Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.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 0.0009224/0.0009224, allocations: 88.22 kB / 19.64 MB, free: 276 kB / 13.93 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 0.0009607/0.0009607, allocations: 177 kB / 23.03 MB, free: 1.535 MB / 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 0.9607/0.9607, allocations: 177.1 MB / 203.4 MB, free: 5.637 MB / 186.7 MB " [Timeout remaining time 179] 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 2.044/2.044, allocations: 429.5 MB / 0.6733 GB, free: 4.047 MB / 0.6355 GB " [Timeout remaining time 177] Using package Buildings with version 14.0.0 (/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: translateModel(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization,tolerance=1e-06,outputFormat="mat",numberOfIntervals=2500,variableFilter="time|vol1.T_start|vol1.T|vol1.ports.[0-9,]+..h_outflow|pipe1.port_b.h_outflow",fileNamePrefix="Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization") translateModel(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization,tolerance=1e-06,outputFormat="mat",numberOfIntervals=2500,variableFilter="time|vol1.T_start|vol1.T|vol1.ports.[0-9,]+..h_outflow|pipe1.port_b.h_outflow",fileNamePrefix="Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization") [Timeout 300] "Notification: Performance of FrontEnd - loaded program: time 1.523e-06/1.523e-06, allocations: 0 / 0.8782 GB, free: 6.176 MB / 0.8386 GB Notification: Performance of FrontEnd - Absyn->SCode: time 1.725e-05/1.878e-05, allocations: 5.266 kB / 0.8782 GB, free: 6.172 MB / 0.8386 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization): time 0.1268/0.1268, allocations: 150.3 MB / 1.025 GB, free: 15.35 MB / 0.9948 GB Notification: Performance of NFInst.instExpressions: time 0.008007/0.1348, allocations: 6.771 MB / 1.032 GB, free: 8.566 MB / 0.9948 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0007366/0.1355, allocations: 51.56 kB / 1.032 GB, free: 8.516 MB / 0.9948 GB Notification: Performance of NFTyping.typeComponents: time 0.0007575/0.1363, allocations: 282 kB / 1.032 GB, free: 8.238 MB / 0.9948 GB Notification: Performance of NFTyping.typeBindings: time 0.002553/0.1388, allocations: 1.469 MB / 1.033 GB, free: 6.762 MB / 0.9948 GB Notification: Performance of NFTyping.typeClassSections: time 0.003089/0.1419, allocations: 1.987 MB / 1.035 GB, free: 4.77 MB / 0.9948 GB Notification: Performance of NFFlatten.flatten: time 0.002403/0.1443, allocations: 2.766 MB / 1.038 GB, free: 1.996 MB / 0.9948 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0007141/0.145, allocations: 0.628 MB / 1.039 GB, free: 1.355 MB / 0.9948 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002067/0.1471, allocations: 1.53 MB / 1.04 GB, free: 15.84 MB / 1.01 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001028/0.1481, allocations: 0.9818 MB / 1.041 GB, free: 14.86 MB / 1.01 GB Notification: Performance of NFPackage.collectConstants: time 0.0001469/0.1483, allocations: 92 kB / 1.041 GB, free: 14.77 MB / 1.01 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001445/0.1497, allocations: 1.037 MB / 1.042 GB, free: 13.73 MB / 1.01 GB Notification: Performance of NFScalarize.scalarize: time 0.0003247/0.1501, allocations: 482.7 kB / 1.043 GB, free: 13.25 MB / 1.01 GB Notification: Performance of NFVerifyModel.verify: time 0.0003428/0.1504, allocations: 415.1 kB / 1.043 GB, free: 12.85 MB / 1.01 GB Notification: Performance of NFConvertDAE.convert: time 0.001748/0.1521, allocations: 1.737 MB / 1.045 GB, free: 11.11 MB / 1.01 GB Notification: Performance of FrontEnd - DAE generated: time 3.616e-06/0.1521, allocations: 0 / 1.045 GB, free: 11.11 MB / 1.01 GB Notification: Performance of FrontEnd: time 8.92e-07/0.1521, allocations: 0 / 1.045 GB, free: 11.11 MB / 1.01 GB Notification: Performance of Transformations before backend: time 1.002e-05/0.1522, allocations: 0 / 1.045 GB, free: 11.11 MB / 1.01 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 173 * Number of variables: 173 Notification: Performance of Generate backend data structure: time 0.001958/0.1541, allocations: 1.579 MB / 1.046 GB, free: 9.48 MB / 1.01 GB Notification: Performance of prepare preOptimizeDAE: time 3.777e-05/0.1542, allocations: 12.03 kB / 1.046 GB, free: 9.469 MB / 1.01 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0009946/0.1551, allocations: 386.7 kB / 1.047 GB, free: 9.09 MB / 1.01 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0008349/0.156, allocations: 0.7808 MB / 1.047 GB, free: 8.281 MB / 1.01 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 3.807e-05/0.156, allocations: 57.28 kB / 1.047 GB, free: 8.227 MB / 1.01 GB Notification: Performance of preOpt expandDerOperator (simulation): time 8.312e-05/0.1561, allocations: 67.98 kB / 1.047 GB, free: 8.16 MB / 1.01 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.0008355/0.1569, allocations: 0.7418 MB / 1.048 GB, free: 7.359 MB / 1.01 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.699e-05/0.157, allocations: 0 / 1.048 GB, free: 7.359 MB / 1.01 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 5.048e-05/0.157, allocations: 27.98 kB / 1.048 GB, free: 7.332 MB / 1.01 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 7.247e-05/0.1571, allocations: 73.95 kB / 1.048 GB, free: 7.262 MB / 1.01 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0006302/0.1577, allocations: 383.7 kB / 1.049 GB, free: 6.883 MB / 1.01 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 0.002865/0.1606, allocations: 2.054 MB / 1.051 GB, free: 4.789 MB / 1.01 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0005364/0.1611, allocations: 322.2 kB / 1.051 GB, free: 4.465 MB / 1.01 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0002097/0.1613, allocations: 156.2 kB / 1.051 GB, free: 4.312 MB / 1.01 GB Notification: Performance of preOpt evalFunc (simulation): time 8.944e-05/0.1614, allocations: 28.48 kB / 1.051 GB, free: 4.285 MB / 1.01 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.005e-05/0.1614, allocations: 49.83 kB / 1.051 GB, free: 4.227 MB / 1.01 GB Notification: Performance of pre-optimization done (n=62): time 2.275e-06/0.1614, allocations: 4 kB / 1.051 GB, free: 4.223 MB / 1.01 GB Notification: Performance of matching and sorting (n=62): time 0.0008663/0.1623, allocations: 0.5161 MB / 1.052 GB, free: 3.703 MB / 1.01 GB Notification: Performance of inlineWhenForInitialization (initialization): time 5.087e-05/0.1624, allocations: 111.3 kB / 1.052 GB, free: 3.57 MB / 1.01 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.00049/0.1629, allocations: 0.6556 MB / 1.052 GB, free: 2.902 MB / 1.01 GB Notification: Performance of collectPreVariables (initialization): time 4.102e-05/0.1629, allocations: 37.7 kB / 1.053 GB, free: 2.859 MB / 1.01 GB Notification: Performance of collectInitialEqns (initialization): time 0.0002306/0.1631, allocations: 491.2 kB / 1.053 GB, free: 2.371 MB / 1.01 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001331/0.1633, allocations: 230.1 kB / 1.053 GB, free: 2.145 MB / 1.01 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001673/0.1634, allocations: 152.3 kB / 1.053 GB, free: 1.988 MB / 1.01 GB Notification: Performance of setup shared object (initialization): time 0.0003174/0.1637, allocations: 0.5664 MB / 1.054 GB, free: 1.41 MB / 1.01 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002084/0.1639, allocations: 119.6 kB / 1.054 GB, free: 1.289 MB / 1.01 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0003228/0.1643, allocations: 436.9 kB / 1.054 GB, free: 0.7773 MB / 1.01 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.000471/0.1647, allocations: 389.2 kB / 1.055 GB, free: 360 kB / 1.01 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.606e-06/0.1647, allocations: 0 / 1.055 GB, free: 360 kB / 1.01 GB Notification: Performance of matching and sorting (n=88) (initialization): time 0.4931/0.6578, allocations: 0.5286 MB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of prepare postOptimizeDAE: time 2.781e-05/0.6578, allocations: 5.844 kB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.158e-05/0.6579, allocations: 6.828 kB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.174e-05/0.6579, allocations: 5.812 kB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000439/0.6583, allocations: 151.6 kB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.282e-05/0.6583, allocations: 7.156 kB / 1.055 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.000508/0.6588, allocations: 69.28 kB / 1.056 GB, free: 74.33 MB / 1.01 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.13e-05/0.6589, allocations: 31.48 kB / 1.056 GB, free: 74.33 MB / 1.01 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0003606/0.6592, allocations: 242 kB / 1.056 GB, free: 74.2 MB / 1.01 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0002727/0.6595, allocations: 441.5 kB / 1.056 GB, free: 73.85 MB / 1.01 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0004177/0.6599, allocations: 394.1 kB / 1.057 GB, free: 73.71 MB / 1.01 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 3.927e-06/0.6599, allocations: 0 / 1.057 GB, free: 73.71 MB / 1.01 GB Notification: Performance of matching and sorting (n=88) (initialization_lambda0): time 0.0006766/0.6606, allocations: 0.5197 MB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of prepare postOptimizeDAE: time 1.206e-05/0.6606, allocations: 5.25 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.4e-06/0.6606, allocations: 5.969 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt tearingSystem (initialization): time 6.171e-06/0.6606, allocations: 5.844 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003453/0.661, allocations: 148.1 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 6.713e-06/0.661, allocations: 9.594 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0003276/0.6613, allocations: 68.64 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.632e-05/0.6614, allocations: 30.75 kB / 1.057 GB, free: 73.66 MB / 1.01 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 10 * 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 (88): * Single equations (assignments): 88 * 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 0.0001536/0.6615, allocations: 310.4 kB / 1.058 GB, free: 73.39 MB / 1.01 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001033/0.6616, allocations: 104.2 kB / 1.058 GB, free: 73.39 MB / 1.01 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0005895/0.6622, allocations: 466.7 kB / 1.058 GB, free: 73.34 MB / 1.01 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.761e-06/0.6622, allocations: 5.406 kB / 1.058 GB, free: 73.34 MB / 1.01 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 5.2e-06/0.6622, allocations: 3.438 kB / 1.058 GB, free: 73.34 MB / 1.01 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0003732/0.6626, allocations: 415.8 kB / 1.059 GB, free: 73.16 MB / 1.01 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001445/0.664, allocations: 1.376 MB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.787e-06/0.664, allocations: 3.547 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0003439/0.6644, allocations: 130.7 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt tearingSystem (simulation): time 6.202e-06/0.6644, allocations: 8.625 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 3.797e-05/0.6644, allocations: 16.8 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 4.729e-06/0.6644, allocations: 10.19 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.396e-06/0.6644, allocations: 11.12 kB / 1.06 GB, free: 72.71 MB / 1.01 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0007686/0.6652, allocations: 0.8321 MB / 1.061 GB, free: 72.29 MB / 1.01 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0001934/0.6654, allocations: 158.7 kB / 1.061 GB, free: 72.25 MB / 1.01 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 6.927e-05/0.6655, allocations: 18.56 kB / 1.061 GB, free: 72.25 MB / 1.01 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0002545/0.6657, allocations: 24.12 kB / 1.061 GB, free: 72.25 MB / 1.01 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 6.212e-05/0.6658, allocations: 50.67 kB / 1.061 GB, free: 72.24 MB / 1.01 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.634e-05/0.6658, allocations: 20.86 kB / 1.061 GB, free: 72.24 MB / 1.01 GB Notification: Performance of sorting global known variables: time 0.0002811/0.6661, allocations: 423.7 kB / 1.062 GB, free: 72.1 MB / 1.01 GB Notification: Performance of sort global known variables: time 8e-08/0.6661, allocations: 2.281 kB / 1.062 GB, free: 72.1 MB / 1.01 GB Notification: Performance of remove unused functions: time 0.001047/0.6671, allocations: 0.6706 MB / 1.062 GB, free: 72.07 MB / 1.01 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 15 * Number of states: 3 (vol1.dynBal.medium.Xi[1],vol1.dynBal.U,vol1.dynBal.m) * 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 (64): * Single equations (assignments): 64 * 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 0.0005785/0.6677, allocations: 389.5 kB / 1.063 GB, free: 71.98 MB / 1.01 GB Notification: Performance of simCode: created initialization part: time 0.0008464/0.6686, allocations: 0.6161 MB / 1.063 GB, free: 71.94 MB / 1.01 GB Notification: Performance of simCode: created event and clocks part: time 4.679e-06/0.6686, allocations: 0 / 1.063 GB, free: 71.94 MB / 1.01 GB Notification: Performance of simCode: created simulation system equations: time 0.0002063/0.6688, allocations: 205.1 kB / 1.063 GB, free: 71.93 MB / 1.01 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001157/0.6699, allocations: 486.6 kB / 1.064 GB, free: 71.9 MB / 1.01 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002125/0.6721, allocations: 1.668 MB / 1.066 GB, free: 71.09 MB / 1.01 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0001377/0.6722, allocations: 237.1 kB / 1.066 GB, free: 71.01 MB / 1.01 GB Notification: Performance of simCode: alias equations: time 0.0007014/0.6729, allocations: 348.1 kB / 1.066 GB, free: 70.99 MB / 1.01 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001774/0.6731, allocations: 72.53 kB / 1.066 GB, free: 70.98 MB / 1.01 GB Notification: Performance of SimCode: time 2.284e-06/0.6731, allocations: 0.8438 kB / 1.066 GB, free: 70.98 MB / 1.01 GB Notification: Performance of Templates: time 0.0277/0.7008, allocations: 21.33 MB / 1.087 GB, free: 69.03 MB / 1.01 GB " [Timeout remaining time 299] make -j1 -f Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.makefile [Timeout 300] (rm -f Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.pipe ; mkfifo Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.pipe ; head -c 1048576 < Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.pipe >> ../files/Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.sim & ./Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization -abortSlowSimulation -alarm=240 -emit_protected -lv LOG_STATS > Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization.pipe 2>&1) [Timeout 240] diffSimulationResults("Buildings_latest_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeInitialization_res.mat","/mnt/ReferenceFiles/Buildings/csv/master/Buildings_Fluid_MixingVolumes_Validation_MixingVolumeInitialization.csv","",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300] "" [Timeout remaining time 300] Reference file matches [Calling sys.exit(0), Time elapsed: 6.421683527994901]