Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder.conf.json
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo", uses=false) [Timeout 180]
"[<interactive>:1:22-1:33:writable] Warning: Modelica only supports 32-bit signed integers! Transforming: 13743895347 into a real
[<interactive>:1:1-1:33:writable] Error: Class GC_set_max_heap_size not found in scope <global scope> (looking for a function or record).
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo): time 0.0004693/0.0004693, allocations: 0 / 0, free: 0 / 0
"
[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 0.0004197/0.0004197, allocations: 0 / 0, free: 0 / 0
"
[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 0.3614/0.3614, allocations: 0 / 0, free: 0 / 0
"
[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 0.8459/0.8459, allocations: 0 / 0, free: 0 / 0
"
[Timeout remaining time 179]
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: "" <> buildModelFMU(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder,fileNamePrefix="Buildings_latest_Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder",fmuType="me_cs",version="3.0",platforms={"wasm"})
"" <> buildModelFMU(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder,fileNamePrefix="Buildings_latest_Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder",fmuType="me_cs",version="3.0",platforms={"wasm"}) [Timeout 300]
"Notification: Performance of FrontEnd - loaded program: time 2.665e-06/2.665e-06, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FrontEnd - Absyn->SCode: time 1.561e-05/1.827e-05, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFInst.instantiate(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder): time 0.006235/0.006253, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFInst.instExpressions: time 0.0035/0.009753, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFInst.updateImplicitVariability: time 0.0005023/0.01026, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFTyping.typeComponents: time 0.0004236/0.01068, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFTyping.typeBindings: time 0.0004439/0.01112, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFTyping.typeClassSections: time 0.0009176/0.01204, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFFlatten.flatten: time 0.0008265/0.01287, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFFlatten.resolveConnections: time 0.0006115/0.01348, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFEvalConstants.evaluate: time 0.0006366/0.01411, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFSimplifyModel.simplify: time 0.000341/0.01446, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFPackage.collectConstants: time 0.0001035/0.01456, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFFlatten.collectFunctions: time 8.272e-05/0.01464, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFScalarize.scalarize: time 0.0001649/0.01481, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFVerifyModel.verify: time 0.0002844/0.01509, allocations: 0 / 0, free: 0 / 0
Notification: Performance of NFConvertDAE.convert: time 0.001475/0.01657, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FrontEnd - DAE generated: time 5.872e-05/0.01662, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FrontEnd: time 4.178e-06/0.01663, allocations: 0 / 0, free: 0 / 0
Notification: Performance of Transformations before backend: time 1.037e-05/0.01664, allocations: 0 / 0, free: 0 / 0
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 66
 * Number of variables: 66
Notification: Performance of Generate backend data structure: time 0.002579/0.01922, allocations: 0 / 0, free: 0 / 0
Notification: Performance of prepare preOptimizeDAE: time 0.0001192/0.01934, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.000556/0.01989, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0004513/0.02034, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001514/0.02186, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.676e-05/0.02194, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001873/0.02212, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt clockPartitioning (simulation): time 0.002264/0.02439, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt findStateOrder (simulation): time 3.503e-05/0.02442, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001549/0.02458, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.695e-05/0.02459, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.00171/0.0263, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.004946/0.03125, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt comSubExp (simulation): time 0.001416/0.03266, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt resolveLoops (simulation): time 0.0005931/0.03326, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt evalFunc (simulation): time 3.698e-05/0.03329, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.86e-05/0.03334, allocations: 0 / 0, free: 0 / 0
Notification: Performance of pre-optimization done (n=16): time 5.465e-05/0.0334, allocations: 0 / 0, free: 0 / 0
Notification: Performance of matching and sorting (n=16): time 0.002251/0.03565, allocations: 0 / 0, free: 0 / 0
Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001198/0.03577, allocations: 0 / 0, free: 0 / 0
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001319/0.03709, allocations: 0 / 0, free: 0 / 0
Notification: Performance of collectPreVariables (initialization): time 0.0001314/0.03722, allocations: 0 / 0, free: 0 / 0
Notification: Performance of collectInitialEqns (initialization): time 0.0003754/0.03759, allocations: 0 / 0, free: 0 / 0
Notification: Performance of collectInitialBindings (initialization): time 0.0001348/0.03773, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003837/0.03811, allocations: 0 / 0, free: 0 / 0
Notification: Performance of setup shared object (initialization): time 0.0003997/0.03851, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0005925/0.0391, allocations: 0 / 0, free: 0 / 0
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0007095/0.03981, allocations: 0 / 0, free: 0 / 0
Notification: Performance of analyzeInitialSystem (initialization): time 0.001238/0.04105, allocations: 0 / 0, free: 0 / 0
Notification: Performance of solveInitialSystemEqSystem (initialization): time 6.963e-06/0.04106, allocations: 0 / 0, free: 0 / 0
Notification: Performance of matching and sorting (n=20) (initialization): time 0.001859/0.04292, allocations: 0 / 0, free: 0 / 0
Notification: Performance of prepare postOptimizeDAE: time 2.77e-05/0.04295, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.782e-06/0.04295, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt tearingSystem (initialization): time 1.75e-05/0.04297, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004488/0.04342, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.238e-05/0.04343, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0003285/0.04376, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.766e-05/0.04384, allocations: 0 / 0, free: 0 / 0
Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0008594/0.0447, allocations: 0 / 0, free: 0 / 0
Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0005891/0.04529, allocations: 0 / 0, free: 0 / 0
Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.001006/0.04629, allocations: 0 / 0, free: 0 / 0
Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.379e-06/0.0463, allocations: 0 / 0, free: 0 / 0
Notification: Performance of matching and sorting (n=20) (initialization_lambda0): time 0.001577/0.04787, allocations: 0 / 0, free: 0 / 0
Notification: Performance of prepare postOptimizeDAE: time 2.407e-05/0.0479, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.084e-06/0.04791, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt tearingSystem (initialization): time 1.06e-05/0.04792, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003713/0.04829, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 9.979e-06/0.0483, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0002903/0.04859, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.218e-05/0.04865, allocations: 0 / 0, free: 0 / 0
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 3
 * Number of states: 0 ()
 * Number of discrete variables: 3 (expMod.oveWriAct_activate,expMod.oveWriSet_activate,expMod.mod.conPI.I.local_reset)
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for initialization (20):
 * Single equations (assignments): 20
 * 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 0.0004244/0.04907, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003441/0.04942, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0002739/0.04969, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt inlineArrayEqn (simulation): time 6.612e-06/0.0497, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt constantLinearSystem (simulation): time 8.827e-06/0.04971, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifysemiLinear (simulation): time 9.598e-06/0.04972, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001883/0.0516, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.519e-06/0.0516, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.000422/0.05203, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt tearingSystem (simulation): time 9.528e-06/0.05204, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001038/0.05214, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 5.4e-06/0.05215, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.547e-06/0.05215, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002683/0.05483, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt removeConstants (simulation): time 0.0007636/0.0556, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0003076/0.0559, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0005136/0.05642, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0003062/0.05672, allocations: 0 / 0, free: 0 / 0
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 7.399e-05/0.0568, allocations: 0 / 0, free: 0 / 0
Notification: Performance of sorting global known variables: time 0.001004/0.0578, allocations: 0 / 0, free: 0 / 0
Notification: Performance of sort global known variables: time 1.764e-05/0.05782, allocations: 0 / 0, free: 0 / 0
Notification: Performance of remove unused functions: time 0.002238/0.06006, allocations: 0 / 0, free: 0 / 0
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 1
 * Number of states: 2 (expMod.mod.conPI.I.y,expMod.mod.firOrd.y)
 * Number of discrete variables: 2 (expMod.oveWriSet_activate,expMod.oveWriAct_activate)
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for simulation (16):
 * Single equations (assignments): 16
 * 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 0.003839/0.06389, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: created initialization part: time 0.002234/0.06613, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: created event and clocks part: time 8.436e-06/0.06614, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: created simulation system equations: time 0.000725/0.06686, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00258/0.06944, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01586/0.0853, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0005605/0.08586, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: alias equations: time 0.0005924/0.08646, allocations: 0 / 0, free: 0 / 0
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001083/0.08754, allocations: 0 / 0, free: 0 / 0
Notification: Performance of SimCode: time 0.00117/0.08871, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU modelDescription.xml: time 0.006493/0.0952, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU model kernel: time 0.002977/0.09818, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU translated model: time 0.02945/0.1276, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU component link: time 1.051e-05/0.1276, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU precompile: time 2.325e-05/0.1277, allocations: 0 / 0, free: 0 / 0
Notification: Performance of FMU write (0.1 MB unzipped): time 0.000165/0.1278, allocations: 0 / 0, free: 0 / 0
Notification: Building FMU for platform 'wasm' (1/1).
Notification: Finished FMU for platform 'wasm' (1/1).
"
[Timeout remaining time 300]
simulate(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder,startTime=0,stopTime=150,tolerance=1e-06,numberOfIntervals=2500,outputFormat="mat",variableFilter="time|expMod.oveWriSet_u|expMod.oveWriAct_u|expMod.rea|expMod.oveWriSet_activate|expMod.oveWriAct_activate",fileNamePrefix="Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder",simflags=" -alarm=240  -emit_protected -lv LOG_STATS -startTime=0 -stopTime=150 -tolerance=1e-06 -stepSize=0.06 -r=Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_res.mat",resimulateExecutable="Buildings_latest_Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.fmu") [Timeout 240]
""
[Timeout remaining time 240]
diffSimulationResults("Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_res.mat","/mnt/ReferenceFiles/Buildings/csv/master/Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.csv","/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300]
""
[Timeout remaining time 300]
Reference file matches
simulate(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder,startTime=0,stopTime=150,tolerance=1e-06,numberOfIntervals=2500,outputFormat="mat",variableFilter="time|expMod.oveWriSet_u|expMod.oveWriAct_u|expMod.rea|expMod.oveWriSet_activate|expMod.oveWriAct_activate",fileNamePrefix="Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder",simflags=" -alarm=240  -emit_protected -lv LOG_STATS -startTime=0 -stopTime=150 -tolerance=1e-06 -stepSize=0.06 -r=Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_me_res.mat -s fmi3:me:daskr",resimulateExecutable="Buildings_latest_Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.fmu") [Timeout 240]
""
[Timeout remaining time 240]
diffSimulationResults("Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_me_res.mat","/mnt/ReferenceFiles/Buildings/csv/master/Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.csv","/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_me.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001) [Timeout 300]
""
[Timeout remaining time 300]
Reference file matches
simulate(Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder,startTime=0,stopTime=150,tolerance=1e-06,numberOfIntervals=2500,outputFormat="mat",variableFilter="time|expMod.oveWriSet_u|expMod.oveWriAct_u|expMod.rea|expMod.oveWriSet_activate|expMod.oveWriAct_activate",fileNamePrefix="Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder",simflags=" -alarm=240  -emit_protected -lv LOG_STATS -startTime=0 -stopTime=150 -tolerance=1e-06 -stepSize=0.06 -r=Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_cs_res.mat -s fmi3:cs",resimulateExecutable="Buildings_latest_Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.fmu") [Timeout 240]
""
[Timeout remaining time 240]
diffSimulationResults("Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_cs_res.mat","/mnt/ReferenceFiles/Buildings/csv/master/Buildings_Utilities_IO_SignalExchange_Examples_FirstOrder.csv","/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_latest_Buildings.Utilities.IO.SignalExchange.Examples.FirstOrder_cs.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: 2.618123397929594]