Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.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 0.0007872/0.0007872, allocations: 80.94 kB / 20.73 MB, free: 3.754 MB / 18.57 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 0.001042/0.001042, allocations: 169 kB / 24.15 MB, free: 344 kB / 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 0.9718/0.9718, allocations: 177.1 MB / 204.6 MB, free: 5.484 MB / 186.7 MB
"
[Timeout remaining time 179]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA master/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA master/package.mo): time 0.64/0.64, allocations: 115 MB / 376 MB, free: 7.477 MB / 346.7 MB
"
[Timeout remaining time 179]
Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 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(IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow")
translateModel(IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow") [Timeout 660]
"Notification: Performance of FrontEnd - loaded program: time 1.192e-06/1.192e-06, allocations: 0 / 428.7 MB, free: 2.762 MB / 394.7 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 1.493e-05/1.612e-05, allocations: 2.312 kB / 428.8 MB, free: 2.758 MB / 394.7 MB
Notification: Performance of NFInst.instantiate(IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow): time 0.3564/0.3564, allocations: 159.1 MB / 0.5741 GB, free: 6.555 MB / 0.5105 GB
Notification: Performance of NFInst.instExpressions: time 0.01469/0.3711, allocations: 10.59 MB / 0.5844 GB, free: 11.98 MB / 0.5261 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.001876/0.373, allocations: 107.2 kB / 0.5845 GB, free: 11.88 MB / 0.5261 GB
Notification: Performance of NFTyping.typeComponents: time 0.003262/0.3762, allocations: 1.64 MB / 0.5861 GB, free: 10.23 MB / 0.5261 GB
Notification: Performance of NFTyping.typeBindings: time 0.003658/0.3799, allocations: 2.163 MB / 0.5882 GB, free: 8.062 MB / 0.5261 GB
Notification: Performance of NFTyping.typeClassSections: time 0.003408/0.3833, allocations: 2.227 MB / 0.5904 GB, free: 5.84 MB / 0.5261 GB
Notification: Performance of NFFlatten.flatten: time 0.00657/0.3899, allocations: 7.785 MB / 0.598 GB, free: 14.04 MB / 0.5417 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.001653/0.3915, allocations: 1.428 MB / 0.5994 GB, free: 12.58 MB / 0.5417 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.002437/0.394, allocations: 2.71 MB / 0.6021 GB, free: 9.902 MB / 0.5417 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.001177/0.3951, allocations: 1.109 MB / 0.6031 GB, free: 8.793 MB / 0.5417 GB
Notification: Performance of NFPackage.collectConstants: time 0.0001682/0.3953, allocations: 188 kB / 0.6033 GB, free: 8.609 MB / 0.5417 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.001042/0.3963, allocations: 0.8499 MB / 0.6042 GB, free: 7.758 MB / 0.5417 GB
Notification: Performance of NFScalarize.scalarize: time 0.000428/0.3968, allocations: 0.775 MB / 0.6049 GB, free: 6.98 MB / 0.5417 GB
Notification: Performance of NFVerifyModel.verify: time 0.0005723/0.3973, allocations: 0.7717 MB / 0.6057 GB, free: 6.207 MB / 0.5417 GB
Notification: Performance of NFConvertDAE.convert: time 0.001829/0.3992, allocations: 2.153 MB / 0.6078 GB, free: 4.047 MB / 0.5417 GB
Notification: Performance of FrontEnd - DAE generated: time 3.687e-06/0.3992, allocations: 0 / 0.6078 GB, free: 4.047 MB / 0.5417 GB
Notification: Performance of FrontEnd: time 1.322e-06/0.3992, allocations: 0 / 0.6078 GB, free: 4.047 MB / 0.5417 GB
Notification: Performance of Transformations before backend: time 1.921e-05/0.3992, allocations: 0 / 0.6078 GB, free: 4.047 MB / 0.5417 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 277
 * Number of variables: 277
Notification: Performance of Generate backend data structure: time 0.002052/0.4012, allocations: 2.505 MB / 0.6102 GB, free: 1.492 MB / 0.5417 GB
Notification: Performance of prepare preOptimizeDAE: time 3.143e-05/0.4013, allocations: 8.031 kB / 0.6102 GB, free: 1.484 MB / 0.5417 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001542/0.4028, allocations: 0.6276 MB / 0.6108 GB, free: 0.8555 MB / 0.5417 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.004796/0.4076, allocations: 4.429 MB / 0.6152 GB, free: 12.32 MB / 0.5573 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.986e-05/0.4077, allocations: 97.86 kB / 0.6153 GB, free: 12.23 MB / 0.5573 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.000103/0.4078, allocations: 116.9 kB / 0.6154 GB, free: 12.11 MB / 0.5573 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001266/0.409, allocations: 1.131 MB / 0.6165 GB, free: 10.81 MB / 0.5573 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.273e-05/0.4091, allocations: 3.938 kB / 0.6165 GB, free: 10.8 MB / 0.5573 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.318e-05/0.4091, allocations: 55.94 kB / 0.6165 GB, free: 10.75 MB / 0.5573 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.574e-05/0.4092, allocations: 38 kB / 0.6166 GB, free: 10.71 MB / 0.5573 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0004161/0.4096, allocations: 331.9 kB / 0.6169 GB, free: 10.39 MB / 0.5573 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 0.003685/0.4133, allocations: 5.189 MB / 0.622 GB, free: 5.004 MB / 0.5573 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.0002366/0.4135, allocations: 126.7 kB / 0.6221 GB, free: 4.875 MB / 0.5573 GB
Notification: Performance of preOpt resolveLoops (simulation): time 5.586e-05/0.4136, allocations: 41.7 kB / 0.6221 GB, free: 4.832 MB / 0.5573 GB
Notification: Performance of preOpt evalFunc (simulation): time 8.502e-05/0.4136, allocations: 20 kB / 0.6221 GB, free: 4.812 MB / 0.5573 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 2.213e-05/0.4137, allocations: 38.55 kB / 0.6222 GB, free: 4.766 MB / 0.5573 GB
Notification: Performance of pre-optimization done (n=18): time 1.463e-06/0.4137, allocations: 0 / 0.6222 GB, free: 4.766 MB / 0.5573 GB
Notification: Performance of matching and sorting (n=18): time 0.0004145/0.4141, allocations: 231.3 kB / 0.6224 GB, free: 4.535 MB / 0.5573 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 3.597e-05/0.4141, allocations: 59.31 kB / 0.6224 GB, free: 4.465 MB / 0.5573 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001182/0.4153, allocations: 1.449 MB / 0.6239 GB, free: 2.98 MB / 0.5573 GB
Notification: Performance of collectPreVariables (initialization): time 2.851e-05/0.4153, allocations: 33.7 kB / 0.6239 GB, free: 2.941 MB / 0.5573 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0003502/0.4157, allocations: 0.7522 MB / 0.6246 GB, free: 2.18 MB / 0.5573 GB
Notification: Performance of collectInitialBindings (initialization): time 4.349e-05/0.4157, allocations: 75.45 kB / 0.6247 GB, free: 2.105 MB / 0.5573 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001521/0.4159, allocations: 174.4 kB / 0.6249 GB, free: 1.93 MB / 0.5573 GB
Notification: Performance of setup shared object (initialization): time 9.115e-05/0.416, allocations: 337.9 kB / 0.6252 GB, free: 1.594 MB / 0.5573 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0001128/0.4161, allocations: 83.64 kB / 0.6253 GB, free: 1.508 MB / 0.5573 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0003268/0.4164, allocations: 0.6537 MB / 0.6259 GB, free: 0.6055 MB / 0.5573 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0004583/0.4169, allocations: 0.6759 MB / 0.6266 GB, free: 15.71 MB / 0.573 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 6.452e-06/0.4169, allocations: 4 kB / 0.6266 GB, free: 15.7 MB / 0.573 GB
Notification: Performance of matching and sorting (n=98) (initialization): time 0.0005788/0.4174, allocations: 0.6037 MB / 0.6272 GB, free: 15.09 MB / 0.573 GB
Notification: Performance of prepare postOptimizeDAE: time 1.932e-05/0.4175, allocations: 12.91 kB / 0.6272 GB, free: 15.08 MB / 0.573 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.348e-05/0.4175, allocations: 16 kB / 0.6272 GB, free: 15.07 MB / 0.573 GB
Notification: Performance of postOpt tearingSystem (initialization): time 2.254e-05/0.4175, allocations: 28.84 kB / 0.6272 GB, free: 15.04 MB / 0.573 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003942/0.4179, allocations: 203.6 kB / 0.6274 GB, free: 14.84 MB / 0.573 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.863e-05/0.4179, allocations: 39.8 kB / 0.6274 GB, free: 14.8 MB / 0.573 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004179/0.4183, allocations: 127.9 kB / 0.6276 GB, free: 14.68 MB / 0.573 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.428e-05/0.4184, allocations: 43.98 kB / 0.6276 GB, free: 14.63 MB / 0.573 GB
Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0002497/0.4186, allocations: 167.8 kB / 0.6278 GB, free: 14.46 MB / 0.573 GB
Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0003078/0.4189, allocations: 0.6449 MB / 0.6284 GB, free: 13.56 MB / 0.573 GB
Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.000435/0.4194, allocations: 0.6752 MB / 0.6291 GB, free: 12.66 MB / 0.573 GB
Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.739e-06/0.4194, allocations: 4 kB / 0.6291 GB, free: 12.66 MB / 0.573 GB
Notification: Performance of matching and sorting (n=98) (initialization_lambda0): time 0.0007188/0.4201, allocations: 0.5943 MB / 0.6296 GB, free: 12.06 MB / 0.573 GB
Notification: Performance of prepare postOptimizeDAE: time 1.235e-05/0.4201, allocations: 12 kB / 0.6297 GB, free: 12.05 MB / 0.573 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.819e-06/0.4201, allocations: 16 kB / 0.6297 GB, free: 12.04 MB / 0.573 GB
Notification: Performance of postOpt tearingSystem (initialization): time 1.247e-05/0.4201, allocations: 23.98 kB / 0.6297 GB, free: 12.01 MB / 0.573 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003444/0.4205, allocations: 208.2 kB / 0.6299 GB, free: 11.81 MB / 0.573 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.546e-05/0.4205, allocations: 31.86 kB / 0.6299 GB, free: 11.78 MB / 0.573 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0003858/0.4209, allocations: 107.4 kB / 0.63 GB, free: 11.67 MB / 0.573 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.766e-05/0.4209, allocations: 40.48 kB / 0.6301 GB, free: 11.63 MB / 0.573 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 72
 * 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 (97):
 * Single equations (assignments): 96
 * Array equations: 1
 * 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 0.000121/0.421, allocations: 243.8 kB / 0.6303 GB, free: 11.39 MB / 0.573 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 9.894e-05/0.4211, allocations: 103.9 kB / 0.6304 GB, free: 11.29 MB / 0.573 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0001523/0.4213, allocations: 149.5 kB / 0.6305 GB, free: 11.13 MB / 0.573 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.528e-06/0.4213, allocations: 4 kB / 0.6305 GB, free: 11.13 MB / 0.573 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 2.184e-06/0.4213, allocations: 0 / 0.6305 GB, free: 11.13 MB / 0.573 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 3.446e-06/0.4213, allocations: 3.938 kB / 0.6305 GB, free: 11.12 MB / 0.573 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001025/0.4223, allocations: 0.9948 MB / 0.6315 GB, free: 10.05 MB / 0.573 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.947e-06/0.4223, allocations: 4 kB / 0.6315 GB, free: 10.04 MB / 0.573 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.000114/0.4224, allocations: 44.47 kB / 0.6316 GB, free: 10 MB / 0.573 GB
Notification: Performance of postOpt tearingSystem (simulation): time 6.442e-06/0.4224, allocations: 15.98 kB / 0.6316 GB, free: 9.984 MB / 0.573 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 1.515e-05/0.4225, allocations: 9.188 kB / 0.6316 GB, free: 9.977 MB / 0.573 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 3.927e-06/0.4225, allocations: 4.547 kB / 0.6316 GB, free: 9.973 MB / 0.573 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.777e-06/0.4225, allocations: 11.94 kB / 0.6316 GB, free: 9.961 MB / 0.573 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0002501/0.4227, allocations: 327.8 kB / 0.6319 GB, free: 9.57 MB / 0.573 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0001765/0.4229, allocations: 182.7 kB / 0.6321 GB, free: 9.391 MB / 0.573 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 9.401e-05/0.423, allocations: 12 kB / 0.6321 GB, free: 9.379 MB / 0.573 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0002627/0.4232, allocations: 27.98 kB / 0.6321 GB, free: 9.352 MB / 0.573 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 2.681e-05/0.4233, allocations: 31.84 kB / 0.6322 GB, free: 9.32 MB / 0.573 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 1.219e-05/0.4233, allocations: 8 kB / 0.6322 GB, free: 9.312 MB / 0.573 GB
Notification: Performance of sorting global known variables: time 0.0005154/0.4238, allocations: 0.7078 MB / 0.6329 GB, free: 8.582 MB / 0.573 GB
Notification: Performance of sort global known variables: time 8e-08/0.4238, allocations: 0 / 0.6329 GB, free: 8.582 MB / 0.573 GB
Notification: Performance of remove unused functions: time 0.001042/0.4248, allocations: 0.7482 MB / 0.6336 GB, free: 7.832 MB / 0.573 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 18
 * 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 (18):
 * Single equations (assignments): 18
 * 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 0.0002423/0.4251, allocations: 163.2 kB / 0.6337 GB, free: 7.668 MB / 0.573 GB
Notification: Performance of simCode: created initialization part: time 0.0005469/0.4256, allocations: 0.5605 MB / 0.6343 GB, free: 7.109 MB / 0.573 GB
Notification: Performance of simCode: created event and clocks part: time 2.212e-05/0.4257, allocations: 28.56 kB / 0.6343 GB, free: 7.082 MB / 0.573 GB
Notification: Performance of simCode: created simulation system equations: time 6.677e-05/0.4257, allocations: 56.64 kB / 0.6344 GB, free: 7.023 MB / 0.573 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001699/0.4274, allocations: 0.9525 MB / 0.6353 GB, free: 6.184 MB / 0.573 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002833/0.4303, allocations: 2.672 MB / 0.6379 GB, free: 3.402 MB / 0.573 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0002807/0.4305, allocations: 400 kB / 0.6383 GB, free: 2.984 MB / 0.573 GB
Notification: Performance of simCode: alias equations: time 0.0007276/0.4313, allocations: 326.8 kB / 0.6386 GB, free: 2.676 MB / 0.573 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001027/0.4323, allocations: 0.6199 MB / 0.6392 GB, free: 2.035 MB / 0.573 GB
Notification: Performance of SimCode: time 1.552e-06/0.4323, allocations: 4 kB / 0.6392 GB, free: 2.031 MB / 0.573 GB
Notification: Performance of Templates: time 0.3101/0.7424, allocations: 32.72 MB / 0.6712 GB, free: 77.83 MB / 0.5886 GB
"
[Timeout remaining time 659]
make -j1 -f IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.makefile [Timeout 660]
(rm -f IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.sim & ./IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow -abortSlowSimulation -alarm=240 -s gbode -gbm=radauIIA3 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.FMI.Validation.HeaterFan_noReverseFlow.pipe 2>&1) [Timeout 240]
[Calling sys.exit(0), Time elapsed: 4.378098538145423]