Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.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 0.001357/0.001357, allocations: 99.64 kB / 18.95 MB, free: 2.668 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 0.002389/0.002389, allocations: 211.9 kB / 22.24 MB, free: 5.262 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 1.476/1.476, allocations: 230.6 MB / 256 MB, free: 7.801 MB / 206.1 MB " [Timeout remaining time 178] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings master/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings master/package.mo): time 3.402/3.402, allocations: 0.5107 GB / 0.8158 GB, free: 17.84 MB / 0.6231 GB " [Timeout remaining time 176] Using package Buildings with version 13.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 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: "" <> buildModelFMU(Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs,fileNamePrefix="Buildings_latest_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_Reliefs",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs,fileNamePrefix="Buildings_latest_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_Reliefs",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 0.002056/0.002056, allocations: 70.95 kB / 1.186 GB, free: 13.8 MB / 0.9044 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3337/0.3357, allocations: 181.8 MB / 1.363 GB, free: 14.11 MB / 1.061 GB Notification: Performance of NFInst.instantiate(Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs): time 0.002605/0.3384, allocations: 0.9603 MB / 1.364 GB, free: 13.14 MB / 1.061 GB Notification: Performance of NFInst.instExpressions: time 0.001499/0.3399, allocations: 0.9571 MB / 1.365 GB, free: 12.18 MB / 1.061 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0001502/0.34, allocations: 4 kB / 1.365 GB, free: 12.17 MB / 1.061 GB Notification: Performance of NFTyping.typeComponents: time 7.106e-05/0.3401, allocations: 15.8 kB / 1.365 GB, free: 12.16 MB / 1.061 GB Notification: Performance of NFTyping.typeBindings: time 0.0001409/0.3402, allocations: 27.69 kB / 1.365 GB, free: 12.13 MB / 1.061 GB Notification: Performance of NFTyping.typeClassSections: time 0.0002343/0.3404, allocations: 75.91 kB / 1.365 GB, free: 12.05 MB / 1.061 GB Notification: Performance of NFFlatten.flatten: time 0.0003122/0.3408, allocations: 188 kB / 1.366 GB, free: 11.87 MB / 1.061 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0001961/0.341, allocations: 69 kB / 1.366 GB, free: 11.8 MB / 1.061 GB Notification: Performance of NFEvalConstants.evaluate: time 0.0001182/0.3411, allocations: 67.72 kB / 1.366 GB, free: 11.73 MB / 1.061 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0001051/0.3412, allocations: 71.61 kB / 1.366 GB, free: 11.66 MB / 1.061 GB Notification: Performance of NFPackage.collectConstants: time 3.786e-05/0.3412, allocations: 20 kB / 1.366 GB, free: 11.64 MB / 1.061 GB Notification: Performance of NFFlatten.collectFunctions: time 3.603e-05/0.3413, allocations: 20 kB / 1.366 GB, free: 11.62 MB / 1.061 GB Notification: Performance of NFScalarize.scalarize: time 5.091e-05/0.3413, allocations: 43.8 kB / 1.366 GB, free: 11.58 MB / 1.061 GB Notification: Performance of NFVerifyModel.verify: time 8.434e-05/0.3414, allocations: 75.64 kB / 1.366 GB, free: 11.51 MB / 1.061 GB Notification: Performance of NFConvertDAE.convert: time 0.000326/0.3417, allocations: 271.1 kB / 1.366 GB, free: 11.24 MB / 1.061 GB Notification: Performance of FrontEnd - DAE generated: time 4.469e-06/0.3417, allocations: 3.938 kB / 1.366 GB, free: 11.24 MB / 1.061 GB Notification: Performance of FrontEnd: time 1.633e-06/0.3417, allocations: 0 / 1.366 GB, free: 11.24 MB / 1.061 GB Notification: Performance of Transformations before backend: time 8.566e-06/0.3417, allocations: 0 / 1.366 GB, free: 11.24 MB / 1.061 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 40 * Number of variables: 40 Notification: Performance of Generate backend data structure: time 0.0007898/0.3425, allocations: 411.4 kB / 1.367 GB, free: 10.8 MB / 1.061 GB Notification: Performance of prepare preOptimizeDAE: time 4.047e-05/0.3426, allocations: 8.031 kB / 1.367 GB, free: 10.8 MB / 1.061 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 6.64e-05/0.3426, allocations: 54.73 kB / 1.367 GB, free: 10.73 MB / 1.061 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 5.017e-05/0.3427, allocations: 20.84 kB / 1.367 GB, free: 10.71 MB / 1.061 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0004848/0.3432, allocations: 198.5 kB / 1.367 GB, free: 10.5 MB / 1.061 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 1.921e-05/0.3432, allocations: 12.7 kB / 1.367 GB, free: 10.48 MB / 1.061 GB Notification: Performance of preOpt expandDerOperator (simulation): time 2.565e-05/0.3432, allocations: 12.38 kB / 1.367 GB, free: 10.47 MB / 1.061 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.0004054/0.3436, allocations: 216.2 kB / 1.367 GB, free: 10.25 MB / 1.061 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.186e-05/0.3436, allocations: 7.938 kB / 1.367 GB, free: 10.24 MB / 1.061 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 1.822e-05/0.3436, allocations: 4 kB / 1.367 GB, free: 10.23 MB / 1.061 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 7.314e-06/0.3436, allocations: 8 kB / 1.367 GB, free: 10.23 MB / 1.061 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0003432/0.344, allocations: 139.8 kB / 1.367 GB, free: 10.09 MB / 1.061 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.0009542/0.3449, allocations: 475.3 kB / 1.368 GB, free: 9.582 MB / 1.061 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0002935/0.3452, allocations: 90.67 kB / 1.368 GB, free: 9.484 MB / 1.061 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0001381/0.3454, allocations: 44.83 kB / 1.368 GB, free: 9.438 MB / 1.061 GB Notification: Performance of preOpt evalFunc (simulation): time 2.604e-05/0.3454, allocations: 0 / 1.368 GB, free: 9.438 MB / 1.061 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.359e-05/0.3454, allocations: 34.56 kB / 1.368 GB, free: 9.395 MB / 1.061 GB Notification: Performance of pre-optimization done (n=9): time 1.292e-06/0.3454, allocations: 0 / 1.368 GB, free: 9.395 MB / 1.061 GB Notification: Performance of matching and sorting (n=9): time 0.0005222/0.346, allocations: 153.5 kB / 1.368 GB, free: 9.238 MB / 1.061 GB Notification: Performance of inlineWhenForInitialization (initialization): time 5.549e-05/0.346, allocations: 59.34 kB / 1.368 GB, free: 9.168 MB / 1.061 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0002521/0.3463, allocations: 203.1 kB / 1.368 GB, free: 8.957 MB / 1.061 GB Notification: Performance of collectPreVariables (initialization): time 2.814e-05/0.3463, allocations: 29.7 kB / 1.368 GB, free: 8.922 MB / 1.061 GB Notification: Performance of collectInitialEqns (initialization): time 0.0001367/0.3464, allocations: 147.7 kB / 1.368 GB, free: 8.773 MB / 1.061 GB Notification: Performance of collectInitialBindings (initialization): time 3.275e-05/0.3465, allocations: 31.73 kB / 1.369 GB, free: 8.742 MB / 1.061 GB Notification: Performance of simplifyInitialFunctions (initialization): time 7.297e-05/0.3465, allocations: 29.72 kB / 1.369 GB, free: 8.707 MB / 1.061 GB Notification: Performance of setup shared object (initialization): time 0.000172/0.3467, allocations: 326.8 kB / 1.369 GB, free: 8.379 MB / 1.061 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0001392/0.3469, allocations: 39.91 kB / 1.369 GB, free: 8.34 MB / 1.061 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0001526/0.347, allocations: 68.27 kB / 1.369 GB, free: 8.258 MB / 1.061 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0002878/0.3473, allocations: 120.6 kB / 1.369 GB, free: 8.125 MB / 1.061 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.531e-06/0.3473, allocations: 4 kB / 1.369 GB, free: 8.121 MB / 1.061 GB Notification: Performance of matching and sorting (n=15) (initialization): time 0.0003713/0.3477, allocations: 165.3 kB / 1.369 GB, free: 7.953 MB / 1.061 GB Notification: Performance of prepare postOptimizeDAE: time 1.749e-05/0.3477, allocations: 4 kB / 1.369 GB, free: 7.949 MB / 1.061 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.456e-06/0.3477, allocations: 7.938 kB / 1.369 GB, free: 7.941 MB / 1.061 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.786e-05/0.3477, allocations: 4.125 kB / 1.369 GB, free: 7.938 MB / 1.061 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0001621/0.3479, allocations: 27.98 kB / 1.369 GB, free: 7.91 MB / 1.061 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.422e-05/0.3479, allocations: 3.938 kB / 1.369 GB, free: 7.906 MB / 1.061 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0001065/0.348, allocations: 19.88 kB / 1.369 GB, free: 7.887 MB / 1.061 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 1.344e-05/0.348, allocations: 8 kB / 1.369 GB, free: 7.879 MB / 1.061 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 5 * 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 (15): * Single equations (assignments): 15 * 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 prepare postOptimizeDAE: time 0.0001211/0.3481, allocations: 126.9 kB / 1.369 GB, free: 7.746 MB / 1.061 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 4.194e-05/0.3482, allocations: 15.91 kB / 1.369 GB, free: 7.73 MB / 1.061 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0004085/0.3486, allocations: 151 kB / 1.37 GB, free: 7.566 MB / 1.061 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.625e-06/0.3486, allocations: 0 / 1.37 GB, free: 7.566 MB / 1.061 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 8.065e-06/0.3486, allocations: 3.938 kB / 1.37 GB, free: 7.562 MB / 1.061 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 4.719e-06/0.3486, allocations: 3.984 kB / 1.37 GB, free: 7.559 MB / 1.061 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0006431/0.3492, allocations: 427.1 kB / 1.37 GB, free: 7.086 MB / 1.061 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.354e-06/0.3492, allocations: 0 / 1.37 GB, free: 7.086 MB / 1.061 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001151/0.3494, allocations: 27.97 kB / 1.37 GB, free: 7.059 MB / 1.061 GB Notification: Performance of postOpt tearingSystem (simulation): time 7.143e-06/0.3494, allocations: 11.88 kB / 1.37 GB, free: 7.047 MB / 1.061 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 1.513e-05/0.3494, allocations: 12 kB / 1.37 GB, free: 7.035 MB / 1.061 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 2.144e-06/0.3494, allocations: 0 / 1.37 GB, free: 7.035 MB / 1.061 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.543e-06/0.3494, allocations: 0 / 1.37 GB, free: 7.035 MB / 1.061 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0003731/0.3498, allocations: 237.1 kB / 1.37 GB, free: 6.781 MB / 1.061 GB Notification: Performance of postOpt removeConstants (simulation): time 3.587e-05/0.3498, allocations: 19.84 kB / 1.37 GB, free: 6.762 MB / 1.061 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 2.179e-05/0.3498, allocations: 4 kB / 1.37 GB, free: 6.758 MB / 1.061 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0001375/0.35, allocations: 11.98 kB / 1.37 GB, free: 6.746 MB / 1.061 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 4.483e-05/0.35, allocations: 15.92 kB / 1.37 GB, free: 6.73 MB / 1.061 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 9.327e-06/0.35, allocations: 8 kB / 1.37 GB, free: 6.723 MB / 1.061 GB Notification: Performance of sorting global known variables: time 0.0001342/0.3501, allocations: 141.2 kB / 1.37 GB, free: 6.586 MB / 1.061 GB Notification: Performance of sort global known variables: time 9e-08/0.3501, allocations: 0 / 1.37 GB, free: 6.586 MB / 1.061 GB Notification: Performance of remove unused functions: time 0.0002759/0.3504, allocations: 31.89 kB / 1.371 GB, free: 6.555 MB / 1.061 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 3 * 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 (11): * Single equations (assignments): 11 * 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 0.0007112/0.3511, allocations: 0.7803 MB / 1.371 GB, free: 5.742 MB / 1.061 GB Notification: Performance of simCode: created initialization part: time 0.0003124/0.3514, allocations: 104 kB / 1.371 GB, free: 5.641 MB / 1.061 GB Notification: Performance of simCode: created event and clocks part: time 2.465e-06/0.3514, allocations: 3.938 kB / 1.371 GB, free: 5.637 MB / 1.061 GB Notification: Performance of simCode: created simulation system equations: time 0.0001298/0.3516, allocations: 47.91 kB / 1.371 GB, free: 5.59 MB / 1.061 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0003735/0.352, allocations: 26.42 kB / 1.371 GB, free: 5.566 MB / 1.061 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002524/0.3545, allocations: 1.888 MB / 1.373 GB, free: 3.57 MB / 1.061 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000122/0.3546, allocations: 115.9 kB / 1.373 GB, free: 3.434 MB / 1.061 GB Notification: Performance of simCode: alias equations: time 9.304e-05/0.3547, allocations: 17.48 kB / 1.373 GB, free: 3.414 MB / 1.061 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 9.574e-05/0.3548, allocations: 63.34 kB / 1.373 GB, free: 3.355 MB / 1.061 GB Notification: Performance of SimCode: time 3.9e-07/0.3548, allocations: 0 / 1.373 GB, free: 3.355 MB / 1.061 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.03505/0.3898, allocations: 3.878 MB / 1.377 GB, free: 15.69 MB / 1.076 GB Notification: Performance of buildModelFMU: Generate platform static: time 11.63/12.02, allocations: 12.81 kB / 1.377 GB, free: 15.68 MB / 1.076 GB " [Timeout remaining time 288] (rm -f Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.pipe ; mkfifo Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.pipe ; head -c 1048576 < Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.pipe >> ../files/Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.sim & python3 -m fmpy simulate --output-file Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv --start-time 0 --stop-time 1800 --timeout 800 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.72 Buildings_latest_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_Reliefs.fmu > Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.pipe 2>&1) [Timeout 840.0] diffSimulationResults("Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv","/mnt/ReferenceFiles/Buildings/csv/master/Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_Reliefs.csv","/var/lib/jenkins1/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300] "Error: Could not read variable mod1.yRetDam in file Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv. Warning: Get data of variable mod1.yRetDam from file Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv failed! Error: Could not read variable mod1.uTSup in file Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv. Warning: Get data of variable mod1.uTSup from file Buildings_latest_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.Reliefs_res.csv failed! " [Timeout remaining time 300] Reference file matches [Calling sys.exit(0), Time elapsed: 19.071390157099813]