Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.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 0.001536/0.001536, allocations: 95.64 kB / 18.95 MB, free: 2.691 MB / 14.72 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 0.001819/0.001819, allocations: 211.6 kB / 22.24 MB, free: 5.242 MB / 14.72 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 1.409/1.409, allocations: 230.6 MB / 256 MB, free: 7.809 MB / 206.1 MB " [Timeout remaining time 178] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.1.1-maint.12.x/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.1.1-maint.12.x/package.mo): time 3.022/3.022, allocations: 0.4892 GB / 0.7943 GB, free: 35.66 MB / 0.6231 GB " [Timeout remaining time 177] Using package Buildings with version 12.1.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.1.1-maint.12.x/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: "" <> buildModelFMU(Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance,fileNamePrefix="Buildings_12_Buildings_ThermalZones_Detailed_BaseClasses_Examples_MixedAirHeatMassBalance",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance,fileNamePrefix="Buildings_12_Buildings_ThermalZones_Detailed_BaseClasses_Examples_MixedAirHeatMassBalance",fmuType="me",version="2.0",platforms={"static"}) [Timeout 300] "Notification: Buildings requested package Modelica of version 4.0.0. Modelica 4.1.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.002005/0.002005, allocations: 69.33 kB / 1.153 GB, free: 25.52 MB / 0.9044 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3382/0.3402, allocations: 176.1 MB / 1.325 GB, free: 2.168 MB / 1.014 GB Notification: Performance of NFInst.instantiate(Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance): time 0.1901/0.5303, allocations: 158 MB / 1.479 GB, free: 3.59 MB / 1.17 GB Notification: Performance of NFInst.instExpressions: time 0.0171/0.5474, allocations: 10.15 MB / 1.489 GB, free: 9.418 MB / 1.186 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002997/0.5504, allocations: 127 kB / 1.489 GB, free: 9.293 MB / 1.186 GB Notification: Performance of NFTyping.typeComponents: time 0.005943/0.5563, allocations: 1.881 MB / 1.491 GB, free: 7.402 MB / 1.186 GB Notification: Performance of NFTyping.typeBindings: time 0.005319/0.5617, allocations: 1.682 MB / 1.493 GB, free: 5.711 MB / 1.186 GB Notification: Performance of NFTyping.typeClassSections: time 0.003029/0.5647, allocations: 0.8069 MB / 1.494 GB, free: 4.906 MB / 1.186 GB Notification: Performance of NFFlatten.flatten: time 0.005164/0.5699, allocations: 3.17 MB / 1.497 GB, free: 1.727 MB / 1.186 GB Notification: Performance of NFFlatten.resolveConnections: time 0.00197/0.5718, allocations: 0.9612 MB / 1.498 GB, free: 0.7344 MB / 1.186 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002794/0.5746, allocations: 1.334 MB / 1.499 GB, free: 15.39 MB / 1.201 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002597/0.5772, allocations: 1.132 MB / 1.5 GB, free: 14.26 MB / 1.201 GB Notification: Performance of NFPackage.collectConstants: time 0.0005686/0.5778, allocations: 128 kB / 1.5 GB, free: 14.14 MB / 1.201 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002185/0.58, allocations: 0.7716 MB / 1.501 GB, free: 13.36 MB / 1.201 GB Notification: Performance of NFScalarize.scalarize: time 0.0007971/0.5808, allocations: 497.9 kB / 1.502 GB, free: 12.88 MB / 1.201 GB Notification: Performance of NFVerifyModel.verify: time 0.001726/0.5825, allocations: 0.8273 MB / 1.502 GB, free: 12.04 MB / 1.201 GB Notification: Performance of NFConvertDAE.convert: time 0.005748/0.5882, allocations: 3.486 MB / 1.506 GB, free: 8.543 MB / 1.201 GB Notification: Performance of FrontEnd - DAE generated: time 5.219e-06/0.5882, allocations: 3.938 kB / 1.506 GB, free: 8.539 MB / 1.201 GB Notification: Performance of FrontEnd: time 1.994e-06/0.5882, allocations: 0 / 1.506 GB, free: 8.539 MB / 1.201 GB Notification: Performance of Transformations before backend: time 0.0001161/0.5884, allocations: 4 kB / 1.506 GB, free: 8.535 MB / 1.201 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 191 * Number of variables: 191 Notification: Performance of Generate backend data structure: time 0.005563/0.5939, allocations: 2.823 MB / 1.509 GB, free: 5.664 MB / 1.201 GB Notification: Performance of prepare preOptimizeDAE: time 4.682e-05/0.594, allocations: 12.03 kB / 1.509 GB, free: 5.652 MB / 1.201 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002338/0.5942, allocations: 126.7 kB / 1.509 GB, free: 5.52 MB / 1.201 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001607/0.5958, allocations: 390 kB / 1.509 GB, free: 5.137 MB / 1.201 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.004304/0.6001, allocations: 1.951 MB / 1.511 GB, free: 3.129 MB / 1.201 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 6.284e-05/0.6002, allocations: 58 kB / 1.511 GB, free: 3.07 MB / 1.201 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001677/0.6003, allocations: 76 kB / 1.511 GB, free: 2.996 MB / 1.201 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001737/0.6021, allocations: 1.045 MB / 1.512 GB, free: 1.883 MB / 1.201 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.893e-05/0.6021, allocations: 0 / 1.512 GB, free: 1.883 MB / 1.201 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 7.693e-05/0.6022, allocations: 32 kB / 1.512 GB, free: 1.852 MB / 1.201 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.356e-05/0.6022, allocations: 28.94 kB / 1.512 GB, free: 1.824 MB / 1.201 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001212/0.6034, allocations: 0.7063 MB / 1.513 GB, free: 1.117 MB / 1.201 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 0.006117/0.6096, allocations: 3.645 MB / 1.516 GB, free: 13.38 MB / 1.217 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0004899/0.6101, allocations: 306.6 kB / 1.517 GB, free: 13.08 MB / 1.217 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.00025/0.6103, allocations: 172.7 kB / 1.517 GB, free: 12.91 MB / 1.217 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0001395/0.6104, allocations: 19.98 kB / 1.517 GB, free: 12.89 MB / 1.217 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 2.95e-05/0.6105, allocations: 34.56 kB / 1.517 GB, free: 12.84 MB / 1.217 GB Notification: Performance of pre-optimization done (n=30): time 2.224e-06/0.6105, allocations: 0 / 1.517 GB, free: 12.84 MB / 1.217 GB Notification: Performance of matching and sorting (n=32): time 0.003073/0.6135, allocations: 1.601 MB / 1.518 GB, free: 11.2 MB / 1.217 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.702e-05/0.6136, allocations: 59.41 kB / 1.518 GB, free: 11.13 MB / 1.217 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003815/0.6174, allocations: 2.969 MB / 1.521 GB, free: 8.145 MB / 1.217 GB Notification: Performance of collectPreVariables (initialization): time 5.91e-05/0.6175, allocations: 29.7 kB / 1.521 GB, free: 8.109 MB / 1.217 GB Notification: Performance of collectInitialEqns (initialization): time 0.0009866/0.6185, allocations: 1.067 MB / 1.522 GB, free: 7.035 MB / 1.217 GB Notification: Performance of collectInitialBindings (initialization): time 0.000135/0.6186, allocations: 123 kB / 1.523 GB, free: 6.914 MB / 1.217 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001643/0.6188, allocations: 110.2 kB / 1.523 GB, free: 6.797 MB / 1.217 GB Notification: Performance of setup shared object (initialization): time 0.0001394/0.6189, allocations: 326 kB / 1.523 GB, free: 6.473 MB / 1.217 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002604/0.6192, allocations: 165 kB / 1.523 GB, free: 6.312 MB / 1.217 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0004488/0.6196, allocations: 447.7 kB / 1.524 GB, free: 5.773 MB / 1.217 GB Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: air.vol.dynBal.medium.p = air.vol.dynBal.p_start (boundary.p = air.vol.dynBal.p_start) Notification: Performance of analyzeInitialSystem (initialization): time 0.002089/0.6217, allocations: 0.9989 MB / 1.525 GB, free: 4.688 MB / 1.217 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.587e-06/0.6217, allocations: 0 / 1.525 GB, free: 4.688 MB / 1.217 GB Notification: Performance of matching and sorting (n=62) (initialization): time 0.001358/0.6231, allocations: 0.8099 MB / 1.525 GB, free: 3.867 MB / 1.217 GB Notification: Performance of prepare postOptimizeDAE: time 2.025e-05/0.6231, allocations: 8 kB / 1.525 GB, free: 3.859 MB / 1.217 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.848e-06/0.6231, allocations: 4 kB / 1.525 GB, free: 3.855 MB / 1.217 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0002032/0.6233, allocations: 68.75 kB / 1.525 GB, free: 3.785 MB / 1.217 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003467/0.6236, allocations: 107.8 kB / 1.526 GB, free: 3.68 MB / 1.217 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001674/0.6253, allocations: 1.754 MB / 1.527 GB, free: 1.816 MB / 1.217 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0009339/0.6262, allocations: 31.88 kB / 1.527 GB, free: 1.785 MB / 1.217 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.75e-05/0.6263, allocations: 24 kB / 1.527 GB, free: 1.762 MB / 1.217 GB Warning: The initial conditions are over specified. The following 1 initial equations are redundant, so they are removed from the initialization system: air.vol.dynBal.medium.p = air.vol.dynBal.p_start. Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 28 * 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 (58): * Single equations (assignments): 57 * 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): 1 system {(1,4,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.001139/0.6274, allocations: 0.7919 MB / 1.528 GB, free: 0.9609 MB / 1.217 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003399/0.6278, allocations: 246.4 kB / 1.528 GB, free: 0.7188 MB / 1.217 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0003893/0.6282, allocations: 251.7 kB / 1.529 GB, free: 480 kB / 1.217 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.569e-06/0.6282, allocations: 4.062 kB / 1.529 GB, free: 476 kB / 1.217 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.544e-06/0.6282, allocations: 8 kB / 1.529 GB, free: 468 kB / 1.217 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0007353/0.6289, allocations: 0.593 MB / 1.529 GB, free: 15.79 MB / 1.232 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003006/0.6319, allocations: 1.876 MB / 1.531 GB, free: 13.82 MB / 1.232 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.717e-06/0.6319, allocations: 0 / 1.531 GB, free: 13.82 MB / 1.232 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002908/0.6322, allocations: 63.91 kB / 1.531 GB, free: 13.75 MB / 1.232 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0001572/0.6324, allocations: 64.94 kB / 1.531 GB, free: 13.69 MB / 1.232 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.681e-05/0.6324, allocations: 8 kB / 1.531 GB, free: 13.68 MB / 1.232 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001582/0.634, allocations: 1.761 MB / 1.533 GB, free: 11.8 MB / 1.232 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.398e-06/0.634, allocations: 4 kB / 1.533 GB, free: 11.8 MB / 1.232 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001236/0.6352, allocations: 0.9357 MB / 1.534 GB, free: 10.8 MB / 1.232 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0008117/0.636, allocations: 351.5 kB / 1.534 GB, free: 10.45 MB / 1.232 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000188/0.6362, allocations: 15.98 kB / 1.534 GB, free: 10.44 MB / 1.232 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0005531/0.6368, allocations: 8 kB / 1.534 GB, free: 10.43 MB / 1.232 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 5.726e-05/0.6368, allocations: 35.92 kB / 1.534 GB, free: 10.39 MB / 1.232 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.908e-05/0.6368, allocations: 16.12 kB / 1.534 GB, free: 10.38 MB / 1.232 GB Notification: Performance of sorting global known variables: time 0.00293/0.6398, allocations: 2.091 MB / 1.536 GB, free: 8.285 MB / 1.232 GB Notification: Performance of sort global known variables: time 6e-08/0.6398, allocations: 0 / 1.536 GB, free: 8.285 MB / 1.232 GB Notification: Performance of remove unused functions: time 0.001022/0.6408, allocations: 304 kB / 1.536 GB, free: 7.988 MB / 1.232 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 14 * Number of states: 2 (air.vol.dynBal.medium.Xi[1],air.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 (29): * Single equations (assignments): 28 * 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): 1 system {(1,4,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.001694/0.6425, allocations: 1.534 MB / 1.538 GB, free: 6.383 MB / 1.232 GB Notification: Performance of simCode: created initialization part: time 0.000935/0.6434, allocations: 0.5152 MB / 1.538 GB, free: 5.855 MB / 1.232 GB Notification: Performance of simCode: created event and clocks part: time 3.697e-06/0.6434, allocations: 5.688 kB / 1.538 GB, free: 5.852 MB / 1.232 GB Notification: Performance of simCode: created simulation system equations: time 0.0004064/0.6438, allocations: 295.2 kB / 1.539 GB, free: 5.551 MB / 1.232 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003288/0.6471, allocations: 0.9453 MB / 1.54 GB, free: 4.629 MB / 1.232 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.02374/0.6709, allocations: 17.15 MB / 1.556 GB, free: 3.062 MB / 1.248 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001493/0.6724, allocations: 1.38 MB / 1.558 GB, free: 1.637 MB / 1.248 GB Notification: Performance of simCode: alias equations: time 0.001144/0.6735, allocations: 342.8 kB / 1.558 GB, free: 1.297 MB / 1.248 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0009609/0.6745, allocations: 0.8 MB / 1.559 GB, free: 0.4961 MB / 1.248 GB Notification: Performance of SimCode: time 1.242e-06/0.6745, allocations: 0 / 1.559 GB, free: 0.4961 MB / 1.248 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.7402/1.415, allocations: 55.56 MB / 1.613 GB, free: 276.4 MB / 1.295 GB Notification: Performance of buildModelFMU: Generate platform static: time 13.62/15.04, allocations: 9.188 kB / 1.613 GB, free: 276.4 MB / 1.295 GB " [Timeout remaining time 285] (rm -f Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.pipe ; mkfifo Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.pipe ; head -c 1048576 < Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.pipe >> ../files/Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.sim & python3 -m fmpy simulate --output-file Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv --start-time 0 --stop-time 3600 --timeout 400 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 1.44 Buildings_12_Buildings_ThermalZones_Detailed_BaseClasses_Examples_MixedAirHeatMassBalance.fmu > Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.pipe 2>&1) [Timeout 420.0] diffSimulationResults("Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv","/mnt/ReferenceFiles/Buildings/csv/maint_12.x/Buildings_ThermalZones_Detailed_BaseClasses_Examples_MixedAirHeatMassBalance.csv","/var/lib/jenkins1/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300] "Error: Could not read variable air.vol.T in file Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv. Warning: Get data of variable air.vol.T from file Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv failed! Error: Could not read variable air.vol.Xi[1] in file Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv. Warning: Get data of variable air.vol.Xi[1] from file Buildings_12_Buildings.ThermalZones.Detailed.BaseClasses.Examples.MixedAirHeatMassBalance_res.csv failed! " [Timeout remaining time 300] Reference file matches [Calling sys.exit(0), Time elapsed: 21.56279717106372]