Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 1.6.0+build.1/package.mo", uses=false) Using package Buildings with version 1.6 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 1.6.0+build.1/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Running command: translateModel(Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization") translateModel(Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001112/0.001112, allocations: 91.69 kB / 15.06 MB, free: 1.098 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.00148/0.00148, allocations: 172.7 kB / 15.95 MB, free: 208 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.967/1.967, allocations: 205.4 MB / 222.1 MB, free: 5.664 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 1.6.0+build.1/package.mo): time 0.7084/0.7084, allocations: 95.63 MB / 366 MB, free: 10.36 MB / 302.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Buildings requested package Modelica of version 3.2.1. Modelica 3.2.3 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.0006483/0.0006485, allocations: 19.98 kB / 446.8 MB, free: 9.367 MB / 382.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.4573/0.458, allocations: 70.34 MB / 0.5051 GB, free: 16.52 MB / 382.1 MB Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization): time 0.6381/1.096, allocations: 142.7 MB / 0.6444 GB, free: 1.816 MB / 494.1 MB Notification: Performance of NFInst.instExpressions: time 0.01717/1.113, allocations: 9.891 MB / 0.6541 GB, free: 1.629 MB / 494.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.002198/1.116, allocations: 38.31 kB / 0.6541 GB, free: 1.629 MB / 494.1 MB Notification: Performance of NFTyping.typeComponents: time 0.001268/1.117, allocations: 322 kB / 0.6544 GB, free: 1.621 MB / 494.1 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:734:36-735:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:732:36-733:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:734:36-735:54:writable] Warning: 'each' used when modifying non-array element m_flow. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Fluid/Sources.mo:732:36-733:54:writable] Warning: 'each' used when modifying non-array element m_flow. Notification: Performance of NFTyping.typeBindings: time 0.005581/1.123, allocations: 1.381 MB / 0.6558 GB, free: 1.551 MB / 494.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.007794/1.13, allocations: 1.914 MB / 0.6577 GB, free: 1.484 MB / 494.1 MB Notification: Performance of NFFlatten.flatten: time 0.005139/1.135, allocations: 3.082 MB / 0.6607 GB, free: 1.477 MB / 494.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.001619/1.137, allocations: 0.521 MB / 0.6612 GB, free: 1.418 MB / 494.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.002678/1.14, allocations: 0.8774 MB / 0.662 GB, free: 1.414 MB / 494.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.002557/1.142, allocations: 0.9961 MB / 0.663 GB, free: 1.414 MB / 494.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0004747/1.143, allocations: 40.88 kB / 0.663 GB, free: 1.414 MB / 494.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.005512/1.148, allocations: 1.679 MB / 0.6647 GB, free: 1.395 MB / 494.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0007851/1.149, allocations: 274.6 kB / 0.6649 GB, free: 1.395 MB / 494.1 MB Notification: Performance of NFVerifyModel.verify: time 0.0009414/1.15, allocations: 201.7 kB / 0.6651 GB, free: 17.36 MB / 0.4981 GB Notification: Performance of NFConvertDAE.convert: time 0.00388/1.154, allocations: 1.663 MB / 0.6668 GB, free: 17.22 MB / 0.4981 GB Notification: Performance of FrontEnd - DAE generated: time 6.302e-06/1.154, allocations: 0 / 0.6668 GB, free: 17.22 MB / 0.4981 GB Notification: Performance of FrontEnd: time 2.265e-06/1.154, allocations: 0 / 0.6668 GB, free: 17.22 MB / 0.4981 GB Notification: Performance of Transformations before backend: time 6.484e-05/1.154, allocations: 0 / 0.6668 GB, free: 17.22 MB / 0.4981 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 149 * Number of variables: 149 Notification: Performance of Generate backend data structure: time 0.003605/1.158, allocations: 1.266 MB / 0.668 GB, free: 16.44 MB / 0.4981 GB Notification: Performance of prepare preOptimizeDAE: time 4.498e-05/1.158, allocations: 13.36 kB / 0.668 GB, free: 16.43 MB / 0.4981 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.000618/1.158, allocations: 104.2 kB / 0.6681 GB, free: 16.39 MB / 0.4981 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001698/1.16, allocations: 0.698 MB / 0.6688 GB, free: 16.11 MB / 0.4981 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.772e-05/1.16, allocations: 42.91 kB / 0.6688 GB, free: 16.11 MB / 0.4981 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001723/1.16, allocations: 59.16 kB / 0.6689 GB, free: 16.11 MB / 0.4981 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001668/1.162, allocations: 0.9142 MB / 0.6698 GB, free: 16 MB / 0.4981 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.924e-05/1.162, allocations: 2.688 kB / 0.6698 GB, free: 16 MB / 0.4981 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.579e-05/1.162, allocations: 23.45 kB / 0.6698 GB, free: 16 MB / 0.4981 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 8.592e-05/1.162, allocations: 58.27 kB / 0.6699 GB, free: 15.99 MB / 0.4981 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001453/1.164, allocations: 0.8962 MB / 0.6707 GB, free: 15.98 MB / 0.4981 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 0.00659/1.17, allocations: 3.664 MB / 0.6743 GB, free: 14.25 MB / 0.4981 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0008313/1.171, allocations: 456.7 kB / 0.6747 GB, free: 14.17 MB / 0.4981 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003699/1.172, allocations: 253.9 kB / 0.675 GB, free: 14.13 MB / 0.4981 GB Notification: Performance of preOpt evalFunc (simulation): time 0.002424/1.174, allocations: 1.712 MB / 0.6767 GB, free: 12.82 MB / 0.4981 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.539e-05/1.174, allocations: 36.91 kB / 0.6767 GB, free: 12.79 MB / 0.4981 GB Notification: Performance of pre-optimization done (n=36): time 2.976e-06/1.174, allocations: 2.75 kB / 0.6767 GB, free: 12.79 MB / 0.4981 GB Notification: Performance of matching and sorting (n=41): time 0.00507/1.179, allocations: 1.75 MB / 0.6784 GB, free: 12.08 MB / 0.4981 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001408/1.179, allocations: 157.3 kB / 0.6786 GB, free: 11.89 MB / 0.4981 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001585/1.181, allocations: 0.8196 MB / 0.6794 GB, free: 11.63 MB / 0.4981 GB Notification: Performance of collectPreVariables (initialization): time 8.152e-05/1.181, allocations: 35.3 kB / 0.6794 GB, free: 11.6 MB / 0.4981 GB Notification: Performance of collectInitialEqns (initialization): time 0.0003937/1.182, allocations: 443.8 kB / 0.6798 GB, free: 11.36 MB / 0.4981 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001645/1.182, allocations: 150.2 kB / 0.68 GB, free: 11.25 MB / 0.4981 GB Notification: Performance of simplifyInitialFunctions (initialization): time 4.272e-05/1.182, allocations: 15.41 kB / 0.68 GB, free: 11.25 MB / 0.4981 GB Notification: Performance of setup shared object (initialization): time 0.0001724/1.182, allocations: 338.4 kB / 0.6803 GB, free: 10.94 MB / 0.4981 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0004967/1.182, allocations: 269.8 kB / 0.6806 GB, free: 10.9 MB / 0.4981 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0008284/1.183, allocations: 0.4947 MB / 0.681 GB, free: 10.59 MB / 0.4981 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.000599/1.184, allocations: 355.7 kB / 0.6814 GB, free: 10.55 MB / 0.4981 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.936e-06/1.184, allocations: 3.219 kB / 0.6814 GB, free: 10.55 MB / 0.4981 GB Notification: Performance of matching and sorting (n=89) (initialization): time 0.001821/1.186, allocations: 0.97 MB / 0.6823 GB, free: 10.27 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 0.0002227/1.186, allocations: 267.1 kB / 0.6826 GB, free: 9.961 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.706e-05/1.186, allocations: 6.688 kB / 0.6826 GB, free: 9.961 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0001611/1.186, allocations: 35.7 kB / 0.6826 GB, free: 9.945 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007083/1.187, allocations: 172.1 kB / 0.6828 GB, free: 9.922 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001284/1.188, allocations: 1.318 MB / 0.6841 GB, free: 8.633 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0008714/1.189, allocations: 47.56 kB / 0.6841 GB, free: 8.621 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.953e-05/1.189, allocations: 35.38 kB / 0.6842 GB, free: 8.621 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 9.948e-06/1.189, allocations: 7.875 kB / 0.6842 GB, free: 8.617 MB / 0.4981 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001706/1.191, allocations: 0.8464 MB / 0.685 GB, free: 8.418 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.117e-05/1.191, allocations: 9.266 kB / 0.685 GB, free: 8.414 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0001012/1.191, allocations: 29.05 kB / 0.685 GB, free: 8.406 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000701/1.192, allocations: 166.4 kB / 0.6852 GB, free: 8.383 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001354/1.193, allocations: 1.317 MB / 0.6865 GB, free: 7.098 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0009373/1.194, allocations: 61.08 kB / 0.6865 GB, free: 7.078 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001318/1.194, allocations: 34.42 kB / 0.6866 GB, free: 7.074 MB / 0.4981 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 27 * 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 (88): * Single equations (assignments): 87 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 1 {(1,100.0%) 1} * Non-linear torn systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.0007399/1.195, allocations: 331.9 kB / 0.6869 GB, free: 6.871 MB / 0.4981 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002415/1.195, allocations: 89.73 kB / 0.687 GB, free: 6.824 MB / 0.4981 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001422/1.197, allocations: 0.7386 MB / 0.6877 GB, free: 6.547 MB / 0.4981 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 8.396e-06/1.197, allocations: 10.2 kB / 0.6877 GB, free: 6.543 MB / 0.4981 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.319e-06/1.197, allocations: 0 / 0.6877 GB, free: 6.543 MB / 0.4981 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.913e-06/1.197, allocations: 6.891 kB / 0.6877 GB, free: 6.539 MB / 0.4981 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002376/1.199, allocations: 1.453 MB / 0.6891 GB, free: 5.863 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.637e-06/1.199, allocations: 3.344 kB / 0.6891 GB, free: 5.863 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004222/1.2, allocations: 85.05 kB / 0.6892 GB, free: 5.852 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (simulation): time 9.241e-05/1.2, allocations: 23.56 kB / 0.6892 GB, free: 5.84 MB / 0.4981 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.268e-05/1.2, allocations: 13.58 kB / 0.6892 GB, free: 5.836 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001319/1.201, allocations: 1.316 MB / 0.6905 GB, free: 4.547 MB / 0.4981 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.783e-06/1.201, allocations: 4.688 kB / 0.6905 GB, free: 4.547 MB / 0.4981 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.00182/1.203, allocations: 0.9933 MB / 0.6915 GB, free: 4.16 MB / 0.4981 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003869/1.203, allocations: 178.9 kB / 0.6917 GB, free: 4.012 MB / 0.4981 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001684/1.203, allocations: 6.938 kB / 0.6917 GB, free: 4.012 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.000559/1.204, allocations: 43 kB / 0.6917 GB, free: 3.992 MB / 0.4981 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001032/1.204, allocations: 29.52 kB / 0.6917 GB, free: 3.98 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 7.971e-05/1.204, allocations: 18.8 kB / 0.6918 GB, free: 3.977 MB / 0.4981 GB Notification: Performance of sorting global known variables: time 0.001013/1.205, allocations: 0.5859 MB / 0.6923 GB, free: 3.801 MB / 0.4981 GB Notification: Performance of sort global known variables: time 1.9e-07/1.205, allocations: 0 / 0.6923 GB, free: 3.801 MB / 0.4981 GB Notification: Performance of remove unused functions: time 0.002729/1.208, allocations: 0.7045 MB / 0.693 GB, free: 3.691 MB / 0.4981 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 2 (vol1.dynBal.medium.p,vol1.dynBal.medium.T) * 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 (44): * Single equations (assignments): 43 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 1 {(1,100.0%) 1} * Non-linear torn systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.002549/1.211, allocations: 0.6068 MB / 0.6936 GB, free: 3.422 MB / 0.4981 GB Notification: Performance of simCode: created initialization part: time 0.002624/1.213, allocations: 1.222 MB / 0.6948 GB, free: 3.07 MB / 0.4981 GB Notification: Performance of simCode: created event and clocks part: time 7.244e-06/1.213, allocations: 3.938 kB / 0.6948 GB, free: 3.066 MB / 0.4981 GB Notification: Performance of simCode: created simulation system equations: time 0.0006421/1.214, allocations: 356 kB / 0.6951 GB, free: 2.926 MB / 0.4981 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002212/1.216, allocations: 400.7 kB / 0.6955 GB, free: 2.801 MB / 0.4981 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003333/1.219, allocations: 1.864 MB / 0.6974 GB, free: 1.73 MB / 0.4981 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0008458/1.22, allocations: 0.9953 MB / 0.6983 GB, free: 0.9102 MB / 0.4981 GB Notification: Performance of simCode: alias equations: time 0.001474/1.222, allocations: 341 kB / 0.6986 GB, free: 0.7734 MB / 0.4981 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002622/1.222, allocations: 84.31 kB / 0.6987 GB, free: 0.7578 MB / 0.4981 GB Notification: Performance of SimCode: time 2.655e-06/1.222, allocations: 0 / 0.6987 GB, free: 0.7578 MB / 0.4981 GB Notification: Performance of Templates: time 0.04036/1.262, allocations: 20.88 MB / 0.7191 GB, free: 13.09 MB / 0.5294 GB make -j1 -f Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.makefile Environment - environmentSimulation: (rm -f Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.pipe ; mkfifo Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.pipe ; head -c 1048576 < Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.pipe >> ../files/Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.sim & ./Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_1.6_Buildings.Fluid.MixingVolumes.Examples.MixingVolumeInitialization.pipe 2>&1) Environment - environmentSimulation: