Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices trunk/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex trunk/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0-beta.om/package.mo", uses=false) Using package Modelica with version 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0-beta.om/package.mo) Using package Complex with version trunk (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex trunk/package.mo) Using package ModelicaServices with version trunk (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices trunk/package.mo) Running command: "" <> buildModelFMU(Modelica.Fluid.Examples.Tanks.ThreeTanks,fileNamePrefix="Modelica_4_1_0-beta_om_Modelica_Fluid_Examples_Tanks_ThreeTanks",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Modelica.Fluid.Examples.Tanks.ThreeTanks,fileNamePrefix="Modelica_4_1_0-beta_om_Modelica_Fluid_Examples_Tanks_ThreeTanks",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices trunk/package.mo): time 0.001284/0.001284, allocations: 104.1 kB / 17.63 MB, free: 5.344 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex trunk/package.mo): time 0.001386/0.001386, allocations: 214.4 kB / 18.59 MB, free: 4.402 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.1.0-beta.om/package.mo): time 1.477/1.477, allocations: 227.7 MB / 247.1 MB, free: 10.3 MB / 206.1 MB Warning: Requested package Modelica of version trunk, but this package was already loaded with version 4.1.0. OpenModelica cannot reason about compatibility between the two packages since they are not semantic versions. Warning: Requested package Complex of version 4.1.0, but this package was already loaded with version trunk. OpenModelica cannot reason about compatibility between the two packages since they are not semantic versions. Warning: Requested package ModelicaServices of version 4.1.0, but this package was already loaded with version trunk. OpenModelica cannot reason about compatibility between the two packages since they are not semantic versions. Notification: Performance of FrontEnd - loaded program: time 0.001953/0.001954, allocations: 61 kB / 307.3 MB, free: 404 kB / 238.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1105/0.1125, allocations: 50.54 MB / 357.9 MB, free: 13.84 MB / 302.1 MB Notification: Performance of NFInst.instantiate(Modelica.Fluid.Examples.Tanks.ThreeTanks): time 0.2117/0.3243, allocations: 28.85 MB / 386.7 MB, free: 5.258 MB / 302.1 MB Notification: Performance of NFInst.instExpressions: time 0.02179/0.3461, allocations: 15.04 MB / 401.7 MB, free: 10.66 MB / 318.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.002439/0.3486, allocations: 42.72 kB / 401.8 MB, free: 10.65 MB / 318.1 MB Notification: Performance of NFTyping.typeComponents: time 0.001768/0.3504, allocations: 0.5902 MB / 402.4 MB, free: 10.19 MB / 318.1 MB Notification: Performance of NFTyping.typeBindings: time 0.0067/0.3571, allocations: 2.302 MB / 404.7 MB, free: 8.43 MB / 318.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.01152/0.3686, allocations: 3.725 MB / 408.4 MB, free: 5.895 MB / 318.1 MB Notification: Performance of NFFlatten.flatten: time 0.007459/0.3761, allocations: 4.145 MB / 412.6 MB, free: 3.59 MB / 318.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.002199/0.3784, allocations: 1.156 MB / 413.7 MB, free: 2.797 MB / 318.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.00359/0.382, allocations: 1.545 MB / 415.3 MB, free: 1.965 MB / 318.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.003773/0.3858, allocations: 1.664 MB / 416.9 MB, free: 308 kB / 318.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0004867/0.3863, allocations: 160 kB / 417.1 MB, free: 148 kB / 318.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.006692/0.393, allocations: 2.457 MB / 419.5 MB, free: 13.68 MB / 334.1 MB Notification: Performance of NFScalarize.scalarize: time 0.001007/0.394, allocations: 0.6155 MB / 420.1 MB, free: 13.06 MB / 334.1 MB Notification: Performance of NFVerifyModel.verify: time 0.001625/0.3957, allocations: 0.8711 MB / 421 MB, free: 12.19 MB / 334.1 MB Notification: Performance of NFConvertDAE.convert: time 0.008005/0.4037, allocations: 3.733 MB / 424.7 MB, free: 8.445 MB / 334.1 MB Notification: Performance of FrontEnd - DAE generated: time 5.31e-06/0.4037, allocations: 0 / 424.7 MB, free: 8.445 MB / 334.1 MB Notification: Performance of FrontEnd: time 8.456e-06/0.4037, allocations: 0 / 424.7 MB, free: 8.445 MB / 334.1 MB Notification: Performance of Transformations before backend: time 3.79e-05/0.4038, allocations: 3.938 kB / 424.8 MB, free: 8.441 MB / 334.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 261 * Number of variables: 261 Notification: Performance of Generate backend data structure: time 0.005708/0.4095, allocations: 2.205 MB / 427 MB, free: 6.184 MB / 334.1 MB Notification: Performance of prepare preOptimizeDAE: time 4.16e-05/0.4096, allocations: 12.03 kB / 427 MB, free: 6.172 MB / 334.1 MB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.00026/0.4098, allocations: 168.4 kB / 427.1 MB, free: 6 MB / 334.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0006102/0.4104, allocations: 174.1 kB / 427.3 MB, free: 5.828 MB / 334.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001776/0.4122, allocations: 0.9989 MB / 428.3 MB, free: 4.785 MB / 334.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001953/0.4124, allocations: 187 kB / 428.5 MB, free: 4.582 MB / 334.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000201/0.4126, allocations: 99.97 kB / 428.6 MB, free: 4.484 MB / 334.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003294/0.4159, allocations: 1.757 MB / 430.3 MB, free: 2.676 MB / 334.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 3.405e-05/0.416, allocations: 3.906 kB / 430.3 MB, free: 2.672 MB / 334.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001794/0.4162, allocations: 47.97 kB / 430.4 MB, free: 2.625 MB / 334.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.0001757/0.4164, allocations: 113.9 kB / 430.5 MB, free: 2.512 MB / 334.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003299/0.4197, allocations: 1.776 MB / 432.3 MB, free: 0.7266 MB / 334.1 MB 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 0.01319/0.4329, allocations: 6.716 MB / 439 MB, free: 9.68 MB / 350.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.002101/0.435, allocations: 1.239 MB / 440.2 MB, free: 8.426 MB / 350.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.001312/0.4363, allocations: 0.7651 MB / 441 MB, free: 7.66 MB / 350.1 MB Notification: Performance of preOpt evalFunc (simulation): time 0.006691/0.443, allocations: 4.271 MB / 445.3 MB, free: 2.973 MB / 350.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 6.152e-05/0.4432, allocations: 51.56 kB / 445.3 MB, free: 2.914 MB / 350.1 MB Notification: Performance of preOpt simplifyInStream (simulation): time 0.0008524/0.444, allocations: 170.7 kB / 445.5 MB, free: 2.746 MB / 350.1 MB Notification: Performance of pre-optimization done (n=97): time 5.932e-06/0.444, allocations: 0 / 445.5 MB, free: 2.746 MB / 350.1 MB Notification: Performance of matching and sorting (n=112): time 0.01967/0.4637, allocations: 5.701 MB / 451.2 MB, free: 12.98 MB / 366.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001208/0.4639, allocations: 145.5 kB / 451.3 MB, free: 12.81 MB / 366.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001858/0.4657, allocations: 1.25 MB / 452.6 MB, free: 11.55 MB / 366.1 MB Notification: Performance of collectPreVariables (initialization): time 0.0001883/0.4659, allocations: 49.7 kB / 452.6 MB, free: 11.5 MB / 366.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.0005733/0.4665, allocations: 0.6129 MB / 453.2 MB, free: 10.88 MB / 366.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0004419/0.467, allocations: 390.5 kB / 453.6 MB, free: 10.49 MB / 366.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0004961/0.4675, allocations: 291.4 kB / 453.9 MB, free: 10.2 MB / 366.1 MB Notification: Performance of setup shared object (initialization): time 0.0001392/0.4676, allocations: 301.1 kB / 454.2 MB, free: 9.902 MB / 366.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001286/0.4689, allocations: 0.7192 MB / 454.9 MB, free: 9.18 MB / 366.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001618/0.4706, allocations: 1.064 MB / 456 MB, free: 7.977 MB / 366.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.00295/0.4735, allocations: 1.751 MB / 457.7 MB, free: 6.094 MB / 366.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.035e-06/0.4735, allocations: 0 / 457.7 MB, free: 6.094 MB / 366.1 MB Notification: Performance of matching and sorting (n=181) (initialization): time 0.004649/0.4782, allocations: 2.284 MB / 460 MB, free: 3.797 MB / 366.1 MB Notification: Performance of prepare postOptimizeDAE: time 3.266e-05/0.4783, allocations: 15.92 kB / 460 MB, free: 3.781 MB / 366.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.926e-05/0.4783, allocations: 12.64 kB / 460 MB, free: 3.77 MB / 366.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.007105/0.4854, allocations: 1.284 MB / 461.3 MB, free: 2.48 MB / 366.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001397/0.4868, allocations: 295.5 kB / 461.6 MB, free: 2.191 MB / 366.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002726/0.4896, allocations: 1.599 MB / 463.2 MB, free: 0.5625 MB / 366.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.00139/0.491, allocations: 59.97 kB / 463.3 MB, free: 0.5039 MB / 366.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001717/0.4912, allocations: 67.97 kB / 463.3 MB, free: 448 kB / 366.1 MB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.001804/0.493, allocations: 0.9801 MB / 464.3 MB, free: 15.45 MB / 382.1 MB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.001561/0.4945, allocations: 1.063 MB / 465.4 MB, free: 14.24 MB / 382.1 MB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.002796/0.4974, allocations: 1.722 MB / 467.1 MB, free: 12.38 MB / 382.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.871e-06/0.4974, allocations: 4 kB / 467.1 MB, free: 12.37 MB / 382.1 MB Notification: Performance of matching and sorting (n=181) (initialization_lambda0): time 0.004274/0.5017, allocations: 2.199 MB / 469.3 MB, free: 10.16 MB / 382.1 MB Notification: Performance of prepare postOptimizeDAE: time 2.125e-05/0.5017, allocations: 12 kB / 469.3 MB, free: 10.15 MB / 382.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.405e-05/0.5017, allocations: 8 kB / 469.3 MB, free: 10.14 MB / 382.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.006161/0.5079, allocations: 1.095 MB / 470.4 MB, free: 9.043 MB / 382.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001349/0.5093, allocations: 311.5 kB / 470.7 MB, free: 8.738 MB / 382.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002211/0.5115, allocations: 1.45 MB / 472.2 MB, free: 7.262 MB / 382.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001409/0.5129, allocations: 63.95 kB / 472.2 MB, free: 7.199 MB / 382.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000204/0.5131, allocations: 83.84 kB / 472.3 MB, free: 7.117 MB / 382.1 MB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 43 * Number of states: 0 () * Number of discrete variables: 6 (tank3.inFlow[1],tank3.regularFlow[1],tank2.inFlow[1],tank2.regularFlow[1],tank1.inFlow[1],tank1.regularFlow[1]) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (156): * Single equations (assignments): 155 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 0 systems * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(8,18)} Notification: Performance of prepare postOptimizeDAE: time 0.000558/0.5137, allocations: 267.9 kB / 472.6 MB, free: 6.848 MB / 382.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0004353/0.5141, allocations: 142.3 kB / 472.7 MB, free: 6.707 MB / 382.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004596/0.5187, allocations: 2.092 MB / 474.8 MB, free: 4.602 MB / 382.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.748e-05/0.5188, allocations: 15.94 kB / 474.8 MB, free: 4.586 MB / 382.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.644e-06/0.5188, allocations: 0 / 474.8 MB, free: 4.586 MB / 382.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.615e-05/0.5188, allocations: 7.969 kB / 474.8 MB, free: 4.578 MB / 382.1 MB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.006852/0.5257, allocations: 3.583 MB / 478.4 MB, free: 0.9375 MB / 382.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.813e-06/0.5257, allocations: 0 / 478.4 MB, free: 0.9375 MB / 382.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.000949/0.5267, allocations: 191.8 kB / 478.6 MB, free: 0.75 MB / 382.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 0.002487/0.5292, allocations: 0.8598 MB / 479.5 MB, free: 15.89 MB / 398.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001126/0.5293, allocations: 31.98 kB / 479.5 MB, free: 15.86 MB / 398.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002421/0.5317, allocations: 1.615 MB / 481.1 MB, free: 14.21 MB / 398.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.238e-06/0.5318, allocations: 3.938 kB / 481.1 MB, free: 14.21 MB / 398.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005091/0.5369, allocations: 2.911 MB / 484 MB, free: 11.29 MB / 398.1 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0009219/0.5378, allocations: 387.2 kB / 484.4 MB, free: 10.89 MB / 398.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002617/0.5381, allocations: 20 kB / 484.4 MB, free: 10.87 MB / 398.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001006/0.5391, allocations: 63.95 kB / 484.5 MB, free: 10.8 MB / 398.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000253/0.5394, allocations: 97.3 kB / 484.6 MB, free: 10.71 MB / 398.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001241/0.5395, allocations: 51.97 kB / 484.6 MB, free: 10.66 MB / 398.1 MB Notification: Performance of sorting global known variables: time 0.001273/0.5408, allocations: 0.8518 MB / 485.5 MB, free: 9.801 MB / 398.1 MB Notification: Performance of sort global known variables: time 2.21e-07/0.5408, allocations: 0 / 485.5 MB, free: 9.801 MB / 398.1 MB Notification: Performance of remove unused functions: time 0.002979/0.5438, allocations: 1.163 MB / 486.7 MB, free: 8.637 MB / 398.1 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 6 (tank1.level,tank1.medium.T,tank2.level,tank2.medium.T,tank3.level,tank3.medium.T) * Number of discrete variables: 6 (tank1.regularFlow[1],tank1.inFlow[1],tank2.regularFlow[1],tank2.inFlow[1],tank3.regularFlow[1],tank3.inFlow[1]) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (96): * Single equations (assignments): 95 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 0 systems * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(9,29)} Notification: Performance of Backend phase and start with SimCode phase: time 0.007041/0.5508, allocations: 4.213 MB / 490.9 MB, free: 4.398 MB / 398.1 MB Notification: Performance of simCode: created initialization part: time 0.008046/0.5589, allocations: 3.304 MB / 494.2 MB, free: 1.094 MB / 398.1 MB Notification: Performance of simCode: created event and clocks part: time 8.556e-06/0.5589, allocations: 4 kB / 494.2 MB, free: 1.09 MB / 398.1 MB Notification: Performance of simCode: created simulation system equations: time 0.001871/0.5608, allocations: 0.8676 MB / 495 MB, free: 232 kB / 398.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00342/0.5643, allocations: 0.6754 MB / 495.7 MB, free: 15.57 MB / 414.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.02705/0.5913, allocations: 15.14 MB / 0.4989 GB, free: 15.7 MB / 430.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001031/0.5924, allocations: 1.3 MB / 0.5002 GB, free: 14.37 MB / 430.1 MB Notification: Performance of simCode: alias equations: time 0.00216/0.5946, allocations: 0.5823 MB / 0.5007 GB, free: 13.78 MB / 430.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0008105/0.5954, allocations: 0.5422 MB / 0.5013 GB, free: 13.24 MB / 430.1 MB Notification: Performance of SimCode: time 1.132e-06/0.5954, allocations: 4 kB / 0.5013 GB, free: 13.23 MB / 430.1 MB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.2764/0.8718, allocations: 57.51 MB / 0.5574 GB, free: 140.9 MB / 446.1 MB Notification: Performance of buildModelFMU: Generate platform static: time 12.94/13.81, allocations: 14.02 kB / 0.5574 GB, free: 140.9 MB / 446.1 MB (rm -f Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.pipe ; mkfifo Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.pipe ; head -c 1048576 < Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.pipe >> ../files/Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks_res.mat --tempDir=temp_Modelica_4_1_0-beta_om_Modelica_Fluid_Examples_Tanks_ThreeTanks_fmu --startTime=0 --stopTime=200 --timeout=50 --tolerance=1e-06 Modelica_4_1_0-beta_om_Modelica_Fluid_Examples_Tanks_ThreeTanks.fmu > Modelica_4.1.0-beta.om_Modelica.Fluid.Examples.Tanks.ThreeTanks.pipe 2>&1)