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 0.001206/0.001207, allocations: 107 kB / 16.41 MB, free: 6.496 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001314/0.001314, allocations: 193.6 kB / 17.34 MB, free: 5.75 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.272/1.272, allocations: 222.9 MB / 241 MB, free: 15.16 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-master/package.mo): time 0.7614/0.7614, allocations: 135.1 MB / 426.3 MB, free: 4.117 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001191/0.001191, allocations: 58.72 kB / 0.5863 GB, free: 21.81 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1363/0.1375, allocations: 80.93 MB / 0.6653 GB, free: 5.938 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(IDEAS.Fluid.HeatExchangers.Validation.DryCoilEffectivenessNTU): time 0.6732/0.8107, allocations: 355.6 MB / 1.013 GB, free: 11.24 MB / 0.7794 GB Notification: Performance of NFInst.instExpressions: time 0.04483/0.8556, allocations: 31.87 MB / 1.044 GB, free: 11.29 MB / 0.8106 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.006031/0.8616, allocations: 163 kB / 1.044 GB, free: 11.12 MB / 0.8106 GB Notification: Performance of NFTyping.typeComponents: time 0.008254/0.8699, allocations: 2.889 MB / 1.047 GB, free: 8.219 MB / 0.8106 GB Notification: Performance of NFTyping.typeBindings: time 0.02315/0.8931, allocations: 8.153 MB / 1.055 GB, free: 36 kB / 0.8106 GB Notification: Performance of NFTyping.typeClassSections: time 0.4807/1.374, allocations: 4.146 MB / 1.059 GB, free: 9.395 MB / 0.8106 GB Notification: Performance of NFFlatten.flatten: time 0.02274/1.397, allocations: 12.58 MB / 1.071 GB, free: 9.371 MB / 0.8106 GB Notification: Performance of NFFlatten.resolveConnections: time 0.009202/1.406, allocations: 4.594 MB / 1.075 GB, free: 24.89 MB / 0.8262 GB Notification: Performance of NFEvalConstants.evaluate: time 0.01953/1.425, allocations: 7.503 MB / 1.083 GB, free: 24.89 MB / 0.8262 GB Notification: Performance of NFSimplifyModel.simplify: time 0.009275/1.435, allocations: 3.977 MB / 1.087 GB, free: 24.66 MB / 0.8262 GB Notification: Performance of NFPackage.collectConstants: time 0.002586/1.437, allocations: 0.5155 MB / 1.087 GB, free: 24.66 MB / 0.8262 GB Notification: Performance of NFFlatten.collectFunctions: time 0.01356/1.451, allocations: 5.598 MB / 1.093 GB, free: 24.66 MB / 0.8262 GB Notification: Performance of NFScalarize.scalarize: time 0.003054/1.454, allocations: 1.506 MB / 1.094 GB, free: 24.46 MB / 0.8262 GB Notification: Performance of NFVerifyModel.verify: time 0.00745/1.462, allocations: 2.984 MB / 1.097 GB, free: 23.66 MB / 0.8262 GB Notification: Performance of NFConvertDAE.convert: time 0.0179/1.479, allocations: 8.979 MB / 1.106 GB, free: 22.64 MB / 0.8262 GB Notification: Performance of FrontEnd - DAE generated: time 7.554e-06/1.479, allocations: 0 / 1.106 GB, free: 22.64 MB / 0.8262 GB Notification: Performance of FrontEnd: time 3.025e-06/1.479, allocations: 0 / 1.106 GB, free: 22.64 MB / 0.8262 GB Notification: Performance of Transformations before backend: time 0.0003131/1.48, allocations: 4.875 kB / 1.106 GB, free: 22.64 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 0.02083/1.501, allocations: 6.311 MB / 1.112 GB, free: 20.09 MB / 0.8262 GB Notification: Performance of prepare preOptimizeDAE: time 4.511e-05/1.501, allocations: 12.39 kB / 1.112 GB, free: 20.09 MB / 0.8262 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01149/1.512, allocations: 2.011 MB / 1.114 GB, free: 19.8 MB / 0.8262 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.01108/1.523, allocations: 3.871 MB / 1.118 GB, free: 19 MB / 0.8262 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0006613/1.524, allocations: 278.5 kB / 1.118 GB, free: 18.99 MB / 0.8262 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.002004/1.526, allocations: 362.1 kB / 1.118 GB, free: 18.99 MB / 0.8262 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.01225/1.538, allocations: 4.749 MB / 1.123 GB, free: 18.71 MB / 0.8262 GB Notification: Performance of preOpt findStateOrder (simulation): time 5.971e-05/1.538, allocations: 2.062 kB / 1.123 GB, free: 18.71 MB / 0.8262 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0004468/1.539, allocations: 138 kB / 1.123 GB, free: 18.71 MB / 0.8262 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.0001417/1.539, allocations: 150.3 kB / 1.123 GB, free: 18.7 MB / 0.8262 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01382/1.553, allocations: 5.285 MB / 1.128 GB, free: 18.61 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 0.03478/1.588, allocations: 19.56 MB / 1.147 GB, free: 10.11 MB / 0.8262 GB Notification: Performance of preOpt comSubExp (simulation): time 0.009457/1.597, allocations: 3.727 MB / 1.151 GB, free: 9.336 MB / 0.8262 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.004674/1.602, allocations: 1.991 MB / 1.153 GB, free: 8.957 MB / 0.8262 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0009085/1.603, allocations: 0.691 MB / 1.154 GB, free: 8.262 MB / 0.8262 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.005423/1.608, allocations: 2.251 MB / 1.156 GB, free: 7.496 MB / 0.8262 GB Notification: Performance of pre-optimization done (n=251): time 4.618e-06/1.608, allocations: 3.188 kB / 1.156 GB, free: 7.496 MB / 0.8262 GB Notification: Performance of matching and sorting (n=251): time 0.01636/1.625, allocations: 5.655 MB / 1.161 GB, free: 3.188 MB / 0.8262 GB Notification: Performance of inlineWhenForInitialization (initialization): time 9.312e-05/1.625, allocations: 103.9 kB / 1.162 GB, free: 3.066 MB / 0.8262 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.005515/1.63, allocations: 3.641 MB / 1.165 GB, free: 432 kB / 0.8262 GB Notification: Performance of collectPreVariables (initialization): time 0.0008535/1.631, allocations: 91.39 kB / 1.165 GB, free: 380 kB / 0.8262 GB Notification: Performance of collectInitialEqns (initialization): time 0.001768/1.633, allocations: 1.836 MB / 1.167 GB, free: 15.43 MB / 0.8419 GB Notification: Performance of collectInitialBindings (initialization): time 0.001196/1.634, allocations: 0.8341 MB / 1.168 GB, free: 14.71 MB / 0.8419 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.001213/1.635, allocations: 0.7053 MB / 1.168 GB, free: 14.25 MB / 0.8419 GB Notification: Performance of setup shared object (initialization): time 0.000109/1.636, allocations: 305.1 kB / 1.169 GB, free: 13.95 MB / 0.8419 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.005279/1.641, allocations: 1.899 MB / 1.171 GB, free: 12.57 MB / 0.8419 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.006311/1.647, allocations: 2.679 MB / 1.173 GB, free: 10.23 MB / 0.8419 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.01083/1.658, allocations: 4.043 MB / 1.177 GB, free: 7.18 MB / 0.8419 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.848e-05/1.658, allocations: 8 kB / 1.177 GB, free: 7.172 MB / 0.8419 GB Notification: Performance of matching and sorting (n=404) (initialization): time 0.01616/1.674, allocations: 4.974 MB / 1.182 GB, free: 3.004 MB / 0.8419 GB Notification: Performance of prepare postOptimizeDAE: time 7.202e-05/1.674, allocations: 37.64 kB / 1.182 GB, free: 2.961 MB / 0.8419 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 3.227e-05/1.674, allocations: 12 kB / 1.182 GB, free: 2.949 MB / 0.8419 GB Notification: Performance of postOpt tearingSystem (initialization): time 5.598e-05/1.674, allocations: 28 kB / 1.182 GB, free: 2.922 MB / 0.8419 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.006715/1.681, allocations: 1.169 MB / 1.183 GB, free: 1.793 MB / 0.8419 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003518/1.685, allocations: 5.967 MB / 1.189 GB, free: 11.62 MB / 0.8575 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.005748/1.69, allocations: 0.6393 MB / 1.19 GB, free: 10.98 MB / 0.8575 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0008307/1.691, allocations: 159.9 kB / 1.19 GB, free: 10.82 MB / 0.8575 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.008091/1.699, allocations: 2.556 MB / 1.192 GB, free: 8.262 MB / 0.8575 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.006752/1.706, allocations: 2.672 MB / 1.195 GB, free: 5.316 MB / 0.8575 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0114/1.718, allocations: 4.004 MB / 1.199 GB, free: 1.172 MB / 0.8575 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 2.026e-05/1.718, allocations: 4 kB / 1.199 GB, free: 1.168 MB / 0.8575 GB Notification: Performance of matching and sorting (n=404) (initialization_lambda0): time 0.01537/1.733, allocations: 4.933 MB / 1.204 GB, free: 12.26 MB / 0.8731 GB Notification: Performance of prepare postOptimizeDAE: time 5.337e-05/1.733, allocations: 44.66 kB / 1.204 GB, free: 12.21 MB / 0.8731 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.263e-05/1.733, allocations: 12 kB / 1.204 GB, free: 12.2 MB / 0.8731 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.737e-05/1.733, allocations: 24 kB / 1.204 GB, free: 12.18 MB / 0.8731 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.005116/1.738, allocations: 1.029 MB / 1.205 GB, free: 11.19 MB / 0.8731 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 7.252e-05/1.738, allocations: 42.67 kB / 1.205 GB, free: 11.15 MB / 0.8731 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.00567/1.744, allocations: 0.5629 MB / 1.205 GB, free: 10.59 MB / 0.8731 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0006993/1.745, allocations: 151.9 kB / 1.206 GB, free: 10.44 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 0.001367/1.746, allocations: 369.6 kB / 1.206 GB, free: 10.11 MB / 0.8731 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001857/1.748, allocations: 442.5 kB / 1.206 GB, free: 9.676 MB / 0.8731 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01367/1.762, allocations: 4.567 MB / 1.211 GB, free: 5.062 MB / 0.8731 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 3.589e-05/1.762, allocations: 31.94 kB / 1.211 GB, free: 5.031 MB / 0.8731 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.312e-05/1.762, allocations: 0 / 1.211 GB, free: 5.031 MB / 0.8731 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 4.399e-05/1.762, allocations: 15.94 kB / 1.211 GB, free: 5.016 MB / 0.8731 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.02274/1.785, allocations: 8.954 MB / 1.22 GB, free: 11.99 MB / 0.8887 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.702e-05/1.785, allocations: 4 kB / 1.22 GB, free: 11.98 MB / 0.8887 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.004241/1.789, allocations: 0.8188 MB / 1.22 GB, free: 11.2 MB / 0.8887 GB Notification: Performance of postOpt tearingSystem (simulation): time 3.94e-05/1.789, allocations: 12 kB / 1.22 GB, free: 11.18 MB / 0.8887 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0004105/1.789, allocations: 87.86 kB / 1.22 GB, free: 11.1 MB / 0.8887 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002875/1.792, allocations: 5.931 MB / 1.226 GB, free: 4.953 MB / 0.8887 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 9.819e-06/1.792, allocations: 18.11 kB / 1.226 GB, free: 4.941 MB / 0.8887 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01317/1.806, allocations: 4.483 MB / 1.231 GB, free: 304 kB / 0.8887 GB Notification: Performance of postOpt removeConstants (simulation): time 0.003085/1.809, allocations: 0.9689 MB / 1.232 GB, free: 15.3 MB / 0.9044 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.001322/1.81, allocations: 55.98 kB / 1.232 GB, free: 15.25 MB / 0.9044 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.004739/1.815, allocations: 371.6 kB / 1.232 GB, free: 14.89 MB / 0.9044 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0005459/1.815, allocations: 208.2 kB / 1.232 GB, free: 14.68 MB / 0.9044 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0005114/1.816, allocations: 130.4 kB / 1.232 GB, free: 14.56 MB / 0.9044 GB Notification: Performance of sorting global known variables: time 0.005181/1.821, allocations: 2.4 MB / 1.235 GB, free: 12.16 MB / 0.9044 GB Notification: Performance of sort global known variables: time 2.6e-07/1.821, allocations: 3.938 kB / 1.235 GB, free: 12.16 MB / 0.9044 GB Notification: Performance of remove unused functions: time 0.00879/1.83, allocations: 2.293 MB / 1.237 GB, free: 9.859 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 0.002278/1.832, allocations: 0.7081 MB / 1.238 GB, free: 9.227 MB / 0.9044 GB Notification: Performance of simCode: created initialization part: time 0.02191/1.854, allocations: 7.178 MB / 1.245 GB, free: 2.129 MB / 0.9044 GB Notification: Performance of simCode: created event and clocks part: time 1.339e-05/1.854, allocations: 3.391 kB / 1.245 GB, free: 2.129 MB / 0.9044 GB Notification: Performance of simCode: created simulation system equations: time 0.006629/1.861, allocations: 2.254 MB / 1.247 GB, free: 15.93 MB / 0.92 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0118/1.873, allocations: 1.937 MB / 1.249 GB, free: 14.02 MB / 0.92 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01934/1.892, allocations: 8.128 MB / 1.257 GB, free: 5.809 MB / 0.92 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002857/1.895, allocations: 2.387 MB / 1.259 GB, free: 3.387 MB / 0.92 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.002579/1.897, allocations: 415.2 kB / 1.259 GB, free: 2.98 MB / 0.92 GB Notification: Performance of SimCode: time 9.92e-07/1.897, allocations: 0 / 1.259 GB, free: 2.98 MB / 0.92 GB Notification: Performance of Templates: time 0.5649/2.462, allocations: 271.3 MB / 1.524 GB, free: 0.5072 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)