Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.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/Buildings 11.0.0-master/package.mo", uses=false) Using package Buildings with version 11.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.0.0-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: "" <> buildModelFMU(Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl,fileNamePrefix="Buildings_latest_Buildings_Fluid_HeatExchangers_Examples_PlateHeatExchangerEffectivenessNTUPControl",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl,fileNamePrefix="Buildings_latest_Buildings_Fluid_HeatExchangers_Examples_PlateHeatExchangerEffectivenessNTUPControl",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0008397/0.0008397, allocations: 97.64 kB / 15.36 MB, free: 0.7344 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.004962/0.004962, allocations: 172.2 kB / 16.27 MB, free: 6.652 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.229/1.229, allocations: 223.3 MB / 240.3 MB, free: 5.332 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.0.0-master/package.mo): time 2.495/2.495, allocations: 462.6 MB / 0.7364 GB, free: 15.55 MB / 0.5919 GB Notification: Performance of FrontEnd - loaded program: time 0.0003031/0.0003032, allocations: 9.906 kB / 0.9029 GB, free: 36.35 MB / 0.7169 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2578/0.2581, allocations: 159.6 MB / 1.059 GB, free: 4.867 MB / 0.8106 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl): time 0.043/0.3012, allocations: 46.97 MB / 1.105 GB, free: 5.738 MB / 0.8575 GB Notification: Performance of NFInst.instExpressions: time 0.01472/0.3159, allocations: 11.93 MB / 1.116 GB, free: 9.785 MB / 0.8731 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00152/0.3175, allocations: 51.62 kB / 1.116 GB, free: 9.734 MB / 0.8731 GB Notification: Performance of NFTyping.typeComponents: time 0.001541/0.319, allocations: 0.5786 MB / 1.117 GB, free: 9.152 MB / 0.8731 GB Notification: Performance of NFTyping.typeBindings: time 0.004338/0.3234, allocations: 1.843 MB / 1.119 GB, free: 7.301 MB / 0.8731 GB Notification: Performance of NFTyping.typeClassSections: time 0.003985/0.3274, allocations: 1.82 MB / 1.12 GB, free: 5.504 MB / 0.8731 GB Notification: Performance of NFFlatten.flatten: time 0.004278/0.3316, allocations: 4.263 MB / 1.125 GB, free: 1.23 MB / 0.8731 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001449/0.3331, allocations: 1.031 MB / 1.126 GB, free: 172 kB / 0.8731 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002325/0.3354, allocations: 1.326 MB / 1.127 GB, free: 14.84 MB / 0.8887 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001347/0.3368, allocations: 0.9757 MB / 1.128 GB, free: 13.86 MB / 0.8887 GB Notification: Performance of NFPackage.collectConstants: time 0.00016/0.337, allocations: 56 kB / 1.128 GB, free: 13.8 MB / 0.8887 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003154/0.3401, allocations: 2.157 MB / 1.13 GB, free: 11.64 MB / 0.8887 GB Notification: Performance of NFScalarize.scalarize: time 0.0002561/0.3404, allocations: 278.5 kB / 1.13 GB, free: 11.37 MB / 0.8887 GB Notification: Performance of NFVerifyModel.verify: time 0.000644/0.341, allocations: 0.7475 MB / 1.131 GB, free: 10.61 MB / 0.8887 GB Notification: Performance of NFConvertDAE.convert: time 0.002656/0.3437, allocations: 2.777 MB / 1.134 GB, free: 7.824 MB / 0.8887 GB Notification: Performance of FrontEnd - DAE generated: time 4.038e-06/0.3437, allocations: 4 kB / 1.134 GB, free: 7.82 MB / 0.8887 GB Notification: Performance of FrontEnd: time 1.243e-06/0.3437, allocations: 0 / 1.134 GB, free: 7.82 MB / 0.8887 GB Notification: Performance of Transformations before backend: time 1.291e-05/0.3438, allocations: 0 / 1.134 GB, free: 7.82 MB / 0.8887 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 214 * Number of variables: 214 Notification: Performance of Generate backend data structure: time 0.003077/0.3468, allocations: 1.847 MB / 1.136 GB, free: 5.91 MB / 0.8887 GB Notification: Performance of prepare preOptimizeDAE: time 3.27e-05/0.3469, allocations: 8.031 kB / 1.136 GB, free: 5.902 MB / 0.8887 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0001494/0.347, allocations: 135.4 kB / 1.136 GB, free: 5.762 MB / 0.8887 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001824/0.3489, allocations: 429.9 kB / 1.136 GB, free: 5.34 MB / 0.8887 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.00226/0.3511, allocations: 1.366 MB / 1.137 GB, free: 3.922 MB / 0.8887 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0006427/0.3518, allocations: 206.2 kB / 1.138 GB, free: 3.719 MB / 0.8887 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001524/0.3519, allocations: 107.9 kB / 1.138 GB, free: 3.613 MB / 0.8887 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00203/0.354, allocations: 1.112 MB / 1.139 GB, free: 2.469 MB / 0.8887 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.786e-05/0.354, allocations: 0 / 1.139 GB, free: 2.469 MB / 0.8887 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.473e-05/0.3541, allocations: 39.94 kB / 1.139 GB, free: 2.43 MB / 0.8887 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.43e-05/0.3541, allocations: 38 kB / 1.139 GB, free: 2.391 MB / 0.8887 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002423/0.3566, allocations: 1.062 MB / 1.14 GB, free: 1.328 MB / 0.8887 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 0.006271/0.3629, allocations: 4.738 MB / 1.145 GB, free: 12.32 MB / 0.9044 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002031/0.3649, allocations: 0.842 MB / 1.145 GB, free: 11.46 MB / 0.9044 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001042/0.366, allocations: 467.1 kB / 1.146 GB, free: 11 MB / 0.9044 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001091/0.3671, allocations: 1.084 MB / 1.147 GB, free: 9.699 MB / 0.9044 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001214/0.3683, allocations: 0.5391 MB / 1.147 GB, free: 9.148 MB / 0.9044 GB Notification: Performance of pre-optimization done (n=72): time 2.324e-06/0.3683, allocations: 0 / 1.147 GB, free: 9.148 MB / 0.9044 GB Notification: Performance of matching and sorting (n=72): time 0.00337/0.3717, allocations: 1.39 MB / 1.149 GB, free: 7.754 MB / 0.9044 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.87e-05/0.3717, allocations: 64.06 kB / 1.149 GB, free: 7.68 MB / 0.9044 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001324/0.373, allocations: 1.187 MB / 1.15 GB, free: 6.48 MB / 0.9044 GB Notification: Performance of collectPreVariables (initialization): time 8.31e-05/0.3731, allocations: 53.7 kB / 1.15 GB, free: 6.422 MB / 0.9044 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004383/0.3736, allocations: 0.6029 MB / 1.151 GB, free: 5.812 MB / 0.9044 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001762/0.3738, allocations: 240.5 kB / 1.151 GB, free: 5.574 MB / 0.9044 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001151/0.3739, allocations: 85.67 kB / 1.151 GB, free: 5.484 MB / 0.9044 GB Notification: Performance of setup shared object (initialization): time 0.0001093/0.374, allocations: 341.9 kB / 1.151 GB, free: 5.145 MB / 0.9044 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001106/0.3751, allocations: 453.7 kB / 1.152 GB, free: 4.699 MB / 0.9044 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001267/0.3764, allocations: 0.6641 MB / 1.152 GB, free: 3.957 MB / 0.9044 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.002188/0.3786, allocations: 1.027 MB / 1.153 GB, free: 2.867 MB / 0.9044 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.628e-06/0.3786, allocations: 4 kB / 1.153 GB, free: 2.863 MB / 0.9044 GB Notification: Performance of matching and sorting (n=118) (initialization): time 0.002745/0.3813, allocations: 1.31 MB / 1.155 GB, free: 1.543 MB / 0.9044 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001356/0.3815, allocations: 242.7 kB / 1.155 GB, free: 1.238 MB / 0.9044 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.265e-06/0.3815, allocations: 8 kB / 1.155 GB, free: 1.23 MB / 0.9044 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.538e-05/0.3815, allocations: 8 kB / 1.155 GB, free: 1.223 MB / 0.9044 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001396/0.3829, allocations: 311.6 kB / 1.155 GB, free: 0.918 MB / 0.9044 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.000596/0.3835, allocations: 1.195 MB / 1.156 GB, free: 15.68 MB / 0.92 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.00121/0.3848, allocations: 199 kB / 1.157 GB, free: 15.48 MB / 0.92 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.207e-05/0.3849, allocations: 51.97 kB / 1.157 GB, free: 15.43 MB / 0.92 GB Notification: Performance of prepare postOptimizeDAE: time 7.284e-06/0.3849, allocations: 8 kB / 1.157 GB, free: 15.42 MB / 0.92 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.002553/0.3874, allocations: 1.157 MB / 1.158 GB, free: 14.26 MB / 0.92 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.791e-06/0.3875, allocations: 8 kB / 1.158 GB, free: 14.25 MB / 0.92 GB Notification: Performance of postOpt tearingSystem (initialization): time 7.785e-06/0.3875, allocations: 8 kB / 1.158 GB, free: 14.25 MB / 0.92 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001081/0.3886, allocations: 279.7 kB / 1.158 GB, free: 13.97 MB / 0.92 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 9.989e-06/0.3886, allocations: 11.94 kB / 1.158 GB, free: 13.96 MB / 0.92 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001136/0.3897, allocations: 193.8 kB / 1.158 GB, free: 13.77 MB / 0.92 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.154e-05/0.3898, allocations: 51.97 kB / 1.158 GB, free: 13.72 MB / 0.92 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 18 * Number of states: 0 () * Number of discrete variables: 8 (hex.flowRegime_nominal,hex.flowRegime,TSet.count,$PRE.TSet.count,TSet.T_start,$PRE.TSet.T_start,$whenCondition1,P.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (117): * Single equations (assignments): 114 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 2 * 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): 2 systems {1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.0004261/0.3902, allocations: 366.3 kB / 1.159 GB, free: 13.36 MB / 0.92 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001865/0.3904, allocations: 146.2 kB / 1.159 GB, free: 13.21 MB / 0.92 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.002854/0.3933, allocations: 1.319 MB / 1.16 GB, free: 11.89 MB / 0.92 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.388e-05/0.3933, allocations: 11.98 kB / 1.16 GB, free: 11.88 MB / 0.92 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 5.63e-06/0.3933, allocations: 3.938 kB / 1.16 GB, free: 11.88 MB / 0.92 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 9.468e-06/0.3933, allocations: 3.984 kB / 1.16 GB, free: 11.88 MB / 0.92 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004071/0.3974, allocations: 2.545 MB / 1.163 GB, free: 9.242 MB / 0.92 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.127e-06/0.3974, allocations: 0 / 1.163 GB, free: 9.242 MB / 0.92 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0009596/0.3984, allocations: 224 kB / 1.163 GB, free: 9.023 MB / 0.92 GB Notification: Performance of postOpt tearingSystem (simulation): time 6.041e-06/0.3984, allocations: 4 kB / 1.163 GB, free: 9.02 MB / 0.92 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.961e-05/0.3985, allocations: 35.97 kB / 1.163 GB, free: 8.984 MB / 0.92 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.000488/0.399, allocations: 1.18 MB / 1.164 GB, free: 7.758 MB / 0.92 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.186e-06/0.399, allocations: 4 kB / 1.164 GB, free: 7.754 MB / 0.92 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003687/0.4027, allocations: 1.895 MB / 1.166 GB, free: 5.812 MB / 0.92 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004152/0.4031, allocations: 366.9 kB / 1.166 GB, free: 5.434 MB / 0.92 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001443/0.4033, allocations: 20 kB / 1.166 GB, free: 5.414 MB / 0.92 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001116/0.4044, allocations: 152.3 kB / 1.166 GB, free: 5.266 MB / 0.92 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001159/0.4045, allocations: 68.5 kB / 1.166 GB, free: 5.199 MB / 0.92 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 7.056e-05/0.4046, allocations: 39.98 kB / 1.166 GB, free: 5.16 MB / 0.92 GB Notification: Performance of sorting global known variables: time 0.0009578/0.4056, allocations: 0.7972 MB / 1.167 GB, free: 4.363 MB / 0.92 GB Notification: Performance of sort global known variables: time 1.6e-07/0.4056, allocations: 0 / 1.167 GB, free: 4.363 MB / 0.92 GB Notification: Performance of remove unused functions: time 0.001544/0.4071, allocations: 0.7528 MB / 1.168 GB, free: 3.609 MB / 0.92 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 9 * Number of states: 4 (temSen.T,val.filter.s[1],val.filter.s[2],P.I.y) * 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 (89): * Single equations (assignments): 79 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 6 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 2 * 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): 2 systems {1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.004762/0.4119, allocations: 2.862 MB / 1.171 GB, free: 0.7109 MB / 0.92 GB Notification: Performance of simCode: created initialization part: time 0.004058/0.416, allocations: 1.867 MB / 1.173 GB, free: 14.82 MB / 0.9356 GB Notification: Performance of simCode: created event and clocks part: time 2.855e-06/0.416, allocations: 0 / 1.173 GB, free: 14.82 MB / 0.9356 GB Notification: Performance of simCode: created simulation system equations: time 0.001288/0.4173, allocations: 0.5906 MB / 1.173 GB, free: 14.23 MB / 0.9356 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00303/0.4203, allocations: 0.5927 MB / 1.174 GB, free: 13.65 MB / 0.9356 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01774/0.4381, allocations: 11.31 MB / 1.185 GB, free: 1.836 MB / 0.9356 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006114/0.4387, allocations: 1.176 MB / 1.186 GB, free: 0.6328 MB / 0.9356 GB Notification: Performance of simCode: alias equations: time 0.001303/0.44, allocations: 364.6 kB / 1.186 GB, free: 312 kB / 0.9356 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0006731/0.4407, allocations: 0.5384 MB / 1.187 GB, free: 15.76 MB / 0.9512 GB Notification: Performance of SimCode: time 8.52e-07/0.4407, allocations: 8 kB / 1.187 GB, free: 15.75 MB / 0.9512 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 1.349/1.79, allocations: 38.25 MB / 1.224 GB, free: 10.13 MB / 0.9825 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002541/1.79, allocations: 321.7 kB / 1.224 GB, free: 9.746 MB / 0.9825 GB Notification: Performance of buildModelFMU: Generate platform static: time 2.867/4.657, allocations: 0 / 1.224 GB, free: 9.746 MB / 0.9825 GB (rm -f Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.pipe ; mkfifo Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.pipe ; head -c 1048576 < Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.pipe >> ../files/Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl_res.mat --tempDir=temp_Buildings_latest_Buildings_Fluid_HeatExchangers_Examples_PlateHeatExchangerEffectivenessNTUPControl_fmu --startTime=0 --stopTime=3600 --timeout=50 --tolerance=1e-06 Buildings_latest_Buildings_Fluid_HeatExchangers_Examples_PlateHeatExchangerEffectivenessNTUPControl.fmu > Buildings_latest_Buildings.Fluid.HeatExchangers.Examples.PlateHeatExchangerEffectivenessNTUPControl.pipe 2>&1)