Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.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/NcDataReader2 2.5.1-master/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo", uses=false) Using package BuildingSystems with version 2.0.0-beta (/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo) Using package NcDataReader2 with version 2.5.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-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: translateModel(BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader") translateModel(BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0008526/0.0008526, allocations: 94.3 kB / 15.05 MB, free: 1.113 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.0008624/0.0008624, allocations: 181.3 kB / 15.95 MB, free: 220 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.196/1.196, allocations: 223.2 MB / 239.9 MB, free: 5.23 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-master/package.mo): time 0.001647/0.001647, allocations: 271 kB / 291.2 MB, free: 1.793 MB / 238.1 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:5:3-5:34:writable] Warning: Got element f_alp that was not referenced in the package.order file. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:6:3-6:35:writable] Warning: Elements in the package.mo-file need to be in the same relative order as the package.order file. Got element named f_lay but it was already added because it was not the next element in the list at that time. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:6:3-6:35:writable] Warning: Got element f_lay that was not referenced in the package.order file. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:7:3-7:37:writable] Warning: Elements in the package.mo-file need to be in the same relative order as the package.order file. Got element named f_loss but it was already added because it was not the next element in the list at that time. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:7:3-7:37:writable] Warning: Got element f_loss that was not referenced in the package.order file. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:8:3-8:33:writable] Warning: Elements in the package.mo-file need to be in the same relative order as the package.order file. Got element named f_pv but it was already added because it was not the next element in the list at that time. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:8:3-8:33:writable] Warning: Got element f_pv that was not referenced in the package.order file. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/Buildings/Airvolumes/Parameter/package.mo:2:1-34:14:writable] Warning: f_pv was referenced in the package.order file, but was not found in package.mo, f_pv/package.mo or f_pv.mo. Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo): time 0.7251/0.7251, allocations: 144.6 MB / 487 MB, free: 7.23 MB / 350.1 MB Notification: Performance of FrontEnd - loaded program: time 0.0004103/0.0004104, allocations: 15.69 kB / 0.5683 GB, free: 38.12 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1286/0.129, allocations: 83.09 MB / 0.6494 GB, free: 3.672 MB / 446.1 MB Notification: Performance of NFInst.instantiate(BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader): time 0.001075/0.1301, allocations: 0.9605 MB / 0.6504 GB, free: 2.699 MB / 446.1 MB Notification: Performance of NFInst.instExpressions: time 0.0007959/0.1309, allocations: 0.6795 MB / 0.651 GB, free: 2.02 MB / 446.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 2.021e-05/0.131, allocations: 0 / 0.651 GB, free: 2.02 MB / 446.1 MB Notification: Performance of NFTyping.typeComponents: time 2.708e-05/0.131, allocations: 0 / 0.651 GB, free: 2.02 MB / 446.1 MB Notification: Performance of NFTyping.typeBindings: time 0.0001217/0.1311, allocations: 15.91 kB / 0.6511 GB, free: 2.004 MB / 446.1 MB Notification: Performance of NFTyping.typeClassSections: time 5.973e-05/0.1312, allocations: 11.94 kB / 0.6511 GB, free: 1.992 MB / 446.1 MB Notification: Performance of NFFlatten.flatten: time 3.435e-05/0.1312, allocations: 2 kB / 0.6511 GB, free: 1.992 MB / 446.1 MB Notification: Performance of NFFlatten.resolveConnections: time 3.647e-05/0.1313, allocations: 0 / 0.6511 GB, free: 1.992 MB / 446.1 MB Notification: Performance of NFEvalConstants.evaluate: time 1.563e-05/0.1313, allocations: 7.984 kB / 0.6511 GB, free: 1.984 MB / 446.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.0001117/0.1314, allocations: 0 / 0.6511 GB, free: 1.984 MB / 446.1 MB Notification: Performance of NFPackage.collectConstants: time 8.836e-06/0.1314, allocations: 4 kB / 0.6511 GB, free: 1.98 MB / 446.1 MB Notification: Performance of NFFlatten.collectFunctions: time 2.53e-05/0.1315, allocations: 0 / 0.6511 GB, free: 1.98 MB / 446.1 MB Notification: Performance of NFScalarize.scalarize: time 3.637e-05/0.1315, allocations: 4.594 kB / 0.6511 GB, free: 1.977 MB / 446.1 MB Notification: Performance of NFVerifyModel.verify: time 2.191e-05/0.1315, allocations: 26.33 kB / 0.6511 GB, free: 1.945 MB / 446.1 MB Notification: Performance of NFConvertDAE.convert: time 5.086e-05/0.1316, allocations: 7.984 kB / 0.6511 GB, free: 1.938 MB / 446.1 MB Notification: Performance of FrontEnd - DAE generated: time 1.873e-06/0.1316, allocations: 0.5312 kB / 0.6511 GB, free: 1.938 MB / 446.1 MB Notification: Performance of FrontEnd: time 2.615e-06/0.1316, allocations: 1.594 kB / 0.6511 GB, free: 1.938 MB / 446.1 MB Notification: Performance of Transformations before backend: time 2.775e-06/0.1316, allocations: 3.938 kB / 0.6511 GB, free: 1.934 MB / 446.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 0 * Number of variables: 0 Notification: Performance of Generate backend data structure: time 0.0002541/0.1319, allocations: 319.4 kB / 0.6514 GB, free: 1.574 MB / 446.1 MB Notification: Performance of prepare preOptimizeDAE: time 2.808e-05/0.1319, allocations: 11.97 kB / 0.6514 GB, free: 1.562 MB / 446.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 4.791e-05/0.132, allocations: 80.34 kB / 0.6515 GB, free: 1.484 MB / 446.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0001386/0.1321, allocations: 239 kB / 0.6517 GB, free: 1.211 MB / 446.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.439e-05/0.1322, allocations: 155.7 kB / 0.6519 GB, free: 1.059 MB / 446.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 4.96e-05/0.1322, allocations: 150.6 kB / 0.652 GB, free: 0.9102 MB / 446.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 6.532e-05/0.1323, allocations: 114 kB / 0.6521 GB, free: 0.793 MB / 446.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.615e-05/0.1323, allocations: 76.81 kB / 0.6522 GB, free: 0.7188 MB / 446.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 4.917e-05/0.1324, allocations: 150.6 kB / 0.6524 GB, free: 0.5703 MB / 446.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.032e-05/0.1324, allocations: 151.3 kB / 0.6525 GB, free: 432 kB / 446.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 4.548e-05/0.1325, allocations: 155.8 kB / 0.6526 GB, free: 276 kB / 446.1 MB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.0003252/0.1328, allocations: 446.6 kB / 0.6531 GB, free: 15.79 MB / 462.1 MB Notification: Performance of preOpt comSubExp (simulation): time 9.63e-05/0.1329, allocations: 166.3 kB / 0.6532 GB, free: 15.61 MB / 462.1 MB Notification: Performance of preOpt evalFunc (simulation): time 2.676e-05/0.133, allocations: 83.75 kB / 0.6533 GB, free: 15.53 MB / 462.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.236e-05/0.133, allocations: 107.1 kB / 0.6534 GB, free: 15.42 MB / 462.1 MB Notification: Performance of pre-optimization done (n=0): time 1.052e-06/0.133, allocations: 0 / 0.6534 GB, free: 15.42 MB / 462.1 MB Notification: Performance of matching and sorting (n=0): time 7.208e-05/0.1331, allocations: 35.14 kB / 0.6534 GB, free: 15.38 MB / 462.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 6.574e-05/0.1332, allocations: 126.7 kB / 0.6536 GB, free: 15.24 MB / 462.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 8.967e-05/0.1333, allocations: 102.5 kB / 0.6537 GB, free: 15.13 MB / 462.1 MB Notification: Performance of collectPreVariables (initialization): time 1.276e-05/0.1333, allocations: 29.64 kB / 0.6537 GB, free: 15.1 MB / 462.1 MB Notification: Performance of collectInitialEqns (initialization): time 4.21e-05/0.1333, allocations: 84.89 kB / 0.6538 GB, free: 15.01 MB / 462.1 MB Notification: Performance of collectInitialBindings (initialization): time 1.413e-06/0.1333, allocations: 0 / 0.6538 GB, free: 15.01 MB / 462.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 1.1e-07/0.1333, allocations: 0.625 kB / 0.6538 GB, free: 15.01 MB / 462.1 MB Notification: Performance of setup shared object (initialization): time 0.0001039/0.1334, allocations: 315.7 kB / 0.6541 GB, free: 14.7 MB / 462.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 2.915e-06/0.1335, allocations: 0 / 0.6541 GB, free: 14.7 MB / 462.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 1.136e-05/0.1335, allocations: 0.7188 kB / 0.6541 GB, free: 14.7 MB / 462.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 2.947e-05/0.1335, allocations: 79.97 kB / 0.6542 GB, free: 14.62 MB / 462.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.953e-05/0.1335, allocations: 76.16 kB / 0.6542 GB, free: 14.54 MB / 462.1 MB Notification: Performance of matching and sorting (n=0) (initialization): time 5.559e-05/0.1336, allocations: 29.64 kB / 0.6543 GB, free: 14.51 MB / 462.1 MB Notification: Performance of prepare postOptimizeDAE: time 3.087e-05/0.1336, allocations: 87.98 kB / 0.6543 GB, free: 14.42 MB / 462.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.336e-05/0.1337, allocations: 81.67 kB / 0.6544 GB, free: 14.34 MB / 462.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 5.299e-05/0.1337, allocations: 154.5 kB / 0.6546 GB, free: 14.19 MB / 462.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 1.831e-05/0.1337, allocations: 75.28 kB / 0.6546 GB, free: 14.12 MB / 462.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 4.625e-05/0.1338, allocations: 154.6 kB / 0.6548 GB, free: 13.96 MB / 462.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0001146/0.1339, allocations: 84.31 kB / 0.6549 GB, free: 13.88 MB / 462.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 2.581e-05/0.1339, allocations: 80.98 kB / 0.6549 GB, free: 13.8 MB / 462.1 MB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 1 * 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 (0): * Single equations (assignments): 0 * 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 0.0001078/0.1341, allocations: 260.4 kB / 0.6552 GB, free: 13.54 MB / 462.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 5.141e-05/0.1341, allocations: 113.5 kB / 0.6553 GB, free: 13.42 MB / 462.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 3.931e-05/0.1342, allocations: 109.8 kB / 0.6554 GB, free: 13.31 MB / 462.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.722e-05/0.1342, allocations: 184.3 kB / 0.6556 GB, free: 13.12 MB / 462.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.631e-05/0.1343, allocations: 189 kB / 0.6558 GB, free: 12.93 MB / 462.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.063e-05/0.1344, allocations: 179.2 kB / 0.6559 GB, free: 12.75 MB / 462.1 MB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0002187/0.1346, allocations: 405.2 kB / 0.6563 GB, free: 12.3 MB / 462.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.207e-05/0.1346, allocations: 104.9 kB / 0.6564 GB, free: 12.19 MB / 462.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 4.585e-05/0.1347, allocations: 109 kB / 0.6565 GB, free: 12.08 MB / 462.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 5.939e-05/0.1347, allocations: 181.8 kB / 0.6567 GB, free: 11.89 MB / 462.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 6.935e-05/0.1348, allocations: 180.3 kB / 0.6569 GB, free: 11.71 MB / 462.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 6.364e-05/0.1349, allocations: 184.7 kB / 0.657 GB, free: 11.52 MB / 462.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 7.171e-05/0.135, allocations: 178 kB / 0.6572 GB, free: 11.34 MB / 462.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0001284/0.1351, allocations: 308.8 kB / 0.6575 GB, free: 11.02 MB / 462.1 MB Notification: Performance of postOpt removeConstants (simulation): time 7.481e-05/0.1352, allocations: 178.1 kB / 0.6577 GB, free: 10.82 MB / 462.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 7.777e-05/0.1353, allocations: 192.2 kB / 0.6579 GB, free: 10.62 MB / 462.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 7.383e-05/0.1353, allocations: 105 kB / 0.658 GB, free: 10.52 MB / 462.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 7.519e-05/0.1354, allocations: 188.2 kB / 0.6581 GB, free: 10.32 MB / 462.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 3.575e-05/0.1355, allocations: 105 kB / 0.6582 GB, free: 10.21 MB / 462.1 MB Notification: Performance of sorting global known variables: time 4.598e-05/0.1355, allocations: 79.22 kB / 0.6583 GB, free: 10.14 MB / 462.1 MB Notification: Performance of sort global known variables: time 1.2e-07/0.1355, allocations: 4 kB / 0.6583 GB, free: 10.13 MB / 462.1 MB Notification: Performance of remove unused functions: time 0.00024/0.1358, allocations: 0 / 0.6583 GB, free: 10.13 MB / 462.1 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * 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 (0): * Single equations (assignments): 0 * 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 Backend phase and start with SimCode phase: time 0.0002098/0.136, allocations: 189.3 kB / 0.6585 GB, free: 9.938 MB / 462.1 MB Notification: Performance of simCode: created initialization part: time 4.116e-05/0.136, allocations: 4 kB / 0.6585 GB, free: 9.934 MB / 462.1 MB Notification: Performance of simCode: created event and clocks part: time 1.974e-06/0.136, allocations: 0 / 0.6585 GB, free: 9.934 MB / 462.1 MB Notification: Performance of simCode: created simulation system equations: time 4.048e-06/0.1361, allocations: 3.938 kB / 0.6585 GB, free: 9.93 MB / 462.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0002985/0.1364, allocations: 0.5263 MB / 0.659 GB, free: 9.398 MB / 462.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.0002267/0.1366, allocations: 163.9 kB / 0.6592 GB, free: 9.211 MB / 462.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000261/0.1369, allocations: 0.677 MB / 0.6598 GB, free: 8.508 MB / 462.1 MB Notification: Performance of simCode: alias equations: time 1.518e-05/0.1369, allocations: 0 / 0.6598 GB, free: 8.508 MB / 462.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 2.055e-05/0.1369, allocations: 11.42 kB / 0.6598 GB, free: 8.496 MB / 462.1 MB Notification: Performance of SimCode: time 3.41e-07/0.1369, allocations: 0 / 0.6598 GB, free: 8.496 MB / 462.1 MB Notification: Performance of Templates: time 0.00214/0.1391, allocations: 323.6 kB / 0.6602 GB, free: 8.211 MB / 462.1 MB make -j1 -f BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.makefile Environment - environmentSimulation: (rm -f BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.pipe ; mkfifo BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.pipe ; head -c 1048576 < BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.pipe >> ../files/BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.sim & ./BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader -abortSlowSimulation -alarm=480 -lv LOG_STATS > BuildingSystems_BuildingSystems.BoundaryConditions.WeatherData.BaseClasses.Examples.GetTimeSpanTMY3LongHeader.pipe 2>&1) Environment - environmentSimulation: