Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.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 0.001867/0.001867, allocations: 110.4 kB / 18.94 MB, free: 2.793 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 0.002705/0.002705, allocations: 222.4 kB / 22.25 MB, free: 5.211 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 1.562/1.562, allocations: 230.6 MB / 256 MB, free: 8.012 MB / 206.1 MB
"
[Timeout remaining time 178]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.1.1-maint.11.x/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.1.1-maint.11.x/package.mo): time 3.007/3.007, allocations: 476.7 MB / 0.7707 GB, free: 4.289 MB / 0.6231 GB
"
[Timeout remaining time 176]
Using package Buildings with version 11.1.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.1.1-maint.11.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.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan,fileNamePrefix="Buildings_11_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_ReturnFan",fmuType="me",version="2.0",platforms={"static"})
"" <> buildModelFMU(Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan,fileNamePrefix="Buildings_11_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_ReturnFan",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 0.002006/0.002006, allocations: 66.75 kB / 1.118 GB, free: 40.48 MB / 0.9044 GB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.3752/0.3772, allocations: 170 MB / 1.283 GB, free: 11.73 MB / 0.9825 GB
Notification: Performance of NFInst.instantiate(Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan): time 0.004568/0.3818, allocations: 1.185 MB / 1.285 GB, free: 10.54 MB / 0.9825 GB
Notification: Performance of NFInst.instExpressions: time 0.002295/0.3841, allocations: 1.034 MB / 1.286 GB, free: 9.496 MB / 0.9825 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.0002634/0.3843, allocations: 7.938 kB / 1.286 GB, free: 9.488 MB / 0.9825 GB
Notification: Performance of NFTyping.typeComponents: time 0.000225/0.3846, allocations: 31.66 kB / 1.286 GB, free: 9.457 MB / 0.9825 GB
Notification: Performance of NFTyping.typeBindings: time 9.148e-05/0.3847, allocations: 27.73 kB / 1.286 GB, free: 9.43 MB / 0.9825 GB
Notification: Performance of NFTyping.typeClassSections: time 0.0003986/0.3851, allocations: 107.8 kB / 1.286 GB, free: 9.324 MB / 0.9825 GB
Notification: Performance of NFFlatten.flatten: time 0.0004589/0.3855, allocations: 247.4 kB / 1.286 GB, free: 9.082 MB / 0.9825 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.0003053/0.3858, allocations: 92.89 kB / 1.286 GB, free: 8.988 MB / 0.9825 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.000146/0.386, allocations: 83.66 kB / 1.286 GB, free: 8.906 MB / 0.9825 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.000153/0.3861, allocations: 95.55 kB / 1.286 GB, free: 8.812 MB / 0.9825 GB
Notification: Performance of NFPackage.collectConstants: time 5.142e-05/0.3862, allocations: 24 kB / 1.286 GB, free: 8.789 MB / 0.9825 GB
Notification: Performance of NFFlatten.collectFunctions: time 4.095e-05/0.3862, allocations: 24 kB / 1.286 GB, free: 8.766 MB / 0.9825 GB
Notification: Performance of NFScalarize.scalarize: time 6.947e-05/0.3863, allocations: 51.84 kB / 1.286 GB, free: 8.715 MB / 0.9825 GB
Notification: Performance of NFVerifyModel.verify: time 0.0001433/0.3864, allocations: 103.5 kB / 1.287 GB, free: 8.613 MB / 0.9825 GB
Notification: Performance of NFConvertDAE.convert: time 0.0004535/0.3869, allocations: 334.6 kB / 1.287 GB, free: 8.285 MB / 0.9825 GB
Notification: Performance of FrontEnd - DAE generated: time 6.642e-06/0.3869, allocations: 0 / 1.287 GB, free: 8.285 MB / 0.9825 GB
Notification: Performance of FrontEnd: time 2.214e-06/0.3869, allocations: 3.938 kB / 1.287 GB, free: 8.281 MB / 0.9825 GB
Notification: Performance of Transformations before backend: time 9.178e-06/0.3869, allocations: 0 / 1.287 GB, free: 8.281 MB / 0.9825 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 48
 * Number of variables: 48
Notification: Performance of Generate backend data structure: time 0.0009842/0.3879, allocations: 433.8 kB / 1.287 GB, free: 7.82 MB / 0.9825 GB
Notification: Performance of prepare preOptimizeDAE: time 5.812e-05/0.3879, allocations: 8.031 kB / 1.287 GB, free: 7.812 MB / 0.9825 GB
Notification: Performance of preOpt introduceOutputAliases (simulation): time 8.654e-05/0.388, allocations: 62.72 kB / 1.287 GB, free: 7.742 MB / 0.9825 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 6.591e-05/0.3881, allocations: 28.75 kB / 1.287 GB, free: 7.715 MB / 0.9825 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.0006284/0.3887, allocations: 214.5 kB / 1.288 GB, free: 7.48 MB / 0.9825 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 3.679e-05/0.3888, allocations: 16.81 kB / 1.288 GB, free: 7.465 MB / 0.9825 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 3.517e-05/0.3888, allocations: 16.38 kB / 1.288 GB, free: 7.449 MB / 0.9825 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.0005858/0.3894, allocations: 226.3 kB / 1.288 GB, free: 7.219 MB / 0.9825 GB
Notification: Performance of preOpt findStateOrder (simulation): time 1.635e-05/0.3894, allocations: 3.938 kB / 1.288 GB, free: 7.215 MB / 0.9825 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 2.571e-05/0.3894, allocations: 4 kB / 1.288 GB, free: 7.211 MB / 0.9825 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.378e-05/0.3894, allocations: 12 kB / 1.288 GB, free: 7.199 MB / 0.9825 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.000402/0.3898, allocations: 161 kB / 1.288 GB, free: 7.043 MB / 0.9825 GB
Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.001294/0.3911, allocations: 0.6704 MB / 1.289 GB, free: 6.316 MB / 0.9825 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.0002314/0.3914, allocations: 90.53 kB / 1.289 GB, free: 6.219 MB / 0.9825 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0001285/0.3915, allocations: 44.83 kB / 1.289 GB, free: 6.172 MB / 0.9825 GB
Notification: Performance of preOpt evalFunc (simulation): time 2.964e-05/0.3915, allocations: 0 / 1.289 GB, free: 6.172 MB / 0.9825 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.624e-05/0.3916, allocations: 42.48 kB / 1.289 GB, free: 6.121 MB / 0.9825 GB
Notification: Performance of pre-optimization done (n=10): time 1.583e-06/0.3916, allocations: 0 / 1.289 GB, free: 6.121 MB / 0.9825 GB
Notification: Performance of matching and sorting (n=10): time 0.00052/0.3921, allocations: 161.7 kB / 1.289 GB, free: 5.957 MB / 0.9825 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 6.241e-05/0.3922, allocations: 59.41 kB / 1.289 GB, free: 5.887 MB / 0.9825 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0002696/0.3924, allocations: 224.1 kB / 1.289 GB, free: 5.66 MB / 0.9825 GB
Notification: Performance of collectPreVariables (initialization): time 3.241e-05/0.3925, allocations: 29.64 kB / 1.289 GB, free: 5.625 MB / 0.9825 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0001451/0.3926, allocations: 160.1 kB / 1.289 GB, free: 5.465 MB / 0.9825 GB
Notification: Performance of collectInitialBindings (initialization): time 3.823e-05/0.3926, allocations: 35.69 kB / 1.289 GB, free: 5.43 MB / 0.9825 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 7.734e-05/0.3927, allocations: 33.72 kB / 1.289 GB, free: 5.391 MB / 0.9825 GB
Notification: Performance of setup shared object (initialization): time 0.0001797/0.3929, allocations: 330.8 kB / 1.29 GB, free: 5.059 MB / 0.9825 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0001354/0.393, allocations: 47.97 kB / 1.29 GB, free: 5.012 MB / 0.9825 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0001825/0.3932, allocations: 81.12 kB / 1.29 GB, free: 4.914 MB / 0.9825 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0002942/0.3935, allocations: 144.2 kB / 1.29 GB, free: 4.758 MB / 0.9825 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.066e-06/0.3935, allocations: 0 / 1.29 GB, free: 4.758 MB / 0.9825 GB
Notification: Performance of matching and sorting (n=18) (initialization): time 0.0004066/0.3939, allocations: 193.4 kB / 1.29 GB, free: 4.562 MB / 0.9825 GB
Notification: Performance of prepare postOptimizeDAE: time 2.878e-05/0.3939, allocations: 11.88 kB / 1.29 GB, free: 4.551 MB / 0.9825 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.161e-05/0.394, allocations: 4 kB / 1.29 GB, free: 4.547 MB / 0.9825 GB
Notification: Performance of postOpt tearingSystem (initialization): time 2.513e-05/0.394, allocations: 0 / 1.29 GB, free: 4.547 MB / 0.9825 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0002035/0.3942, allocations: 39.91 kB / 1.29 GB, free: 4.508 MB / 0.9825 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 9.017e-06/0.3942, allocations: 0 / 1.29 GB, free: 4.508 MB / 0.9825 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0001124/0.3943, allocations: 15.89 kB / 1.29 GB, free: 4.492 MB / 0.9825 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 1.958e-05/0.3943, allocations: 12.16 kB / 1.29 GB, free: 4.48 MB / 0.9825 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 6
 * 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 (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 prepare postOptimizeDAE: time 0.0001623/0.3945, allocations: 141.7 kB / 1.29 GB, free: 4.332 MB / 0.9825 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 4.451e-05/0.3945, allocations: 19.84 kB / 1.29 GB, free: 4.312 MB / 0.9825 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0004105/0.3949, allocations: 151 kB / 1.291 GB, free: 4.16 MB / 0.9825 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.288e-06/0.3949, allocations: 4 kB / 1.291 GB, free: 4.156 MB / 0.9825 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 5.33e-06/0.395, allocations: 384 / 1.291 GB, free: 4.156 MB / 0.9825 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.783e-06/0.395, allocations: 3.984 kB / 1.291 GB, free: 4.152 MB / 0.9825 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0008349/0.3958, allocations: 0.4919 MB / 1.291 GB, free: 3.602 MB / 0.9825 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.929e-06/0.3958, allocations: 3.984 kB / 1.291 GB, free: 3.598 MB / 0.9825 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001144/0.3959, allocations: 27.98 kB / 1.291 GB, free: 3.57 MB / 0.9825 GB
Notification: Performance of postOpt tearingSystem (simulation): time 5.511e-06/0.3959, allocations: 4 kB / 1.291 GB, free: 3.566 MB / 0.9825 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 1.221e-05/0.3959, allocations: 3.938 kB / 1.291 GB, free: 3.562 MB / 0.9825 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 2.414e-06/0.3959, allocations: 4.094 kB / 1.291 GB, free: 3.559 MB / 0.9825 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.753e-06/0.3959, allocations: 4 kB / 1.291 GB, free: 3.555 MB / 0.9825 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0004274/0.3964, allocations: 257.9 kB / 1.291 GB, free: 3.277 MB / 0.9825 GB
Notification: Performance of postOpt removeConstants (simulation): time 3.774e-05/0.3964, allocations: 23.84 kB / 1.291 GB, free: 3.254 MB / 0.9825 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 2.57e-05/0.3964, allocations: 4 kB / 1.291 GB, free: 3.25 MB / 0.9825 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0001466/0.3966, allocations: 19.97 kB / 1.291 GB, free: 3.23 MB / 0.9825 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 5.908e-05/0.3966, allocations: 11.97 kB / 1.291 GB, free: 3.219 MB / 0.9825 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 1.304e-05/0.3966, allocations: 7.938 kB / 1.291 GB, free: 3.211 MB / 0.9825 GB
Notification: Performance of sorting global known variables: time 0.0001747/0.3968, allocations: 155.5 kB / 1.292 GB, free: 3.059 MB / 0.9825 GB
Notification: Performance of sort global known variables: time 1e-07/0.3968, allocations: 0 / 1.292 GB, free: 3.059 MB / 0.9825 GB
Notification: Performance of remove unused functions: time 0.0003173/0.3971, allocations: 35.95 kB / 1.292 GB, free: 3.023 MB / 0.9825 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 4
 * 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 (12):
 * Single equations (assignments): 12
 * 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 0.0007907/0.3979, allocations: 0.8045 MB / 1.292 GB, free: 2.18 MB / 0.9825 GB
Notification: Performance of simCode: created initialization part: time 0.000365/0.3983, allocations: 111.8 kB / 1.293 GB, free: 2.07 MB / 0.9825 GB
Notification: Performance of simCode: created event and clocks part: time 2.364e-06/0.3983, allocations: 0 / 1.293 GB, free: 2.07 MB / 0.9825 GB
Notification: Performance of simCode: created simulation system equations: time 0.0001358/0.3984, allocations: 51.91 kB / 1.293 GB, free: 2.02 MB / 0.9825 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0004343/0.3989, allocations: 45.23 kB / 1.293 GB, free: 1.977 MB / 0.9825 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003077/0.4019, allocations: 2.05 MB / 1.295 GB, free: 15.8 MB / 0.9981 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0004498/0.4024, allocations: 0.7359 MB / 1.295 GB, free: 15.04 MB / 0.9981 GB
Notification: Performance of simCode: alias equations: time 0.0001145/0.4025, allocations: 21.64 kB / 1.295 GB, free: 15.02 MB / 0.9981 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000136/0.4026, allocations: 67.41 kB / 1.295 GB, free: 14.95 MB / 0.9981 GB
Notification: Performance of SimCode: time 1.513e-06/0.4026, allocations: 0 / 1.295 GB, free: 14.95 MB / 0.9981 GB
Notification: Performance of buildModelFMU: Generate the FMI files: time 0.04142/0.4441, allocations: 3.826 MB / 1.299 GB, free: 11.33 MB / 0.9981 GB
Notification: Performance of buildModelFMU: Generate platform static: time 11.45/11.89, allocations: 7.469 kB / 1.299 GB, free: 11.32 MB / 0.9981 GB
"
[Timeout remaining time 287]
(rm -f Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.pipe ; mkfifo Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.pipe ; head -c 1048576 < Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.pipe >> ../files/Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan_res.mat --tempDir=temp_Buildings_11_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_ReturnFan_fmu --startTime=0 --stopTime=1800 --stepSize=0.72 --timeout=400 --tolerance=1e-06 Buildings_11_Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_ReturnFan.fmu > Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.pipe 2>&1) [Timeout 420.0]
diffSimulationResults("Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan_res.mat","/mnt/ReferenceFiles/Buildings/csv/maint_11.x/Buildings_Controls_OBC_ASHRAE_G36_AHUs_MultiZone_VAV_Economizers_Subsequences_Modulations_Validation_ReturnFan.csv","/var/lib/jenkins1/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_11_Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.Validation.ReturnFan.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: 19.029962426051497]