Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+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/ModelicaServices 3.2.3+maint.om/package.mo", uses=false) Using package ModelicaServices with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/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 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo) Using package Buildings with version 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo) Running command: "" <> buildModelFMU(Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature,fileNamePrefix="Buildings_maint_7_0_x_Buildings_Fluid_Storage_Examples_StratifiedUnloadAtMinimumTemperature",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature,fileNamePrefix="Buildings_maint_7_0_x_Buildings_Fluid_Storage_Examples_StratifiedUnloadAtMinimumTemperature",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.524/1.524, allocations: 251.9 MB / 266.9 MB, free: 11.05 MB / 218.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001184/0.001184, allocations: 192.6 kB / 326.5 MB, free: 2.242 MB / 250.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.726/1.726, allocations: 205.4 MB / 0.5775 GB, free: 20.23 MB / 426.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0008637/0.0008637, allocations: 97.72 kB / 0.6821 GB, free: 12.89 MB / 0.5105 GB Notification: Performance of FrontEnd - loaded program: time 0.0003711/0.0003712, allocations: 9.406 kB / 0.7963 GB, free: 135.1 MB / 0.6042 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2501/0.2504, allocations: 106.4 MB / 0.9001 GB, free: 63.86 MB / 0.6042 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature): time 0.02477/0.2753, allocations: 31.87 MB / 0.9313 GB, free: 31.89 MB / 0.6042 GB Notification: Performance of NFInst.instExpressions: time 0.01473/0.2901, allocations: 11.04 MB / 0.9421 GB, free: 20.84 MB / 0.6042 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001957/0.2921, allocations: 43.69 kB / 0.9421 GB, free: 20.8 MB / 0.6042 GB Notification: Performance of NFTyping.typeComponents: time 0.00195/0.294, allocations: 0.6609 MB / 0.9427 GB, free: 20.13 MB / 0.6042 GB Notification: Performance of NFTyping.typeBindings: time 0.004996/0.299, allocations: 1.548 MB / 0.9443 GB, free: 18.58 MB / 0.6042 GB Notification: Performance of NFTyping.typeClassSections: time 0.007843/0.3069, allocations: 2.513 MB / 0.9467 GB, free: 16.1 MB / 0.6042 GB Notification: Performance of NFFlatten.flatten: time 0.006604/0.3135, allocations: 4.424 MB / 0.951 GB, free: 11.67 MB / 0.6042 GB Notification: Performance of NFFlatten.resolveConnections: time 0.004059/0.3176, allocations: 2.74 MB / 0.9537 GB, free: 8.887 MB / 0.6042 GB Notification: Performance of NFEvalConstants.evaluate: time 0.004109/0.3217, allocations: 1.83 MB / 0.9555 GB, free: 7.051 MB / 0.6042 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002907/0.3247, allocations: 1.54 MB / 0.957 GB, free: 5.504 MB / 0.6042 GB Notification: Performance of NFPackage.collectConstants: time 0.0004369/0.3251, allocations: 139.9 kB / 0.9571 GB, free: 5.367 MB / 0.6042 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002878/0.328, allocations: 0.6711 MB / 0.9578 GB, free: 4.695 MB / 0.6042 GB Notification: Performance of NFScalarize.scalarize: time 0.0005978/0.3286, allocations: 0.5604 MB / 0.9583 GB, free: 4.133 MB / 0.6042 GB Notification: Performance of NFVerifyModel.verify: time 0.001473/0.3301, allocations: 0.6408 MB / 0.959 GB, free: 3.484 MB / 0.6042 GB Notification: Performance of NFConvertDAE.convert: time 0.004372/0.3345, allocations: 3.885 MB / 0.9627 GB, free: 15.59 MB / 0.6198 GB Notification: Performance of FrontEnd - DAE generated: time 4.028e-06/0.3345, allocations: 0 / 0.9627 GB, free: 15.59 MB / 0.6198 GB Notification: Performance of FrontEnd: time 4.077e-06/0.3345, allocations: 0 / 0.9627 GB, free: 15.59 MB / 0.6198 GB Notification: Performance of Transformations before backend: time 0.0001267/0.3347, allocations: 0 / 0.9627 GB, free: 15.59 MB / 0.6198 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 586 * Number of variables: 586 Notification: Performance of Generate backend data structure: time 0.006793/0.3415, allocations: 2.98 MB / 0.9657 GB, free: 12.54 MB / 0.6198 GB Notification: Performance of prepare preOptimizeDAE: time 5.636e-05/0.3415, allocations: 8.031 kB / 0.9657 GB, free: 12.54 MB / 0.6198 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0007756/0.3423, allocations: 344.8 kB / 0.966 GB, free: 12.19 MB / 0.6198 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001125/0.3435, allocations: 352 kB / 0.9663 GB, free: 11.84 MB / 0.6198 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.005419/0.3489, allocations: 2.349 MB / 0.9686 GB, free: 9.441 MB / 0.6198 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001633/0.3491, allocations: 176.6 kB / 0.9688 GB, free: 9.266 MB / 0.6198 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0003566/0.3494, allocations: 236 kB / 0.969 GB, free: 9.035 MB / 0.6198 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.005682/0.3551, allocations: 3.171 MB / 0.9721 GB, free: 5.719 MB / 0.6198 GB Notification: Performance of preOpt findStateOrder (simulation): time 4.963e-05/0.3552, allocations: 4 kB / 0.9721 GB, free: 5.715 MB / 0.6198 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0002313/0.3554, allocations: 100 kB / 0.9722 GB, free: 5.617 MB / 0.6198 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 8.368e-05/0.3555, allocations: 71.88 kB / 0.9723 GB, free: 5.547 MB / 0.6198 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.004515/0.3601, allocations: 2.566 MB / 0.9748 GB, free: 2.965 MB / 0.6198 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 0.02075/0.3808, allocations: 13.81 MB / 0.9883 GB, free: 4.082 MB / 0.6355 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002577/0.3834, allocations: 1.61 MB / 0.9898 GB, free: 2.465 MB / 0.6355 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0008922/0.3843, allocations: 0.7283 MB / 0.9906 GB, free: 1.59 MB / 0.6355 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.943e-05/0.3844, allocations: 51.56 kB / 0.9906 GB, free: 1.531 MB / 0.6355 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.001535/0.3859, allocations: 195.8 kB / 0.9908 GB, free: 1.34 MB / 0.6355 GB Notification: Performance of pre-optimization done (n=126): time 5.009e-06/0.386, allocations: 0 / 0.9908 GB, free: 1.34 MB / 0.6355 GB Notification: Performance of matching and sorting (n=126): time 0.008644/0.3946, allocations: 3.388 MB / 0.9941 GB, free: 13.9 MB / 0.6511 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001157/0.3948, allocations: 145.5 kB / 0.9942 GB, free: 13.73 MB / 0.6511 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.00344/0.3982, allocations: 2.091 MB / 0.9963 GB, free: 11.59 MB / 0.6511 GB Notification: Performance of collectPreVariables (initialization): time 0.0002254/0.3985, allocations: 57.69 kB / 0.9963 GB, free: 11.53 MB / 0.6511 GB Notification: Performance of collectInitialEqns (initialization): time 0.001356/0.3998, allocations: 1.25 MB / 0.9976 GB, free: 10.27 MB / 0.6511 GB Notification: Performance of collectInitialBindings (initialization): time 0.0005293/0.4004, allocations: 445.7 kB / 0.998 GB, free: 9.824 MB / 0.6511 GB Notification: Performance of simplifyInitialFunctions (initialization): time 8.173e-05/0.4004, allocations: 36 kB / 0.998 GB, free: 9.789 MB / 0.6511 GB Notification: Performance of setup shared object (initialization): time 0.0002168/0.4007, allocations: 373.9 kB / 0.9984 GB, free: 9.418 MB / 0.6511 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.00124/0.4019, allocations: 0.7339 MB / 0.9991 GB, free: 8.684 MB / 0.6511 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001549/0.4035, allocations: 1.233 MB / 1 GB, free: 7.234 MB / 0.6511 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001438/0.4049, allocations: 0.9588 MB / 1.001 GB, free: 6.277 MB / 0.6511 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 9.348e-06/0.4049, allocations: 4 kB / 1.001 GB, free: 6.273 MB / 0.6511 GB Notification: Performance of matching and sorting (n=213) (initialization): time 0.004166/0.4091, allocations: 2.422 MB / 1.004 GB, free: 3.836 MB / 0.6511 GB Notification: Performance of prepare postOptimizeDAE: time 0.002644/0.4118, allocations: 5.693 MB / 1.009 GB, free: 13.68 MB / 0.6667 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.886e-05/0.4118, allocations: 16 kB / 1.009 GB, free: 13.66 MB / 0.6667 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.002102/0.4139, allocations: 0.4962 MB / 1.01 GB, free: 13.16 MB / 0.6667 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001537/0.4155, allocations: 343.4 kB / 1.01 GB, free: 12.82 MB / 0.6667 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003604/0.4191, allocations: 3.165 MB / 1.013 GB, free: 9.496 MB / 0.6667 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002596/0.4217, allocations: 231.4 kB / 1.013 GB, free: 9.27 MB / 0.6667 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002281/0.422, allocations: 83.92 kB / 1.013 GB, free: 9.188 MB / 0.6667 GB Notification: Performance of prepare postOptimizeDAE: time 1.198e-05/0.422, allocations: 8 kB / 1.013 GB, free: 9.18 MB / 0.6667 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.003817/0.4258, allocations: 2.191 MB / 1.016 GB, free: 6.98 MB / 0.6667 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.249e-05/0.4259, allocations: 16 kB / 1.016 GB, free: 6.965 MB / 0.6667 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0006237/0.4265, allocations: 249.9 kB / 1.016 GB, free: 6.715 MB / 0.6667 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001323/0.4278, allocations: 363.4 kB / 1.016 GB, free: 6.359 MB / 0.6667 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.004797/0.4326, allocations: 4.208 MB / 1.02 GB, free: 1.883 MB / 0.6667 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002681/0.4353, allocations: 227.5 kB / 1.02 GB, free: 1.66 MB / 0.6667 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002428/0.4356, allocations: 75.98 kB / 1.021 GB, free: 1.586 MB / 0.6667 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 63 * Number of states: 0 () * Number of discrete variables: 8 ($PRE.onOffBot.y,onOffBot.y,$PRE.onOffMid.y,onOffMid.y,and2.y,yTop.u,$PRE.onOffHea.y,onOffHea.y) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (179): * Single equations (assignments): 177 * 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: 2 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 1 {(1,100.0%) 10} * Non-linear torn systems: 1 {3 22} Notification: Performance of prepare postOptimizeDAE: time 0.002222/0.4378, allocations: 1.004 MB / 1.022 GB, free: 0.5703 MB / 0.6667 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0006401/0.4385, allocations: 205.4 kB / 1.022 GB, free: 376 kB / 0.6667 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.003864/0.4424, allocations: 2.087 MB / 1.024 GB, free: 14.27 MB / 0.6823 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.15e-05/0.4424, allocations: 12 kB / 1.024 GB, free: 14.26 MB / 0.6823 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.214e-06/0.4424, allocations: 7.938 kB / 1.024 GB, free: 14.25 MB / 0.6823 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.002496/0.4449, allocations: 1.679 MB / 1.025 GB, free: 12.56 MB / 0.6823 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.009752/0.4547, allocations: 4.66 MB / 1.03 GB, free: 7.805 MB / 0.6823 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.464e-06/0.4547, allocations: 0 / 1.03 GB, free: 7.805 MB / 0.6823 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0009159/0.4557, allocations: 203.7 kB / 1.03 GB, free: 7.605 MB / 0.6823 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001551/0.4572, allocations: 429.3 kB / 1.031 GB, free: 7.18 MB / 0.6823 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001118/0.4574, allocations: 35.98 kB / 1.031 GB, free: 7.145 MB / 0.6823 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.003198/0.4606, allocations: 3.073 MB / 1.034 GB, free: 3.918 MB / 0.6823 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.326e-06/0.4606, allocations: 4.016 kB / 1.034 GB, free: 3.914 MB / 0.6823 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005439/0.466, allocations: 3.059 MB / 1.037 GB, free: 0.7891 MB / 0.6823 GB Notification: Performance of postOpt removeConstants (simulation): time 0.002085/0.4682, allocations: 0.5373 MB / 1.037 GB, free: 236 kB / 0.6823 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0004485/0.4686, allocations: 36 kB / 1.037 GB, free: 200 kB / 0.6823 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001581/0.4702, allocations: 200.7 kB / 1.037 GB, free: 4 kB / 0.6823 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002719/0.4705, allocations: 101.1 kB / 1.037 GB, free: 15.91 MB / 0.698 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001245/0.4707, allocations: 55.95 kB / 1.037 GB, free: 15.85 MB / 0.698 GB Notification: Performance of sorting global known variables: time 0.00243/0.4731, allocations: 1.447 MB / 1.039 GB, free: 14.38 MB / 0.698 GB Notification: Performance of sort global known variables: time 5.41e-07/0.4731, allocations: 0 / 1.039 GB, free: 14.38 MB / 0.698 GB Notification: Performance of remove unused functions: time 0.004427/0.4775, allocations: 1.492 MB / 1.04 GB, free: 12.89 MB / 0.698 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 4 * Number of states: 5 (tan.vol[1].dynBal.U,tan.vol[2].dynBal.U,tan.vol[3].dynBal.U,tan.vol[4].dynBal.U,tan.vol[5].dynBal.U) * Number of discrete variables: 5 (onOffBot.y,onOffMid.y,and2.y,yTop.u,onOffHea.y) * Number of discrete states: 3 (onOffBot.y,onOffMid.y,onOffHea.y) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (102): * Single equations (assignments): 96 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 4 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 2 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 1 {(1,100.0%) 10} * Non-linear torn systems: 1 {3 20} Notification: Performance of Backend phase and start with SimCode phase: time 0.005869/0.4834, allocations: 4.062 MB / 1.044 GB, free: 8.777 MB / 0.698 GB Notification: Performance of simCode: created initialization part: time 0.005938/0.4894, allocations: 3.376 MB / 1.048 GB, free: 5.367 MB / 0.698 GB Notification: Performance of simCode: created event and clocks part: time 7.193e-06/0.4894, allocations: 1.875 kB / 1.048 GB, free: 5.367 MB / 0.698 GB Notification: Performance of simCode: created simulation system equations: time 0.001532/0.491, allocations: 1.028 MB / 1.049 GB, free: 4.332 MB / 0.698 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00641/0.4974, allocations: 1.134 MB / 1.05 GB, free: 3.211 MB / 0.698 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.4446/0.9421, allocations: 17.21 MB / 1.067 GB, free: 129.5 MB / 0.698 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001985/0.9441, allocations: 2.202 MB / 1.069 GB, free: 128.7 MB / 0.698 GB Notification: Performance of simCode: alias equations: time 0.003452/0.9476, allocations: 0.9526 MB / 1.07 GB, free: 128.7 MB / 0.698 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001551/0.9491, allocations: 1.015 MB / 1.071 GB, free: 128.7 MB / 0.698 GB Notification: Performance of SimCode: time 1.333e-06/0.9491, allocations: 0 / 1.071 GB, free: 128.7 MB / 0.698 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.1154/1.065, allocations: 66.16 MB / 1.135 GB, free: 80.84 MB / 0.698 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001973/1.065, allocations: 279.2 kB / 1.135 GB, free: 80.48 MB / 0.698 GB Notification: Performance of buildModelFMU: Generate platform static: time 4.461/5.526, allocations: 0 / 1.135 GB, free: 80.48 MB / 0.698 GB (rm -f Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_Buildings_maint_7_0_x_Buildings_Fluid_Storage_Examples_StratifiedUnloadAtMinimumTemperature_fmu --startTime=0 --stopTime=21600 --timeout=50 --tolerance=1e-06 Buildings_maint_7_0_x_Buildings_Fluid_Storage_Examples_StratifiedUnloadAtMinimumTemperature.fmu > Buildings_maint.7.0.x_Buildings.Fluid.Storage.Examples.StratifiedUnloadAtMinimumTemperature.pipe 2>&1)