Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Chemical_master_Chemical.Examples.Diffusion.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 0.0009352/0.0009352, allocations: 80.94 kB / 19.94 MB, free: 4.547 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 0.0009086/0.0009086, allocations: 173 kB / 23.36 MB, free: 1.133 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 0.9879/0.9879, allocations: 177.1 MB / 203.8 MB, free: 5.496 MB / 186.7 MB " [Timeout remaining time 179] loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Chemical master/package.mo", uses=false) [Timeout 180] "Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Chemical master/package.mo): time 0.09597/0.09597, allocations: 17.48 MB / 277.7 MB, free: 11.45 MB / 266.7 MB " [Timeout remaining time 180] Using package Chemical with version 2.0.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Chemical 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(Chemical.Examples.Diffusion,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="Chemical_master_Chemical.Examples.Diffusion") translateModel(Chemical.Examples.Diffusion,tolerance=1e-06,outputFormat="empty",numberOfIntervals=2500,variableFilter="",fileNamePrefix="Chemical_master_Chemical.Examples.Diffusion") [Timeout 660] "Notification: Performance of FrontEnd - loaded program: time 1.693e-06/1.693e-06, allocations: 0 / 300.8 MB, free: 1.73 MB / 266.7 MB Notification: Performance of FrontEnd - Absyn->SCode: time 2.445e-05/2.614e-05, allocations: 4.859 kB / 300.8 MB, free: 1.727 MB / 266.7 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Chemical master/Boundaries.mo:1361:7-1361:76:writable] Warning: An inner declaration for outer component dropOfCommons could not be found and was automatically generated. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Chemical master/Boundaries.mo:1361:7-1361:76:writable] Notification: The diagnostics message for the missing inner is: Your model is using an outer \"dropOfCommons\" component but an inner \"dropOfCommons\" component is not defined. Use Chemical.DropOfCommons in your model to specify system properties. Notification: Performance of NFInst.instantiate(Chemical.Examples.Diffusion): time 0.05407/0.0541, allocations: 70.3 MB / 371.1 MB, free: 13.94 MB / 346.7 MB Notification: Performance of NFInst.instExpressions: time 0.03093/0.08503, allocations: 18.63 MB / 389.7 MB, free: 11.23 MB / 362.7 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.008227/0.09326, allocations: 297.6 kB / 390 MB, free: 10.94 MB / 362.7 MB Notification: Performance of NFTyping.typeComponents: time 0.006802/0.1001, allocations: 2.726 MB / 392.7 MB, free: 8.195 MB / 362.7 MB Notification: Performance of NFTyping.typeBindings: time 0.01221/0.1123, allocations: 4.556 MB / 397.3 MB, free: 3.605 MB / 362.7 MB Notification: Performance of NFTyping.typeClassSections: time 0.007084/0.1193, allocations: 3.135 MB / 400.4 MB, free: 472 kB / 362.7 MB Notification: Performance of NFFlatten.flatten: time 0.01496/0.1343, allocations: 12.26 MB / 412.7 MB, free: 4.145 MB / 378.7 MB Notification: Performance of NFFlatten.resolveConnections: time 0.003528/0.1378, allocations: 2.483 MB / 415.1 MB, free: 1.535 MB / 378.7 MB Notification: Performance of NFEvalConstants.evaluate: time 0.01249/0.1503, allocations: 7.34 MB / 422.5 MB, free: 10.18 MB / 394.7 MB Notification: Performance of NFSimplifyModel.simplify: time 0.00889/0.1592, allocations: 5.12 MB / 427.6 MB, free: 5.047 MB / 394.7 MB Notification: Performance of NFPackage.collectConstants: time 0.002823/0.162, allocations: 1.164 MB / 428.8 MB, free: 3.883 MB / 394.7 MB Notification: Performance of NFFlatten.collectFunctions: time 0.007016/0.1691, allocations: 2.493 MB / 431.3 MB, free: 1.387 MB / 394.7 MB Notification: Performance of NFScalarize.scalarize: time 0.002982/0.172, allocations: 3.625 MB / 434.9 MB, free: 13.75 MB / 410.7 MB Notification: Performance of NFVerifyModel.verify: time 0.006264/0.1783, allocations: 4.149 MB / 439 MB, free: 9.59 MB / 410.7 MB Notification: Performance of NFConvertDAE.convert: time 0.2664/0.4447, allocations: 12.06 MB / 451.1 MB, free: 65.75 MB / 410.8 MB Notification: Performance of FrontEnd - DAE generated: time 4.859e-06/0.4447, allocations: 0 / 451.1 MB, free: 65.75 MB / 410.8 MB Notification: Performance of FrontEnd: time 1.402e-06/0.4447, allocations: 0.875 kB / 451.1 MB, free: 65.75 MB / 410.8 MB Notification: Performance of Transformations before backend: time 0.0004344/0.4451, allocations: 1.438 kB / 451.1 MB, free: 65.75 MB / 410.8 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 3621 * Number of variables: 3621 Notification: Performance of Generate backend data structure: time 0.01448/0.4596, allocations: 12.7 MB / 463.8 MB, free: 60.67 MB / 410.8 MB Notification: Performance of prepare preOptimizeDAE: time 4.194e-05/0.4596, allocations: 12.72 kB / 463.8 MB, free: 60.67 MB / 410.8 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.007368/0.467, allocations: 5.12 MB / 468.9 MB, free: 60.56 MB / 410.8 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.007041/0.474, allocations: 4.142 MB / 473.1 MB, free: 59.19 MB / 410.8 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0006058/0.4746, allocations: 1.507 MB / 474.6 MB, free: 58.48 MB / 410.8 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0008673/0.4755, allocations: 1.153 MB / 475.7 MB, free: 58.46 MB / 410.8 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.01304/0.4885, allocations: 13.66 MB / 489.4 MB, free: 57.55 MB / 410.8 MB Notification: Performance of preOpt findStateOrder (simulation): time 0.0001527/0.4887, allocations: 10.17 kB / 489.4 MB, free: 57.55 MB / 410.8 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0005126/0.4892, allocations: 477.1 kB / 489.9 MB, free: 57.55 MB / 410.8 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.001044/0.4903, allocations: 1.77 MB / 491.6 MB, free: 57.42 MB / 410.8 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01092/0.5012, allocations: 16.07 MB / 0.4958 GB, free: 42.19 MB / 410.8 MB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.04256/0.5437, allocations: 38.69 MB / 0.5336 GB, free: 5.398 MB / 410.8 MB Notification: Performance of preOpt comSubExp (simulation): time 0.003749/0.5475, allocations: 2.605 MB / 0.5361 GB, free: 2.855 MB / 410.8 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.001687/0.5492, allocations: 1.186 MB / 0.5373 GB, free: 1.672 MB / 410.8 MB Notification: Performance of preOpt evalFunc (simulation): time 0.0215/0.5707, allocations: 12.64 MB / 0.5496 GB, free: 5.348 MB / 426.8 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.882e-05/0.5707, allocations: 80.75 kB / 0.5497 GB, free: 5.266 MB / 426.8 MB Notification: Performance of pre-optimization done (n=393): time 6.963e-06/0.5707, allocations: 0 / 0.5497 GB, free: 5.266 MB / 426.8 MB Notification: Performance of matching and sorting (n=481): time 0.04292/0.6136, allocations: 18.48 MB / 0.5678 GB, free: 3.051 MB / 442.8 MB Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Notification: Performance of inlineWhenForInitialization (initialization): time 0.001155/0.6148, allocations: 1.908 MB / 0.5696 GB, free: 1.055 MB / 442.8 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003308/0.6181, allocations: 3.81 MB / 0.5733 GB, free: 14.07 MB / 458.8 MB Notification: Performance of collectPreVariables (initialization): time 0.0004601/0.6186, allocations: 109.4 kB / 0.5734 GB, free: 13.96 MB / 458.8 MB Notification: Performance of collectInitialEqns (initialization): time 0.002522/0.6211, allocations: 5.429 MB / 0.5787 GB, free: 8.75 MB / 458.8 MB Notification: Performance of collectInitialBindings (initialization): time 0.001147/0.6222, allocations: 1.736 MB / 0.5804 GB, free: 7.113 MB / 458.8 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.00185/0.6241, allocations: 1.562 MB / 0.582 GB, free: 5.699 MB / 458.8 MB Notification: Performance of setup shared object (initialization): time 5.912e-05/0.6241, allocations: 309 kB / 0.5823 GB, free: 5.395 MB / 458.8 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.002077/0.6262, allocations: 1.316 MB / 0.5835 GB, free: 4.074 MB / 458.8 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.003402/0.6296, allocations: 4.064 MB / 0.5875 GB, free: 14.95 MB / 474.8 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.007976/0.6376, allocations: 7.779 MB / 0.5951 GB, free: 6.578 MB / 474.8 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.128e-05/0.6376, allocations: 28 kB / 0.5951 GB, free: 6.551 MB / 474.8 MB Notification: Performance of matching and sorting (n=904) (initialization): time 0.01159/0.6492, allocations: 6.463 MB / 0.6014 GB, free: 0.7461 MB / 474.8 MB Notification: Performance of prepare postOptimizeDAE: time 5.036e-05/0.6493, allocations: 44 kB / 0.6015 GB, free: 0.7031 MB / 474.8 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.949e-05/0.6493, allocations: 92 kB / 0.6016 GB, free: 0.6133 MB / 474.8 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.003419/0.6528, allocations: 1.778 MB / 0.6033 GB, free: 14.87 MB / 490.8 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.008726/0.6615, allocations: 3.425 MB / 0.6067 GB, free: 11.63 MB / 490.8 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.159/0.8205, allocations: 23.68 MB / 0.6298 GB, free: 121 MB / 490.8 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.004621/0.8251, allocations: 314 kB / 0.6301 GB, free: 121 MB / 490.8 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.001149/0.8262, allocations: 0.8788 MB / 0.6309 GB, free: 121 MB / 490.8 MB Warning: Assuming fixed start value for the following 5 variables: d5.rear.n_flow:VARIABLE(flow=true unit = \"mol/s\" fixed = true ) \"Molar change of the substance\" type: Real d4.rear.n_flow:VARIABLE(flow=true unit = \"mol/s\" fixed = true ) \"Molar change of the substance\" type: Real d3.rear.n_flow:VARIABLE(flow=true unit = \"mol/s\" fixed = true ) \"Molar change of the substance\" type: Real d1.rear.n_flow:VARIABLE(flow=true unit = \"mol/s\" fixed = true ) \"Molar change of the substance\" type: Real d2.rear.n_flow:VARIABLE(flow=true unit = \"mol/s\" fixed = true ) \"Molar change of the substance\" type: Real Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 420 * Number of states: 0 () * Number of discrete variables: 12 (s2.substanceDefinitionVar.data.phase,s2.substanceDefinitionVar.SelfClustering,s1.substanceDefinitionVar.data.phase,s1.substanceDefinitionVar.SelfClustering,s3.substanceDefinitionVar.data.phase,s3.substanceDefinitionVar.SelfClustering,s4.substanceDefinitionVar.data.phase,s4.substanceDefinitionVar.SelfClustering,solvent.substanceDefinitionVar.data.phase,solvent.substanceDefinitionVar.SelfClustering,s5.substanceDefinitionVar.data.phase,s5.substanceDefinitionVar.SelfClustering) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (848): * Single equations (assignments): 828 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 20 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 14 systems {(2,2,100.0%), (1,4,100.0%), (1,1,100.0%), (1,4,100.0%), (1,1,100.0%), (2,1,100.0%), (2,2,100.0%), (1,4,100.0%), (1,1,100.0%), (1,4,100.0%), (1,1,100.0%), (1,1,100.0%), (1,4,100.0%), (1,1,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 6 systems {(1,6), (2,2), (1,2), (2,1), (1,6), (2,2)} Notification: Performance of prepare postOptimizeDAE: time 0.003542/0.8298, allocations: 0.6143 MB / 0.6315 GB, free: 120.8 MB / 490.8 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001991/0.8318, allocations: 0.5742 MB / 0.6321 GB, free: 120.8 MB / 490.8 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01724/0.849, allocations: 8.389 MB / 0.6403 GB, free: 120.1 MB / 490.8 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.955e-05/0.849, allocations: 49.28 kB / 0.6403 GB, free: 120.1 MB / 490.8 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.953e-05/0.8491, allocations: 9.781 kB / 0.6404 GB, free: 120.1 MB / 490.8 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 3.597e-05/0.8491, allocations: 24.42 kB / 0.6404 GB, free: 120.1 MB / 490.8 MB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.02478/0.8739, allocations: 13.83 MB / 0.6539 GB, free: 118.2 MB / 490.8 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.047e-05/0.8739, allocations: 10.66 kB / 0.6539 GB, free: 118.2 MB / 490.8 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.008461/0.8824, allocations: 2.189 MB / 0.656 GB, free: 118.2 MB / 490.8 MB Notification: Performance of postOpt tearingSystem (simulation): time 0.003969/0.8864, allocations: 2.133 MB / 0.6581 GB, free: 118 MB / 490.8 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0003345/0.8867, allocations: 148 kB / 0.6582 GB, free: 118 MB / 490.8 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.01193/0.8986, allocations: 25.31 MB / 0.683 GB, free: 95.36 MB / 490.8 MB Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Error: Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singular and cannot be handled because the number of unassigned equations is larger than the number of states. Use -d=bltdump to get more information. Error: Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 0.0006579/0.8993, allocations: 1.713 MB / 0.6846 GB, free: 93.88 MB / 490.8 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.009577/0.9088, allocations: 5.876 MB / 0.6904 GB, free: 92.37 MB / 490.8 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0008313/0.9097, allocations: 0.4967 MB / 0.6909 GB, free: 92.37 MB / 490.8 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0005401/0.9102, allocations: 114.8 kB / 0.691 GB, free: 92.37 MB / 490.8 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001476/0.9117, allocations: 167.1 kB / 0.6911 GB, free: 92.37 MB / 490.8 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0005847/0.9123, allocations: 412.2 kB / 0.6915 GB, free: 92.35 MB / 490.8 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0002511/0.9125, allocations: 202.9 kB / 0.6917 GB, free: 92.35 MB / 490.8 MB Notification: Performance of sorting global known variables: time 0.001366/0.9139, allocations: 1.968 MB / 0.6936 GB, free: 92.1 MB / 490.8 MB Notification: Performance of sort global known variables: time 1e-07/0.9139, allocations: 2.656 kB / 0.6936 GB, free: 92.1 MB / 490.8 MB Notification: Performance of remove unused functions: time 0.005588/0.9195, allocations: 2.205 MB / 0.6958 GB, free: 92.09 MB / 490.8 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 52 * Number of states: 19 (s2.logm,p2.logm,d2.rear.n_flow,s1.logm,p1.logm,d1.rear.n_flow,$STATESET3.x,s3.logm,p3.logm,d3.rear.n_flow,$STATESET2.x,s4.logm,p4.logm,d4.rear.n_flow,solvent.logm,$STATESET1.x,s5.logm,p5.logm,d5.rear.n_flow) * 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 (429): * Single equations (assignments): 409 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 20 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 14 systems {(1,4,100.0%), (1,1,100.0%), (1,1,100.0%), (1,4,100.0%), (1,1,100.0%), (1,1,100.0%), (2,2,100.0%), (1,4,100.0%), (1,4,100.0%), (1,1,100.0%), (1,1,100.0%), (2,1,100.0%), (2,2,100.0%), (1,4,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 6 systems {(1,5), (3,4), (1,2), (3,3), (1,5), (3,4)} Notification: Performance of Backend phase and start with SimCode phase: time 0.0006519/0.9201, allocations: 0.5146 MB / 0.6963 GB, free: 91.98 MB / 490.8 MB Notification: Performance of simCode: created initialization part: time 0.006343/0.9265, allocations: 6.12 MB / 0.7023 GB, free: 88.5 MB / 490.8 MB Notification: Performance of simCode: created event and clocks part: time 8.92e-05/0.9266, allocations: 87.94 kB / 0.7024 GB, free: 88.41 MB / 490.8 MB Notification: Performance of simCode: created simulation system equations: time 0.003508/0.9301, allocations: 3.768 MB / 0.706 GB, free: 84.8 MB / 490.8 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003058/0.9331, allocations: 1.49 MB / 0.7075 GB, free: 83.62 MB / 490.8 MB [/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelica/OMCompiler/Compiler/SimCode/SimCodeUtil.mo:4069:9-4069:59:writable] Error: Internal error function createStateSetsSets failed. [/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelica/OMCompiler/Compiler/SimCode/SimCodeUtil.mo:791:5-791:146:writable] Error: Internal error function createSimCode failed [Transformation from optimised DAE to simulation code structure failed] " [Timeout remaining time 659] [Calling sys.exit(0), Time elapsed: 2.596010198816657]