.8033 GB, free: 11.37 MB / 0.6231 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 3.564e-05/0.7533, allocations: 24.17 kB / 0.8034 GB, free: 11.34 MB / 0.6231 GB
Notification: Performance of sorting global known variables: time 0.0009334/0.7542, allocations: 0.8488 MB / 0.8042 GB, free: 10.5 MB / 0.6231 GB
Notification: Performance of sort global known variables: time 2.2e-07/0.7542, allocations: 3.938 kB / 0.8042 GB, free: 10.49 MB / 0.6231 GB
Notification: Performance of remove unused functions: time 0.001118/0.7554, allocations: 443.4 kB / 0.8046 GB, free: 10.06 MB / 0.6231 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 22
 * 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 (27):
 * Single equations (assignments): 23
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (linear and non-linear blocks): 2
 * 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: 2 {1,1}
 * Without analytic Jacobian: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems: 0
 * Non-linear torn systems: 2 {1 3,1 3}
Notification: Performance of Backend phase and start with SimCode phase: time 0.002014/0.7574, allocations: 3.123 MB / 0.8077 GB, free: 6.77 MB / 0.6231 GB
Notification: Performance of simCode: created initialization part: time 0.001491/0.7589, allocations: 0.7373 MB / 0.8084 GB, free: 6.008 MB / 0.6231 GB
Notification: Performance of simCode: created event and clocks part: time 3.236e-06/0.7589, allocations: 0 / 0.8084 GB, free: 6.008 MB / 0.6231 GB
Notification: Performance of simCode: created simulation system equations: time 0.0004303/0.7593, allocations: 204.9 kB / 0.8086 GB, free: 5.809 MB / 0.6231 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003119/0.7625, allocations: 0.7504 MB / 0.8093 GB, free: 5.07 MB / 0.6231 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003787/0.7663, allocations: 4.921 MB / 0.8141 GB, free: 15.96 MB / 0.6387 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006917/0.767, allocations: 1.158 MB / 0.8153 GB, free: 14.78 MB / 0.6387 GB
Notification: Performance of simCode: alias equations: time 0.0007778/0.7678, allocations: 282.6 kB / 0.8155 GB, free: 14.5 MB / 0.6387 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0004288/0.7682, allocations: 443.3 kB / 0.816 GB, free: 14.07 MB / 0.6387 GB
Notification: Performance of SimCode: time 2.61e-07/0.7682, allocations: 0 / 0.816 GB, free: 14.07 MB / 0.6387 GB
Notification: Performance of buildModelFMU: Generate the FMI files: time 0.9285/1.697, allocations: 33.06 MB / 0.8482 GB, free: 227.1 MB / 0.6387 GB
Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001662/1.697, allocations: 266.8 kB / 0.8485 GB, free: 226.8 MB / 0.6387 GB
Notification: Performance of buildModelFMU: Generate platform static: time 2.69/4.387, allocations: 0 / 0.8485 GB, free: 226.8 MB / 0.6387 GB
(rm -f IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator  --tempDir=temp_IBPSA_latest_IBPSA_Fluid_FixedResistances_Validation_PressureDropsExplicit_fmu --startTime=-1 --stopTime=1 --timeout=50 --tolerance=1e-06 IBPSA_latest_IBPSA_Fluid_FixedResistances_Validation_PressureDropsExplicit.fmu > IBPSA_latest_IBPSA.Fluid.FixedResistances.Validation.PressureDropsExplicit.pipe 2>&1)
Environment - environmentSimulation: