Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.1-maint.8.0.x/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+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/ModelicaServices 3.2.3+maint.om/package.mo", uses=false) Using package ModelicaServices with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/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 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo) Using package Buildings with version 8.0.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.1-maint.8.0.x/package.mo) Running command: "" <> buildModelFMU(Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY,fileNamePrefix="Buildings_maint_8_0_x_Buildings_Electrical_AC_ThreePhasesUnbalanced_Conversion_Examples_TransformerStepDownDY",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY,fileNamePrefix="Buildings_maint_8_0_x_Buildings_Electrical_AC_ThreePhasesUnbalanced_Conversion_Examples_TransformerStepDownDY",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.1-maint.8.0.x/package.mo): time 1.476/1.476, allocations: 288.4 MB / 303.6 MB, free: 8.043 MB / 234.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.0008877/0.0008877, allocations: 176.5 kB / 372.2 MB, free: 10.12 MB / 298.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.192/1.192, allocations: 205.4 MB / 0.631 GB, free: 9.906 MB / 458.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0007894/0.0007895, allocations: 94.28 kB / 0.7444 GB, free: 5.82 MB / 0.5573 GB Notification: Performance of FrontEnd - loaded program: time 0.0004649/0.000465, allocations: 16.28 kB / 0.8676 GB, free: 141.8 MB / 0.6198 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2076/0.208, allocations: 115.3 MB / 0.9802 GB, free: 27.25 MB / 0.6198 GB Notification: Performance of NFInst.instantiate(Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY): time 0.0127/0.2208, allocations: 15.39 MB / 0.9952 GB, free: 11.8 MB / 0.6198 GB Notification: Performance of NFInst.instExpressions: time 0.007077/0.2279, allocations: 5.731 MB / 1.001 GB, free: 6.055 MB / 0.6198 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0007849/0.2287, allocations: 35.94 kB / 1.001 GB, free: 6.02 MB / 0.6198 GB Notification: Performance of NFTyping.typeComponents: time 0.0006558/0.2294, allocations: 313.7 kB / 1.001 GB, free: 5.711 MB / 0.6198 GB Notification: Performance of NFTyping.typeBindings: time 0.001636/0.2311, allocations: 0.9029 MB / 1.002 GB, free: 4.805 MB / 0.6198 GB Notification: Performance of NFTyping.typeClassSections: time 0.00132/0.2324, allocations: 0.6375 MB / 1.003 GB, free: 4.168 MB / 0.6198 GB Notification: Performance of NFFlatten.flatten: time 0.003237/0.2356, allocations: 5.004 MB / 1.008 GB, free: 15.15 MB / 0.6355 GB Notification: Performance of NFFlatten.resolveConnections: time 0.009838/0.2455, allocations: 7.075 MB / 1.014 GB, free: 8 MB / 0.6355 GB Notification: Performance of NFEvalConstants.evaluate: time 0.00311/0.2486, allocations: 1.343 MB / 1.016 GB, free: 6.652 MB / 0.6355 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002708/0.2514, allocations: 1.932 MB / 1.018 GB, free: 4.715 MB / 0.6355 GB Notification: Performance of NFPackage.collectConstants: time 0.0003342/0.2517, allocations: 196 kB / 1.018 GB, free: 4.523 MB / 0.6355 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001904/0.2536, allocations: 1.022 MB / 1.019 GB, free: 3.5 MB / 0.6355 GB Notification: Performance of NFScalarize.scalarize: time 0.001361/0.255, allocations: 1.458 MB / 1.02 GB, free: 2.039 MB / 0.6355 GB Notification: Performance of NFVerifyModel.verify: time 0.001332/0.2563, allocations: 1.367 MB / 1.022 GB, free: 0.6602 MB / 0.6355 GB Notification: Performance of NFConvertDAE.convert: time 0.005567/0.2619, allocations: 5.61 MB / 1.027 GB, free: 11.04 MB / 0.6511 GB Notification: Performance of FrontEnd - DAE generated: time 7.634e-06/0.2619, allocations: 0 / 1.027 GB, free: 11.04 MB / 0.6511 GB Notification: Performance of FrontEnd: time 2.144e-06/0.2619, allocations: 0 / 1.027 GB, free: 11.04 MB / 0.6511 GB Notification: Performance of Transformations before backend: time 8.581e-05/0.262, allocations: 4 kB / 1.027 GB, free: 11.03 MB / 0.6511 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 809 * Number of variables: 809 Notification: Performance of Generate backend data structure: time 0.004545/0.2666, allocations: 2.456 MB / 1.029 GB, free: 8.516 MB / 0.6511 GB Notification: Performance of prepare preOptimizeDAE: time 4.953e-05/0.2666, allocations: 12.03 kB / 1.029 GB, free: 8.504 MB / 0.6511 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0005602/0.2672, allocations: 470.7 kB / 1.03 GB, free: 8.031 MB / 0.6511 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.009919/0.2771, allocations: 2.03 MB / 1.032 GB, free: 5.996 MB / 0.6511 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.00299/0.2801, allocations: 1.639 MB / 1.034 GB, free: 4.316 MB / 0.6511 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001574/0.2803, allocations: 238.5 kB / 1.034 GB, free: 4.082 MB / 0.6511 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000453/0.2808, allocations: 292.4 kB / 1.034 GB, free: 3.797 MB / 0.6511 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.0114/0.2922, allocations: 5.9 MB / 1.04 GB, free: 13.8 MB / 0.6667 GB Notification: Performance of preOpt findStateOrder (simulation): time 6.371e-05/0.2923, allocations: 0 / 1.04 GB, free: 13.8 MB / 0.6667 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0003566/0.2926, allocations: 132 kB / 1.04 GB, free: 13.68 MB / 0.6667 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.0003024/0.2929, allocations: 205 kB / 1.04 GB, free: 13.47 MB / 0.6667 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01293/0.3059, allocations: 5.955 MB / 1.046 GB, free: 7.5 MB / 0.6667 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 0.4039/0.7098, allocations: 23.01 MB / 1.068 GB, free: 79.34 MB / 0.6823 GB Notification: Performance of preOpt comSubExp (simulation): time 0.005284/0.7151, allocations: 2.508 MB / 1.071 GB, free: 78.89 MB / 0.6823 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.006452/0.7216, allocations: 1.814 MB / 1.073 GB, free: 78.84 MB / 0.6823 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002251/0.7219, allocations: 120.2 kB / 1.073 GB, free: 78.74 MB / 0.6823 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.046e-05/0.7219, allocations: 54.02 kB / 1.073 GB, free: 78.7 MB / 0.6823 GB Notification: Performance of pre-optimization done (n=123): time 3.787e-06/0.7219, allocations: 3.781 kB / 1.073 GB, free: 78.7 MB / 0.6823 GB Notification: Performance of matching and sorting (n=153): time 0.03903/0.761, allocations: 11.75 MB / 1.084 GB, free: 75.7 MB / 0.6823 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.529e-05/0.7611, allocations: 227.4 kB / 1.084 GB, free: 75.45 MB / 0.6823 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001655/0.7628, allocations: 1.066 MB / 1.086 GB, free: 75.01 MB / 0.6823 GB Notification: Performance of collectPreVariables (initialization): time 0.000159/0.7629, allocations: 52.23 kB / 1.086 GB, free: 74.96 MB / 0.6823 GB Notification: Performance of collectInitialEqns (initialization): time 0.0007789/0.7637, allocations: 1.254 MB / 1.087 GB, free: 74 MB / 0.6823 GB Notification: Performance of collectInitialBindings (initialization): time 0.0004808/0.7642, allocations: 0.5289 MB / 1.087 GB, free: 73.6 MB / 0.6823 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001611/0.7644, allocations: 45.62 kB / 1.087 GB, free: 73.56 MB / 0.6823 GB Notification: Performance of setup shared object (initialization): time 0.0002006/0.7646, allocations: 429.6 kB / 1.088 GB, free: 73.2 MB / 0.6823 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.004653/0.7693, allocations: 1.809 MB / 1.09 GB, free: 72.7 MB / 0.6823 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.004582/0.7738, allocations: 2.504 MB / 1.092 GB, free: 71.31 MB / 0.6823 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.008645/0.7825, allocations: 4.334 MB / 1.096 GB, free: 69.24 MB / 0.6823 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.231e-05/0.7826, allocations: 6.188 kB / 1.096 GB, free: 69.24 MB / 0.6823 GB Notification: Performance of matching and sorting (n=282) (initialization): time 0.01191/0.7945, allocations: 5.163 MB / 1.101 GB, free: 66.98 MB / 0.6823 GB Notification: Performance of prepare postOptimizeDAE: time 0.000379/0.7949, allocations: 0.7292 MB / 1.102 GB, free: 65.99 MB / 0.6823 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.153e-05/0.7949, allocations: 24.67 kB / 1.102 GB, free: 65.98 MB / 0.6823 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.002705/0.7976, allocations: 0.8684 MB / 1.103 GB, free: 65.56 MB / 0.6823 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.003166/0.8008, allocations: 0.7751 MB / 1.104 GB, free: 65.29 MB / 0.6823 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.01237/0.8132, allocations: 12.79 MB / 1.116 GB, free: 54.21 MB / 0.6823 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.003147/0.8164, allocations: 468.5 kB / 1.117 GB, free: 53.98 MB / 0.6823 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0004164/0.8168, allocations: 115.6 kB / 1.117 GB, free: 53.95 MB / 0.6823 GB Notification: Performance of prepare postOptimizeDAE: time 9.989e-06/0.8168, allocations: 3.781 kB / 1.117 GB, free: 53.95 MB / 0.6823 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.0115/0.8283, allocations: 5.012 MB / 1.122 GB, free: 51.3 MB / 0.6823 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.751e-05/0.8284, allocations: 21.44 kB / 1.122 GB, free: 51.3 MB / 0.6823 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.002014/0.8305, allocations: 0.7533 MB / 1.122 GB, free: 50.9 MB / 0.6823 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002966/0.8334, allocations: 0.7744 MB / 1.123 GB, free: 50.63 MB / 0.6823 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.00959/0.843, allocations: 12.59 MB / 1.135 GB, free: 39.67 MB / 0.6823 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002904/0.846, allocations: 451.2 kB / 1.136 GB, free: 39.45 MB / 0.6823 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0003355/0.8463, allocations: 116.7 kB / 1.136 GB, free: 39.42 MB / 0.6823 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 97 * 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 (240): * Single equations (assignments): 234 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 6 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 6 {(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6} * Non-linear torn systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.002098/0.8484, allocations: 1.341 MB / 1.137 GB, free: 38.53 MB / 0.6823 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0004526/0.8489, allocations: 120.1 kB / 1.137 GB, free: 38.47 MB / 0.6823 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01012/0.859, allocations: 4.587 MB / 1.142 GB, free: 34.51 MB / 0.6823 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.816e-05/0.8591, allocations: 16 kB / 1.142 GB, free: 34.5 MB / 0.6823 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.284e-05/0.8591, allocations: 8 kB / 1.142 GB, free: 34.49 MB / 0.6823 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.432e-05/0.8591, allocations: 3.984 kB / 1.142 GB, free: 34.48 MB / 0.6823 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.01495/0.8741, allocations: 8.304 MB / 1.15 GB, free: 26.01 MB / 0.6823 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.45e-05/0.8741, allocations: 8.125 kB / 1.15 GB, free: 26 MB / 0.6823 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002296/0.8764, allocations: 0.5342 MB / 1.15 GB, free: 25.47 MB / 0.6823 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0019/0.8783, allocations: 0.7101 MB / 1.151 GB, free: 24.75 MB / 0.6823 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001368/0.8785, allocations: 51.95 kB / 1.151 GB, free: 24.7 MB / 0.6823 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.009363/0.8879, allocations: 12.26 MB / 1.163 GB, free: 11.68 MB / 0.6823 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 5.972e-06/0.8879, allocations: 11.94 kB / 1.163 GB, free: 11.66 MB / 0.6823 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.009149/0.8971, allocations: 4.286 MB / 1.167 GB, free: 7.262 MB / 0.6823 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0009161/0.898, allocations: 0.4955 MB / 1.168 GB, free: 6.746 MB / 0.6823 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0003687/0.8984, allocations: 32 kB / 1.168 GB, free: 6.715 MB / 0.6823 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002425/0.9008, allocations: 399.3 kB / 1.168 GB, free: 6.324 MB / 0.6823 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002854/0.9011, allocations: 136.6 kB / 1.168 GB, free: 6.188 MB / 0.6823 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001248/0.9013, allocations: 63.95 kB / 1.168 GB, free: 6.125 MB / 0.6823 GB Notification: Performance of sorting global known variables: time 0.0009318/0.9022, allocations: 0.7683 MB / 1.169 GB, free: 5.355 MB / 0.6823 GB Notification: Performance of sort global known variables: time 1.1e-07/0.9022, allocations: 1.031 kB / 1.169 GB, free: 5.355 MB / 0.6823 GB Notification: Performance of remove unused functions: time 0.004097/0.9063, allocations: 1.148 MB / 1.17 GB, free: 4.207 MB / 0.6823 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 32 * 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 (107): * Single equations (assignments): 101 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 6 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 6 {(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6,(2,100.0%) 6} * Non-linear torn systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.009173/0.9155, allocations: 4.89 MB / 1.175 GB, free: 15.18 MB / 0.698 GB Notification: Performance of simCode: created initialization part: time 0.01789/0.9334, allocations: 8.161 MB / 1.183 GB, free: 6.887 MB / 0.698 GB Notification: Performance of simCode: created event and clocks part: time 9.077e-06/0.9334, allocations: 0 / 1.183 GB, free: 6.887 MB / 0.698 GB Notification: Performance of simCode: created simulation system equations: time 0.005909/0.9393, allocations: 2.751 MB / 1.186 GB, free: 4.062 MB / 0.698 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002265/0.9416, allocations: 195 kB / 1.186 GB, free: 3.879 MB / 0.698 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.04068/0.9823, allocations: 17.97 MB / 1.204 GB, free: 1.258 MB / 0.7136 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002542/0.9849, allocations: 2.332 MB / 1.206 GB, free: 14.89 MB / 0.7292 GB Notification: Performance of simCode: alias equations: time 0.003813/0.9888, allocations: 1.296 MB / 1.207 GB, free: 13.59 MB / 0.7292 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001247/0.99, allocations: 0.8663 MB / 1.208 GB, free: 12.72 MB / 0.7292 GB Notification: Performance of SimCode: time 5.11e-07/0.99, allocations: 0 / 1.208 GB, free: 12.72 MB / 0.7292 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 2.766/3.756, allocations: 48.49 MB / 1.255 GB, free: 12.52 MB / 0.7761 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002329/3.756, allocations: 252 kB / 1.255 GB, free: 12.18 MB / 0.7761 GB Notification: Performance of buildModelFMU: Generate platform static: time 4.288/8.045, allocations: 0 / 1.255 GB, free: 12.18 MB / 0.7761 GB (rm -f Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.pipe ; mkfifo Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.pipe ; head -c 1048576 < Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.pipe >> ../files/Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_Buildings_maint_8_0_x_Buildings_Electrical_AC_ThreePhasesUnbalanced_Conversion_Examples_TransformerStepDownDY_fmu --startTime=0 --stopTime=1 --timeout=50 --tolerance=1e-06 Buildings_maint_8_0_x_Buildings_Electrical_AC_ThreePhasesUnbalanced_Conversion_Examples_TransformerStepDownDY.fmu > Buildings_maint.8.0.x_Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.Examples.TransformerStepDownDY.pipe 2>&1)