Running: ./testmodel.py --libraries=/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.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.HeatExchangers.Examples.AirHeater_T,tolerance=1e-08,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T") translateModel(Buildings.Fluid.HeatExchangers.Examples.AirHeater_T,tolerance=1e-08,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T") Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo): time 1.79/1.79, allocations: 291.7 MB / 306.8 MB, free: 7.645 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 0.001123/0.001124, allocations: 193.3 kB / 375.4 MB, free: 5.094 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 1.41/1.41, allocations: 225.7 MB / 0.6538 GB, free: 13.59 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 0.0008504/0.0008505, allocations: 106.3 kB / 0.7699 GB, free: 50.5 MB / 0.5417 GB Notification: Performance of FrontEnd - loaded program: time 0.0004032/0.0004033, allocations: 12 kB / 0.8956 GB, free: 11.88 MB / 0.6198 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.7273/0.7278, allocations: 118.1 MB / 1.011 GB, free: 58.15 MB / 0.7136 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatExchangers.Examples.AirHeater_T): time 0.2203/0.9481, allocations: 215.2 MB / 1.221 GB, free: 7.227 MB / 0.8073 GB Notification: Performance of NFInst.instExpressions: time 0.02675/0.9749, allocations: 17.19 MB / 1.238 GB, free: 11.32 MB / 0.823 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.003867/0.9788, allocations: 72.81 kB / 1.238 GB, free: 11.29 MB / 0.823 GB Notification: Performance of NFTyping.typeComponents: time 0.004352/0.9832, allocations: 0.8934 MB / 1.239 GB, free: 10.83 MB / 0.823 GB Notification: Performance of NFTyping.typeBindings: time 0.01059/0.9938, allocations: 2.525 MB / 1.241 GB, free: 9.465 MB / 0.823 GB Notification: Performance of NFTyping.typeClassSections: time 0.01189/1.006, allocations: 2.873 MB / 1.244 GB, free: 8.223 MB / 0.823 GB Notification: Performance of NFFlatten.flatten: time 0.01085/1.017, allocations: 5.645 MB / 1.25 GB, free: 3.98 MB / 0.823 GB Notification: Performance of NFFlatten.resolveConnections: time 0.004626/1.021, allocations: 1.578 MB / 1.251 GB, free: 2.742 MB / 0.823 GB Notification: Performance of NFEvalConstants.evaluate: time 0.007926/1.029, allocations: 2.134 MB / 1.253 GB, free: 0.9453 MB / 0.823 GB Notification: Performance of NFSimplifyModel.simplify: time 0.004012/1.033, allocations: 1.487 MB / 1.255 GB, free: 15.71 MB / 0.8386 GB Notification: Performance of NFPackage.collectConstants: time 0.0008492/1.034, allocations: 80 kB / 1.255 GB, free: 15.64 MB / 0.8386 GB Notification: Performance of NFFlatten.collectFunctions: time 0.008394/1.043, allocations: 2.226 MB / 1.257 GB, free: 13.9 MB / 0.8386 GB Notification: Performance of NFScalarize.scalarize: time 0.002018/1.045, allocations: 0.6221 MB / 1.258 GB, free: 13.47 MB / 0.8386 GB Notification: Performance of NFVerifyModel.verify: time 0.001813/1.046, allocations: 464.5 kB / 1.258 GB, free: 13.01 MB / 0.8386 GB Notification: Performance of NFConvertDAE.convert: time 0.007965/1.054, allocations: 3.1 MB / 1.261 GB, free: 10.49 MB / 0.8386 GB Notification: Performance of FrontEnd - DAE generated: time 7.244e-06/1.054, allocations: 0 / 1.261 GB, free: 10.49 MB / 0.8386 GB Notification: Performance of FrontEnd: time 2.766e-06/1.054, allocations: 0 / 1.261 GB, free: 10.49 MB / 0.8386 GB Notification: Performance of Transformations before backend: time 0.000161/1.055, allocations: 0 / 1.261 GB, free: 10.49 MB / 0.8386 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 334 * Number of variables: 334 Notification: Performance of Generate backend data structure: time 0.006385/1.061, allocations: 2.484 MB / 1.263 GB, free: 7.938 MB / 0.8386 GB Notification: Performance of prepare preOptimizeDAE: time 4.918e-05/1.061, allocations: 12.03 kB / 1.263 GB, free: 7.926 MB / 0.8386 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004986/1.066, allocations: 0.8107 MB / 1.264 GB, free: 7.113 MB / 0.8386 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.003448/1.07, allocations: 1.649 MB / 1.266 GB, free: 5.414 MB / 0.8386 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0003818/1.07, allocations: 178.8 kB / 1.266 GB, free: 5.238 MB / 0.8386 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002432/1.07, allocations: 147.9 kB / 1.266 GB, free: 5.094 MB / 0.8386 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00339/1.074, allocations: 1.695 MB / 1.268 GB, free: 3.32 MB / 0.8386 GB Notification: Performance of preOpt findStateOrder (simulation): time 3.253e-05/1.074, allocations: 3.938 kB / 1.268 GB, free: 3.316 MB / 0.8386 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001337/1.074, allocations: 62.11 kB / 1.268 GB, free: 3.258 MB / 0.8386 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.059e-05/1.074, allocations: 50.47 kB / 1.268 GB, free: 3.207 MB / 0.8386 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003328/1.077, allocations: 1.489 MB / 1.269 GB, free: 1.711 MB / 0.8386 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 0.01097/1.088, allocations: 7.624 MB / 1.277 GB, free: 9.535 MB / 0.8542 GB Notification: Performance of preOpt comSubExp (simulation): time 0.00265/1.091, allocations: 1.662 MB / 1.278 GB, free: 7.738 MB / 0.8542 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001066/1.092, allocations: 0.5399 MB / 1.279 GB, free: 7.199 MB / 0.8542 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001283/1.093, allocations: 0.8142 MB / 1.28 GB, free: 6.238 MB / 0.8542 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001193/1.094, allocations: 0.579 MB / 1.28 GB, free: 5.648 MB / 0.8542 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.0009251/1.095, allocations: 119.2 kB / 1.28 GB, free: 5.531 MB / 0.8542 GB Notification: Performance of pre-optimization done (n=84): time 3.236e-06/1.095, allocations: 6.438 kB / 1.28 GB, free: 5.527 MB / 0.8542 GB Notification: Performance of matching and sorting (n=84): time 0.005235/1.101, allocations: 1.664 MB / 1.282 GB, free: 3.832 MB / 0.8542 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001037/1.101, allocations: 141.5 kB / 1.282 GB, free: 3.664 MB / 0.8542 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003357/1.104, allocations: 1.62 MB / 1.284 GB, free: 1.996 MB / 0.8542 GB Notification: Performance of collectPreVariables (initialization): time 0.0001937/1.104, allocations: 49.7 kB / 1.284 GB, free: 1.941 MB / 0.8542 GB Notification: Performance of collectInitialEqns (initialization): time 0.00121/1.106, allocations: 0.9243 MB / 1.285 GB, free: 1.008 MB / 0.8542 GB Notification: Performance of collectInitialBindings (initialization): time 0.0004096/1.106, allocations: 303.7 kB / 1.285 GB, free: 0.707 MB / 0.8542 GB Notification: Performance of simplifyInitialFunctions (initialization): time 8.313e-05/1.106, allocations: 20 kB / 1.285 GB, free: 0.6875 MB / 0.8542 GB Notification: Performance of setup shared object (initialization): time 0.000203/1.106, allocations: 353.9 kB / 1.285 GB, free: 344 kB / 0.8542 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001556/1.108, allocations: 466.3 kB / 1.286 GB, free: 15.88 MB / 0.8698 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001797/1.11, allocations: 0.8391 MB / 1.287 GB, free: 14.89 MB / 0.8698 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.003189/1.113, allocations: 1.251 MB / 1.288 GB, free: 13.51 MB / 0.8698 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.124e-05/1.113, allocations: 4 kB / 1.288 GB, free: 13.51 MB / 0.8698 GB Notification: Performance of matching and sorting (n=138) (initialization): time 0.004988/1.118, allocations: 1.481 MB / 1.289 GB, free: 12.02 MB / 0.8698 GB Notification: Performance of prepare postOptimizeDAE: time 0.000461/1.118, allocations: 373.7 kB / 1.29 GB, free: 11.52 MB / 0.8698 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 3.734e-05/1.118, allocations: 9.438 kB / 1.29 GB, free: 11.52 MB / 0.8698 GB Notification: Performance of postOpt tearingSystem (initialization): time 4.168e-05/1.119, allocations: 12 kB / 1.29 GB, free: 11.5 MB / 0.8698 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001636/1.12, allocations: 283.6 kB / 1.29 GB, free: 11.23 MB / 0.8698 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 4.085e-05/1.12, allocations: 21.58 kB / 1.29 GB, free: 11.21 MB / 0.8698 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002845/1.123, allocations: 171.6 kB / 1.29 GB, free: 11.04 MB / 0.8698 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001513/1.123, allocations: 47.98 kB / 1.29 GB, free: 11 MB / 0.8698 GB Notification: Performance of prepare postOptimizeDAE: time 1.667e-05/1.123, allocations: 4 kB / 1.29 GB, free: 10.99 MB / 0.8698 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.003874/1.127, allocations: 1.294 MB / 1.291 GB, free: 9.695 MB / 0.8698 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 3.099e-05/1.127, allocations: 12 kB / 1.291 GB, free: 9.684 MB / 0.8698 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.141e-05/1.127, allocations: 12 kB / 1.291 GB, free: 9.672 MB / 0.8698 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001525/1.129, allocations: 281.7 kB / 1.292 GB, free: 9.398 MB / 0.8698 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 3.239e-05/1.129, allocations: 19.94 kB / 1.292 GB, free: 9.379 MB / 0.8698 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002545/1.131, allocations: 169.8 kB / 1.292 GB, free: 9.215 MB / 0.8698 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001347/1.132, allocations: 53.86 kB / 1.292 GB, free: 9.164 MB / 0.8698 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 37 * Number of states: 0 () * Number of discrete variables: 6 ($whenCondition1,$PRE.TSet.T_start,TSet.T_start,$PRE.TSet.count,TSet.count,conPI.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (134): * Single equations (assignments): 130 * Array equations: 2 * Algorithm blocks: 1 * Record equations: 1 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.001535/1.133, allocations: 0.5358 MB / 1.292 GB, free: 8.617 MB / 0.8698 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005129/1.134, allocations: 181.8 kB / 1.293 GB, free: 8.438 MB / 0.8698 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.003833/1.137, allocations: 1.225 MB / 1.294 GB, free: 7.199 MB / 0.8698 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.861e-05/1.138, allocations: 8 kB / 1.294 GB, free: 7.191 MB / 0.8698 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.445e-05/1.138, allocations: 0 / 1.294 GB, free: 7.191 MB / 0.8698 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.003232/1.141, allocations: 1.285 MB / 1.295 GB, free: 5.812 MB / 0.8698 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 0.008456/1.149, allocations: 2.97 MB / 1.298 GB, free: 2.734 MB / 0.8698 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 8.206e-06/1.149, allocations: 0 / 1.298 GB, free: 2.734 MB / 0.8698 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001313/1.151, allocations: 199.9 kB / 1.298 GB, free: 2.539 MB / 0.8698 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0003256/1.151, allocations: 52.83 kB / 1.298 GB, free: 2.484 MB / 0.8698 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 9.377e-05/1.151, allocations: 23.98 kB / 1.298 GB, free: 2.461 MB / 0.8698 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001743/1.153, allocations: 1.425 MB / 1.3 GB, free: 0.9023 MB / 0.8698 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.756e-06/1.153, allocations: 0 / 1.3 GB, free: 0.9023 MB / 0.8698 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005198/1.158, allocations: 1.852 MB / 1.301 GB, free: 15.02 MB / 0.8855 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001204/1.159, allocations: 353.4 kB / 1.302 GB, free: 14.66 MB / 0.8855 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002614/1.16, allocations: 16 kB / 1.302 GB, free: 14.64 MB / 0.8855 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001645/1.161, allocations: 157.1 kB / 1.302 GB, free: 14.49 MB / 0.8855 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001937/1.161, allocations: 64.52 kB / 1.302 GB, free: 14.43 MB / 0.8855 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 9.759e-05/1.161, allocations: 35.97 kB / 1.302 GB, free: 14.39 MB / 0.8855 GB Notification: Performance of sorting global known variables: time 0.002357/1.164, allocations: 1.085 MB / 1.303 GB, free: 13.28 MB / 0.8855 GB Notification: Performance of sort global known variables: time 3.8e-07/1.164, allocations: 0 / 1.303 GB, free: 13.28 MB / 0.8855 GB Notification: Performance of remove unused functions: time 0.004157/1.168, allocations: 1.017 MB / 1.304 GB, free: 12.26 MB / 0.8855 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 5 * Number of states: 8 (vol.dynBal.U,vol.dynBal.m,vol.dynBal.mXi[1],mov.filter.x[1],mov.filter.x[2],conPI.I.y,THeaOut.T,hea.outCon.T) * Number of discrete variables: 3 ($whenCondition1,TSet.T_start,TSet.count) * Number of discrete states: 1 (TSet.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (84): * Single equations (assignments): 81 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * 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: 1 {(1,100.0%) 2} * Non-linear torn systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.002448/1.171, allocations: 0.6893 MB / 1.305 GB, free: 11.73 MB / 0.8855 GB Notification: Performance of simCode: created initialization part: time 0.005117/1.176, allocations: 1.942 MB / 1.307 GB, free: 9.75 MB / 0.8855 GB Notification: Performance of simCode: created event and clocks part: time 5.961e-06/1.176, allocations: 0 / 1.307 GB, free: 9.75 MB / 0.8855 GB Notification: Performance of simCode: created simulation system equations: time 0.001366/1.177, allocations: 0.6316 MB / 1.307 GB, free: 9.105 MB / 0.8855 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.004754/1.182, allocations: 0.7985 MB / 1.308 GB, free: 8.32 MB / 0.8855 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.009776/1.192, allocations: 4.465 MB / 1.312 GB, free: 3.824 MB / 0.8855 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.00175/1.193, allocations: 1.511 MB / 1.314 GB, free: 2.273 MB / 0.8855 GB Notification: Performance of simCode: alias equations: time 0.0026/1.196, allocations: 451.1 kB / 1.314 GB, free: 1.844 MB / 0.8855 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0005672/1.197, allocations: 135.4 kB / 1.315 GB, free: 1.711 MB / 0.8855 GB Notification: Performance of SimCode: time 9.52e-07/1.197, allocations: 0 / 1.315 GB, free: 1.711 MB / 0.8855 GB Notification: Performance of Templates: time 0.0609/1.258, allocations: 31.87 MB / 1.346 GB, free: 2.363 MB / 0.9167 GB make -j1 -f Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.makefile (rm -f Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.pipe ; mkfifo Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.pipe ; head -c 1048576 < Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.pipe >> ../files/Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.sim & ./Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_8.0.0_Buildings.Fluid.HeatExchangers.Examples.AirHeater_T.pipe 2>&1)