Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.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 0.0008899/0.0008899, allocations: 73.88 kB / 20.65 MB, free: 3.848 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 0.0009542/0.0009542, allocations: 173 kB / 24.06 MB, free: 456 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 0.8802/0.8802, allocations: 177.1 MB / 204.5 MB, free: 5.516 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 0.5592/0.5592, allocations: 115 MB / 376 MB, free: 7.523 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.HeatExchangers.Examples.AirHeater_T,tolerance=1e-08,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T") translateModel(IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T,tolerance=1e-08,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T") [Timeout 660] "Notification: Performance of FrontEnd - loaded program: time 1.623e-06/1.623e-06, allocations: 0 / 482 MB, free: 11.71 MB / 410.7 MB Notification: Performance of FrontEnd - Absyn->SCode: time 1.523e-05/1.685e-05, allocations: 4.672 kB / 482 MB, free: 11.71 MB / 410.7 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T): time 0.1272/0.1272, allocations: 154.8 MB / 0.6218 GB, free: 12.57 MB / 0.5417 GB Notification: Performance of NFInst.instExpressions: time 0.01488/0.1421, allocations: 10.95 MB / 0.6325 GB, free: 1.609 MB / 0.5417 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002291/0.1443, allocations: 130.9 kB / 0.6327 GB, free: 1.48 MB / 0.5417 GB Notification: Performance of NFTyping.typeComponents: time 0.00343/0.1478, allocations: 1.672 MB / 0.6343 GB, free: 15.8 MB / 0.5573 GB Notification: Performance of NFTyping.typeBindings: time 0.00434/0.1521, allocations: 2.487 MB / 0.6367 GB, free: 13.3 MB / 0.5573 GB Notification: Performance of NFTyping.typeClassSections: time 0.0046/0.1567, allocations: 2.607 MB / 0.6393 GB, free: 10.69 MB / 0.5573 GB Notification: Performance of NFFlatten.flatten: time 0.009385/0.1661, allocations: 8.789 MB / 0.6478 GB, free: 1.871 MB / 0.5573 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002272/0.1684, allocations: 1.561 MB / 0.6494 GB, free: 276 kB / 0.5573 GB Notification: Performance of NFEvalConstants.evaluate: time 0.2342/0.4026, allocations: 3.206 MB / 0.6525 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002845/0.4054, allocations: 1.426 MB / 0.6539 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFPackage.collectConstants: time 0.0006064/0.406, allocations: 199.5 kB / 0.6541 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002438/0.4085, allocations: 1.26 MB / 0.6553 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFScalarize.scalarize: time 0.0008303/0.4093, allocations: 0.9454 MB / 0.6562 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFVerifyModel.verify: time 0.001482/0.4108, allocations: 0.9006 MB / 0.6571 GB, free: 19.37 MB / 0.5573 GB Notification: Performance of NFConvertDAE.convert: time 0.003739/0.4145, allocations: 2.727 MB / 0.6598 GB, free: 19.19 MB / 0.5573 GB Notification: Performance of FrontEnd - DAE generated: time 5.16e-06/0.4145, allocations: 0 / 0.6598 GB, free: 19.19 MB / 0.5573 GB Notification: Performance of FrontEnd: time 1.122e-06/0.4145, allocations: 0 / 0.6598 GB, free: 19.19 MB / 0.5573 GB Notification: Performance of Transformations before backend: time 6.818e-05/0.4146, allocations: 1.844 kB / 0.6598 GB, free: 19.19 MB / 0.5573 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 334 * Number of variables: 334 Notification: Performance of Generate backend data structure: time 0.003808/0.4184, allocations: 3.298 MB / 0.663 GB, free: 17.48 MB / 0.5573 GB Notification: Performance of prepare preOptimizeDAE: time 3.894e-05/0.4184, allocations: 11.34 kB / 0.663 GB, free: 17.48 MB / 0.5573 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004762/0.4232, allocations: 1.286 MB / 0.6643 GB, free: 17.28 MB / 0.5573 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.003066/0.4263, allocations: 2.462 MB / 0.6667 GB, free: 16.65 MB / 0.5573 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.723e-05/0.4263, allocations: 112.1 kB / 0.6668 GB, free: 16.65 MB / 0.5573 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001934/0.4265, allocations: 149.7 kB / 0.6669 GB, free: 16.65 MB / 0.5573 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001794/0.4283, allocations: 1.441 MB / 0.6683 GB, free: 16.14 MB / 0.5573 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.706e-05/0.4283, allocations: 4.875 kB / 0.6683 GB, free: 16.14 MB / 0.5573 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 9.267e-05/0.4284, allocations: 60.53 kB / 0.6684 GB, free: 16.14 MB / 0.5573 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 6.485e-05/0.4285, allocations: 45.52 kB / 0.6684 GB, free: 16.13 MB / 0.5573 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0008743/0.4294, allocations: 0.5866 MB / 0.669 GB, free: 16.09 MB / 0.5573 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 0.00847/0.4378, allocations: 6.98 MB / 0.6758 GB, free: 12.71 MB / 0.5573 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001176/0.439, allocations: 0.6678 MB / 0.6765 GB, free: 12.68 MB / 0.5573 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003635/0.4394, allocations: 273.1 kB / 0.6767 GB, free: 12.67 MB / 0.5573 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002183/0.4396, allocations: 73.06 kB / 0.6768 GB, free: 12.66 MB / 0.5573 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0004958/0.4401, allocations: 0.521 MB / 0.6773 GB, free: 12.41 MB / 0.5573 GB Notification: Performance of pre-optimization done (n=80): time 2.365e-06/0.4401, allocations: 0 / 0.6773 GB, free: 12.41 MB / 0.5573 GB Notification: Performance of matching and sorting (n=80): time 0.001798/0.4419, allocations: 0.9914 MB / 0.6783 GB, free: 12.22 MB / 0.5573 GB Notification: Performance of inlineWhenForInitialization (initialization): time 2.196e-05/0.4419, allocations: 61.19 kB / 0.6783 GB, free: 12.16 MB / 0.5573 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001795/0.4437, allocations: 1.893 MB / 0.6802 GB, free: 11.83 MB / 0.5573 GB Notification: Performance of collectPreVariables (initialization): time 9.197e-05/0.4438, allocations: 53.73 kB / 0.6802 GB, free: 11.8 MB / 0.5573 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006943/0.4445, allocations: 1.26 MB / 0.6815 GB, free: 11.4 MB / 0.5573 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001916/0.4447, allocations: 303.1 kB / 0.6818 GB, free: 11.21 MB / 0.5573 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0002805/0.445, allocations: 250.5 kB / 0.682 GB, free: 11.17 MB / 0.5573 GB Notification: Performance of setup shared object (initialization): time 7.411e-05/0.445, allocations: 0.5308 MB / 0.6825 GB, free: 10.69 MB / 0.5573 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0003373/0.4454, allocations: 228.5 kB / 0.6827 GB, free: 10.64 MB / 0.5573 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0008207/0.4462, allocations: 1.076 MB / 0.6838 GB, free: 25.55 MB / 0.573 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0008245/0.447, allocations: 1.001 MB / 0.6848 GB, free: 24.83 MB / 0.573 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.009e-05/0.447, allocations: 4.938 kB / 0.6848 GB, free: 24.83 MB / 0.573 GB Notification: Performance of matching and sorting (n=147) (initialization): time 0.001387/0.4484, allocations: 1.141 MB / 0.6859 GB, free: 24.58 MB / 0.573 GB Notification: Performance of prepare postOptimizeDAE: time 3.372e-05/0.4485, allocations: 41.2 kB / 0.6859 GB, free: 24.55 MB / 0.573 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.463e-05/0.4485, allocations: 14.38 kB / 0.6859 GB, free: 24.55 MB / 0.573 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.047e-05/0.4485, allocations: 17.94 kB / 0.686 GB, free: 24.55 MB / 0.573 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007582/0.4493, allocations: 335.5 kB / 0.6863 GB, free: 24.55 MB / 0.573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.625e-05/0.4493, allocations: 28.72 kB / 0.6863 GB, free: 24.55 MB / 0.573 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001006/0.4503, allocations: 205.5 kB / 0.6865 GB, free: 24.48 MB / 0.573 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.596e-05/0.4504, allocations: 59.48 kB / 0.6866 GB, free: 24.48 MB / 0.573 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0005706/0.4509, allocations: 370.9 kB / 0.6869 GB, free: 24.32 MB / 0.573 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0004475/0.4514, allocations: 1.073 MB / 0.688 GB, free: 23.23 MB / 0.573 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0006741/0.452, allocations: 0.9971 MB / 0.6889 GB, free: 22.5 MB / 0.573 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 6.883e-06/0.4521, allocations: 2.812 kB / 0.6889 GB, free: 22.5 MB / 0.573 GB Notification: Performance of matching and sorting (n=147) (initialization_lambda0): time 0.001187/0.4532, allocations: 1.149 MB / 0.6901 GB, free: 22.25 MB / 0.573 GB Notification: Performance of prepare postOptimizeDAE: time 2.391e-05/0.4533, allocations: 39.5 kB / 0.6901 GB, free: 22.22 MB / 0.573 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.197e-06/0.4533, allocations: 13.28 kB / 0.6901 GB, free: 22.22 MB / 0.573 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.163e-05/0.4533, allocations: 20 kB / 0.6901 GB, free: 22.22 MB / 0.573 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000706/0.454, allocations: 335.4 kB / 0.6904 GB, free: 22.22 MB / 0.573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.456e-05/0.454, allocations: 27.33 kB / 0.6905 GB, free: 22.22 MB / 0.573 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0008801/0.4549, allocations: 187.7 kB / 0.6906 GB, free: 22.18 MB / 0.573 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.718e-05/0.455, allocations: 58.41 kB / 0.6907 GB, free: 22.17 MB / 0.573 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 58 * Number of states: 0 () * Number of discrete variables: 6 (TSet.count,$PRE.TSet.count,TSet.T_start,$PRE.TSet.T_start,$whenCondition1,conPI.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (145): * Single equations (assignments): 143 * Array equations: 1 * Algorithm blocks: 1 * 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 0.0002586/0.4552, allocations: 351.5 kB / 0.691 GB, free: 21.9 MB / 0.573 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002238/0.4554, allocations: 255.1 kB / 0.6913 GB, free: 21.77 MB / 0.573 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001101/0.4565, allocations: 0.8176 MB / 0.6921 GB, free: 21.66 MB / 0.573 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.209e-06/0.4565, allocations: 7.531 kB / 0.6921 GB, free: 21.66 MB / 0.573 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.847e-06/0.4565, allocations: 2.688 kB / 0.6921 GB, free: 21.66 MB / 0.573 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0006848/0.4572, allocations: 0.8286 MB / 0.6929 GB, free: 21.18 MB / 0.573 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0026/0.4598, allocations: 2.158 MB / 0.695 GB, free: 20.57 MB / 0.573 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.819e-06/0.4598, allocations: 9.109 kB / 0.695 GB, free: 20.57 MB / 0.573 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0006005/0.4604, allocations: 225.7 kB / 0.6952 GB, free: 20.57 MB / 0.573 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0001465/0.4606, allocations: 52.55 kB / 0.6953 GB, free: 20.56 MB / 0.573 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.051e-05/0.4606, allocations: 32.89 kB / 0.6953 GB, free: 20.55 MB / 0.573 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0007584/0.4614, allocations: 1.761 MB / 0.697 GB, free: 18.85 MB / 0.573 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.473e-06/0.4614, allocations: 5.438 kB / 0.697 GB, free: 18.85 MB / 0.573 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001228/0.4626, allocations: 1.193 MB / 0.6982 GB, free: 18.44 MB / 0.573 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004598/0.4631, allocations: 341.6 kB / 0.6985 GB, free: 18.3 MB / 0.573 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001722/0.4633, allocations: 19.05 kB / 0.6985 GB, free: 18.3 MB / 0.573 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0006517/0.4639, allocations: 99.08 kB / 0.6986 GB, free: 18.3 MB / 0.573 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 8.337e-05/0.464, allocations: 60.72 kB / 0.6987 GB, free: 18.3 MB / 0.573 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.853e-05/0.464, allocations: 32.62 kB / 0.6987 GB, free: 18.3 MB / 0.573 GB Notification: Performance of sorting global known variables: time 0.0007713/0.4648, allocations: 1.005 MB / 0.6997 GB, free: 18.11 MB / 0.573 GB Notification: Performance of sort global known variables: time 7e-08/0.4648, allocations: 0.9688 kB / 0.6997 GB, free: 18.11 MB / 0.573 GB Notification: Performance of remove unused functions: time 0.001745/0.4666, allocations: 1.012 MB / 0.7007 GB, free: 17.96 MB / 0.573 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 5 * Number of states: 7 (vol.dynBal.medium.Xi[1],vol.dynBal.U,vol.dynBal.m,mov.motSpe.y,conPI.I.y,THeaOut.T,hea.outCon.T) * Number of discrete variables: 3 ($whenCondition1,TSet.T_start,TSet.count) * Number of discrete states: 1 (TSet.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (80): * Single equations (assignments): 77 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 2 * 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): 1 system {(1,2,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.0009308/0.4675, allocations: 467.6 kB / 0.7011 GB, free: 17.82 MB / 0.573 GB Notification: Performance of simCode: created initialization part: time 0.001492/0.469, allocations: 1.289 MB / 0.7024 GB, free: 17.58 MB / 0.573 GB Notification: Performance of simCode: created event and clocks part: time 3.407e-06/0.469, allocations: 1 kB / 0.7024 GB, free: 17.58 MB / 0.573 GB Notification: Performance of simCode: created simulation system equations: time 0.0004917/0.4695, allocations: 494.5 kB / 0.7029 GB, free: 17.39 MB / 0.573 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00258/0.472, allocations: 1.189 MB / 0.704 GB, free: 17.25 MB / 0.573 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004867/0.4769, allocations: 3.718 MB / 0.7077 GB, free: 15.51 MB / 0.573 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0003648/0.4773, allocations: 480.3 kB / 0.7081 GB, free: 15.4 MB / 0.573 GB Notification: Performance of simCode: alias equations: time 0.001578/0.4789, allocations: 472.8 kB / 0.7086 GB, free: 15.2 MB / 0.573 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001756/0.4806, allocations: 0.9398 MB / 0.7095 GB, free: 15.12 MB / 0.573 GB Notification: Performance of SimCode: time 2.024e-06/0.4806, allocations: 3.25 kB / 0.7095 GB, free: 15.12 MB / 0.573 GB Notification: Performance of Templates: time 0.05399/0.5346, allocations: 46.33 MB / 0.7547 GB, free: 4.551 MB / 0.5886 GB " [Timeout remaining time 659] make -j1 -f IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.makefile [Timeout 660] (rm -f IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.sim & ./IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T -abortSlowSimulation -alarm=240 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.HeatExchangers.Examples.AirHeater_T.pipe 2>&1) [Timeout 240] [Calling sys.exit(0), Time elapsed: 4.67072563432157]