Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.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 0.001066/0.001066, allocations: 80.22 kB / 20.94 MB, free: 3.609 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 0.001174/0.001174, allocations: 169 kB / 24.25 MB, free: 308 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 1.029/1.029, allocations: 177.2 MB / 204.6 MB, free: 5.633 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 0.5985/0.5985, allocations: 115 MB / 376 MB, free: 7.664 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.HeatPumps.Validation.Carnot_y_etaCar,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar") translateModel(IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar") [Timeout 660] "Notification: Performance of FrontEnd - loaded program: time 1.973e-06/1.973e-06, allocations: 0 / 481.5 MB, free: 11.81 MB / 410.7 MB Notification: Performance of FrontEnd - Absyn->SCode: time 3.276e-05/3.474e-05, allocations: 5.703 kB / 481.5 MB, free: 11.8 MB / 410.7 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar): time 0.06128/0.06132, allocations: 78.73 MB / 0.5471 GB, free: 9.539 MB / 474.7 MB Notification: Performance of NFInst.instExpressions: time 0.01809/0.07941, allocations: 16.59 MB / 0.5633 GB, free: 8.902 MB / 490.7 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.002418/0.08182, allocations: 99.19 kB / 0.5634 GB, free: 8.805 MB / 490.7 MB Notification: Performance of NFTyping.typeComponents: time 0.002249/0.08407, allocations: 0.8419 MB / 0.5643 GB, free: 7.957 MB / 490.7 MB Notification: Performance of NFTyping.typeBindings: time 0.006338/0.09041, allocations: 2.856 MB / 0.567 GB, free: 5.086 MB / 490.7 MB Notification: Performance of NFTyping.typeClassSections: time 0.003455/0.09387, allocations: 1.808 MB / 0.5688 GB, free: 3.273 MB / 490.7 MB Notification: Performance of NFFlatten.flatten: time 0.006252/0.1001, allocations: 4.604 MB / 0.5733 GB, free: 14.65 MB / 0.4948 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002077/0.1022, allocations: 1.166 MB / 0.5744 GB, free: 13.45 MB / 0.4948 GB Notification: Performance of NFEvalConstants.evaluate: time 0.005444/0.1076, allocations: 2.58 MB / 0.577 GB, free: 10.89 MB / 0.4948 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002007/0.1096, allocations: 1.087 MB / 0.578 GB, free: 9.797 MB / 0.4948 GB Notification: Performance of NFPackage.collectConstants: time 0.0003749/0.11, allocations: 164 kB / 0.5782 GB, free: 9.637 MB / 0.4948 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002371/0.1124, allocations: 1.173 MB / 0.5793 GB, free: 8.461 MB / 0.4948 GB Notification: Performance of NFScalarize.scalarize: time 0.0003801/0.1128, allocations: 438.2 kB / 0.5797 GB, free: 8.031 MB / 0.4948 GB Notification: Performance of NFVerifyModel.verify: time 0.001092/0.1139, allocations: 0.6391 MB / 0.5804 GB, free: 7.391 MB / 0.4948 GB Notification: Performance of NFConvertDAE.convert: time 0.003867/0.1177, allocations: 2.021 MB / 0.5823 GB, free: 5.363 MB / 0.4948 GB Notification: Performance of FrontEnd - DAE generated: time 5.631e-06/0.1177, allocations: 0 / 0.5823 GB, free: 5.363 MB / 0.4948 GB Notification: Performance of FrontEnd: time 1.192e-06/0.1177, allocations: 0 / 0.5823 GB, free: 5.363 MB / 0.4948 GB Notification: Performance of Transformations before backend: time 3.927e-05/0.1178, allocations: 0 / 0.5823 GB, free: 5.363 MB / 0.4948 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 240 * Number of variables: 240 Notification: Performance of Generate backend data structure: time 0.003072/0.1208, allocations: 2.219 MB / 0.5845 GB, free: 3.086 MB / 0.4948 GB Notification: Performance of prepare preOptimizeDAE: time 4.359e-05/0.1209, allocations: 8.031 kB / 0.5845 GB, free: 3.078 MB / 0.4948 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0006861/0.1216, allocations: 323.5 kB / 0.5848 GB, free: 2.762 MB / 0.4948 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002122/0.1237, allocations: 1.602 MB / 0.5864 GB, free: 1.113 MB / 0.4948 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.065e-05/0.1238, allocations: 81.94 kB / 0.5865 GB, free: 1.031 MB / 0.4948 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001199/0.1239, allocations: 112 kB / 0.5866 GB, free: 0.9219 MB / 0.4948 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001184/0.1251, allocations: 0.9282 MB / 0.5875 GB, free: 15.91 MB / 0.5105 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.465e-05/0.1251, allocations: 4 kB / 0.5875 GB, free: 15.91 MB / 0.5105 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.507e-05/0.1251, allocations: 36 kB / 0.5875 GB, free: 15.87 MB / 0.5105 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.715e-05/0.1252, allocations: 24 kB / 0.5875 GB, free: 15.85 MB / 0.5105 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0007017/0.1259, allocations: 387.5 kB / 0.5879 GB, free: 15.47 MB / 0.5105 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 0.003888/0.1298, allocations: 3.785 MB / 0.5916 GB, free: 11.61 MB / 0.5105 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0007016/0.1305, allocations: 355.5 kB / 0.5919 GB, free: 11.25 MB / 0.5105 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0002231/0.1307, allocations: 153.1 kB / 0.5921 GB, free: 11.1 MB / 0.5105 GB Notification: Performance of preOpt evalFunc (simulation): time 0.000231/0.1309, allocations: 92.38 kB / 0.5922 GB, free: 11 MB / 0.5105 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.369e-05/0.131, allocations: 45.89 kB / 0.5922 GB, free: 10.95 MB / 0.5105 GB Notification: Performance of pre-optimization done (n=61): time 2.715e-06/0.131, allocations: 0 / 0.5922 GB, free: 10.95 MB / 0.5105 GB Notification: Performance of matching and sorting (n=61): time 0.002653/0.1336, allocations: 0.9952 MB / 0.5932 GB, free: 9.949 MB / 0.5105 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.641e-05/0.1337, allocations: 59.91 kB / 0.5933 GB, free: 9.875 MB / 0.5105 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0009959/0.1347, allocations: 1.008 MB / 0.5942 GB, free: 8.859 MB / 0.5105 GB Notification: Performance of collectPreVariables (initialization): time 6.058e-05/0.1347, allocations: 45.7 kB / 0.5943 GB, free: 8.809 MB / 0.5105 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004281/0.1351, allocations: 0.7113 MB / 0.595 GB, free: 8.09 MB / 0.5105 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001668/0.1353, allocations: 222.1 kB / 0.5952 GB, free: 7.871 MB / 0.5105 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001868/0.1355, allocations: 192.2 kB / 0.5954 GB, free: 7.676 MB / 0.5105 GB Notification: Performance of setup shared object (initialization): time 0.000134/0.1356, allocations: 0.5043 MB / 0.5959 GB, free: 7.164 MB / 0.5105 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002157/0.1359, allocations: 119.6 kB / 0.596 GB, free: 7.043 MB / 0.5105 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0005772/0.1364, allocations: 0.9653 MB / 0.5969 GB, free: 5.793 MB / 0.5105 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0006359/0.1371, allocations: 0.6335 MB / 0.5975 GB, free: 5.012 MB / 0.5105 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.921e-06/0.1371, allocations: 0 / 0.5975 GB, free: 5.012 MB / 0.5105 GB Notification: Performance of matching and sorting (n=104) (initialization): time 0.001876/0.1389, allocations: 0.9256 MB / 0.5984 GB, free: 4.074 MB / 0.5105 GB Notification: Performance of prepare postOptimizeDAE: time 2.351e-05/0.139, allocations: 12.03 kB / 0.5985 GB, free: 4.062 MB / 0.5105 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.4e-05/0.139, allocations: 11.94 kB / 0.5985 GB, free: 4.051 MB / 0.5105 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001306/0.1403, allocations: 371.3 kB / 0.5988 GB, free: 3.684 MB / 0.5105 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003887/0.1407, allocations: 175.7 kB / 0.599 GB, free: 3.512 MB / 0.5105 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0005351/0.1412, allocations: 0.9163 MB / 0.5999 GB, free: 2.566 MB / 0.5105 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.000596/0.1418, allocations: 95.38 kB / 0.6 GB, free: 2.473 MB / 0.5105 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.34e-05/0.1419, allocations: 44.08 kB / 0.6 GB, free: 2.43 MB / 0.5105 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.00045/0.1423, allocations: 256.8 kB / 0.6003 GB, free: 2.172 MB / 0.5105 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0005581/0.1429, allocations: 0.9614 MB / 0.6012 GB, free: 0.9219 MB / 0.5105 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0006399/0.1435, allocations: 0.6296 MB / 0.6018 GB, free: 140 kB / 0.5105 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.881e-06/0.1435, allocations: 4 kB / 0.6018 GB, free: 136 kB / 0.5105 GB Notification: Performance of matching and sorting (n=104) (initialization_lambda0): time 0.001857/0.1454, allocations: 0.9215 MB / 0.6027 GB, free: 15.2 MB / 0.5261 GB Notification: Performance of prepare postOptimizeDAE: time 1.777e-05/0.1454, allocations: 14.48 kB / 0.6027 GB, free: 15.18 MB / 0.5261 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.087e-06/0.1454, allocations: 8.375 kB / 0.6027 GB, free: 15.18 MB / 0.5261 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001183/0.1466, allocations: 367.3 kB / 0.6031 GB, free: 14.81 MB / 0.5261 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003626/0.147, allocations: 179.7 kB / 0.6033 GB, free: 14.64 MB / 0.5261 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0004671/0.1474, allocations: 0.9091 MB / 0.6041 GB, free: 13.7 MB / 0.5261 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0006017/0.148, allocations: 87.58 kB / 0.6042 GB, free: 13.61 MB / 0.5261 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.118e-05/0.1481, allocations: 43.98 kB / 0.6043 GB, free: 13.57 MB / 0.5261 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 36 * 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 (94): * Single equations (assignments): 93 * 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 {(1,10)} Notification: Performance of prepare postOptimizeDAE: time 0.0002347/0.1483, allocations: 319.8 kB / 0.6046 GB, free: 13.25 MB / 0.5261 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001992/0.1485, allocations: 151.1 kB / 0.6047 GB, free: 13.1 MB / 0.5261 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001648/0.1502, allocations: 0.8319 MB / 0.6055 GB, free: 12.25 MB / 0.5261 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.495e-05/0.1502, allocations: 11.98 kB / 0.6055 GB, free: 12.23 MB / 0.5261 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.889e-06/0.1502, allocations: 0 / 0.6055 GB, free: 12.23 MB / 0.5261 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001254/0.1514, allocations: 0.6517 MB / 0.6062 GB, free: 11.55 MB / 0.5261 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002889/0.1543, allocations: 1.873 MB / 0.608 GB, free: 9.586 MB / 0.5261 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.683e-06/0.1543, allocations: 4 kB / 0.608 GB, free: 9.582 MB / 0.5261 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002522/0.1546, allocations: 107.8 kB / 0.6081 GB, free: 9.477 MB / 0.5261 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001162/0.1557, allocations: 347.7 kB / 0.6084 GB, free: 9.133 MB / 0.5261 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 3.951e-05/0.1558, allocations: 23.98 kB / 0.6085 GB, free: 9.109 MB / 0.5261 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002207/0.158, allocations: 2.551 MB / 0.611 GB, free: 6.441 MB / 0.5261 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.078e-05/0.158, allocations: 7.938 kB / 0.611 GB, free: 6.434 MB / 0.5261 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002126/0.1601, allocations: 1.108 MB / 0.6121 GB, free: 5.246 MB / 0.5261 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005043/0.1606, allocations: 234.8 kB / 0.6123 GB, free: 5.016 MB / 0.5261 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000127/0.1608, allocations: 16 kB / 0.6123 GB, free: 5 MB / 0.5261 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0003597/0.1611, allocations: 32 kB / 0.6123 GB, free: 4.969 MB / 0.5261 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001158/0.1612, allocations: 68.27 kB / 0.6124 GB, free: 4.902 MB / 0.5261 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.823e-05/0.1613, allocations: 31.98 kB / 0.6124 GB, free: 4.871 MB / 0.5261 GB Notification: Performance of sorting global known variables: time 0.0007054/0.162, allocations: 0.629 MB / 0.613 GB, free: 4.238 MB / 0.5261 GB Notification: Performance of sort global known variables: time 2.61e-07/0.162, allocations: 0 / 0.613 GB, free: 4.238 MB / 0.5261 GB Notification: Performance of remove unused functions: time 0.001755/0.1637, allocations: 0.7755 MB / 0.6138 GB, free: 3.461 MB / 0.5261 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 15 * Number of states: 2 (heaPum.con.vol.dynBal.U,heaPum.eva.vol.dynBal.U) * 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 (55): * Single equations (assignments): 50 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 4 * 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 {(1,10)} Notification: Performance of Backend phase and start with SimCode phase: time 0.0007139/0.1645, allocations: 457.4 kB / 0.6142 GB, free: 3.008 MB / 0.5261 GB Notification: Performance of simCode: created initialization part: time 0.001435/0.1659, allocations: 0.7193 MB / 0.6149 GB, free: 2.285 MB / 0.5261 GB Notification: Performance of simCode: created event and clocks part: time 4.519e-06/0.1659, allocations: 4 kB / 0.6149 GB, free: 2.281 MB / 0.5261 GB Notification: Performance of simCode: created simulation system equations: time 0.00063/0.1665, allocations: 451.8 kB / 0.6154 GB, free: 1.82 MB / 0.5261 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001817/0.1683, allocations: 0.6282 MB / 0.616 GB, free: 1.223 MB / 0.5261 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003354/0.1717, allocations: 2.175 MB / 0.6181 GB, free: 14.94 MB / 0.5417 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0002091/0.1719, allocations: 261.2 kB / 0.6183 GB, free: 14.66 MB / 0.5417 GB Notification: Performance of simCode: alias equations: time 0.0008231/0.1727, allocations: 271.5 kB / 0.6186 GB, free: 14.4 MB / 0.5417 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001843/0.1729, allocations: 104.4 kB / 0.6187 GB, free: 14.3 MB / 0.5417 GB Notification: Performance of SimCode: time 2.594e-06/0.1729, allocations: 0 / 0.6187 GB, free: 14.3 MB / 0.5417 GB Notification: Performance of Templates: time 0.03499/0.2079, allocations: 28.67 MB / 0.6467 GB, free: 2.211 MB / 0.5573 GB " [Timeout remaining time 660] make -j1 -f IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.makefile [Timeout 660] (rm -f IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.sim & ./IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar -abortSlowSimulation -alarm=240 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.Carnot_y_etaCar.pipe 2>&1) [Timeout 240] [Calling sys.exit(0), Time elapsed: 4.542555073974654]