Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.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 0.001258/0.001258, allocations: 99.75 kB / 18.95 MB, free: 2.832 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 0.001418/0.001418, allocations: 217.8 kB / 22.25 MB, free: 5.105 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 1.4/1.4, allocations: 230.6 MB / 256 MB, free: 7.805 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 3.029/3.029, allocations: 0.49 GB / 0.7951 GB, free: 35.47 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.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck,fileNamePrefix="Buildings_12_Buildings_Media_Specialized_Air_Examples_PerfectGasDerivativeCheck",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck,fileNamePrefix="Buildings_12_Buildings_Media_Specialized_Air_Examples_PerfectGasDerivativeCheck",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 0.002021/0.002021, allocations: 67.22 kB / 1.154 GB, free: 25.49 MB / 0.9044 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3394/0.3414, allocations: 176.1 MB / 1.326 GB, free: 1.484 MB / 1.014 GB Notification: Performance of NFInst.instantiate(Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck): time 0.002279/0.3437, allocations: 1.277 MB / 1.327 GB, free: 204 kB / 1.014 GB Notification: Performance of NFInst.instExpressions: time 0.1607/0.5044, allocations: 129.1 MB / 1.453 GB, free: 14.65 MB / 1.154 GB Notification: Performance of NFInst.updateImplicitVariability: time 4.405e-05/0.5044, allocations: 0 / 1.453 GB, free: 14.65 MB / 1.154 GB Notification: Performance of NFTyping.typeComponents: time 2.419e-05/0.5045, allocations: 3.938 kB / 1.453 GB, free: 14.64 MB / 1.154 GB Notification: Performance of NFTyping.typeBindings: time 5.503e-05/0.5045, allocations: 7.984 kB / 1.453 GB, free: 14.64 MB / 1.154 GB Notification: Performance of NFTyping.typeClassSections: time 0.0005241/0.505, allocations: 91.56 kB / 1.453 GB, free: 14.55 MB / 1.154 GB Notification: Performance of NFFlatten.flatten: time 8.68e-05/0.5051, allocations: 31.86 kB / 1.453 GB, free: 14.52 MB / 1.154 GB Notification: Performance of NFFlatten.resolveConnections: time 4.764e-05/0.5052, allocations: 4 kB / 1.453 GB, free: 14.51 MB / 1.154 GB Notification: Performance of NFEvalConstants.evaluate: time 4.886e-05/0.5052, allocations: 23.92 kB / 1.453 GB, free: 14.49 MB / 1.154 GB Notification: Performance of NFSimplifyModel.simplify: time 6.273e-05/0.5053, allocations: 11.92 kB / 1.453 GB, free: 14.48 MB / 1.154 GB Notification: Performance of NFPackage.collectConstants: time 1.594e-05/0.5053, allocations: 4 kB / 1.453 GB, free: 14.47 MB / 1.154 GB Notification: Performance of NFFlatten.collectFunctions: time 0.000279/0.5056, allocations: 75.83 kB / 1.453 GB, free: 14.4 MB / 1.154 GB Notification: Performance of NFScalarize.scalarize: time 1.934e-05/0.5056, allocations: 11.98 kB / 1.453 GB, free: 14.39 MB / 1.154 GB Notification: Performance of NFVerifyModel.verify: time 4.224e-05/0.5056, allocations: 19.92 kB / 1.453 GB, free: 14.37 MB / 1.154 GB Notification: Performance of NFConvertDAE.convert: time 0.0001732/0.5058, allocations: 56.11 kB / 1.453 GB, free: 14.31 MB / 1.154 GB Notification: Performance of FrontEnd - DAE generated: time 4.008e-06/0.5058, allocations: 0 / 1.453 GB, free: 14.31 MB / 1.154 GB Notification: Performance of FrontEnd: time 1.483e-06/0.5058, allocations: 0 / 1.453 GB, free: 14.31 MB / 1.154 GB Notification: Performance of Transformations before backend: time 6.021e-06/0.5058, allocations: 0 / 1.453 GB, free: 14.31 MB / 1.154 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 7 * Number of variables: 7 Notification: Performance of Generate backend data structure: time 0.0004463/0.5063, allocations: 291.3 kB / 1.454 GB, free: 14 MB / 1.154 GB Notification: Performance of prepare preOptimizeDAE: time 4.255e-05/0.5063, allocations: 8.031 kB / 1.454 GB, free: 13.99 MB / 1.154 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 5.39e-05/0.5064, allocations: 38.75 kB / 1.454 GB, free: 13.95 MB / 1.154 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0001949/0.5066, allocations: 12.92 kB / 1.454 GB, free: 13.93 MB / 1.154 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0001071/0.5067, allocations: 110.2 kB / 1.454 GB, free: 13.8 MB / 1.154 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 1.663e-05/0.5067, allocations: 4 kB / 1.454 GB, free: 13.8 MB / 1.154 GB Notification: Performance of preOpt expandDerOperator (simulation): time 2.539e-05/0.5067, allocations: 4 kB / 1.454 GB, free: 13.79 MB / 1.154 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.0001926/0.5069, allocations: 130.8 kB / 1.454 GB, free: 13.64 MB / 1.154 GB Notification: Performance of preOpt findStateOrder (simulation): time 8.015e-06/0.5069, allocations: 0 / 1.454 GB, free: 13.64 MB / 1.154 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 1.387e-05/0.5069, allocations: 8 kB / 1.454 GB, free: 13.63 MB / 1.154 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.109e-06/0.5069, allocations: 4 kB / 1.454 GB, free: 13.63 MB / 1.154 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 5.802e-05/0.507, allocations: 15.92 kB / 1.454 GB, free: 13.61 MB / 1.154 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.0001943/0.5072, allocations: 140.6 kB / 1.454 GB, free: 13.43 MB / 1.154 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0001142/0.5073, allocations: 46.56 kB / 1.454 GB, free: 13.38 MB / 1.154 GB Notification: Performance of preOpt resolveLoops (simulation): time 3.334e-05/0.5073, allocations: 20.84 kB / 1.454 GB, free: 13.36 MB / 1.154 GB Notification: Performance of preOpt evalFunc (simulation): time 1.123e-05/0.5073, allocations: 7.938 kB / 1.454 GB, free: 13.35 MB / 1.154 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.196e-05/0.5074, allocations: 30.56 kB / 1.454 GB, free: 13.31 MB / 1.154 GB Notification: Performance of pre-optimization done (n=7): time 1.102e-06/0.5074, allocations: 0 / 1.454 GB, free: 13.31 MB / 1.154 GB Notification: Performance of matching and sorting (n=11): time 0.0007243/0.5081, allocations: 305.2 kB / 1.455 GB, free: 12.98 MB / 1.154 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.004e-05/0.5081, allocations: 55.41 kB / 1.455 GB, free: 12.91 MB / 1.154 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 7.258e-05/0.5082, allocations: 89.86 kB / 1.455 GB, free: 12.81 MB / 1.154 GB Notification: Performance of collectPreVariables (initialization): time 2.45e-05/0.5082, allocations: 33.7 kB / 1.455 GB, free: 12.77 MB / 1.154 GB Notification: Performance of collectInitialEqns (initialization): time 3.45e-05/0.5083, allocations: 80.14 kB / 1.455 GB, free: 12.69 MB / 1.154 GB Notification: Performance of collectInitialBindings (initialization): time 4.322e-05/0.5083, allocations: 35.69 kB / 1.455 GB, free: 12.66 MB / 1.154 GB Notification: Performance of simplifyInitialFunctions (initialization): time 4.173e-05/0.5084, allocations: 25.72 kB / 1.455 GB, free: 12.62 MB / 1.154 GB Notification: Performance of setup shared object (initialization): time 0.00014/0.5085, allocations: 326.8 kB / 1.455 GB, free: 12.3 MB / 1.154 GB Notification: Performance of preBalanceInitialSystem (initialization): time 3.3e-05/0.5085, allocations: 16 kB / 1.455 GB, free: 12.28 MB / 1.154 GB Notification: Performance of partitionIndependentBlocks (initialization): time 5.163e-05/0.5086, allocations: 37.7 kB / 1.455 GB, free: 12.24 MB / 1.154 GB Notification: Performance of analyzeInitialSystem (initialization): time 8.717e-05/0.5087, allocations: 65.77 kB / 1.455 GB, free: 12.17 MB / 1.154 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 7.32e-07/0.5087, allocations: 0 / 1.455 GB, free: 12.17 MB / 1.154 GB Notification: Performance of matching and sorting (n=14) (initialization): time 0.0001392/0.5088, allocations: 98.25 kB / 1.455 GB, free: 12.07 MB / 1.154 GB Notification: Performance of prepare postOptimizeDAE: time 1.328e-05/0.5088, allocations: 4 kB / 1.455 GB, free: 12.06 MB / 1.154 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.359e-06/0.5088, allocations: 0 / 1.455 GB, free: 12.06 MB / 1.154 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.21e-05/0.5088, allocations: 0 / 1.455 GB, free: 12.06 MB / 1.154 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000116/0.509, allocations: 27.92 kB / 1.455 GB, free: 12.04 MB / 1.154 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 4.879e-06/0.509, allocations: 0 / 1.455 GB, free: 12.04 MB / 1.154 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 3.193e-05/0.509, allocations: 4 kB / 1.455 GB, free: 12.03 MB / 1.154 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.829e-06/0.509, allocations: 7.938 kB / 1.455 GB, free: 12.02 MB / 1.154 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 2 * 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 (14): * Single equations (assignments): 14 * 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 8.346e-05/0.5091, allocations: 118.4 kB / 1.456 GB, free: 11.9 MB / 1.154 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 1.37e-05/0.5091, allocations: 4 kB / 1.456 GB, free: 11.89 MB / 1.154 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 3.658e-05/0.5091, allocations: 11.89 kB / 1.456 GB, free: 11.88 MB / 1.154 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.909e-06/0.5091, allocations: 3.984 kB / 1.456 GB, free: 11.88 MB / 1.154 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 5.581e-06/0.5091, allocations: 4 kB / 1.456 GB, free: 11.87 MB / 1.154 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.284e-06/0.5091, allocations: 0 / 1.456 GB, free: 11.87 MB / 1.154 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.000126/0.5093, allocations: 140.7 kB / 1.456 GB, free: 11.69 MB / 1.154 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.322e-06/0.5093, allocations: 3.938 kB / 1.456 GB, free: 11.69 MB / 1.154 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001134/0.5094, allocations: 20 kB / 1.456 GB, free: 11.67 MB / 1.154 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.823e-06/0.5094, allocations: 3.938 kB / 1.456 GB, free: 11.66 MB / 1.154 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 1.443e-05/0.5094, allocations: 7.984 kB / 1.456 GB, free: 11.66 MB / 1.154 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 1.623e-06/0.5094, allocations: 4 kB / 1.456 GB, free: 11.65 MB / 1.154 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 7.52e-07/0.5094, allocations: 4 kB / 1.456 GB, free: 11.65 MB / 1.154 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0002084/0.5096, allocations: 137 kB / 1.456 GB, free: 11.5 MB / 1.154 GB Notification: Performance of postOpt removeConstants (simulation): time 4.699e-05/0.5097, allocations: 7.984 kB / 1.456 GB, free: 11.49 MB / 1.154 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 1.317e-05/0.5097, allocations: 4 kB / 1.456 GB, free: 11.48 MB / 1.154 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 7.752e-05/0.5097, allocations: 4 kB / 1.456 GB, free: 11.48 MB / 1.154 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 1.85e-05/0.5098, allocations: 11.92 kB / 1.456 GB, free: 11.47 MB / 1.154 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 8.045e-06/0.5098, allocations: 4 kB / 1.456 GB, free: 11.46 MB / 1.154 GB Notification: Performance of sorting global known variables: time 4.595e-05/0.5098, allocations: 83.16 kB / 1.456 GB, free: 11.38 MB / 1.154 GB Notification: Performance of sort global known variables: time 8e-08/0.5098, allocations: 0 / 1.456 GB, free: 11.38 MB / 1.154 GB Notification: Performance of remove unused functions: time 0.0001905/0.51, allocations: 24.03 kB / 1.456 GB, free: 11.36 MB / 1.154 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 3 (hLiqSym,hSteSym,hAirSym) * 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 0.0004901/0.5105, allocations: 0.6694 MB / 1.457 GB, free: 10.66 MB / 1.154 GB Notification: Performance of simCode: created initialization part: time 0.0001445/0.5106, allocations: 55.92 kB / 1.457 GB, free: 10.61 MB / 1.154 GB Notification: Performance of simCode: created event and clocks part: time 2.575e-06/0.5106, allocations: 0 / 1.457 GB, free: 10.61 MB / 1.154 GB Notification: Performance of simCode: created simulation system equations: time 4.253e-05/0.5107, allocations: 27.92 kB / 1.457 GB, free: 10.58 MB / 1.154 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0002432/0.5109, allocations: 14.03 kB / 1.457 GB, free: 10.57 MB / 1.154 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.001454/0.5124, allocations: 1.454 MB / 1.458 GB, free: 9.027 MB / 1.154 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 6.077e-05/0.5125, allocations: 71.34 kB / 1.458 GB, free: 8.938 MB / 1.154 GB Notification: Performance of simCode: alias equations: time 4.907e-05/0.5125, allocations: 12.66 kB / 1.458 GB, free: 8.926 MB / 1.154 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 4.44e-05/0.5125, allocations: 19.44 kB / 1.458 GB, free: 8.906 MB / 1.154 GB Notification: Performance of SimCode: time 3.21e-07/0.5125, allocations: 0 / 1.458 GB, free: 8.906 MB / 1.154 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.03073/0.5433, allocations: 2.252 MB / 1.46 GB, free: 6.797 MB / 1.154 GB Notification: Performance of buildModelFMU: Generate platform static: time 10.43/10.98, allocations: 2.531 kB / 1.46 GB, free: 6.797 MB / 1.154 GB " [Timeout remaining time 289] (rm -f Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.pipe ; mkfifo Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.pipe ; head -c 1048576 < Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.pipe >> ../files/Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.sim & python3 -m fmpy simulate --output-file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv --start-time 0 --stop-time 1 --timeout 400 --relative-tolerance 1e-08 --interface-type ModelExchange --solver CVode --output-interval 0.0004 Buildings_12_Buildings_Media_Specialized_Air_Examples_PerfectGasDerivativeCheck.fmu > Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.pipe 2>&1) [Timeout 420.0] diffSimulationResults("Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv","/mnt/ReferenceFiles/Buildings/csv/maint_12.x/Buildings_Media_Specialized_Air_Examples_PerfectGasDerivativeCheck.csv","/var/lib/jenkins1/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300] "Error: Could not read variable der(hLiqSym) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hLiqSym) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! Error: Could not read variable der(hLiqCod) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hLiqCod) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! Error: Could not read variable der(hSteSym) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hSteSym) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! Error: Could not read variable der(hSteCod) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hSteCod) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! Error: Could not read variable der(hAirSym) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hAirSym) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! Error: Could not read variable der(hAirCod) in file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv. Warning: Get data of variable der(hAirCod) from file Buildings_12_Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck_res.csv failed! " [Timeout remaining time 300] Reference file matches [Calling sys.exit(0), Time elapsed: 17.402002296992578]