Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.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/IDEAS 3.0.0-master/package.mo", uses=false) Using package IDEAS with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-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(IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU") translateModel(IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.002234/0.002234, allocations: 107.8 kB / 16.41 MB, free: 6.504 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.00232/0.00232, allocations: 185.6 kB / 17.34 MB, free: 5.758 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.475/1.475, allocations: 222.9 MB / 241 MB, free: 15.15 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-master/package.mo): time 0.8499/0.8499, allocations: 135.2 MB / 426.4 MB, free: 4.078 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001946/0.001946, allocations: 63.48 kB / 0.5863 GB, free: 21.59 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1753/0.1772, allocations: 80.94 MB / 0.6654 GB, free: 5.73 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU): time 0.8143/0.9915, allocations: 356.4 MB / 1.013 GB, free: 10.32 MB / 0.7794 GB Notification: Performance of NFInst.instExpressions: time 0.05109/1.043, allocations: 31.9 MB / 1.045 GB, free: 10.34 MB / 0.8106 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.006446/1.049, allocations: 163 kB / 1.045 GB, free: 10.18 MB / 0.8106 GB Notification: Performance of NFTyping.typeComponents: time 0.009175/1.058, allocations: 3.002 MB / 1.048 GB, free: 7.156 MB / 0.8106 GB Notification: Performance of NFTyping.typeBindings: time 0.5186/1.577, allocations: 8.528 MB / 1.056 GB, free: 8.445 MB / 0.8106 GB Notification: Performance of NFTyping.typeClassSections: time 0.01066/1.588, allocations: 4.146 MB / 1.06 GB, free: 8.391 MB / 0.8106 GB Notification: Performance of NFFlatten.flatten: time 0.02162/1.609, allocations: 12.58 MB / 1.072 GB, free: 8.375 MB / 0.8106 GB Notification: Performance of NFFlatten.resolveConnections: time 0.008721/1.618, allocations: 3.8 MB / 1.076 GB, free: 24.12 MB / 0.8262 GB Notification: Performance of NFEvalConstants.evaluate: time 0.02006/1.638, allocations: 7.606 MB / 1.083 GB, free: 24.12 MB / 0.8262 GB Notification: Performance of NFSimplifyModel.simplify: time 0.009406/1.647, allocations: 3.998 MB / 1.087 GB, free: 23.86 MB / 0.8262 GB Notification: Performance of NFPackage.collectConstants: time 0.002603/1.65, allocations: 0.5163 MB / 1.088 GB, free: 23.86 MB / 0.8262 GB Notification: Performance of NFFlatten.collectFunctions: time 0.01441/1.664, allocations: 5.605 MB / 1.093 GB, free: 23.86 MB / 0.8262 GB Notification: Performance of NFScalarize.scalarize: time 0.003415/1.668, allocations: 1.541 MB / 1.095 GB, free: 23.63 MB / 0.8262 GB Notification: Performance of NFVerifyModel.verify: time 0.007833/1.676, allocations: 2.977 MB / 1.098 GB, free: 22.84 MB / 0.8262 GB Notification: Performance of NFConvertDAE.convert: time 0.02089/1.696, allocations: 9.021 MB / 1.107 GB, free: 21.65 MB / 0.8262 GB Notification: Performance of FrontEnd - DAE generated: time 8.165e-06/1.696, allocations: 2.422 kB / 1.107 GB, free: 21.65 MB / 0.8262 GB Notification: Performance of FrontEnd: time 2.104e-06/1.696, allocations: 0 / 1.107 GB, free: 21.65 MB / 0.8262 GB Notification: Performance of Transformations before backend: time 0.0002847/1.697, allocations: 0.9688 kB / 1.107 GB, free: 21.65 MB / 0.8262 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 822 * Number of variables: 822 Notification: Performance of Generate backend data structure: time 0.02123/1.718, allocations: 6.486 MB / 1.113 GB, free: 18.95 MB / 0.8262 GB Notification: Performance of prepare preOptimizeDAE: time 5.286e-05/1.718, allocations: 8.047 kB / 1.113 GB, free: 18.95 MB / 0.8262 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01176/1.73, allocations: 2.037 MB / 1.115 GB, free: 18.64 MB / 0.8262 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.01072/1.741, allocations: 3.916 MB / 1.119 GB, free: 17.8 MB / 0.8262 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0005016/1.741, allocations: 279.8 kB / 1.119 GB, free: 17.79 MB / 0.8262 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.001792/1.743, allocations: 362.1 kB / 1.119 GB, free: 17.79 MB / 0.8262 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.01317/1.756, allocations: 4.747 MB / 1.124 GB, free: 17.5 MB / 0.8262 GB Notification: Performance of preOpt findStateOrder (simulation): time 6.539e-05/1.756, allocations: 2.062 kB / 1.124 GB, free: 17.5 MB / 0.8262 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.000515/1.757, allocations: 131.9 kB / 1.124 GB, free: 17.5 MB / 0.8262 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.0001522/1.757, allocations: 154.7 kB / 1.124 GB, free: 17.49 MB / 0.8262 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01523/1.772, allocations: 5.284 MB / 1.129 GB, free: 17.43 MB / 0.8262 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 0.03938/1.811, allocations: 19.59 MB / 1.148 GB, free: 8.594 MB / 0.8262 GB Notification: Performance of preOpt comSubExp (simulation): time 0.01097/1.822, allocations: 3.552 MB / 1.152 GB, free: 7.816 MB / 0.8262 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.005419/1.828, allocations: 1.863 MB / 1.154 GB, free: 7.438 MB / 0.8262 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001033/1.829, allocations: 0.6874 MB / 1.154 GB, free: 6.742 MB / 0.8262 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.006636/1.835, allocations: 2.248 MB / 1.157 GB, free: 6.055 MB / 0.8262 GB Notification: Performance of pre-optimization done (n=251): time 5.37e-06/1.835, allocations: 0 / 1.157 GB, free: 6.055 MB / 0.8262 GB Notification: Performance of matching and sorting (n=251): time 0.01994/1.855, allocations: 5.682 MB / 1.162 GB, free: 2.57 MB / 0.8262 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001111/1.855, allocations: 103.1 kB / 1.162 GB, free: 2.449 MB / 0.8262 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.007206/1.863, allocations: 3.646 MB / 1.166 GB, free: 15.8 MB / 0.8419 GB Notification: Performance of collectPreVariables (initialization): time 0.001159/1.864, allocations: 94.7 kB / 1.166 GB, free: 15.75 MB / 0.8419 GB Notification: Performance of collectInitialEqns (initialization): time 0.001941/1.866, allocations: 1.857 MB / 1.168 GB, free: 14.78 MB / 0.8419 GB Notification: Performance of collectInitialBindings (initialization): time 0.001527/1.867, allocations: 0.8728 MB / 1.169 GB, free: 14.03 MB / 0.8419 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.001479/1.869, allocations: 0.7073 MB / 1.169 GB, free: 13.56 MB / 0.8419 GB Notification: Performance of setup shared object (initialization): time 0.0001545/1.869, allocations: 305.1 kB / 1.17 GB, free: 13.26 MB / 0.8419 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.005612/1.875, allocations: 1.9 MB / 1.171 GB, free: 11.88 MB / 0.8419 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.007516/1.882, allocations: 2.68 MB / 1.174 GB, free: 9.535 MB / 0.8419 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.01221/1.894, allocations: 4.043 MB / 1.178 GB, free: 6.488 MB / 0.8419 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.393e-05/1.894, allocations: 4 kB / 1.178 GB, free: 6.484 MB / 0.8419 GB Notification: Performance of matching and sorting (n=404) (initialization): time 0.0172/1.912, allocations: 4.998 MB / 1.183 GB, free: 1.984 MB / 0.8419 GB Notification: Performance of prepare postOptimizeDAE: time 7.818e-05/1.912, allocations: 37.45 kB / 1.183 GB, free: 1.945 MB / 0.8419 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.809e-05/1.912, allocations: 12 kB / 1.183 GB, free: 1.934 MB / 0.8419 GB Notification: Performance of postOpt tearingSystem (initialization): time 4.554e-05/1.912, allocations: 28 kB / 1.183 GB, free: 1.906 MB / 0.8419 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.006931/1.919, allocations: 1.168 MB / 1.184 GB, free: 0.7812 MB / 0.8419 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.00433/1.923, allocations: 5.967 MB / 1.19 GB, free: 10.6 MB / 0.8575 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.006393/1.929, allocations: 0.6438 MB / 1.191 GB, free: 9.957 MB / 0.8575 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0009789/1.93, allocations: 159.9 kB / 1.191 GB, free: 9.801 MB / 0.8575 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.008239/1.939, allocations: 2.563 MB / 1.193 GB, free: 7.23 MB / 0.8575 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.007404/1.946, allocations: 2.668 MB / 1.196 GB, free: 4.293 MB / 0.8575 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.01232/1.958, allocations: 4.002 MB / 1.2 GB, free: 152 kB / 0.8575 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 2.055e-05/1.958, allocations: 11.31 kB / 1.2 GB, free: 144 kB / 0.8575 GB Notification: Performance of matching and sorting (n=404) (initialization_lambda0): time 0.01617/1.974, allocations: 4.954 MB / 1.205 GB, free: 11.21 MB / 0.8731 GB Notification: Performance of prepare postOptimizeDAE: time 6.907e-05/1.975, allocations: 41.69 kB / 1.205 GB, free: 11.16 MB / 0.8731 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.577e-05/1.975, allocations: 12 kB / 1.205 GB, free: 11.15 MB / 0.8731 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.113e-05/1.975, allocations: 24 kB / 1.205 GB, free: 11.13 MB / 0.8731 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.005455/1.98, allocations: 1.026 MB / 1.206 GB, free: 10.14 MB / 0.8731 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 6.642e-05/1.98, allocations: 40.98 kB / 1.206 GB, free: 10.11 MB / 0.8731 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.006722/1.987, allocations: 0.5738 MB / 1.206 GB, free: 9.535 MB / 0.8731 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.001045/1.988, allocations: 151.9 kB / 1.206 GB, free: 9.387 MB / 0.8731 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 52 * Number of states: 0 () * Number of discrete variables: 15 (hexCroUnm.flowRegime,hexCroUnm.flowRegime_nominal,hexCroC1Unm.flowRegime_nominal,hexCroC1Mix.flowRegime_nominal,hexCou.flowRegime_nominal,hexPar.flowRegime_nominal,trapezoid.count,$PRE.trapezoid.count,trapezoid.T_start,$PRE.trapezoid.T_start,hexCroC1Unm.flowRegime,hexCroC1Mix.flowRegime,hexCou.flowRegime,hexPar.flowRegime,$whenCondition1) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (403): * Single equations (assignments): 392 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 10 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details (not torn): * Constant Jacobian (size): 0 systems * Linear Jacobian (size,density): 0 systems * Non-linear Jacobian (size): 10 systems {1, 1, 1, 1, 1, 1, 1, 1, 1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.001245/1.989, allocations: 365.4 kB / 1.207 GB, free: 9.059 MB / 0.8731 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001837/1.991, allocations: 461 kB / 1.207 GB, free: 8.605 MB / 0.8731 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01414/2.005, allocations: 4.558 MB / 1.212 GB, free: 4.004 MB / 0.8731 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.066e-05/2.005, allocations: 31.94 kB / 1.212 GB, free: 3.973 MB / 0.8731 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.066e-05/2.005, allocations: 0 / 1.212 GB, free: 3.973 MB / 0.8731 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 3.858e-05/2.005, allocations: 15.94 kB / 1.212 GB, free: 3.957 MB / 0.8731 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.02379/2.029, allocations: 8.967 MB / 1.22 GB, free: 10.92 MB / 0.8887 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.703e-05/2.029, allocations: 8 kB / 1.22 GB, free: 10.91 MB / 0.8887 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.00447/2.033, allocations: 0.8213 MB / 1.221 GB, free: 10.12 MB / 0.8887 GB Notification: Performance of postOpt tearingSystem (simulation): time 3.678e-05/2.033, allocations: 15.94 kB / 1.221 GB, free: 10.11 MB / 0.8887 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0003872/2.034, allocations: 87.92 kB / 1.221 GB, free: 10.02 MB / 0.8887 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.003663/2.038, allocations: 5.931 MB / 1.227 GB, free: 3.875 MB / 0.8887 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 7.124e-06/2.038, allocations: 6.719 kB / 1.227 GB, free: 3.871 MB / 0.8887 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01418/2.052, allocations: 4.517 MB / 1.232 GB, free: 15.2 MB / 0.9044 GB Notification: Performance of postOpt removeConstants (simulation): time 0.00322/2.055, allocations: 0.993 MB / 1.233 GB, free: 14.18 MB / 0.9044 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.001288/2.056, allocations: 55.98 kB / 1.233 GB, free: 14.12 MB / 0.9044 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.004879/2.061, allocations: 379.5 kB / 1.233 GB, free: 13.75 MB / 0.9044 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0007097/2.062, allocations: 202.2 kB / 1.233 GB, free: 13.56 MB / 0.9044 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0004648/2.062, allocations: 127.9 kB / 1.233 GB, free: 13.44 MB / 0.9044 GB Notification: Performance of sorting global known variables: time 0.004867/2.067, allocations: 2.404 MB / 1.236 GB, free: 11.04 MB / 0.9044 GB Notification: Performance of sort global known variables: time 1e-07/2.067, allocations: 0 / 1.236 GB, free: 11.04 MB / 0.9044 GB Notification: Performance of remove unused functions: time 0.009103/2.076, allocations: 2.305 MB / 1.238 GB, free: 8.727 MB / 0.9044 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 20 * Number of states: 0 () * Number of discrete variables: 7 ($whenCondition1,hexPar.flowRegime,hexCou.flowRegime,hexCroC1Mix.flowRegime,hexCroC1Unm.flowRegime,trapezoid.T_start,trapezoid.count) * Number of discrete states: 1 (trapezoid.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (283): * Single equations (assignments): 269 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 2 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 10 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details (not torn): * Constant Jacobian (size): 0 systems * Linear Jacobian (size,density): 0 systems * Non-linear Jacobian (size): 10 systems {1, 1, 1, 1, 1, 1, 1, 1, 1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.002171/2.078, allocations: 0.7163 MB / 1.239 GB, free: 8.094 MB / 0.9044 GB Notification: Performance of simCode: created initialization part: time 0.02374/2.102, allocations: 6.839 MB / 1.245 GB, free: 1.34 MB / 0.9044 GB Notification: Performance of simCode: created event and clocks part: time 1.489e-05/2.102, allocations: 5.828 kB / 1.245 GB, free: 1.34 MB / 0.9044 GB Notification: Performance of simCode: created simulation system equations: time 0.007347/2.11, allocations: 2.13 MB / 1.247 GB, free: 15.27 MB / 0.92 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.01186/2.121, allocations: 1.931 MB / 1.249 GB, free: 13.35 MB / 0.92 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.02229/2.144, allocations: 8.288 MB / 1.257 GB, free: 4.984 MB / 0.92 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002577/2.146, allocations: 2.376 MB / 1.26 GB, free: 2.574 MB / 0.92 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.00262/2.149, allocations: 423.2 kB / 1.26 GB, free: 2.16 MB / 0.92 GB Notification: Performance of SimCode: time 1.984e-06/2.149, allocations: 0 / 1.26 GB, free: 2.16 MB / 0.92 GB Notification: Performance of Templates: time 0.6709/2.82, allocations: 271.1 MB / 1.525 GB, free: 0.5067 GB / 1.092 GB make -j1 -f IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.makefile (rm -f IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.pipe ; mkfifo IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.pipe ; head -c 1048576 < IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.pipe >> ../files/IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.sim & ./IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU -abortSlowSimulation -alarm=480 -lv LOG_STATS > IDEAS_dev_IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU.pipe 2>&1)