Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.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 0.0009533/0.0009533, allocations: 92.2 kB / 20.19 MB, free: 4.359 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 0.0009502/0.0009502, allocations: 173 kB / 23.5 MB, free: 1.055 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 0.9712/0.9712, allocations: 177.1 MB / 203.8 MB, free: 5.621 MB / 186.7 MB
"
[Timeout remaining time 179]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/package.mo", uses=false) [Timeout 180]
"[/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/Examples/PPD12/Structure.mo:531:21-535:34:writable] Warning: Lexer treating \\ as \\\\, since \\e is not a valid Modelica escape sequence.
[/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/Examples/PPD12/Structure.mo:531:21-535:42:writable] Warning: Lexer treating \\ as \\\\, since \\< is not a valid Modelica escape sequence.
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/package.mo): time 0.8744/0.8744, allocations: 154.8 MB / 415.1 MB, free: 0.5 MB / 378.7 MB
[/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/Utilities/Cryptographics/BaseClasses/sha.mo:2:1-19:8:writable] Warning: External function annotation should occur on the external-clause, not on the function.
[/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS master/Utilities/File/sha2.mo:2:1-9:9:writable] Warning: External function annotation should occur on the external-clause, not on the function.
"
[Timeout remaining time 179]
Using package IDEAS with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 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(IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate")
translateModel(IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate") [Timeout 660]
"Notification: Performance of FrontEnd - loaded program: time 1.794e-06/1.794e-06, allocations: 0 / 0.5206 GB, free: 2.273 MB / 490.7 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 2.133e-05/2.312e-05, allocations: 2.859 kB / 0.5206 GB, free: 2.27 MB / 490.7 MB
Notification: Performance of NFInst.instantiate(IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate): time 0.4698/0.4699, allocations: 187.7 MB / 0.7039 GB, free: 47.23 MB / 0.6355 GB
Notification: Performance of NFInst.instExpressions: time 0.007328/0.4772, allocations: 5.835 MB / 0.7096 GB, free: 47.14 MB / 0.6355 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.001066/0.4783, allocations: 54.03 kB / 0.7096 GB, free: 47.14 MB / 0.6355 GB
Notification: Performance of NFTyping.typeComponents: time 0.001199/0.4795, allocations: 0.5522 MB / 0.7102 GB, free: 47.13 MB / 0.6355 GB
Notification: Performance of NFTyping.typeBindings: time 0.003054/0.4825, allocations: 1.73 MB / 0.7119 GB, free: 47.05 MB / 0.6355 GB
Notification: Performance of NFTyping.typeClassSections: time 0.002304/0.4848, allocations: 1.266 MB / 0.7131 GB, free: 47.02 MB / 0.6355 GB
Notification: Performance of NFFlatten.flatten: time 0.002662/0.4875, allocations: 2.636 MB / 0.7157 GB, free: 46.7 MB / 0.6355 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.0009651/0.4884, allocations: 0.7857 MB / 0.7164 GB, free: 46.62 MB / 0.6355 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.002187/0.4906, allocations: 1.593 MB / 0.718 GB, free: 46.47 MB / 0.6355 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.001216/0.4918, allocations: 0.8197 MB / 0.7188 GB, free: 46.39 MB / 0.6355 GB
Notification: Performance of NFPackage.collectConstants: time 0.0001351/0.492, allocations: 108.1 kB / 0.7189 GB, free: 46.39 MB / 0.6355 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.001939/0.4939, allocations: 1.299 MB / 0.7202 GB, free: 46.27 MB / 0.6355 GB
Notification: Performance of NFScalarize.scalarize: time 0.0003716/0.4943, allocations: 0.5483 MB / 0.7207 GB, free: 46.21 MB / 0.6355 GB
Notification: Performance of NFVerifyModel.verify: time 0.0004587/0.4947, allocations: 469.7 kB / 0.7211 GB, free: 46.16 MB / 0.6355 GB
Notification: Performance of NFConvertDAE.convert: time 0.003065/0.4978, allocations: 1.697 MB / 0.7228 GB, free: 45.96 MB / 0.6355 GB
Notification: Performance of FrontEnd - DAE generated: time 5.26e-06/0.4978, allocations: 0 / 0.7228 GB, free: 45.96 MB / 0.6355 GB
Notification: Performance of FrontEnd: time 1.383e-06/0.4978, allocations: 1.219 kB / 0.7228 GB, free: 45.96 MB / 0.6355 GB
Notification: Performance of Transformations before backend: time 3.402e-05/0.4979, allocations: 0.875 kB / 0.7228 GB, free: 45.96 MB / 0.6355 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 216
 * Number of variables: 216
Notification: Performance of Generate backend data structure: time 0.002208/0.5001, allocations: 1.586 MB / 0.7243 GB, free: 45.12 MB / 0.6355 GB
Notification: Performance of prepare preOptimizeDAE: time 4.346e-05/0.5001, allocations: 8.156 kB / 0.7244 GB, free: 45.12 MB / 0.6355 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001798/0.5019, allocations: 0.5212 MB / 0.7249 GB, free: 45.01 MB / 0.6355 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001126/0.503, allocations: 0.7953 MB / 0.7256 GB, free: 44.74 MB / 0.6355 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.125e-05/0.5031, allocations: 66.34 kB / 0.7257 GB, free: 44.74 MB / 0.6355 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001236/0.5032, allocations: 94.59 kB / 0.7258 GB, free: 44.74 MB / 0.6355 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001211/0.5044, allocations: 1.183 MB / 0.727 GB, free: 44.07 MB / 0.6355 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.238e-05/0.5044, allocations: 10.12 kB / 0.727 GB, free: 44.07 MB / 0.6355 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 7.122e-05/0.5045, allocations: 40.45 kB / 0.727 GB, free: 44.07 MB / 0.6355 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.756e-05/0.5046, allocations: 32.47 kB / 0.727 GB, free: 44.07 MB / 0.6355 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0007424/0.5053, allocations: 398 kB / 0.7274 GB, free: 44.05 MB / 0.6355 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 0.003733/0.509, allocations: 2.968 MB / 0.7303 GB, free: 42.93 MB / 0.6355 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.0005991/0.5096, allocations: 327.9 kB / 0.7306 GB, free: 42.89 MB / 0.6355 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0002299/0.5099, allocations: 134.3 kB / 0.7307 GB, free: 42.88 MB / 0.6355 GB
Notification: Performance of preOpt evalFunc (simulation): time 0.0001351/0.51, allocations: 28.88 kB / 0.7308 GB, free: 42.88 MB / 0.6355 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.373e-05/0.51, allocations: 45.7 kB / 0.7308 GB, free: 42.83 MB / 0.6355 GB
Notification: Performance of pre-optimization done (n=43): time 3.346e-06/0.51, allocations: 0.9375 kB / 0.7308 GB, free: 42.83 MB / 0.6355 GB
Notification: Performance of matching and sorting (n=45): time 0.002048/0.5121, allocations: 1.01 MB / 0.7318 GB, free: 42.45 MB / 0.6355 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 3.036e-05/0.5121, allocations: 57.16 kB / 0.7319 GB, free: 42.39 MB / 0.6355 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0006664/0.5128, allocations: 0.6418 MB / 0.7325 GB, free: 42.19 MB / 0.6355 GB
Notification: Performance of collectPreVariables (initialization): time 5.083e-05/0.5128, allocations: 37.61 kB / 0.7325 GB, free: 42.16 MB / 0.6355 GB
Notification: Performance of collectInitialEqns (initialization): time 0.000302/0.5131, allocations: 0.5583 MB / 0.7331 GB, free: 41.85 MB / 0.6355 GB
Notification: Performance of collectInitialBindings (initialization): time 0.0001195/0.5133, allocations: 172.6 kB / 0.7332 GB, free: 41.74 MB / 0.6355 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001731/0.5134, allocations: 124.7 kB / 0.7334 GB, free: 41.71 MB / 0.6355 GB
Notification: Performance of setup shared object (initialization): time 0.0001412/0.5136, allocations: 0.5645 MB / 0.7339 GB, free: 41.21 MB / 0.6355 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002201/0.5138, allocations: 96.83 kB / 0.734 GB, free: 41.21 MB / 0.6355 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0002953/0.5141, allocations: 341.8 kB / 0.7343 GB, free: 40.95 MB / 0.6355 GB
Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: volDyn.dynBal.medium.p = volDyn.dynBal.p_start (bou.p = volDyn.dynBal.p_start)
Notification: Performance of analyzeInitialSystem (initialization): time 0.0009718/0.5151, allocations: 0.619 MB / 0.7349 GB, free: 40.73 MB / 0.6355 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.168e-06/0.5151, allocations: 1.812 kB / 0.7349 GB, free: 40.73 MB / 0.6355 GB
Notification: Performance of matching and sorting (n=73) (initialization): time 0.0007332/0.5158, allocations: 0.4887 MB / 0.7354 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of prepare postOptimizeDAE: time 2.203e-05/0.5158, allocations: 10.59 kB / 0.7354 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.297e-06/0.5158, allocations: 3.5 kB / 0.7354 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of postOpt tearingSystem (initialization): time 2.139e-05/0.5158, allocations: 7.906 kB / 0.7354 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004638/0.5163, allocations: 163.8 kB / 0.7356 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.216e-05/0.5163, allocations: 7.578 kB / 0.7356 GB, free: 40.65 MB / 0.6355 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004549/0.5168, allocations: 52.73 kB / 0.7356 GB, free: 40.64 MB / 0.6355 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.618e-05/0.5168, allocations: 24.59 kB / 0.7357 GB, free: 40.64 MB / 0.6355 GB
Warning: The initial conditions are over specified. The following 1 initial equations are redundant, so they are removed from the initialization system:
         volDyn.dynBal.medium.p = volDyn.dynBal.p_start.
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 17
 * 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 (73):
 * Single equations (assignments): 73
 * 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 0.0002265/0.517, allocations: 197.7 kB / 0.7359 GB, free: 40.48 MB / 0.6355 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001222/0.5172, allocations: 91.5 kB / 0.7359 GB, free: 40.44 MB / 0.6355 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0001206/0.5173, allocations: 85.44 kB / 0.736 GB, free: 40.43 MB / 0.6355 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.821e-06/0.5173, allocations: 4.656 kB / 0.736 GB, free: 40.43 MB / 0.6355 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 9.939e-06/0.5173, allocations: 5.906 kB / 0.736 GB, free: 40.43 MB / 0.6355 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0005038/0.5178, allocations: 0.5758 MB / 0.7366 GB, free: 39.98 MB / 0.6355 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002517/0.5203, allocations: 1.403 MB / 0.738 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.374e-06/0.5203, allocations: 5.188 kB / 0.738 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004288/0.5208, allocations: 138.2 kB / 0.7381 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt tearingSystem (simulation): time 9.268e-06/0.5208, allocations: 4 kB / 0.7381 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.52e-05/0.5208, allocations: 19.59 kB / 0.7381 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 6.933e-06/0.5208, allocations: 4 kB / 0.7381 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 6.082e-06/0.5208, allocations: 8.781 kB / 0.7381 GB, free: 39.51 MB / 0.6355 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0008898/0.5217, allocations: 0.7163 MB / 0.7388 GB, free: 39.11 MB / 0.6355 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0002555/0.522, allocations: 153.4 kB / 0.739 GB, free: 39.07 MB / 0.6355 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 8.175e-05/0.5221, allocations: 15.78 kB / 0.739 GB, free: 39.07 MB / 0.6355 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004014/0.5225, allocations: 51.09 kB / 0.739 GB, free: 39.07 MB / 0.6355 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001028/0.5226, allocations: 42.12 kB / 0.7391 GB, free: 39.07 MB / 0.6355 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.914e-05/0.5226, allocations: 26.61 kB / 0.7391 GB, free: 39.07 MB / 0.6355 GB
Notification: Performance of sorting global known variables: time 0.0003908/0.523, allocations: 413.1 kB / 0.7395 GB, free: 38.93 MB / 0.6355 GB
Notification: Performance of sort global known variables: time 1.5e-07/0.523, allocations: 0.9688 kB / 0.7395 GB, free: 38.93 MB / 0.6355 GB
Notification: Performance of remove unused functions: time 0.0008203/0.5238, allocations: 267.4 kB / 0.7398 GB, free: 38.93 MB / 0.6355 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 14
 * Number of states: 3 (volDyn.dynBal.medium.Xi[1],volDyn.dynBal.U,volDyn.dynBal.mC[1])
 * 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 (45):
 * Single equations (assignments): 45
 * 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 0.0003236/0.5242, allocations: 200 kB / 0.74 GB, free: 38.83 MB / 0.6355 GB
Notification: Performance of simCode: created initialization part: time 0.000606/0.5248, allocations: 341.5 kB / 0.7403 GB, free: 38.8 MB / 0.6355 GB
Notification: Performance of simCode: created event and clocks part: time 4.649e-06/0.5248, allocations: 0 / 0.7403 GB, free: 38.8 MB / 0.6355 GB
Notification: Performance of simCode: created simulation system equations: time 0.0002304/0.525, allocations: 156.9 kB / 0.7404 GB, free: 38.79 MB / 0.6355 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001365/0.5264, allocations: 472.2 kB / 0.7409 GB, free: 38.76 MB / 0.6355 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003012/0.5294, allocations: 1.803 MB / 0.7426 GB, free: 37.88 MB / 0.6355 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0002144/0.5296, allocations: 244.1 kB / 0.7429 GB, free: 37.8 MB / 0.6355 GB
Notification: Performance of simCode: alias equations: time 0.0006202/0.5302, allocations: 188.7 kB / 0.743 GB, free: 37.76 MB / 0.6355 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001926/0.5304, allocations: 72.05 kB / 0.7431 GB, free: 37.75 MB / 0.6355 GB
Notification: Performance of SimCode: time 1.183e-06/0.5304, allocations: 0 / 0.7431 GB, free: 37.75 MB / 0.6355 GB
Notification: Performance of Templates: time 0.02118/0.5516, allocations: 18.45 MB / 0.7611 GB, free: 35.87 MB / 0.6355 GB
"
[Timeout remaining time 659]
make -j1 -f IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.makefile [Timeout 660]
(rm -f IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.pipe ; mkfifo IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.pipe ; head -c 1048576 < IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.pipe >> ../files/IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.sim & ./IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate -abortSlowSimulation -alarm=240  -lv LOG_STATS > IDEAS_dev_IDEAS.Fluid.MixingVolumes.Validation.MixingVolumeTraceSubstanceReverseFlowPrescribedHeatFlowRate.pipe 2>&1) [Timeout 240]
[Calling sys.exit(0), Time elapsed: 4.689164981013164]