Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.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 1.6.0+build.1/package.mo", uses=false) Using package Buildings with version 1.6 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 1.6.0+build.1/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.Airflow.Multizone.Examples.Validation3Rooms,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms") translateModel(Buildings.Airflow.Multizone.Examples.Validation3Rooms,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0009485/0.0009483, allocations: 86.8 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 0.001168/0.001168, 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 1.839/1.839, allocations: 205.4 MB / 222.1 MB, free: 5.652 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 1.6.0+build.1/package.mo): time 0.6817/0.6817, allocations: 95.63 MB / 366 MB, free: 10.38 MB / 302.1 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: Buildings requested package Modelica of version 3.2.1. 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 0.0005402/0.0005404, allocations: 12.22 kB / 446.8 MB, free: 9.387 MB / 382.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3991/0.3997, allocations: 70.34 MB / 0.5051 GB, free: 16.51 MB / 382.1 MB Notification: Performance of NFInst.instantiate(Buildings.Airflow.Multizone.Examples.Validation3Rooms): time 0.6676/1.067, allocations: 190 MB / 0.6906 GB, free: 0.6953 MB / 494.1 MB Notification: Performance of NFInst.instExpressions: time 0.02169/1.089, allocations: 14.27 MB / 0.7045 GB, free: 15.86 MB / 0.4981 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.005026/1.094, allocations: 83.03 kB / 0.7046 GB, free: 15.86 MB / 0.4981 GB Notification: Performance of NFTyping.typeComponents: time 0.004628/1.099, allocations: 0.8516 MB / 0.7054 GB, free: 15.57 MB / 0.4981 GB [/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 0.01198/1.111, allocations: 2.632 MB / 0.708 GB, free: 14.88 MB / 0.4981 GB Notification: Performance of NFTyping.typeClassSections: time 0.006437/1.117, allocations: 1.528 MB / 0.7095 GB, free: 14.52 MB / 0.4981 GB Notification: Performance of NFFlatten.flatten: time 0.01461/1.132, allocations: 6.737 MB / 0.7161 GB, free: 13.17 MB / 0.4981 GB Notification: Performance of NFFlatten.resolveConnections: time 0.005036/1.137, allocations: 1.565 MB / 0.7176 GB, free: 12.56 MB / 0.4981 GB Notification: Performance of NFEvalConstants.evaluate: time 0.00695/1.144, allocations: 1.936 MB / 0.7195 GB, free: 12.29 MB / 0.4981 GB Notification: Performance of NFSimplifyModel.simplify: time 0.005642/1.15, allocations: 2.244 MB / 0.7217 GB, free: 11.46 MB / 0.4981 GB Notification: Performance of NFPackage.collectConstants: time 0.0008472/1.151, allocations: 116 kB / 0.7218 GB, free: 11.35 MB / 0.4981 GB Notification: Performance of NFFlatten.collectFunctions: time 0.006591/1.157, allocations: 1.518 MB / 0.7233 GB, free: 10.17 MB / 0.4981 GB Notification: Performance of NFScalarize.scalarize: time 0.001023/1.158, allocations: 0.5185 MB / 0.7238 GB, free: 9.809 MB / 0.4981 GB Notification: Performance of NFVerifyModel.verify: time 0.001516/1.16, allocations: 464.3 kB / 0.7242 GB, free: 9.465 MB / 0.4981 GB Notification: Performance of NFConvertDAE.convert: time 0.005401/1.165, allocations: 2.561 MB / 0.7267 GB, free: 7.164 MB / 0.4981 GB Notification: Performance of FrontEnd - DAE generated: time 7.705e-06/1.165, allocations: 0 / 0.7267 GB, free: 7.164 MB / 0.4981 GB Notification: Performance of FrontEnd: time 2.635e-06/1.165, allocations: 0 / 0.7267 GB, free: 7.164 MB / 0.4981 GB Notification: Performance of Transformations before backend: time 5.151e-05/1.165, allocations: 0 / 0.7267 GB, free: 7.164 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: 451 * Number of variables: 451 Notification: Performance of Generate backend data structure: time 0.005694/1.171, allocations: 2.41 MB / 0.7291 GB, free: 4.863 MB / 0.4981 GB Notification: Performance of prepare preOptimizeDAE: time 4.986e-05/1.171, allocations: 11.98 kB / 0.7291 GB, free: 4.852 MB / 0.4981 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0007349/1.172, allocations: 257.2 kB / 0.7294 GB, free: 4.598 MB / 0.4981 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002329/1.174, allocations: 1.307 MB / 0.7306 GB, free: 3.527 MB / 0.4981 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 9.236e-05/1.174, allocations: 132.4 kB / 0.7308 GB, free: 3.457 MB / 0.4981 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002369/1.175, allocations: 177.6 kB / 0.7309 GB, free: 3.34 MB / 0.4981 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003443/1.178, allocations: 2.098 MB / 0.733 GB, free: 1.855 MB / 0.4981 GB Notification: Performance of preOpt findStateOrder (simulation): time 4.263e-05/1.178, allocations: 7.906 kB / 0.733 GB, free: 1.848 MB / 0.4981 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001679/1.178, allocations: 71.75 kB / 0.7331 GB, free: 1.832 MB / 0.4981 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.264e-05/1.178, allocations: 44 kB / 0.7331 GB, free: 1.789 MB / 0.4981 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003741/1.182, allocations: 2.062 MB / 0.7351 GB, free: 384 kB / 0.4981 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 0.0139/1.196, allocations: 7.717 MB / 0.7426 GB, free: 9.605 MB / 0.5137 GB Notification: Performance of preOpt comSubExp (simulation): time 0.003332/1.199, allocations: 1.988 MB / 0.7446 GB, free: 8.438 MB / 0.5137 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.002114/1.201, allocations: 1.149 MB / 0.7457 GB, free: 7.371 MB / 0.5137 GB Notification: Performance of preOpt evalFunc (simulation): time 0.002976/1.204, allocations: 3.116 MB / 0.7487 GB, free: 3.57 MB / 0.5137 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.375e-05/1.205, allocations: 58.42 kB / 0.7488 GB, free: 3.508 MB / 0.5137 GB Notification: Performance of pre-optimization done (n=202): time 4.649e-06/1.205, allocations: 0 / 0.7488 GB, free: 3.508 MB / 0.5137 GB Notification: Performance of matching and sorting (n=220): time 0.01555/1.22, allocations: 6.236 MB / 0.7549 GB, free: 13.25 MB / 0.5294 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.949e-05/1.22, allocations: 99.11 kB / 0.755 GB, free: 13.14 MB / 0.5294 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001962/1.222, allocations: 1.101 MB / 0.7561 GB, free: 12.03 MB / 0.5294 GB Notification: Performance of collectPreVariables (initialization): time 0.0001814/1.222, allocations: 65.7 kB / 0.7561 GB, free: 11.96 MB / 0.5294 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005897/1.223, allocations: 0.694 MB / 0.7568 GB, free: 11.25 MB / 0.5294 GB Notification: Performance of collectInitialBindings (initialization): time 0.0007135/1.224, allocations: 0.739 MB / 0.7575 GB, free: 10.51 MB / 0.5294 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001117/1.224, allocations: 36 kB / 0.7576 GB, free: 10.47 MB / 0.5294 GB Notification: Performance of setup shared object (initialization): time 0.0002082/1.224, allocations: 385.8 kB / 0.7579 GB, free: 10.09 MB / 0.5294 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001391/1.226, allocations: 0.7652 MB / 0.7587 GB, free: 9.324 MB / 0.5294 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001583/1.227, allocations: 1.009 MB / 0.7597 GB, free: 8.246 MB / 0.5294 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001648/1.229, allocations: 0.9176 MB / 0.7606 GB, free: 7.332 MB / 0.5294 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.967e-06/1.229, allocations: 4 kB / 0.7606 GB, free: 7.328 MB / 0.5294 GB Notification: Performance of matching and sorting (n=248) (initialization): time 0.004157/1.233, allocations: 2.198 MB / 0.7627 GB, free: 5.121 MB / 0.5294 GB Notification: Performance of prepare postOptimizeDAE: time 3.031e-05/1.233, allocations: 8 kB / 0.7627 GB, free: 5.113 MB / 0.5294 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.086e-05/1.233, allocations: 4 kB / 0.7627 GB, free: 5.109 MB / 0.5294 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.727e-05/1.233, allocations: 17.75 kB / 0.7627 GB, free: 5.094 MB / 0.5294 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.00247/1.236, allocations: 0.5195 MB / 0.7632 GB, free: 4.574 MB / 0.5294 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 5.581e-05/1.236, allocations: 15.94 kB / 0.7633 GB, free: 4.559 MB / 0.5294 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001826/1.237, allocations: 163.7 kB / 0.7634 GB, free: 4.398 MB / 0.5294 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002171/1.238, allocations: 71.98 kB / 0.7635 GB, free: 4.328 MB / 0.5294 GB Warning: Assuming fixed start value for the following 3 variables: volTop.dynBal.medium.p:VARIABLE(flow=false min = max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, 0.0))))))))) max = min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, 100000000.0)))))))) start = volTop.dynBal.p_start unit = "Pa" fixed = true nominal = 100000.0 stateSelect=StateSelect.prefer protected = true ) "Absolute pressure of medium" type: Real volWes.dynBal.medium.p:VARIABLE(flow=false min = max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, 0.0)))))))))))) max = min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, 100000000.0))))))))))) start = volWes.dynBal.p_start unit = "Pa" fixed = true nominal = 100000.0 stateSelect=StateSelect.prefer protected = true ) "Absolute pressure of medium" type: Real volEas.dynBal.medium.p:VARIABLE(flow=false min = max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, max(0.0, 0.0))))))))))))))))))) max = min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, min(100000000.0, 100000000.0)))))))))))))))))) start = volEas.dynBal.p_start unit = "Pa" fixed = true nominal = 100000.0 stateSelect=StateSelect.prefer protected = true ) "Absolute pressure of medium" type: Real Notification: Model statistics after passing the back-end for initialization: * 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 initialization (248): * Single equations (assignments): 248 * 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 0.001426/1.239, allocations: 0.6023 MB / 0.7641 GB, free: 3.719 MB / 0.5294 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005046/1.24, allocations: 185.8 kB / 0.7642 GB, free: 3.535 MB / 0.5294 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004937/1.245, allocations: 2.763 MB / 0.7669 GB, free: 0.7461 MB / 0.5294 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 3.125e-05/1.245, allocations: 23.98 kB / 0.767 GB, free: 0.7227 MB / 0.5294 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.038e-05/1.245, allocations: 4 kB / 0.767 GB, free: 0.7188 MB / 0.5294 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.422e-05/1.245, allocations: 11.95 kB / 0.767 GB, free: 0.707 MB / 0.5294 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.008494/1.253, allocations: 4.764 MB / 0.7716 GB, free: 11.84 MB / 0.545 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.43e-05/1.253, allocations: 8.031 kB / 0.7716 GB, free: 11.84 MB / 0.545 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002233/1.255, allocations: 483.4 kB / 0.7721 GB, free: 11.36 MB / 0.545 GB Notification: Performance of postOpt tearingSystem (simulation): time 4.123e-05/1.256, allocations: 12 kB / 0.7721 GB, free: 11.35 MB / 0.545 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001719/1.256, allocations: 55.98 kB / 0.7722 GB, free: 11.3 MB / 0.545 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 1.987e-05/1.256, allocations: 11.98 kB / 0.7722 GB, free: 11.29 MB / 0.545 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 6.051e-06/1.256, allocations: 7.938 kB / 0.7722 GB, free: 11.28 MB / 0.545 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005859/1.262, allocations: 3.654 MB / 0.7758 GB, free: 7.559 MB / 0.545 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001251/1.263, allocations: 0.4984 MB / 0.7762 GB, free: 7.039 MB / 0.545 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0004548/1.263, allocations: 48 kB / 0.7763 GB, free: 6.992 MB / 0.545 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001579/1.265, allocations: 141.6 kB / 0.7764 GB, free: 6.855 MB / 0.545 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002684/1.265, allocations: 153.8 kB / 0.7766 GB, free: 6.707 MB / 0.545 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001808/1.265, allocations: 75.97 kB / 0.7766 GB, free: 6.633 MB / 0.545 GB Notification: Performance of sorting global known variables: time 0.001345/1.267, allocations: 0.7782 MB / 0.7774 GB, free: 5.852 MB / 0.545 GB Notification: Performance of sort global known variables: time 2.51e-07/1.267, allocations: 0 / 0.7774 GB, free: 5.852 MB / 0.545 GB Notification: Performance of remove unused functions: time 0.002678/1.269, allocations: 0.7654 MB / 0.7782 GB, free: 5.086 MB / 0.545 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 15 * Number of states: 9 (volEas.dynBal.medium.p,oriOutBot.mExc,oriOutTop.mExc,oriWesTop.mExc,dooOpeClo.mExcAB,dooOpeClo.mExcBA,volWes.dynBal.medium.p,oriEasTop.mExc,volTop.dynBal.medium.p) * 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 (242): * Single equations (assignments): 236 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 6 * 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 0.001508/1.271, allocations: 0.6354 MB / 0.7788 GB, free: 4.449 MB / 0.545 GB Notification: Performance of simCode: created initialization part: time 0.003591/1.275, allocations: 2.079 MB / 0.7808 GB, free: 2.367 MB / 0.545 GB Notification: Performance of simCode: created event and clocks part: time 6.923e-06/1.275, allocations: 0 / 0.7808 GB, free: 2.367 MB / 0.545 GB Notification: Performance of simCode: created simulation system equations: time 0.00191/1.276, allocations: 1.171 MB / 0.7819 GB, free: 1.203 MB / 0.545 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.004198/1.281, allocations: 0.8995 MB / 0.7828 GB, free: 316 kB / 0.545 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.008097/1.289, allocations: 5.2 MB / 0.7879 GB, free: 11.04 MB / 0.5606 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001293/1.29, allocations: 1.463 MB / 0.7893 GB, free: 9.539 MB / 0.5606 GB Notification: Performance of simCode: alias equations: time 0.002613/1.293, allocations: 0.613 MB / 0.7899 GB, free: 8.922 MB / 0.5606 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0007007/1.293, allocations: 195.4 kB / 0.7901 GB, free: 8.73 MB / 0.5606 GB Notification: Performance of SimCode: time 7.01e-07/1.293, allocations: 0 / 0.7901 GB, free: 8.73 MB / 0.5606 GB Notification: Performance of Templates: time 0.06568/1.359, allocations: 39.13 MB / 0.8283 GB, free: 1.941 MB / 0.5919 GB make -j1 -f Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.makefile Environment - environmentSimulation: (rm -f Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.pipe ; mkfifo Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.pipe ; head -c 1048576 < Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.pipe >> ../files/Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.sim & ./Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_1.6_Buildings.Airflow.Multizone.Examples.Validation3Rooms.pipe 2>&1) Environment - environmentSimulation: