Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo): time 0.001181/0.001181, allocations: 72.95 kB / 20.72 MB, free: 3.766 MB / 18.57 MB " [Timeout remaining time 180] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+maint.om/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+maint.om/package.mo): time 0.0013/0.0013, allocations: 169 kB / 24.14 MB, free: 348 kB / 18.57 MB " [Timeout remaining time 180] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0+maint.om/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0+maint.om/package.mo): time 1.001/1.001, allocations: 177.1 MB / 204.6 MB, free: 5.441 MB / 186.7 MB " [Timeout remaining time 179] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA master/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA master/package.mo): time 0.6388/0.6388, allocations: 115 MB / 376 MB, free: 7.484 MB / 346.7 MB " [Timeout remaining time 179] Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA master/package.mo) Using package Modelica with version 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0+maint.om/package.mo) Using package Complex with version 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+maint.om/package.mo) Using package ModelicaServices with version 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo) Running command: translateModel(IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier") translateModel(IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier") [Timeout 660] "Notification: Performance of FrontEnd - loaded program: time 1.342e-06/1.342e-06, allocations: 0 / 428.8 MB, free: 2.734 MB / 394.7 MB Notification: Performance of FrontEnd - Absyn->SCode: time 2.535e-05/2.669e-05, allocations: 6.25 kB / 428.8 MB, free: 2.727 MB / 394.7 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier): time 0.3831/0.3831, allocations: 159.9 MB / 0.5749 GB, free: 5.727 MB / 0.5105 GB Notification: Performance of NFInst.instExpressions: time 0.01776/0.4009, allocations: 7.302 MB / 0.582 GB, free: 14.44 MB / 0.5261 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00389/0.4048, allocations: 107.1 kB / 0.5821 GB, free: 14.33 MB / 0.5261 GB Notification: Performance of NFTyping.typeComponents: time 0.002145/0.4069, allocations: 0.4884 MB / 0.5826 GB, free: 13.84 MB / 0.5261 GB Notification: Performance of NFTyping.typeBindings: time 0.006851/0.4138, allocations: 1.994 MB / 0.5846 GB, free: 11.84 MB / 0.5261 GB Notification: Performance of NFTyping.typeClassSections: time 0.008889/0.4227, allocations: 1.864 MB / 0.5864 GB, free: 9.977 MB / 0.5261 GB Notification: Performance of NFFlatten.flatten: time 0.009013/0.4317, allocations: 4.98 MB / 0.5912 GB, free: 4.988 MB / 0.5261 GB Notification: Performance of NFFlatten.resolveConnections: time 0.00309/0.4348, allocations: 1.644 MB / 0.5928 GB, free: 3.391 MB / 0.5261 GB Notification: Performance of NFEvalConstants.evaluate: time 0.004255/0.439, allocations: 2.79 MB / 0.5956 GB, free: 0.6875 MB / 0.5261 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001695/0.4407, allocations: 1.345 MB / 0.5969 GB, free: 15.34 MB / 0.5417 GB Notification: Performance of NFPackage.collectConstants: time 0.0002118/0.4409, allocations: 196 kB / 0.5971 GB, free: 15.14 MB / 0.5417 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001319/0.4422, allocations: 0.7679 MB / 0.5978 GB, free: 14.38 MB / 0.5417 GB Notification: Performance of NFScalarize.scalarize: time 0.0005349/0.4428, allocations: 0.8101 MB / 0.5986 GB, free: 13.57 MB / 0.5417 GB Notification: Performance of NFVerifyModel.verify: time 0.0007217/0.4435, allocations: 0.8185 MB / 0.5994 GB, free: 12.75 MB / 0.5417 GB Notification: Performance of NFConvertDAE.convert: time 0.005751/0.4492, allocations: 2.095 MB / 0.6015 GB, free: 10.64 MB / 0.5417 GB Notification: Performance of FrontEnd - DAE generated: time 1.019e-05/0.4493, allocations: 0 / 0.6015 GB, free: 10.64 MB / 0.5417 GB Notification: Performance of FrontEnd: time 3.647e-06/0.4493, allocations: 3.984 kB / 0.6015 GB, free: 10.64 MB / 0.5417 GB Notification: Performance of Transformations before backend: time 0.0001129/0.4494, allocations: 4 kB / 0.6015 GB, free: 10.64 MB / 0.5417 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 324 * Number of variables: 324 Notification: Performance of Generate backend data structure: time 0.005258/0.4546, allocations: 2.328 MB / 0.6037 GB, free: 8.266 MB / 0.5417 GB Notification: Performance of prepare preOptimizeDAE: time 4.757e-05/0.4547, allocations: 8.031 kB / 0.6037 GB, free: 8.258 MB / 0.5417 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003443/0.4581, allocations: 0.5924 MB / 0.6043 GB, free: 7.664 MB / 0.5417 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.003063/0.4612, allocations: 1.136 MB / 0.6054 GB, free: 6.477 MB / 0.5417 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001138/0.4613, allocations: 114.5 kB / 0.6055 GB, free: 6.363 MB / 0.5417 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002706/0.4616, allocations: 163.9 kB / 0.6057 GB, free: 6.203 MB / 0.5417 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002157/0.4637, allocations: 1.404 MB / 0.6071 GB, free: 4.645 MB / 0.5417 GB Notification: Performance of preOpt findStateOrder (simulation): time 4.178e-05/0.4638, allocations: 1.031 kB / 0.6071 GB, free: 4.645 MB / 0.5417 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001348/0.4639, allocations: 64 kB / 0.6071 GB, free: 4.582 MB / 0.5417 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 8.233e-05/0.464, allocations: 50.44 kB / 0.6072 GB, free: 4.531 MB / 0.5417 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001088/0.4651, allocations: 438.8 kB / 0.6076 GB, free: 4.086 MB / 0.5417 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 0.007628/0.4727, allocations: 3.398 MB / 0.6109 GB, free: 0.6094 MB / 0.5417 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0008391/0.4735, allocations: 398.1 kB / 0.6113 GB, free: 220 kB / 0.5417 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003041/0.4738, allocations: 165.3 kB / 0.6114 GB, free: 52 kB / 0.5417 GB Notification: Performance of preOpt evalFunc (simulation): time 0.000164/0.474, allocations: 32.58 kB / 0.6115 GB, free: 20 kB / 0.5417 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 7.517e-05/0.4741, allocations: 43.22 kB / 0.6115 GB, free: 15.97 MB / 0.5573 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.00117/0.4753, allocations: 224.9 kB / 0.6117 GB, free: 15.75 MB / 0.5573 GB Notification: Performance of pre-optimization done (n=67): time 6.833e-06/0.4753, allocations: 0 / 0.6117 GB, free: 15.75 MB / 0.5573 GB Notification: Performance of matching and sorting (n=67): time 0.001305/0.4766, allocations: 493.7 kB / 0.6122 GB, free: 15.26 MB / 0.5573 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.421e-05/0.4766, allocations: 68.05 kB / 0.6123 GB, free: 15.18 MB / 0.5573 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001354/0.478, allocations: 1.099 MB / 0.6133 GB, free: 14.07 MB / 0.5573 GB Notification: Performance of collectPreVariables (initialization): time 8.692e-05/0.478, allocations: 49.7 kB / 0.6134 GB, free: 14.02 MB / 0.5573 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005255/0.4786, allocations: 0.6563 MB / 0.614 GB, free: 13.35 MB / 0.5573 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002549/0.4788, allocations: 257.8 kB / 0.6143 GB, free: 13.1 MB / 0.5573 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003956/0.4792, allocations: 262.6 kB / 0.6145 GB, free: 12.83 MB / 0.5573 GB Notification: Performance of setup shared object (initialization): time 0.0001471/0.4794, allocations: 357.8 kB / 0.6149 GB, free: 12.48 MB / 0.5573 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0003375/0.4797, allocations: 140.9 kB / 0.615 GB, free: 12.34 MB / 0.5573 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.000883/0.4806, allocations: 1.08 MB / 0.6161 GB, free: 10.91 MB / 0.5573 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001233/0.4818, allocations: 0.8755 MB / 0.6169 GB, free: 9.824 MB / 0.5573 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.258e-05/0.4818, allocations: 8 kB / 0.6169 GB, free: 9.816 MB / 0.5573 GB Notification: Performance of matching and sorting (n=157) (initialization): time 0.001588/0.4834, allocations: 0.796 MB / 0.6177 GB, free: 9.012 MB / 0.5573 GB Notification: Performance of prepare postOptimizeDAE: time 3.427e-05/0.4835, allocations: 12 kB / 0.6177 GB, free: 9 MB / 0.5573 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.856e-05/0.4835, allocations: 16.91 kB / 0.6177 GB, free: 8.984 MB / 0.5573 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.881e-05/0.4835, allocations: 24 kB / 0.6178 GB, free: 8.961 MB / 0.5573 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001176/0.4847, allocations: 303.4 kB / 0.618 GB, free: 8.664 MB / 0.5573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 3.204e-05/0.4847, allocations: 31.92 kB / 0.6181 GB, free: 8.633 MB / 0.5573 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001452/0.4862, allocations: 51.69 kB / 0.6181 GB, free: 8.582 MB / 0.5573 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001232/0.4863, allocations: 55.97 kB / 0.6182 GB, free: 8.527 MB / 0.5573 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0007381/0.487, allocations: 240.3 kB / 0.6184 GB, free: 8.285 MB / 0.5573 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0008963/0.4879, allocations: 1.084 MB / 0.6195 GB, free: 6.855 MB / 0.5573 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.001207/0.4891, allocations: 0.8651 MB / 0.6203 GB, free: 5.777 MB / 0.5573 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 1.162e-05/0.4892, allocations: 4 kB / 0.6203 GB, free: 5.773 MB / 0.5573 GB Notification: Performance of matching and sorting (n=157) (initialization_lambda0): time 0.001567/0.4907, allocations: 0.7923 MB / 0.6211 GB, free: 4.969 MB / 0.5573 GB Notification: Performance of prepare postOptimizeDAE: time 2.951e-05/0.4908, allocations: 14.5 kB / 0.6211 GB, free: 4.957 MB / 0.5573 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.548e-05/0.4908, allocations: 16.84 kB / 0.6211 GB, free: 4.941 MB / 0.5573 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.528e-05/0.4908, allocations: 20 kB / 0.6211 GB, free: 4.922 MB / 0.5573 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001096/0.4919, allocations: 307.4 kB / 0.6214 GB, free: 4.621 MB / 0.5573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 2.908e-05/0.4919, allocations: 27.92 kB / 0.6215 GB, free: 4.594 MB / 0.5573 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001402/0.4933, allocations: 67.75 kB / 0.6215 GB, free: 4.527 MB / 0.5573 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001101/0.4934, allocations: 54.23 kB / 0.6216 GB, free: 4.477 MB / 0.5573 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 68 * 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 (155): * Single equations (assignments): 153 * Array equations: 2 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.0004429/0.4939, allocations: 267.8 kB / 0.6218 GB, free: 4.207 MB / 0.5573 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002683/0.4942, allocations: 111.8 kB / 0.6219 GB, free: 4.098 MB / 0.5573 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00113/0.4953, allocations: 0.4888 MB / 0.6224 GB, free: 3.594 MB / 0.5573 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.698e-06/0.4953, allocations: 8 kB / 0.6224 GB, free: 3.586 MB / 0.5573 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.518e-06/0.4953, allocations: 0.5625 kB / 0.6224 GB, free: 3.586 MB / 0.5573 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0005742/0.4959, allocations: 441.2 kB / 0.6228 GB, free: 3.105 MB / 0.5573 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002905/0.4988, allocations: 1.285 MB / 0.6241 GB, free: 1.762 MB / 0.5573 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 8.496e-06/0.4988, allocations: 4.625 kB / 0.6241 GB, free: 1.758 MB / 0.5573 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001114/0.4999, allocations: 224.6 kB / 0.6243 GB, free: 1.535 MB / 0.5573 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.084e-05/0.4999, allocations: 4 kB / 0.6243 GB, free: 1.531 MB / 0.5573 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 7.497e-05/0.5, allocations: 19.98 kB / 0.6243 GB, free: 1.512 MB / 0.5573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 9.437e-06/0.5, allocations: 5 kB / 0.6243 GB, free: 1.508 MB / 0.5573 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.777e-06/0.5, allocations: 0 / 0.6243 GB, free: 1.508 MB / 0.5573 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001246/0.5012, allocations: 0.7355 MB / 0.6251 GB, free: 0.7305 MB / 0.5573 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0006706/0.5019, allocations: 182.9 kB / 0.6252 GB, free: 0.5508 MB / 0.5573 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002726/0.5022, allocations: 20 kB / 0.6252 GB, free: 0.5312 MB / 0.5573 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0005221/0.5027, allocations: 27.92 kB / 0.6253 GB, free: 0.5039 MB / 0.5573 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 7.416e-05/0.5028, allocations: 49 kB / 0.6253 GB, free: 472 kB / 0.5573 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 5.553e-05/0.5028, allocations: 31.97 kB / 0.6254 GB, free: 440 kB / 0.5573 GB Notification: Performance of sorting global known variables: time 0.0005028/0.5033, allocations: 0.5312 MB / 0.6259 GB, free: 15.89 MB / 0.573 GB Notification: Performance of sort global known variables: time 8e-08/0.5033, allocations: 0 / 0.6259 GB, free: 15.89 MB / 0.573 GB Notification: Performance of remove unused functions: time 0.001771/0.5051, allocations: 0.9277 MB / 0.6268 GB, free: 14.97 MB / 0.573 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 7 * Number of states: 6 (humBac.vol.dynBal.medium.Xi[1],humBac.vol.dynBal.U,humBac.vol.dynBal.m,humFor.vol.dynBal.medium.Xi[1],humFor.vol.dynBal.U,humFor.vol.dynBal.m) * 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 (71): * Single equations (assignments): 71 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.0003086/0.5054, allocations: 149.1 kB / 0.6269 GB, free: 14.82 MB / 0.573 GB Notification: Performance of simCode: created initialization part: time 0.001065/0.5065, allocations: 0.9182 MB / 0.6278 GB, free: 13.91 MB / 0.573 GB Notification: Performance of simCode: created event and clocks part: time 1.98e-05/0.5065, allocations: 16.5 kB / 0.6278 GB, free: 13.89 MB / 0.573 GB Notification: Performance of simCode: created simulation system equations: time 0.0001791/0.5067, allocations: 186.7 kB / 0.628 GB, free: 13.71 MB / 0.573 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001688/0.5084, allocations: 0.7825 MB / 0.6288 GB, free: 12.99 MB / 0.573 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002989/0.5114, allocations: 2.625 MB / 0.6313 GB, free: 10.3 MB / 0.573 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0002506/0.5116, allocations: 343.7 kB / 0.6317 GB, free: 9.949 MB / 0.573 GB Notification: Performance of simCode: alias equations: time 0.000794/0.5124, allocations: 283.5 kB / 0.6319 GB, free: 9.688 MB / 0.573 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001107/0.5135, allocations: 0.5711 MB / 0.6325 GB, free: 9.109 MB / 0.573 GB Notification: Performance of SimCode: time 1.122e-06/0.5135, allocations: 0 / 0.6325 GB, free: 9.109 MB / 0.573 GB Notification: Performance of Templates: time 0.2883/0.8018, allocations: 30.53 MB / 0.6623 GB, free: 80.77 MB / 0.5886 GB " [Timeout remaining time 659] make -j1 -f IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.makefile [Timeout 660] (rm -f IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.sim & ./IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier -abortSlowSimulation -alarm=240 -s gbode -gbm=radauIIA3 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowHumidifier.pipe 2>&1) [Timeout 240] [Calling sys.exit(0), Time elapsed: 4.65296614728868]