Running: ./testmodel.py --libraries=/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.conf.json loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) Using package ModelicaServices with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Using package Modelica with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo) Using package Complex with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package Buildings with version 8.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo) Running command: translateModel(Buildings.Fluid.Examples.Performance.Example3,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3") translateModel(Buildings.Fluid.Examples.Performance.Example3,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3") Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo): time 1.649/1.649, allocations: 291.7 MB / 306.8 MB, free: 7.699 MB / 234.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001005/0.001005, allocations: 185.5 kB / 375.4 MB, free: 5.125 MB / 298.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.332/1.332, allocations: 225.7 MB / 0.6538 GB, free: 13.62 MB / 490.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0008659/0.0008662, allocations: 101 kB / 0.7699 GB, free: 50.49 MB / 0.5417 GB Notification: Performance of FrontEnd - loaded program: time 0.0003867/0.0003867, allocations: 8 kB / 0.8956 GB, free: 11.93 MB / 0.6198 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.5757/0.5761, allocations: 118.1 MB / 1.011 GB, free: 57.94 MB / 0.7136 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Examples.Performance.Example3): time 0.02655/0.6027, allocations: 30.15 MB / 1.04 GB, free: 44.29 MB / 0.7136 GB Notification: Performance of NFInst.instExpressions: time 0.01564/0.6184, allocations: 12.26 MB / 1.052 GB, free: 35.92 MB / 0.7136 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001553/0.62, allocations: 43.53 kB / 1.052 GB, free: 35.9 MB / 0.7136 GB Notification: Performance of NFTyping.typeComponents: time 0.001634/0.6217, allocations: 499.3 kB / 1.053 GB, free: 35.64 MB / 0.7136 GB Notification: Performance of NFTyping.typeBindings: time 0.003422/0.6251, allocations: 1.274 MB / 1.054 GB, free: 34.95 MB / 0.7136 GB Notification: Performance of NFTyping.typeClassSections: time 0.002921/0.628, allocations: 1.071 MB / 1.055 GB, free: 34.47 MB / 0.7136 GB Notification: Performance of NFFlatten.flatten: time 0.005493/0.6336, allocations: 5.546 MB / 1.061 GB, free: 32.24 MB / 0.7136 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002183/0.6358, allocations: 1.716 MB / 1.062 GB, free: 31.61 MB / 0.7136 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002619/0.6384, allocations: 1.556 MB / 1.064 GB, free: 31.01 MB / 0.7136 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0019/0.6403, allocations: 1.293 MB / 1.065 GB, free: 30.47 MB / 0.7136 GB Notification: Performance of NFPackage.collectConstants: time 0.0002225/0.6405, allocations: 69.75 kB / 1.065 GB, free: 30.47 MB / 0.7136 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002139/0.6427, allocations: 0.8912 MB / 1.066 GB, free: 30.25 MB / 0.7136 GB Notification: Performance of NFScalarize.scalarize: time 0.0003356/0.643, allocations: 375.6 kB / 1.066 GB, free: 30.07 MB / 0.7136 GB Notification: Performance of NFVerifyModel.verify: time 0.0004284/0.6435, allocations: 401 kB / 1.067 GB, free: 29.86 MB / 0.7136 GB Notification: Performance of NFConvertDAE.convert: time 0.002033/0.6455, allocations: 2.174 MB / 1.069 GB, free: 29.33 MB / 0.7136 GB Notification: Performance of FrontEnd - DAE generated: time 4.368e-06/0.6455, allocations: 0 / 1.069 GB, free: 29.33 MB / 0.7136 GB Notification: Performance of FrontEnd: time 1.704e-06/0.6455, allocations: 0 / 1.069 GB, free: 29.33 MB / 0.7136 GB Notification: Performance of Transformations before backend: time 2.412e-05/0.6456, allocations: 4 kB / 1.069 GB, free: 29.33 MB / 0.7136 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 235 * Number of variables: 235 Notification: Performance of Generate backend data structure: time 0.003018/0.6486, allocations: 2.069 MB / 1.071 GB, free: 27.99 MB / 0.7136 GB Notification: Performance of prepare preOptimizeDAE: time 3.393e-05/0.6486, allocations: 11.84 kB / 1.071 GB, free: 27.99 MB / 0.7136 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0009724/0.6496, allocations: 306.8 kB / 1.071 GB, free: 27.88 MB / 0.7136 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002235/0.6518, allocations: 1.651 MB / 1.073 GB, free: 27 MB / 0.7136 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.909e-05/0.6519, allocations: 78.25 kB / 1.073 GB, free: 26.96 MB / 0.7136 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001391/0.6521, allocations: 105 kB / 1.073 GB, free: 26.93 MB / 0.7136 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00185/0.6539, allocations: 1.335 MB / 1.074 GB, free: 26.31 MB / 0.7136 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.746e-05/0.654, allocations: 3.938 kB / 1.074 GB, free: 26.31 MB / 0.7136 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.78e-05/0.6541, allocations: 39.47 kB / 1.074 GB, free: 26.28 MB / 0.7136 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.731e-05/0.6541, allocations: 29.88 kB / 1.074 GB, free: 26.28 MB / 0.7136 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001793/0.6559, allocations: 1.062 MB / 1.075 GB, free: 25.92 MB / 0.7136 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 0.00661/0.6625, allocations: 6.979 MB / 1.082 GB, free: 20.7 MB / 0.7136 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001372/0.6639, allocations: 0.6752 MB / 1.083 GB, free: 20.46 MB / 0.7136 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0007509/0.6647, allocations: 428.5 kB / 1.083 GB, free: 20.32 MB / 0.7136 GB Notification: Performance of preOpt evalFunc (simulation): time 0.002809/0.6675, allocations: 1.828 MB / 1.085 GB, free: 19.06 MB / 0.7136 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.000827/0.6683, allocations: 413.3 kB / 1.085 GB, free: 18.91 MB / 0.7136 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.0005944/0.6689, allocations: 101.4 kB / 1.085 GB, free: 18.86 MB / 0.7136 GB Notification: Performance of pre-optimization done (n=46): time 2.465e-06/0.6689, allocations: 0 / 1.085 GB, free: 18.86 MB / 0.7136 GB Notification: Performance of matching and sorting (n=46): time 0.003888/0.6728, allocations: 1.541 MB / 1.087 GB, free: 18.34 MB / 0.7136 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.384e-05/0.6729, allocations: 61.41 kB / 1.087 GB, free: 18.27 MB / 0.7136 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002568/0.6755, allocations: 1.843 MB / 1.089 GB, free: 17.59 MB / 0.7136 GB Notification: Performance of collectPreVariables (initialization): time 8.603e-05/0.6756, allocations: 44.23 kB / 1.089 GB, free: 17.55 MB / 0.7136 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006764/0.6763, allocations: 0.8467 MB / 1.09 GB, free: 16.88 MB / 0.7136 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001334/0.6764, allocations: 164.5 kB / 1.09 GB, free: 16.75 MB / 0.7136 GB Notification: Performance of simplifyInitialFunctions (initialization): time 3.922e-05/0.6765, allocations: 20.12 kB / 1.09 GB, free: 16.74 MB / 0.7136 GB Notification: Performance of setup shared object (initialization): time 8.173e-05/0.6765, allocations: 334.4 kB / 1.09 GB, free: 16.43 MB / 0.7136 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0006208/0.6772, allocations: 322.3 kB / 1.091 GB, free: 16.33 MB / 0.7136 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0008094/0.678, allocations: 0.7704 MB / 1.091 GB, free: 15.64 MB / 0.7136 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001353/0.6794, allocations: 1.004 MB / 1.092 GB, free: 14.95 MB / 0.7136 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 6.492e-06/0.6794, allocations: 0 / 1.092 GB, free: 14.95 MB / 0.7136 GB Notification: Performance of matching and sorting (n=99) (initialization): time 0.002441/0.6818, allocations: 1.352 MB / 1.094 GB, free: 14.42 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001747/0.682, allocations: 434.7 kB / 1.094 GB, free: 13.88 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.445e-05/0.682, allocations: 11.81 kB / 1.094 GB, free: 13.88 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0007585/0.6828, allocations: 224.4 kB / 1.094 GB, free: 13.83 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0005953/0.6834, allocations: 178.2 kB / 1.094 GB, free: 13.82 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0006152/0.684, allocations: 0.8378 MB / 1.095 GB, free: 13.2 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001362/0.6854, allocations: 120.8 kB / 1.095 GB, free: 13.17 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.766e-05/0.6855, allocations: 50.61 kB / 1.095 GB, free: 13.16 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 8.536e-06/0.6855, allocations: 3.25 kB / 1.095 GB, free: 13.16 MB / 0.7136 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001572/0.6871, allocations: 1.03 MB / 1.096 GB, free: 12.76 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.136e-05/0.6871, allocations: 10.19 kB / 1.096 GB, free: 12.76 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0003369/0.6875, allocations: 159.2 kB / 1.097 GB, free: 12.72 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004916/0.688, allocations: 165.7 kB / 1.097 GB, free: 12.7 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002106/0.6901, allocations: 2.353 MB / 1.099 GB, free: 10.97 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001353/0.6914, allocations: 113 kB / 1.099 GB, free: 10.95 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.674e-05/0.6915, allocations: 45.75 kB / 1.099 GB, free: 10.94 MB / 0.7136 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 46 * Number of states: 0 () * Number of discrete variables: 8 ($whenCondition1,$PRE.pulse.T_start,pulse.T_start,$PRE.pulse.count,pulse.count,nRes.y,from_dp.y,mergeDp.y) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (85): * Single equations (assignments): 82 * Array equations: 1 * Algorithm blocks: 1 * 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: 0 * Non-linear torn systems: 1 {1 12} Notification: Performance of prepare postOptimizeDAE: time 0.0009704/0.6925, allocations: 0.5864 MB / 1.1 GB, free: 10.59 MB / 0.7136 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002499/0.6928, allocations: 173.6 kB / 1.1 GB, free: 10.5 MB / 0.7136 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001931/0.6947, allocations: 1.07 MB / 1.101 GB, free: 10.12 MB / 0.7136 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.227e-05/0.6947, allocations: 9.734 kB / 1.101 GB, free: 10.12 MB / 0.7136 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 2.214e-06/0.6947, allocations: 0 / 1.101 GB, free: 10.12 MB / 0.7136 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001402/0.6961, allocations: 1.032 MB / 1.102 GB, free: 9.531 MB / 0.7136 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 postOpt removeSimpleEquations (simulation): time 0.003441/0.6996, allocations: 2.32 MB / 1.104 GB, free: 8.457 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.288e-06/0.6996, allocations: 4.062 kB / 1.104 GB, free: 8.453 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004327/0.7, allocations: 93.7 kB / 1.104 GB, free: 8.445 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0003024/0.7004, allocations: 148.5 kB / 1.104 GB, free: 8.406 MB / 0.7136 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 3.883e-05/0.7004, allocations: 19.62 kB / 1.104 GB, free: 8.398 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0004867/0.7009, allocations: 0.8034 MB / 1.105 GB, free: 7.785 MB / 0.7136 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.914e-06/0.7009, allocations: 3.938 kB / 1.105 GB, free: 7.781 MB / 0.7136 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002276/0.7032, allocations: 1.484 MB / 1.107 GB, free: 7.133 MB / 0.7136 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005841/0.7038, allocations: 345.6 kB / 1.107 GB, free: 6.895 MB / 0.7136 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000169/0.704, allocations: 7.188 kB / 1.107 GB, free: 6.891 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0008683/0.7048, allocations: 100.8 kB / 1.107 GB, free: 6.871 MB / 0.7136 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001016/0.705, allocations: 40.53 kB / 1.107 GB, free: 6.863 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.998e-05/0.705, allocations: 24.45 kB / 1.107 GB, free: 6.859 MB / 0.7136 GB Notification: Performance of sorting global known variables: time 0.001515/0.7065, allocations: 1.275 MB / 1.108 GB, free: 6.383 MB / 0.7136 GB Notification: Performance of sort global known variables: time 1.6e-07/0.7065, allocations: 0 / 1.108 GB, free: 6.383 MB / 0.7136 GB Notification: Performance of remove unused functions: time 0.002178/0.7087, allocations: 0.8435 MB / 1.109 GB, free: 6.242 MB / 0.7136 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 3 * Number of states: 1 (pump.vol.dynBal.U) * Number of discrete variables: 3 ($whenCondition1,pulse.T_start,pulse.count) * Number of discrete states: 1 (pulse.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (40): * Single equations (assignments): 34 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 3 * When equations: 2 * 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: 0 * Non-linear torn systems: 1 {1 12} Notification: Performance of Backend phase and start with SimCode phase: time 0.0007717/0.7095, allocations: 380.9 kB / 1.11 GB, free: 6.074 MB / 0.7136 GB Notification: Performance of simCode: created initialization part: time 0.002596/0.7121, allocations: 1.531 MB / 1.111 GB, free: 5.414 MB / 0.7136 GB Notification: Performance of simCode: created event and clocks part: time 4.278e-06/0.7121, allocations: 1.375 kB / 1.111 GB, free: 5.414 MB / 0.7136 GB Notification: Performance of simCode: created simulation system equations: time 0.0006924/0.7128, allocations: 368.5 kB / 1.111 GB, free: 5.305 MB / 0.7136 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00365/0.7165, allocations: 0.839 MB / 1.112 GB, free: 5.125 MB / 0.7136 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004206/0.7207, allocations: 3.458 MB / 1.116 GB, free: 3.332 MB / 0.7136 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0009229/0.7216, allocations: 1.501 MB / 1.117 GB, free: 2.52 MB / 0.7136 GB Notification: Performance of simCode: alias equations: time 0.001623/0.7233, allocations: 431.6 kB / 1.118 GB, free: 2.457 MB / 0.7136 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003171/0.7236, allocations: 129.3 kB / 1.118 GB, free: 2.441 MB / 0.7136 GB Notification: Performance of SimCode: time 5.41e-07/0.7236, allocations: 0 / 1.118 GB, free: 2.441 MB / 0.7136 GB Notification: Performance of Templates: time 0.06383/0.7875, allocations: 32.18 MB / 1.149 GB, free: 11.93 MB / 0.7292 GB make -j1 -f Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.makefile (rm -f Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.pipe ; mkfifo Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.pipe ; head -c 1048576 < Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.pipe >> ../files/Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.sim & ./Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3 -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_8.0.0_Buildings.Fluid.Examples.Performance.Example3.pipe 2>&1)