Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.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 4.0.0+maint.om/package.mo", uses=false)
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo", uses=false)
Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo)
Using package Modelica with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+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(IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass")
translateModel(IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass")
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001494/0.001494, allocations: 107.1 kB / 16.27 MB, free: 6.41 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001335/0.001335, allocations: 184.1 kB / 17.2 MB, free: 5.953 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.335/1.335, allocations: 222.9 MB / 240.9 MB, free: 15.22 MB / 206.1 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.8111/0.8111, allocations: 126.1 MB / 417.1 MB, free: 12.87 MB / 334.1 MB
Notification: Performance of FrontEnd - loaded program: time 0.001263/0.001263, allocations: 60.08 kB / 0.495 GB, free: 3.551 MB / 414.1 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.5209/0.5222, allocations: 78.7 MB / 0.5718 GB, free: 31.12 MB / 446.1 MB
Notification: Performance of NFInst.instantiate(IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass): time 0.2396/0.7619, allocations: 177.1 MB / 0.7448 GB, free: 4.953 MB / 0.5762 GB
Notification: Performance of NFInst.instExpressions: time 0.007947/0.7699, allocations: 4.4 MB / 0.7491 GB, free: 0.543 MB / 0.5762 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.00127/0.7712, allocations: 23.88 kB / 0.7491 GB, free: 0.5195 MB / 0.5762 GB
Notification: Performance of NFTyping.typeComponents: time 0.00115/0.7724, allocations: 357.8 kB / 0.7494 GB, free: 172 kB / 0.5762 GB
Notification: Performance of NFTyping.typeBindings: time 0.3626/1.135, allocations: 1.25 MB / 0.7507 GB, free: 2.059 MB / 0.5762 GB
Notification: Performance of NFTyping.typeClassSections: time 0.001726/1.137, allocations: 0.6825 MB / 0.7513 GB, free: 2.059 MB / 0.5762 GB
Notification: Performance of NFFlatten.flatten: time 0.002379/1.139, allocations: 1.626 MB / 0.7529 GB, free: 2.055 MB / 0.5762 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.0009254/1.14, allocations: 0.5348 MB / 0.7534 GB, free: 2.016 MB / 0.5762 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.001675/1.142, allocations: 0.6703 MB / 0.7541 GB, free: 2.016 MB / 0.5762 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.00118/1.143, allocations: 488.6 kB / 0.7546 GB, free: 2.016 MB / 0.5762 GB
Notification: Performance of NFPackage.collectConstants: time 0.0001311/1.143, allocations: 53.34 kB / 0.7546 GB, free: 2.016 MB / 0.5762 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.002899/1.146, allocations: 1.287 MB / 0.7559 GB, free: 2 MB / 0.5762 GB
Notification: Performance of NFScalarize.scalarize: time 0.0004097/1.146, allocations: 236.9 kB / 0.7561 GB, free: 2 MB / 0.5762 GB
Notification: Performance of NFVerifyModel.verify: time 0.0005669/1.147, allocations: 354.4 kB / 0.7564 GB, free: 2 MB / 0.5762 GB
Notification: Performance of NFConvertDAE.convert: time 0.002598/1.15, allocations: 1.263 MB / 0.7577 GB, free: 1.926 MB / 0.5762 GB
Notification: Performance of FrontEnd - DAE generated: time 4.148e-06/1.15, allocations: 0 / 0.7577 GB, free: 1.926 MB / 0.5762 GB
Notification: Performance of FrontEnd: time 1.833e-06/1.15, allocations: 0.7812 kB / 0.7577 GB, free: 1.926 MB / 0.5762 GB
Notification: Performance of Transformations before backend: time 1.131e-05/1.15, allocations: 0.7188 kB / 0.7577 GB, free: 1.926 MB / 0.5762 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 104
 * Number of variables: 104
Notification: Performance of Generate backend data structure: time 0.001861/1.152, allocations: 1.003 MB / 0.7586 GB, free: 17.31 MB / 0.5919 GB
Notification: Performance of prepare preOptimizeDAE: time 3.723e-05/1.152, allocations: 9.156 kB / 0.7586 GB, free: 17.31 MB / 0.5919 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001135/1.153, allocations: 175.6 kB / 0.7588 GB, free: 17.27 MB / 0.5919 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.0007757/1.154, allocations: 0.5247 MB / 0.7593 GB, free: 17.01 MB / 0.5919 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 2.879e-05/1.154, allocations: 33.91 kB / 0.7594 GB, free: 17.01 MB / 0.5919 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 7.644e-05/1.154, allocations: 45.81 kB / 0.7594 GB, free: 17.01 MB / 0.5919 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.0007892/1.154, allocations: 466.1 kB / 0.7598 GB, free: 16.97 MB / 0.5919 GB
Notification: Performance of preOpt findStateOrder (simulation): time 1.238e-05/1.154, allocations: 0 / 0.7598 GB, free: 16.97 MB / 0.5919 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 4.458e-05/1.155, allocations: 16.06 kB / 0.7599 GB, free: 16.97 MB / 0.5919 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 3e-05/1.155, allocations: 16.31 kB / 0.7599 GB, free: 16.97 MB / 0.5919 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0007478/1.155, allocations: 422.1 kB / 0.7603 GB, free: 16.97 MB / 0.5919 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 0.002727/1.158, allocations: 2.054 MB / 0.7623 GB, free: 15.96 MB / 0.5919 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.0004999/1.159, allocations: 289.3 kB / 0.7626 GB, free: 15.93 MB / 0.5919 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0003057/1.159, allocations: 189.4 kB / 0.7627 GB, free: 15.93 MB / 0.5919 GB
Notification: Performance of preOpt evalFunc (simulation): time 0.0002777/1.159, allocations: 189.7 kB / 0.7629 GB, free: 15.74 MB / 0.5919 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 2.932e-05/1.159, allocations: 43.02 kB / 0.763 GB, free: 15.7 MB / 0.5919 GB
Notification: Performance of pre-optimization done (n=30): time 2.154e-06/1.159, allocations: 0 / 0.763 GB, free: 15.7 MB / 0.5919 GB
Notification: Performance of matching and sorting (n=30): time 0.001457/1.161, allocations: 0.6418 MB / 0.7636 GB, free: 15.54 MB / 0.5919 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 4.212e-05/1.161, allocations: 58.69 kB / 0.7636 GB, free: 15.47 MB / 0.5919 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0004074/1.161, allocations: 452.5 kB / 0.7641 GB, free: 15.34 MB / 0.5919 GB
Notification: Performance of collectPreVariables (initialization): time 3.473e-05/1.161, allocations: 30.86 kB / 0.7641 GB, free: 15.31 MB / 0.5919 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0001466/1.161, allocations: 276.8 kB / 0.7644 GB, free: 15.18 MB / 0.5919 GB
Notification: Performance of collectInitialBindings (initialization): time 7.277e-05/1.161, allocations: 104.5 kB / 0.7645 GB, free: 15.11 MB / 0.5919 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 9.397e-05/1.162, allocations: 69.48 kB / 0.7645 GB, free: 15.09 MB / 0.5919 GB
Notification: Performance of setup shared object (initialization): time 0.0001316/1.162, allocations: 359.1 kB / 0.7649 GB, free: 14.78 MB / 0.5919 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002489/1.162, allocations: 136.6 kB / 0.765 GB, free: 14.77 MB / 0.5919 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0002979/1.162, allocations: 197 kB / 0.7652 GB, free: 14.7 MB / 0.5919 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0005377/1.163, allocations: 329.9 kB / 0.7655 GB, free: 14.66 MB / 0.5919 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.066e-06/1.163, allocations: 2.938 kB / 0.7655 GB, free: 14.66 MB / 0.5919 GB
Notification: Performance of matching and sorting (n=37) (initialization): time 0.0007081/1.163, allocations: 406.9 kB / 0.7659 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of prepare postOptimizeDAE: time 1.588e-05/1.164, allocations: 8.438 kB / 0.7659 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.414e-06/1.164, allocations: 2.094 kB / 0.7659 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of postOpt tearingSystem (initialization): time 1.433e-05/1.164, allocations: 3.062 kB / 0.7659 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003496/1.164, allocations: 64.45 kB / 0.766 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 9.548e-06/1.164, allocations: 12.48 kB / 0.766 GB, free: 14.59 MB / 0.5919 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004602/1.164, allocations: 39.81 kB / 0.766 GB, free: 14.57 MB / 0.5919 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.465e-05/1.164, allocations: 17.38 kB / 0.766 GB, free: 14.57 MB / 0.5919 GB
Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0004091/1.165, allocations: 290.4 kB / 0.7663 GB, free: 14.49 MB / 0.5919 GB
Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0003019/1.165, allocations: 210 kB / 0.7665 GB, free: 14.42 MB / 0.5919 GB
Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0005153/1.166, allocations: 321.5 kB / 0.7668 GB, free: 14.38 MB / 0.5919 GB
Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 2.134e-06/1.166, allocations: 1.781 kB / 0.7668 GB, free: 14.38 MB / 0.5919 GB
Notification: Performance of matching and sorting (n=37) (initialization_lambda0): time 0.0006813/1.166, allocations: 403.4 kB / 0.7672 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of prepare postOptimizeDAE: time 1.164e-05/1.166, allocations: 7.812 kB / 0.7672 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.885e-06/1.166, allocations: 1.781 kB / 0.7672 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of postOpt tearingSystem (initialization): time 4.228e-06/1.166, allocations: 2.938 kB / 0.7672 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003093/1.167, allocations: 69.27 kB / 0.7673 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 5.34e-06/1.167, allocations: 5.25 kB / 0.7673 GB, free: 14.31 MB / 0.5919 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004289/1.167, allocations: 31.27 kB / 0.7673 GB, free: 14.3 MB / 0.5919 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.121e-05/1.167, allocations: 15.33 kB / 0.7673 GB, free: 14.3 MB / 0.5919 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 (37):
 * Single equations (assignments): 37
 * 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 0.0001672/1.167, allocations: 202.3 kB / 0.7675 GB, free: 14.12 MB / 0.5919 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 8.782e-05/1.167, allocations: 47.97 kB / 0.7676 GB, free: 14.1 MB / 0.5919 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0008106/1.168, allocations: 427.7 kB / 0.768 GB, free: 14.04 MB / 0.5919 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.45e-06/1.168, allocations: 4.219 kB / 0.768 GB, free: 14.04 MB / 0.5919 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 6.482e-06/1.168, allocations: 1.344 kB / 0.768 GB, free: 14.04 MB / 0.5919 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.0007072/1.169, allocations: 452 kB / 0.7684 GB, free: 13.86 MB / 0.5919 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001671/1.171, allocations: 1.141 MB / 0.7695 GB, free: 13.47 MB / 0.5919 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.347e-06/1.171, allocations: 1.125 kB / 0.7695 GB, free: 13.47 MB / 0.5919 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002907/1.171, allocations: 58.8 kB / 0.7696 GB, free: 13.47 MB / 0.5919 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.0002109/1.171, allocations: 54.14 kB / 0.7696 GB, free: 13.46 MB / 0.5919 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.552e-05/1.171, allocations: 9.875 kB / 0.7697 GB, free: 13.46 MB / 0.5919 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001266/1.173, allocations: 1.539 MB / 0.7712 GB, free: 12.12 MB / 0.5919 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.569e-06/1.173, allocations: 9.312 kB / 0.7712 GB, free: 12.12 MB / 0.5919 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001052/1.174, allocations: 0.6859 MB / 0.7718 GB, free: 11.9 MB / 0.5919 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0001879/1.174, allocations: 160.2 kB / 0.772 GB, free: 11.78 MB / 0.5919 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 6.345e-05/1.174, allocations: 12.59 kB / 0.772 GB, free: 11.77 MB / 0.5919 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0003759/1.174, allocations: 19.84 kB / 0.772 GB, free: 11.77 MB / 0.5919 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 7.008e-05/1.174, allocations: 23.78 kB / 0.772 GB, free: 11.77 MB / 0.5919 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.302e-05/1.174, allocations: 15.61 kB / 0.7721 GB, free: 11.77 MB / 0.5919 GB
Notification: Performance of sorting global known variables: time 0.0003085/1.175, allocations: 314 kB / 0.7724 GB, free: 11.69 MB / 0.5919 GB
Notification: Performance of sort global known variables: time 1.8e-07/1.175, allocations: 3.188 kB / 0.7724 GB, free: 11.69 MB / 0.5919 GB
Notification: Performance of remove unused functions: time 0.000838/1.176, allocations: 303.5 kB / 0.7727 GB, free: 11.65 MB / 0.5919 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 8
 * Number of states: 2 (vol.dynBal.medium.Xi[1],vol.dynBal.U)
 * 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 (28):
 * Single equations (assignments): 27
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (not torn): 0
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 1 system
   {(1,2,100.0%)}
 * Non-linear torn systems (#iteration vars, #inner vars): 0 systems
Notification: Performance of Backend phase and start with SimCode phase: time 0.0003962/1.176, allocations: 195.1 kB / 0.7728 GB, free: 11.55 MB / 0.5919 GB
Notification: Performance of simCode: created initialization part: time 0.0008813/1.177, allocations: 0.5136 MB / 0.7733 GB, free: 11.54 MB / 0.5919 GB
Notification: Performance of simCode: created event and clocks part: time 2.655e-06/1.177, allocations: 0 / 0.7733 GB, free: 11.54 MB / 0.5919 GB
Notification: Performance of simCode: created simulation system equations: time 0.0004544/1.177, allocations: 286.5 kB / 0.7736 GB, free: 11.42 MB / 0.5919 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00137/1.179, allocations: 307.7 kB / 0.7739 GB, free: 11.39 MB / 0.5919 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.001545/1.18, allocations: 1.081 MB / 0.775 GB, free: 10.92 MB / 0.5919 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0004172/1.181, allocations: 0.9018 MB / 0.7758 GB, free: 10.22 MB / 0.5919 GB
Notification: Performance of simCode: alias equations: time 0.0005313/1.181, allocations: 169.7 kB / 0.776 GB, free: 10.2 MB / 0.5919 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 9.738e-05/1.181, allocations: 43.78 kB / 0.776 GB, free: 10.2 MB / 0.5919 GB
Notification: Performance of SimCode: time 4.31e-07/1.181, allocations: 0.8125 kB / 0.776 GB, free: 10.2 MB / 0.5919 GB
Notification: Performance of Templates: time 0.01643/1.198, allocations: 10.21 MB / 0.786 GB, free: 9.699 MB / 0.5919 GB
make -j1 -f IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.makefile
(rm -f IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.sim & ./IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass  -abortSlowSimulation -alarm=480 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe 2>&1)