Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.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 0.001926/0.001926, allocations: 110.2 kB / 19.69 MB, free: 2.254 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 0.002669/0.002669, allocations: 214.8 kB / 23.01 MB, free: 4.566 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 1.567/1.567, allocations: 230.6 MB / 256.8 MB, free: 8.004 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 3.378/3.378, allocations: 0.49 GB / 0.7958 GB, free: 33.41 MB / 0.6231 GB " [Timeout remaining time 176] 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: translateModel(Buildings.Fluid.Actuators.Dampers.Examples.MixingBox,tolerance=1e-06,outputFormat="mat",numberOfIntervals=2500,variableFilter="time|mixBox.damOA.m_flow|mixBox.damExh.m_flow|mixBox.damRec.m_flow",fileNamePrefix="Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox") translateModel(Buildings.Fluid.Actuators.Dampers.Examples.MixingBox,tolerance=1e-06,outputFormat="mat",numberOfIntervals=2500,variableFilter="time|mixBox.damOA.m_flow|mixBox.damExh.m_flow|mixBox.damRec.m_flow",fileNamePrefix="Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox") [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 0.002152/0.002152, allocations: 66.31 kB / 1.155 GB, free: 25.36 MB / 0.9044 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.4252/0.4273, allocations: 176.1 MB / 1.327 GB, free: 1.43 MB / 1.014 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Actuators.Dampers.Examples.MixingBox): time 0.2406/0.6679, allocations: 193.5 MB / 1.516 GB, free: 15.18 MB / 1.217 GB Notification: Performance of NFInst.instExpressions: time 0.008625/0.6766, allocations: 4.253 MB / 1.52 GB, free: 10.92 MB / 1.217 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001468/0.678, allocations: 39.62 kB / 1.52 GB, free: 10.88 MB / 1.217 GB Notification: Performance of NFTyping.typeComponents: time 0.001595/0.6796, allocations: 0.5123 MB / 1.521 GB, free: 10.37 MB / 1.217 GB Notification: Performance of NFTyping.typeBindings: time 0.004535/0.6842, allocations: 1.62 MB / 1.522 GB, free: 8.742 MB / 1.217 GB Notification: Performance of NFTyping.typeClassSections: time 0.004053/0.6882, allocations: 1.393 MB / 1.524 GB, free: 7.359 MB / 1.217 GB Notification: Performance of NFFlatten.flatten: time 0.003667/0.6919, allocations: 2.217 MB / 1.526 GB, free: 5.137 MB / 1.217 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001511/0.6934, allocations: 0.9132 MB / 1.527 GB, free: 4.207 MB / 1.217 GB Notification: Performance of NFEvalConstants.evaluate: time 0.00263/0.696, allocations: 1.199 MB / 1.528 GB, free: 3.004 MB / 1.217 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001459/0.6975, allocations: 0.8873 MB / 1.529 GB, free: 2.113 MB / 1.217 GB Notification: Performance of NFPackage.collectConstants: time 0.0002391/0.6977, allocations: 140 kB / 1.529 GB, free: 1.977 MB / 1.217 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002759/0.7005, allocations: 1.294 MB / 1.53 GB, free: 0.6797 MB / 1.217 GB Notification: Performance of NFScalarize.scalarize: time 0.0004694/0.7009, allocations: 426.6 kB / 1.531 GB, free: 268 kB / 1.217 GB Notification: Performance of NFVerifyModel.verify: time 0.0008147/0.7018, allocations: 0.6376 MB / 1.531 GB, free: 15.62 MB / 1.232 GB Notification: Performance of NFConvertDAE.convert: time 0.00314/0.7049, allocations: 1.943 MB / 1.533 GB, free: 13.67 MB / 1.232 GB Notification: Performance of FrontEnd - DAE generated: time 1.24e-05/0.7049, allocations: 8 kB / 1.533 GB, free: 13.66 MB / 1.232 GB Notification: Performance of FrontEnd: time 1.763e-06/0.7049, allocations: 0 / 1.533 GB, free: 13.66 MB / 1.232 GB Notification: Performance of Transformations before backend: time 1.817e-05/0.7049, allocations: 0 / 1.533 GB, free: 13.66 MB / 1.232 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 116 * Number of variables: 116 Notification: Performance of Generate backend data structure: time 0.004734/0.7097, allocations: 1.604 MB / 1.535 GB, free: 12.02 MB / 1.232 GB Notification: Performance of prepare preOptimizeDAE: time 5.929e-05/0.7097, allocations: 16.03 kB / 1.535 GB, free: 12.01 MB / 1.232 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002007/0.7117, allocations: 303 kB / 1.535 GB, free: 11.71 MB / 1.232 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002241/0.714, allocations: 0.9916 MB / 1.536 GB, free: 10.68 MB / 1.232 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.833e-05/0.714, allocations: 41 kB / 1.536 GB, free: 10.64 MB / 1.232 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001195/0.7142, allocations: 63.94 kB / 1.536 GB, free: 10.57 MB / 1.232 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001425/0.7156, allocations: 0.6232 MB / 1.537 GB, free: 9.945 MB / 1.232 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.797e-05/0.7156, allocations: 0 / 1.537 GB, free: 9.945 MB / 1.232 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.469e-05/0.7157, allocations: 20 kB / 1.537 GB, free: 9.926 MB / 1.232 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.666e-05/0.7157, allocations: 12 kB / 1.537 GB, free: 9.914 MB / 1.232 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.00143/0.7171, allocations: 0.6402 MB / 1.537 GB, free: 9.273 MB / 1.232 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 0.00495/0.7221, allocations: 2.574 MB / 1.54 GB, free: 6.566 MB / 1.232 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001238/0.7233, allocations: 0.5022 MB / 1.54 GB, free: 6.055 MB / 1.232 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0006915/0.724, allocations: 348.6 kB / 1.541 GB, free: 5.711 MB / 1.232 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0003376/0.7243, allocations: 56.02 kB / 1.541 GB, free: 5.656 MB / 1.232 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.806e-05/0.7244, allocations: 46.5 kB / 1.541 GB, free: 5.602 MB / 1.232 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.0009179/0.7253, allocations: 191.6 kB / 1.541 GB, free: 5.414 MB / 1.232 GB Notification: Performance of pre-optimization done (n=41): time 2.515e-06/0.7253, allocations: 4 kB / 1.541 GB, free: 5.41 MB / 1.232 GB Notification: Performance of matching and sorting (n=41): time 0.00255/0.7278, allocations: 1.019 MB / 1.542 GB, free: 4.383 MB / 1.232 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.866e-05/0.7279, allocations: 55.41 kB / 1.542 GB, free: 4.316 MB / 1.232 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002042/0.7299, allocations: 1.229 MB / 1.543 GB, free: 3.066 MB / 1.232 GB Notification: Performance of collectPreVariables (initialization): time 7.05e-05/0.73, allocations: 41.7 kB / 1.543 GB, free: 3.02 MB / 1.232 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004244/0.7304, allocations: 425.8 kB / 1.544 GB, free: 2.602 MB / 1.232 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001598/0.7306, allocations: 146.7 kB / 1.544 GB, free: 2.457 MB / 1.232 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0002291/0.7308, allocations: 117.6 kB / 1.544 GB, free: 2.336 MB / 1.232 GB Notification: Performance of setup shared object (initialization): time 0.0001537/0.731, allocations: 318 kB / 1.544 GB, free: 2.02 MB / 1.232 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0006221/0.7316, allocations: 276.4 kB / 1.545 GB, free: 1.746 MB / 1.232 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0008541/0.7324, allocations: 487.2 kB / 1.545 GB, free: 1.195 MB / 1.232 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001272/0.7337, allocations: 0.5752 MB / 1.546 GB, free: 0.6172 MB / 1.232 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.174e-06/0.7337, allocations: 0 / 1.546 GB, free: 0.6172 MB / 1.232 GB Notification: Performance of matching and sorting (n=42) (initialization): time 0.001688/0.7354, allocations: 0.742 MB / 1.546 GB, free: 15.87 MB / 1.248 GB Notification: Performance of prepare postOptimizeDAE: time 2.177e-05/0.7354, allocations: 4 kB / 1.546 GB, free: 15.86 MB / 1.248 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.698e-06/0.7354, allocations: 7.938 kB / 1.546 GB, free: 15.86 MB / 1.248 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.805e-05/0.7355, allocations: 0 / 1.546 GB, free: 15.86 MB / 1.248 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006401/0.7361, allocations: 107.8 kB / 1.546 GB, free: 15.75 MB / 1.248 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.219e-05/0.7361, allocations: 12 kB / 1.546 GB, free: 15.74 MB / 1.248 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001196/0.7373, allocations: 99.8 kB / 1.546 GB, free: 15.64 MB / 1.248 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.099e-05/0.7374, allocations: 19.97 kB / 1.546 GB, free: 15.62 MB / 1.248 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0008969/0.7383, allocations: 463.9 kB / 1.547 GB, free: 15.16 MB / 1.248 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.000845/0.7391, allocations: 478 kB / 1.547 GB, free: 14.62 MB / 1.248 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.001197/0.7403, allocations: 0.5643 MB / 1.548 GB, free: 14.05 MB / 1.248 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 1.242e-06/0.7403, allocations: 4 kB / 1.548 GB, free: 14.04 MB / 1.248 GB Notification: Performance of matching and sorting (n=42) (initialization_lambda0): time 0.001612/0.7419, allocations: 0.7232 MB / 1.549 GB, free: 13.31 MB / 1.248 GB Notification: Performance of prepare postOptimizeDAE: time 1.22e-05/0.7419, allocations: 7.938 kB / 1.549 GB, free: 13.3 MB / 1.248 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.589e-06/0.7419, allocations: 8 kB / 1.549 GB, free: 13.3 MB / 1.248 GB Notification: Performance of postOpt tearingSystem (initialization): time 4.318e-06/0.7419, allocations: 0 / 1.549 GB, free: 13.3 MB / 1.248 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0005994/0.7425, allocations: 107.8 kB / 1.549 GB, free: 13.19 MB / 1.248 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 5.741e-06/0.7425, allocations: 4 kB / 1.549 GB, free: 13.19 MB / 1.248 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001306/0.7438, allocations: 124.3 kB / 1.549 GB, free: 13.06 MB / 1.248 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.119e-05/0.7439, allocations: 23.97 kB / 1.549 GB, free: 13.04 MB / 1.248 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 1 * 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 (42): * Single equations (assignments): 42 * 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 0.0002538/0.7442, allocations: 204.2 kB / 1.549 GB, free: 12.83 MB / 1.248 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002102/0.7444, allocations: 107.2 kB / 1.549 GB, free: 12.73 MB / 1.248 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001842/0.7462, allocations: 0.8064 MB / 1.55 GB, free: 11.91 MB / 1.248 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 7.675e-06/0.7462, allocations: 4 kB / 1.55 GB, free: 11.91 MB / 1.248 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.494e-06/0.7462, allocations: 3.984 kB / 1.55 GB, free: 11.9 MB / 1.248 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.572e-06/0.7462, allocations: 0 / 1.55 GB, free: 11.9 MB / 1.248 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003458/0.7497, allocations: 1.888 MB / 1.552 GB, free: 9.938 MB / 1.248 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.342e-06/0.7497, allocations: 3.984 kB / 1.552 GB, free: 9.934 MB / 1.248 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.000583/0.7503, allocations: 107.9 kB / 1.552 GB, free: 9.828 MB / 1.248 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.063e-05/0.7503, allocations: 7.984 kB / 1.552 GB, free: 9.82 MB / 1.248 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.362e-05/0.7503, allocations: 16 kB / 1.552 GB, free: 9.805 MB / 1.248 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 1.087e-05/0.7504, allocations: 7.938 kB / 1.552 GB, free: 9.797 MB / 1.248 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.133e-05/0.7504, allocations: 12.16 kB / 1.552 GB, free: 9.785 MB / 1.248 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002307/0.7527, allocations: 1.236 MB / 1.553 GB, free: 8.504 MB / 1.248 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005194/0.7532, allocations: 211 kB / 1.553 GB, free: 8.297 MB / 1.248 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001402/0.7533, allocations: 12 kB / 1.553 GB, free: 8.285 MB / 1.248 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0009635/0.7543, allocations: 63.97 kB / 1.553 GB, free: 8.223 MB / 1.248 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001215/0.7544, allocations: 47.86 kB / 1.554 GB, free: 8.176 MB / 1.248 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.276e-05/0.7545, allocations: 16 kB / 1.554 GB, free: 8.16 MB / 1.248 GB Notification: Performance of sorting global known variables: time 0.001508/0.756, allocations: 0.9 MB / 1.554 GB, free: 7.25 MB / 1.248 GB Notification: Performance of sort global known variables: time 9e-08/0.756, allocations: 0 / 1.554 GB, free: 7.25 MB / 1.248 GB Notification: Performance of remove unused functions: time 0.001225/0.7572, allocations: 387.5 kB / 1.555 GB, free: 6.871 MB / 1.248 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 10 * Number of states: 1 (mixBox.actPos.y) * 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 (50): * Single equations (assignments): 50 * 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 0.0004187/0.7576, allocations: 211 kB / 1.555 GB, free: 6.656 MB / 1.248 GB Notification: Performance of simCode: created initialization part: time 0.002144/0.7598, allocations: 0.9043 MB / 1.556 GB, free: 5.754 MB / 1.248 GB Notification: Performance of simCode: created event and clocks part: time 3.336e-06/0.7598, allocations: 0 / 1.556 GB, free: 5.754 MB / 1.248 GB Notification: Performance of simCode: created simulation system equations: time 0.0006729/0.7604, allocations: 316.4 kB / 1.556 GB, free: 5.445 MB / 1.248 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001952/0.7624, allocations: 433.4 kB / 1.557 GB, free: 5.027 MB / 1.248 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002894/0.7653, allocations: 1.671 MB / 1.558 GB, free: 3.293 MB / 1.248 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006992/0.766, allocations: 1.026 MB / 1.559 GB, free: 2.234 MB / 1.248 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003924/0.7664, allocations: 95.38 kB / 1.559 GB, free: 2.141 MB / 1.248 GB Notification: Performance of SimCode: time 5.31e-07/0.7664, allocations: 0 / 1.559 GB, free: 2.141 MB / 1.248 GB Notification: Performance of Templates: time 0.02796/0.7943, allocations: 16.27 MB / 1.575 GB, free: 2.023 MB / 1.264 GB " [Timeout remaining time 299] make -j1 -f Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.makefile [Timeout 300] (rm -f Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.pipe ; mkfifo Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.pipe ; head -c 1048576 < Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.pipe >> ../files/Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.sim & ./Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox -abortSlowSimulation -alarm=400 -emit_protected -lv LOG_STATS > Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.pipe 2>&1) [Timeout 400] diffSimulationResults("Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox_res.mat","/mnt/ReferenceFiles/Buildings/csv/maint_12.x/Buildings_Fluid_Actuators_Dampers_Examples_MixingBox.csv","/var/lib/jenkins1/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_12_Buildings.Fluid.Actuators.Dampers.Examples.MixingBox.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300] "" [Timeout remaining time 300] Reference file matches [Calling sys.exit(0), Time elapsed: 15.200017819995992]