Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.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/Modelica 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/OpenIPSL 3.0.1/package.mo", uses=false) Using package OpenIPSL with version 3.0.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 3.0.1/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 Modelica with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 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: translateModel(OpenIPSL.Tests.Controls.PSSE.ES.EXST1,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1") translateModel(OpenIPSL.Tests.Controls.PSSE.ES.EXST1,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.00127/0.00127, allocations: 108 kB / 15.6 MB, free: 132 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.408/1.408, allocations: 222.9 MB / 239.2 MB, free: 4.582 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001387/0.001387, allocations: 188.5 kB / 289.5 MB, free: 2.324 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 3.0.1/package.mo): time 0.4737/0.4737, allocations: 78.53 MB / 418.2 MB, free: 3.25 MB / 286.1 MB Notification: Performance of FrontEnd - loaded program: time 0.002786/0.002786, allocations: 79.88 kB / 497.4 MB, free: 6.406 MB / 366.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1651/0.1679, allocations: 68.18 MB / 0.5524 GB, free: 2.191 MB / 430.1 MB Notification: Performance of NFInst.instantiate(OpenIPSL.Tests.Controls.PSSE.ES.EXST1): time 0.2829/0.4509, allocations: 8.32 MB / 0.5605 GB, free: 34.95 MB / 430.1 MB Notification: Performance of NFInst.instExpressions: time 0.005833/0.4568, allocations: 2.665 MB / 0.5631 GB, free: 34.25 MB / 430.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.001872/0.4587, allocations: 14.22 kB / 0.5631 GB, free: 34.25 MB / 430.1 MB Notification: Performance of NFTyping.typeComponents: time 0.001375/0.4601, allocations: 319.5 kB / 0.5634 GB, free: 34.24 MB / 430.1 MB Notification: Performance of NFTyping.typeBindings: time 0.003925/0.4641, allocations: 1.211 MB / 0.5646 GB, free: 33.89 MB / 430.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.001991/0.4661, allocations: 0.7521 MB / 0.5653 GB, free: 33.82 MB / 430.1 MB Notification: Performance of NFFlatten.flatten: time 0.00348/0.4696, allocations: 2.416 MB / 0.5677 GB, free: 33.36 MB / 430.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.0008548/0.4705, allocations: 415.1 kB / 0.5681 GB, free: 33.28 MB / 430.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.00159/0.4721, allocations: 0.9149 MB / 0.569 GB, free: 33.06 MB / 430.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.001901/0.474, allocations: 1.161 MB / 0.5701 GB, free: 32.78 MB / 430.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0008861/0.4749, allocations: 188 kB / 0.5703 GB, free: 32.78 MB / 430.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.001594/0.4765, allocations: 367.8 kB / 0.5706 GB, free: 32.77 MB / 430.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0006688/0.4772, allocations: 484.8 kB / 0.5711 GB, free: 32.66 MB / 430.1 MB Notification: Performance of NFVerifyModel.verify: time 0.001148/0.4784, allocations: 0.9323 MB / 0.572 GB, free: 32.34 MB / 430.1 MB Notification: Performance of NFConvertDAE.convert: time 0.002278/0.4807, allocations: 2.303 MB / 0.5743 GB, free: 31.84 MB / 430.1 MB Notification: Performance of FrontEnd - DAE generated: time 5.71e-06/0.4807, allocations: 0 / 0.5743 GB, free: 31.84 MB / 430.1 MB Notification: Performance of FrontEnd: time 1.694e-06/0.4807, allocations: 0 / 0.5743 GB, free: 31.84 MB / 430.1 MB Notification: Performance of Transformations before backend: time 4.391e-05/0.4807, allocations: 0 / 0.5743 GB, free: 31.84 MB / 430.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 249 * Number of variables: 249 Notification: Performance of Generate backend data structure: time 0.01452/0.4953, allocations: 3.94 MB / 0.5781 GB, free: 30.65 MB / 430.1 MB Notification: Performance of prepare preOptimizeDAE: time 5.632e-05/0.4953, allocations: 8.75 kB / 0.5781 GB, free: 30.65 MB / 430.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004651/0.5, allocations: 0.7582 MB / 0.5789 GB, free: 30.48 MB / 430.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002185/0.5022, allocations: 1.148 MB / 0.58 GB, free: 29.74 MB / 430.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0004899/0.5027, allocations: 498.8 kB / 0.5805 GB, free: 29.29 MB / 430.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000226/0.5029, allocations: 113.6 kB / 0.5806 GB, free: 29.25 MB / 430.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002881/0.5058, allocations: 1.485 MB / 0.582 GB, free: 28.69 MB / 430.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.281e-05/0.5059, allocations: 0 / 0.582 GB, free: 28.69 MB / 430.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.000122/0.506, allocations: 42.41 kB / 0.5821 GB, free: 28.66 MB / 430.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.606e-05/0.506, allocations: 22.44 kB / 0.5821 GB, free: 28.66 MB / 430.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003378/0.5094, allocations: 1.442 MB / 0.5835 GB, free: 28.2 MB / 430.1 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 0.009087/0.5185, allocations: 4.96 MB / 0.5883 GB, free: 25.39 MB / 430.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.008525/0.5271, allocations: 3.015 MB / 0.5913 GB, free: 24.2 MB / 430.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.002488/0.5296, allocations: 0.9747 MB / 0.5922 GB, free: 23.82 MB / 430.1 MB Notification: Performance of preOpt evalFunc (simulation): time 0.0001421/0.5297, allocations: 24.44 kB / 0.5922 GB, free: 23.81 MB / 430.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.473e-05/0.5298, allocations: 50.66 kB / 0.5923 GB, free: 23.76 MB / 430.1 MB Notification: Performance of pre-optimization done (n=128): time 3.327e-06/0.5298, allocations: 0 / 0.5923 GB, free: 23.76 MB / 430.1 MB Notification: Performance of matching and sorting (n=128): time 0.04424/0.574, allocations: 10.01 MB / 0.6021 GB, free: 21.99 MB / 430.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 6.537e-05/0.5741, allocations: 146 kB / 0.6022 GB, free: 21.83 MB / 430.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002588/0.5767, allocations: 1.44 MB / 0.6036 GB, free: 21.26 MB / 430.1 MB Notification: Performance of collectPreVariables (initialization): time 0.0004504/0.5772, allocations: 51.92 kB / 0.6037 GB, free: 21.21 MB / 430.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.0004235/0.5776, allocations: 0.6077 MB / 0.6043 GB, free: 20.73 MB / 430.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0005421/0.5782, allocations: 479 kB / 0.6047 GB, free: 20.33 MB / 430.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0006538/0.5788, allocations: 348.8 kB / 0.6051 GB, free: 20.13 MB / 430.1 MB Notification: Performance of setup shared object (initialization): time 4.129e-05/0.5789, allocations: 302.2 kB / 0.6053 GB, free: 19.83 MB / 430.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.002307/0.5812, allocations: 1.039 MB / 0.6064 GB, free: 19.31 MB / 430.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.002437/0.5837, allocations: 1.239 MB / 0.6076 GB, free: 18.6 MB / 430.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.004607/0.5883, allocations: 2.198 MB / 0.6097 GB, free: 17.4 MB / 430.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 9.868e-06/0.5883, allocations: 1.281 kB / 0.6097 GB, free: 17.4 MB / 430.1 MB Notification: Performance of matching and sorting (n=244) (initialization): time 0.01/0.5983, allocations: 3.902 MB / 0.6135 GB, free: 15.47 MB / 430.1 MB Notification: Performance of prepare postOptimizeDAE: time 2.639e-05/0.5984, allocations: 9.859 kB / 0.6135 GB, free: 15.47 MB / 430.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.637e-05/0.5984, allocations: 7.875 kB / 0.6135 GB, free: 15.46 MB / 430.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.009818/0.6082, allocations: 3.058 MB / 0.6165 GB, free: 13.05 MB / 430.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001559/0.6098, allocations: 292.4 kB / 0.6168 GB, free: 12.77 MB / 430.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.007632/0.6175, allocations: 3.235 MB / 0.62 GB, free: 9.504 MB / 430.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002609/0.6201, allocations: 262.3 kB / 0.6202 GB, free: 9.246 MB / 430.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001712/0.6203, allocations: 63.98 kB / 0.6203 GB, free: 9.184 MB / 430.1 MB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.002485/0.6228, allocations: 1.244 MB / 0.6215 GB, free: 7.938 MB / 430.1 MB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.002112/0.6249, allocations: 1.227 MB / 0.6227 GB, free: 6.664 MB / 430.1 MB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.003973/0.6289, allocations: 2.179 MB / 0.6248 GB, free: 4.441 MB / 430.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.809e-06/0.6289, allocations: 0 / 0.6248 GB, free: 4.441 MB / 430.1 MB Notification: Performance of matching and sorting (n=244) (initialization_lambda0): time 0.008895/0.6378, allocations: 3.871 MB / 0.6286 GB, free: 0.5586 MB / 430.1 MB Notification: Performance of prepare postOptimizeDAE: time 1.582e-05/0.6378, allocations: 4 kB / 0.6286 GB, free: 0.5547 MB / 430.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.315e-06/0.6379, allocations: 8 kB / 0.6286 GB, free: 0.5469 MB / 430.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.01006/0.6479, allocations: 3.051 MB / 0.6316 GB, free: 13.49 MB / 446.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001445/0.6494, allocations: 295.6 kB / 0.6319 GB, free: 13.2 MB / 446.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.008471/0.6579, allocations: 3.191 MB / 0.635 GB, free: 9.984 MB / 446.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002844/0.6608, allocations: 246.5 kB / 0.6352 GB, free: 9.742 MB / 446.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000308/0.6611, allocations: 63.98 kB / 0.6353 GB, free: 9.68 MB / 446.1 MB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 15 * 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 (171): * Single equations (assignments): 170 * 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 {(34,40)} Notification: Performance of prepare postOptimizeDAE: time 0.0005576/0.6617, allocations: 267.8 kB / 0.6355 GB, free: 9.41 MB / 446.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0006252/0.6623, allocations: 165.9 kB / 0.6357 GB, free: 9.246 MB / 446.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0174/0.6797, allocations: 4.982 MB / 0.6406 GB, free: 4.234 MB / 446.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 3.121e-05/0.6798, allocations: 19.98 kB / 0.6406 GB, free: 4.215 MB / 446.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.715e-05/0.6798, allocations: 4.812 kB / 0.6406 GB, free: 4.211 MB / 446.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 5.425e-05/0.6799, allocations: 3.984 kB / 0.6406 GB, free: 4.207 MB / 446.1 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 postOpt removeSimpleEquations (simulation): time 0.02417/0.704, allocations: 7.259 MB / 0.6477 GB, free: 12.8 MB / 462.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.249e-05/0.7041, allocations: 5.203 kB / 0.6477 GB, free: 12.8 MB / 462.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002695/0.7068, allocations: 447.5 kB / 0.6481 GB, free: 12.36 MB / 462.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 0.008414/0.7152, allocations: 2.255 MB / 0.6503 GB, free: 10.11 MB / 462.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0003857/0.7157, allocations: 25.19 kB / 0.6503 GB, free: 10.08 MB / 462.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.03297/0.7486, allocations: 14.09 MB / 0.6641 GB, free: 11.58 MB / 478.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.775e-06/0.7487, allocations: 4.094 kB / 0.6641 GB, free: 11.57 MB / 478.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.02098/0.7697, allocations: 6.31 MB / 0.6703 GB, free: 5.23 MB / 478.1 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0007846/0.7705, allocations: 276 kB / 0.6705 GB, free: 4.941 MB / 478.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0006694/0.7712, allocations: 28.69 kB / 0.6705 GB, free: 4.914 MB / 478.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002291/0.7735, allocations: 143.8 kB / 0.6707 GB, free: 4.773 MB / 478.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.001105/0.7746, allocations: 265.3 kB / 0.6709 GB, free: 4.516 MB / 478.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0002747/0.7749, allocations: 39.98 kB / 0.671 GB, free: 4.477 MB / 478.1 MB Notification: Performance of sorting global known variables: time 0.002609/0.7775, allocations: 0.9746 MB / 0.6719 GB, free: 3.504 MB / 478.1 MB Notification: Performance of sort global known variables: time 2.01e-07/0.7776, allocations: 0.75 kB / 0.6719 GB, free: 3.504 MB / 478.1 MB Notification: Performance of remove unused functions: time 0.004766/0.7823, allocations: 0.8777 MB / 0.6728 GB, free: 2.625 MB / 478.1 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 3 * Number of states: 13 (gENCLS.delta,gENCLS.eq,gENROE.w,gENROE.delta,gENROE.Epd,gENROE.Epq,gENROE.PSIkd,gENROE.PSIkq,eXST1.imLeadLag.TF.x_scaled[1],eXST1.Vm1.state,eXST1.imDerivativeLag.x,eXST1.TransducerDelay.state,gENCLS.omega) * 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 (79): * Single equations (assignments): 76 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 1 * Torn equation systems: 2 * 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): 1 system {1} * Without analytic Jacobian (size): 0 systems 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): 2 systems {(1,6), (26,23)} Notification: Performance of Backend phase and start with SimCode phase: time 0.0005071/0.7828, allocations: 143.2 kB / 0.6729 GB, free: 2.473 MB / 478.1 MB Notification: Performance of simCode: created initialization part: time 0.02047/0.8033, allocations: 5.422 MB / 0.6782 GB, free: 13.06 MB / 494.1 MB Notification: Performance of simCode: created event and clocks part: time 8.046e-06/0.8034, allocations: 0 / 0.6782 GB, free: 13.06 MB / 494.1 MB Notification: Performance of simCode: created simulation system equations: time 0.009082/0.8125, allocations: 2.406 MB / 0.6806 GB, free: 10.64 MB / 494.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002591/0.8151, allocations: 152.3 kB / 0.6807 GB, free: 10.49 MB / 494.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.007634/0.8228, allocations: 3.22 MB / 0.6839 GB, free: 7.312 MB / 494.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001003/0.8238, allocations: 1.238 MB / 0.6851 GB, free: 6.047 MB / 494.1 MB Notification: Performance of simCode: alias equations: time 0.001056/0.8249, allocations: 169.7 kB / 0.6852 GB, free: 5.887 MB / 494.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000432/0.8253, allocations: 99.41 kB / 0.6853 GB, free: 5.789 MB / 494.1 MB Notification: Performance of SimCode: time 4.01e-07/0.8253, allocations: 0 / 0.6853 GB, free: 5.789 MB / 494.1 MB Notification: Performance of Templates: time 0.07987/0.9052, allocations: 38.6 MB / 0.723 GB, free: 15.33 MB / 0.5294 GB make -j1 -f OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.makefile (rm -f OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.pipe ; mkfifo OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.pipe ; head -c 1048576 < OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.pipe >> ../files/OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.sim & ./OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1 -abortSlowSimulation -alarm=480 -lv LOG_STATS > OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.pipe 2>&1)