Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.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/IBPSA 4.0.0-master/package.mo", uses=false) Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-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(IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_Movers_Examples_SpeedControlled_y_pumpCurves",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_Movers_Examples_SpeedControlled_y_pumpCurves",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 0.001082/0.001082, allocations: 100.9 kB / 16.27 MB, free: 5.93 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001145/0.001145, allocations: 186.3 kB / 17.2 MB, free: 5.574 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.26/1.26, allocations: 222.9 MB / 240.9 MB, free: 15.28 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.7285/0.7285, allocations: 122.9 MB / 413.9 MB, free: 15.83 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001242/0.001242, allocations: 63.89 kB / 0.4912 GB, free: 7.344 MB / 414.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2955/0.2968, allocations: 77.92 MB / 0.5673 GB, free: 32.74 MB / 446.1 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves): time 0.0906/0.3874, allocations: 106.4 MB / 0.6712 GB, free: 100 kB / 0.4981 GB Notification: Performance of NFInst.instExpressions: time 0.04471/0.4321, allocations: 35.45 MB / 0.7058 GB, free: 12.56 MB / 0.545 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.006478/0.4386, allocations: 163.1 kB / 0.706 GB, free: 12.4 MB / 0.545 GB Notification: Performance of NFTyping.typeComponents: time 0.02944/0.4681, allocations: 18.57 MB / 0.7241 GB, free: 9.801 MB / 0.5606 GB Notification: Performance of NFTyping.typeBindings: time 0.01397/0.4821, allocations: 5.379 MB / 0.7294 GB, free: 4.398 MB / 0.5606 GB Notification: Performance of NFTyping.typeClassSections: time 0.00954/0.4917, allocations: 4.057 MB / 0.7333 GB, free: 376 kB / 0.5606 GB Notification: Performance of NFFlatten.flatten: time 0.2973/0.789, allocations: 31.91 MB / 0.7645 GB, free: 35.41 MB / 0.5762 GB Notification: Performance of NFFlatten.resolveConnections: time 0.005357/0.7944, allocations: 3.574 MB / 0.768 GB, free: 35.08 MB / 0.5762 GB Notification: Performance of NFEvalConstants.evaluate: time 0.008303/0.8027, allocations: 4.176 MB / 0.7721 GB, free: 35.06 MB / 0.5762 GB Notification: Performance of NFSimplifyModel.simplify: time 0.005035/0.8077, allocations: 3.307 MB / 0.7753 GB, free: 34.51 MB / 0.5762 GB Notification: Performance of NFPackage.collectConstants: time 0.0009415/0.8087, allocations: 453.3 kB / 0.7757 GB, free: 34.51 MB / 0.5762 GB Notification: Performance of NFFlatten.collectFunctions: time 0.005482/0.8142, allocations: 2.982 MB / 0.7786 GB, free: 34.5 MB / 0.5762 GB Notification: Performance of NFScalarize.scalarize: time 0.00129/0.8155, allocations: 1.919 MB / 0.7805 GB, free: 34.27 MB / 0.5762 GB Notification: Performance of NFVerifyModel.verify: time 0.002774/0.8183, allocations: 3.114 MB / 0.7836 GB, free: 33.34 MB / 0.5762 GB Notification: Performance of NFConvertDAE.convert: time 0.008394/0.8267, allocations: 9.407 MB / 0.7927 GB, free: 32.23 MB / 0.5762 GB Notification: Performance of FrontEnd - DAE generated: time 4.087e-06/0.8267, allocations: 0 / 0.7927 GB, free: 32.23 MB / 0.5762 GB Notification: Performance of FrontEnd: time 1.523e-06/0.8267, allocations: 0 / 0.7927 GB, free: 32.23 MB / 0.5762 GB Notification: Performance of Transformations before backend: time 0.0001147/0.8268, allocations: 0 / 0.7927 GB, free: 32.23 MB / 0.5762 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 545 * Number of variables: 545 Notification: Performance of Generate backend data structure: time 0.009533/0.8364, allocations: 6.531 MB / 0.7991 GB, free: 28.73 MB / 0.5762 GB Notification: Performance of prepare preOptimizeDAE: time 3.711e-05/0.8364, allocations: 10.03 kB / 0.7991 GB, free: 28.73 MB / 0.5762 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002911/0.8367, allocations: 295.6 kB / 0.7994 GB, free: 28.63 MB / 0.5762 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01077/0.8475, allocations: 1.92 MB / 0.8013 GB, free: 27.77 MB / 0.5762 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.02752/0.875, allocations: 17.98 MB / 0.8188 GB, free: 18.35 MB / 0.5762 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0002566/0.8753, allocations: 199.6 kB / 0.819 GB, free: 18.23 MB / 0.5762 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0005967/0.8759, allocations: 250.2 kB / 0.8193 GB, free: 18.06 MB / 0.5762 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.005348/0.8813, allocations: 3.41 MB / 0.8226 GB, free: 15.54 MB / 0.5762 GB Notification: Performance of preOpt findStateOrder (simulation): time 3.708e-05/0.8813, allocations: 3.375 kB / 0.8226 GB, free: 15.54 MB / 0.5762 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0002386/0.8816, allocations: 92 kB / 0.8227 GB, free: 15.52 MB / 0.5762 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 2.705e-05/0.8816, allocations: 52 kB / 0.8227 GB, free: 15.46 MB / 0.5762 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.005857/0.8875, allocations: 2.59 MB / 0.8253 GB, free: 13.64 MB / 0.5762 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 0.01672/0.9042, allocations: 15.36 MB / 0.8403 GB, free: 15 MB / 0.5919 GB Notification: Performance of preOpt comSubExp (simulation): time 0.005909/0.9101, allocations: 2.438 MB / 0.8426 GB, free: 12.58 MB / 0.5919 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.002552/0.9127, allocations: 1.059 MB / 0.8437 GB, free: 11.52 MB / 0.5919 GB Notification: Performance of preOpt evalFunc (simulation): time 0.008445/0.9212, allocations: 5.392 MB / 0.8489 GB, free: 5.863 MB / 0.5919 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.331e-05/0.9212, allocations: 43.56 kB / 0.849 GB, free: 5.812 MB / 0.5919 GB Notification: Performance of pre-optimization done (n=115): time 2.986e-06/0.9212, allocations: 0 / 0.849 GB, free: 5.812 MB / 0.5919 GB Notification: Performance of matching and sorting (n=115): time 0.0126/0.9338, allocations: 4.267 MB / 0.8532 GB, free: 1.48 MB / 0.5919 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.739e-05/0.9339, allocations: 67.88 kB / 0.8532 GB, free: 1.406 MB / 0.5919 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.00921/0.9431, allocations: 5.753 MB / 0.8588 GB, free: 11.66 MB / 0.6075 GB Notification: Performance of collectPreVariables (initialization): time 0.0005543/0.9437, allocations: 61.7 kB / 0.8589 GB, free: 11.59 MB / 0.6075 GB Notification: Performance of collectInitialEqns (initialization): time 0.001964/0.9457, allocations: 2.324 MB / 0.8612 GB, free: 9.281 MB / 0.6075 GB Notification: Performance of collectInitialBindings (initialization): time 0.000492/0.9462, allocations: 426.7 kB / 0.8616 GB, free: 8.867 MB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.001327/0.9475, allocations: 0.9072 MB / 0.8625 GB, free: 7.957 MB / 0.6075 GB Notification: Performance of setup shared object (initialization): time 9.895e-05/0.9476, allocations: 305.1 kB / 0.8628 GB, free: 7.656 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.004781/0.9524, allocations: 2.914 MB / 0.8656 GB, free: 4.734 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.005364/0.9578, allocations: 3.79 MB / 0.8693 GB, free: 0.625 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.009421/0.9672, allocations: 6.18 MB / 0.8753 GB, free: 10.25 MB / 0.6231 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.06e-05/0.9672, allocations: 8 kB / 0.8753 GB, free: 10.24 MB / 0.6231 GB Notification: Performance of matching and sorting (n=503) (initialization): time 0.01289/0.9801, allocations: 7.834 MB / 0.883 GB, free: 2.469 MB / 0.6231 GB Notification: Performance of prepare postOptimizeDAE: time 2.768e-05/0.9802, allocations: 12 kB / 0.883 GB, free: 2.457 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.308e-05/0.9802, allocations: 20 kB / 0.883 GB, free: 2.438 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.002101/0.9823, allocations: 0.9744 MB / 0.884 GB, free: 1.457 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002885/0.9852, allocations: 0.6821 MB / 0.8846 GB, free: 0.8125 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002509/0.9877, allocations: 2.962 MB / 0.8875 GB, free: 13.77 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.004291/0.9921, allocations: 474 kB / 0.888 GB, free: 13.3 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0003811/0.9924, allocations: 223.9 kB / 0.8882 GB, free: 13.08 MB / 0.6387 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.005887/0.9983, allocations: 3.533 MB / 0.8916 GB, free: 9.543 MB / 0.6387 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.004682/1.003, allocations: 3.319 MB / 0.8949 GB, free: 5.898 MB / 0.6387 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.00793/1.011, allocations: 5.237 MB / 0.9 GB, free: 480 kB / 0.6387 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 1.044e-05/1.011, allocations: 7.844 kB / 0.9 GB, free: 476 kB / 0.6387 GB Notification: Performance of matching and sorting (n=503) (initialization_lambda0): time 0.01257/1.024, allocations: 6.941 MB / 0.9068 GB, free: 9.605 MB / 0.6544 GB Notification: Performance of prepare postOptimizeDAE: time 2.871e-05/1.024, allocations: 12.94 kB / 0.9068 GB, free: 9.594 MB / 0.6544 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.276e-05/1.024, allocations: 20.25 kB / 0.9068 GB, free: 9.574 MB / 0.6544 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.00309/1.027, allocations: 1.088 MB / 0.9079 GB, free: 8.477 MB / 0.6544 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002589/1.029, allocations: 0.6491 MB / 0.9085 GB, free: 7.863 MB / 0.6544 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.02021/1.05, allocations: 16.56 MB / 0.9247 GB, free: 6.734 MB / 0.67 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.004604/1.054, allocations: 380.1 kB / 0.925 GB, free: 6.359 MB / 0.67 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000483/1.055, allocations: 187.9 kB / 0.9252 GB, free: 6.176 MB / 0.67 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 81 * Number of states: 0 () * Number of discrete variables: 0 () * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (339): * Single equations (assignments): 327 * Array equations: 4 * Algorithm blocks: 0 * Record equations: 4 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 4 * 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): 4 systems {(1,4), (1,4), (1,4), (1,4)} Notification: Performance of prepare postOptimizeDAE: time 0.0007531/1.055, allocations: 335.1 kB / 0.9255 GB, free: 5.879 MB / 0.67 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001053/1.057, allocations: 0.4972 MB / 0.926 GB, free: 5.375 MB / 0.67 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.008876/1.065, allocations: 3.564 MB / 0.9295 GB, free: 1.848 MB / 0.67 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.58e-05/1.065, allocations: 16 kB / 0.9295 GB, free: 1.832 MB / 0.67 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.607e-06/1.065, allocations: 0 / 0.9295 GB, free: 1.832 MB / 0.67 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.53e-05/1.065, allocations: 7.969 kB / 0.9295 GB, free: 1.824 MB / 0.67 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.01303/1.079, allocations: 6.555 MB / 0.9359 GB, free: 11.25 MB / 0.6856 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 8.096e-06/1.079, allocations: 0 / 0.9359 GB, free: 11.25 MB / 0.6856 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001781/1.08, allocations: 321.7 kB / 0.9362 GB, free: 10.94 MB / 0.6856 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001079/1.081, allocations: 462 kB / 0.9367 GB, free: 10.48 MB / 0.6856 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001245/1.082, allocations: 47.95 kB / 0.9367 GB, free: 10.43 MB / 0.6856 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001986/1.084, allocations: 2.801 MB / 0.9395 GB, free: 7.539 MB / 0.6856 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.298e-06/1.084, allocations: 8.188 kB / 0.9395 GB, free: 7.531 MB / 0.6856 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0078/1.091, allocations: 3.297 MB / 0.9427 GB, free: 4.203 MB / 0.6856 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001747/1.093, allocations: 0.8141 MB / 0.9435 GB, free: 3.363 MB / 0.6856 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0005974/1.094, allocations: 27.56 kB / 0.9435 GB, free: 3.34 MB / 0.6856 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002415/1.096, allocations: 159.8 kB / 0.9437 GB, free: 3.184 MB / 0.6856 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001837/1.096, allocations: 93.19 kB / 0.9438 GB, free: 3.09 MB / 0.6856 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001746/1.097, allocations: 95.92 kB / 0.9438 GB, free: 2.996 MB / 0.6856 GB Notification: Performance of sorting global known variables: time 0.00618/1.103, allocations: 3.801 MB / 0.9476 GB, free: 15.21 MB / 0.7012 GB Notification: Performance of sort global known variables: time 4.11e-07/1.103, allocations: 0 / 0.9476 GB, free: 15.21 MB / 0.7012 GB Notification: Performance of remove unused functions: time 0.006112/1.109, allocations: 2.405 MB / 0.9499 GB, free: 12.8 MB / 0.7012 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 5 * Number of states: 0 () * Number of discrete variables: 0 () * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (121): * Single equations (assignments): 107 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 10 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 4 * 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): 4 systems {(1,5), (1,5), (1,5), (1,5)} Notification: Performance of Backend phase and start with SimCode phase: time 0.008615/1.118, allocations: 4.385 MB / 0.9542 GB, free: 8.445 MB / 0.7012 GB Notification: Performance of simCode: created initialization part: time 0.01625/1.134, allocations: 8.491 MB / 0.9625 GB, free: 64 kB / 0.7012 GB Notification: Performance of simCode: created event and clocks part: time 5.711e-06/1.134, allocations: 0 / 0.9625 GB, free: 64 kB / 0.7012 GB Notification: Performance of simCode: created simulation system equations: time 0.003251/1.137, allocations: 1.227 MB / 0.9637 GB, free: 14.86 MB / 0.7169 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.01005/1.147, allocations: 2.544 MB / 0.9662 GB, free: 12.41 MB / 0.7169 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.07824/1.225, allocations: 56.38 MB / 1.021 GB, free: 0.8047 MB / 0.7637 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.2131/1.439, allocations: 2.954 MB / 1.024 GB, free: 332.6 MB / 0.7637 GB Notification: Performance of simCode: alias equations: time 0.00737/1.446, allocations: 1.394 MB / 1.025 GB, free: 332.5 MB / 0.7637 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.003316/1.449, allocations: 2.288 MB / 1.028 GB, free: 332.5 MB / 0.7637 GB Notification: Performance of SimCode: time 8.62e-07/1.449, allocations: 0.5938 kB / 1.028 GB, free: 332.5 MB / 0.7637 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.1862/1.635, allocations: 152.7 MB / 1.177 GB, free: 209.8 MB / 0.7637 GB Notification: Performance of buildModelFMU: Generate platform static: time 15.01/16.64, allocations: 0 / 1.177 GB, free: 209.8 MB / 0.7637 GB (rm -f IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.sim & python3 -m fmpy simulate --output-file IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves_res.csv --start-time 0 --stop-time 1 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.0004 IBPSA_latest_IBPSA_Fluid_Movers_Examples_SpeedControlled_y_pumpCurves.fmu > IBPSA_latest_IBPSA.Fluid.Movers.Examples.SpeedControlled_y_pumpCurves.pipe 2>&1)