Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.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 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo", uses=false) Using package Buildings with version 8.1.4 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/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 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.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic,fileNamePrefix="Buildings_8_Buildings_HeatTransfer_Windows_BaseClasses_Examples_AbsorbedRadiationElectrochromic",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic,fileNamePrefix="Buildings_8_Buildings_HeatTransfer_Windows_BaseClasses_Examples_AbsorbedRadiationElectrochromic",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 0.001525/0.001532, allocations: 109.4 kB / 15.69 MB, free: 128 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001851/0.001851, allocations: 186.7 kB / 16.62 MB, free: 6.613 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.576/1.576, allocations: 205.1 MB / 222.5 MB, free: 4.543 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo): time 1.829/1.829, allocations: 292.3 MB / 0.549 GB, free: 12.77 MB / 462.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.002308/0.002308, allocations: 72.25 kB / 0.6718 GB, free: 26.12 MB / 0.5294 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2973/0.2996, allocations: 114.5 MB / 0.7836 GB, free: 13.27 MB / 0.6075 GB Notification: Performance of NFInst.instantiate(Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic): time 0.008644/0.3083, allocations: 5.767 MB / 0.7893 GB, free: 7.461 MB / 0.6075 GB Notification: Performance of NFInst.instExpressions: time 0.7396/1.048, allocations: 155 MB / 0.9406 GB, free: 2.785 MB / 0.7169 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00118/1.049, allocations: 25 kB / 0.9406 GB, free: 2.777 MB / 0.7169 GB Notification: Performance of NFTyping.typeComponents: time 0.004969/1.054, allocations: 1.744 MB / 0.9423 GB, free: 2.465 MB / 0.7169 GB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Utilities/Strings.mo:216:3-259:11:writable] Warning: Pure function 'Modelica.Utilities.Strings.find' contains a call to impure function 'Modelica.Utilities.Strings.length'. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/BoundaryConditions/WeatherData/BaseClasses/getHeaderElementTMY3.mo:2:1-105:25:writable] Warning: Pure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3' contains a call to impure function 'Modelica.Utilities.Streams.readLine'. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/BoundaryConditions/WeatherData/BaseClasses/getLongitudeTMY3.mo:2:1-48:21:writable] Warning: Pure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getLongitudeTMY3' contains a call to impure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3'. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/BoundaryConditions/WeatherData/BaseClasses/getLatitudeTMY3.mo:2:1-48:20:writable] Warning: Pure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getLatitudeTMY3' contains a call to impure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3'. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/BoundaryConditions/WeatherData/BaseClasses/getTimeZoneTMY3.mo:2:1-47:20:writable] Warning: Pure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getTimeZoneTMY3' contains a call to impure function 'Buildings.BoundaryConditions.WeatherData.BaseClasses.getHeaderElementTMY3'. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Utilities/Strings.mo:139:3-175:14:writable] Warning: Pure function 'Modelica.Utilities.Strings.isEmpty' contains a call to impure function 'Modelica.Utilities.Strings.Advanced.skipWhiteSpace'. Notification: Performance of NFTyping.typeBindings: time 0.002241/1.056, allocations: 0.6498 MB / 0.943 GB, free: 2.289 MB / 0.7169 GB Notification: Performance of NFTyping.typeClassSections: time 0.002438/1.059, allocations: 0.9472 MB / 0.9439 GB, free: 2.207 MB / 0.7169 GB Notification: Performance of NFFlatten.flatten: time 0.004724/1.064, allocations: 3.194 MB / 0.947 GB, free: 1.957 MB / 0.7169 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001792/1.065, allocations: 0.9162 MB / 0.9479 GB, free: 1.766 MB / 0.7169 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002479/1.068, allocations: 1.072 MB / 0.949 GB, free: 1.746 MB / 0.7169 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002371/1.07, allocations: 0.938 MB / 0.9499 GB, free: 1.73 MB / 0.7169 GB Notification: Performance of NFPackage.collectConstants: time 0.0004585/1.071, allocations: 176.7 kB / 0.95 GB, free: 1.73 MB / 0.7169 GB Notification: Performance of NFFlatten.collectFunctions: time 0.004725/1.076, allocations: 2.137 MB / 0.9521 GB, free: 1.66 MB / 0.7169 GB Notification: Performance of NFScalarize.scalarize: time 0.002012/1.078, allocations: 2.011 MB / 0.9541 GB, free: 1.555 MB / 0.7169 GB Notification: Performance of NFVerifyModel.verify: time 0.003471/1.081, allocations: 2.041 MB / 0.9561 GB, free: 0.9492 MB / 0.7169 GB Notification: Performance of NFConvertDAE.convert: time 0.01138/1.093, allocations: 7.626 MB / 0.9635 GB, free: 0 / 0.7169 GB Notification: Performance of FrontEnd - DAE generated: time 6.091e-06/1.093, allocations: 192 / 0.9635 GB, free: 0 / 0.7169 GB Notification: Performance of FrontEnd: time 4.218e-06/1.093, allocations: 5.375 kB / 0.9635 GB, free: 15.99 MB / 0.7325 GB Notification: Performance of Transformations before backend: time 0.0001922/1.093, allocations: 4 kB / 0.9635 GB, free: 15.99 MB / 0.7325 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 309 * Number of variables: 309 Notification: Performance of Generate backend data structure: time 0.01889/1.112, allocations: 6.052 MB / 0.9695 GB, free: 12.84 MB / 0.7325 GB Notification: Performance of prepare preOptimizeDAE: time 4.818e-05/1.112, allocations: 10.16 kB / 0.9695 GB, free: 12.84 MB / 0.7325 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0003589/1.112, allocations: 178.2 kB / 0.9696 GB, free: 12.77 MB / 0.7325 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003156/1.115, allocations: 459.2 kB / 0.9701 GB, free: 12.53 MB / 0.7325 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.8506/1.966, allocations: 321.1 MB / 1.284 GB, free: 296.7 MB / 1.014 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0002462/1.966, allocations: 124.5 kB / 1.284 GB, free: 296.7 MB / 1.014 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0008116/1.967, allocations: 169.1 kB / 1.284 GB, free: 296.7 MB / 1.014 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003043/1.97, allocations: 1.558 MB / 1.285 GB, free: 296.5 MB / 1.014 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.603e-05/1.97, allocations: 0.75 kB / 1.285 GB, free: 296.5 MB / 1.014 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001126/1.97, allocations: 48.53 kB / 1.285 GB, free: 296.5 MB / 1.014 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.373e-05/1.97, allocations: 28.22 kB / 1.285 GB, free: 296.5 MB / 1.014 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.00286/1.973, allocations: 1.64 MB / 1.287 GB, free: 296.5 MB / 1.014 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.05769/2.031, allocations: 76.23 MB / 1.362 GB, free: 251.4 MB / 1.014 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001945/2.033, allocations: 1.463 MB / 1.363 GB, free: 250 MB / 1.014 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0008574/2.034, allocations: 0.9971 MB / 1.364 GB, free: 249 MB / 1.014 GB Notification: Performance of preOpt evalFunc (simulation): time 8.037e-05/2.034, allocations: 33.83 kB / 1.364 GB, free: 248.9 MB / 1.014 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001041/2.035, allocations: 0.8873 MB / 1.365 GB, free: 248 MB / 1.014 GB Notification: Performance of pre-optimization done (n=106): time 3.647e-06/2.035, allocations: 0 / 1.365 GB, free: 248 MB / 1.014 GB Notification: Performance of matching and sorting (n=106): time 0.006496/2.042, allocations: 2.835 MB / 1.368 GB, free: 245.2 MB / 1.014 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.000154/2.042, allocations: 343 kB / 1.368 GB, free: 244.8 MB / 1.014 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 1.006/3.048, allocations: 379.6 MB / 1.739 GB, free: 332.2 MB / 1.076 GB Notification: Performance of collectPreVariables (initialization): time 0.0005453/3.048, allocations: 70.73 kB / 1.739 GB, free: 332.2 MB / 1.076 GB Notification: Performance of collectInitialEqns (initialization): time 0.002588/3.051, allocations: 1.572 MB / 1.74 GB, free: 330.9 MB / 1.076 GB Notification: Performance of collectInitialBindings (initialization): time 0.0005075/3.052, allocations: 349.9 kB / 1.741 GB, free: 330.7 MB / 1.076 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.001318/3.053, allocations: 0.4968 MB / 1.741 GB, free: 330.2 MB / 1.076 GB Notification: Performance of setup shared object (initialization): time 4.865e-05/3.053, allocations: 305.8 kB / 1.741 GB, free: 329.9 MB / 1.076 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001686/3.055, allocations: 1.395 MB / 1.743 GB, free: 328.7 MB / 1.076 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001929/3.057, allocations: 2.119 MB / 1.745 GB, free: 326.3 MB / 1.076 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.003523/3.06, allocations: 3.468 MB / 1.748 GB, free: 322.7 MB / 1.076 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.445e-05/3.06, allocations: 8 kB / 1.748 GB, free: 322.7 MB / 1.076 GB Notification: Performance of matching and sorting (n=278) (initialization): time 0.008735/3.069, allocations: 4.144 MB / 1.752 GB, free: 318.7 MB / 1.076 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001815/3.069, allocations: 190.3 kB / 1.752 GB, free: 318.5 MB / 1.076 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.232e-05/3.069, allocations: 20 kB / 1.752 GB, free: 318.5 MB / 1.076 GB Notification: Performance of postOpt tearingSystem (initialization): time 5.094e-05/3.069, allocations: 32.97 kB / 1.752 GB, free: 318.4 MB / 1.076 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001645/3.071, allocations: 456.9 kB / 1.753 GB, free: 318 MB / 1.076 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 5.474e-05/3.071, allocations: 47.05 kB / 1.753 GB, free: 318 MB / 1.076 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.004792/3.076, allocations: 0.5258 MB / 1.753 GB, free: 317.5 MB / 1.076 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000568/3.076, allocations: 108 kB / 1.754 GB, free: 317.4 MB / 1.076 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 96 * Number of states: 0 () * Number of discrete variables: 6 (weaDat.conTim.tNext,$PRE.weaDat.conTim.tNext,weaDat.conTimMin.tNext,$PRE.weaDat.conTimMin.tNext,$whenCondition1,$whenCondition2) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (249): * Single equations (assignments): 248 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.004009/3.08, allocations: 1.65 MB / 1.755 GB, free: 315.7 MB / 1.076 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.003245/3.084, allocations: 339.4 kB / 1.755 GB, free: 315.4 MB / 1.076 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.005114/3.089, allocations: 2.815 MB / 1.758 GB, free: 312.6 MB / 1.076 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.398e-05/3.089, allocations: 10.97 kB / 1.758 GB, free: 312.6 MB / 1.076 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 9.298e-06/3.089, allocations: 0 / 1.758 GB, free: 312.6 MB / 1.076 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.428e-05/3.089, allocations: 13.42 kB / 1.758 GB, free: 312.6 MB / 1.076 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0122/3.101, allocations: 6.089 MB / 1.764 GB, free: 306.4 MB / 1.076 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 8.616e-06/3.101, allocations: 4 kB / 1.764 GB, free: 306.4 MB / 1.076 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0005846/3.102, allocations: 152.8 kB / 1.764 GB, free: 306.3 MB / 1.076 GB Notification: Performance of postOpt tearingSystem (simulation): time 8.035e-06/3.102, allocations: 0 / 1.764 GB, free: 306.3 MB / 1.076 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 6.907e-05/3.102, allocations: 32.89 kB / 1.764 GB, free: 306.2 MB / 1.076 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 7.254e-06/3.102, allocations: 4 kB / 1.764 GB, free: 306.2 MB / 1.076 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.047e-06/3.102, allocations: 3.938 kB / 1.764 GB, free: 306.2 MB / 1.076 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005569/3.108, allocations: 2.742 MB / 1.767 GB, free: 303.5 MB / 1.076 GB Notification: Performance of postOpt removeConstants (simulation): time 0.003536/3.111, allocations: 1.211 MB / 1.768 GB, free: 302.2 MB / 1.076 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.001945/3.113, allocations: 24.8 kB / 1.768 GB, free: 302.2 MB / 1.076 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002786/3.116, allocations: 285.9 kB / 1.769 GB, free: 301.9 MB / 1.076 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002229/3.116, allocations: 76.42 kB / 1.769 GB, free: 301.9 MB / 1.076 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001007/3.116, allocations: 47.28 kB / 1.769 GB, free: 301.8 MB / 1.076 GB Notification: Performance of sorting global known variables: time 0.7853/3.902, allocations: 305.3 MB / 2.067 GB, free: 358.9 MB / 1.076 GB Notification: Performance of sort global known variables: time 1.462e-06/3.902, allocations: 1.031 kB / 2.067 GB, free: 358.9 MB / 1.076 GB Notification: Performance of remove unused functions: time 0.009657/3.911, allocations: 1.172 MB / 2.068 GB, free: 358.9 MB / 1.076 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 0 () * Number of discrete variables: 4 ($whenCondition2,$whenCondition1,weaDat.conTimMin.tNext,weaDat.conTim.tNext) * Number of discrete states: 2 (weaDat.conTim.tNext,weaDat.conTimMin.tNext) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (90): * Single equations (assignments): 87 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.01523/3.927, allocations: 4.106 MB / 2.072 GB, free: 358.1 MB / 1.076 GB Notification: Performance of simCode: created initialization part: time 0.007793/3.934, allocations: 4.504 MB / 2.076 GB, free: 358 MB / 1.076 GB Notification: Performance of simCode: created event and clocks part: time 8.997e-06/3.935, allocations: 1.938 kB / 2.076 GB, free: 358 MB / 1.076 GB Notification: Performance of simCode: created simulation system equations: time 0.002791/3.937, allocations: 2.184 MB / 2.078 GB, free: 358 MB / 1.076 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.004761/3.942, allocations: 467.2 kB / 2.079 GB, free: 357.9 MB / 1.076 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 2.289/6.232, allocations: 1.503 GB / 3.582 GB, free: 354.9 MB / 1.076 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001673/6.233, allocations: 2.321 MB / 3.585 GB, free: 352.5 MB / 1.076 GB Notification: Performance of simCode: alias equations: time 0.003162/6.236, allocations: 1.263 MB / 3.586 GB, free: 351.4 MB / 1.076 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.002658/6.239, allocations: 1.709 MB / 3.587 GB, free: 349.7 MB / 1.076 GB Notification: Performance of SimCode: time 7.91e-07/6.239, allocations: 0 / 3.587 GB, free: 349.7 MB / 1.076 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.8109/7.05, allocations: 248.9 MB / 3.83 GB, free: 102.4 MB / 1.076 GB Notification: Performance of buildModelFMU: Generate platform static: time 16.8/23.85, allocations: 12.05 kB / 3.83 GB, free: 102.4 MB / 1.076 GB (rm -f Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.pipe ; mkfifo Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.pipe ; head -c 1048576 < Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.pipe >> ../files/Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.sim & python3 -m fmpy simulate --output-file Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic_res.csv --start-time 0 --stop-time 864000 --timeout 50 --relative-tolerance 1e-06 Buildings_8_Buildings_HeatTransfer_Windows_BaseClasses_Examples_AbsorbedRadiationElectrochromic.fmu > Buildings_8_Buildings.HeatTransfer.Windows.BaseClasses.Examples.AbsorbedRadiationElectrochromic.pipe 2>&1)