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 0.001052/0.001052, allocations: 105.5 kB / 16.29 MB, free: 6.027 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.291/1.291, allocations: 222.9 MB / 239.9 MB, free: 4.688 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001248/0.001248, allocations: 196.4 kB / 290.2 MB, free: 2.391 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 3.0.1/package.mo): time 0.4227/0.4227, allocations: 78.53 MB / 418.9 MB, free: 3.258 MB / 286.1 MB Notification: Performance of FrontEnd - loaded program: time 0.002001/0.002001, allocations: 79.89 kB / 498.2 MB, free: 6.445 MB / 366.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1357/0.1378, allocations: 68.18 MB / 0.5531 GB, free: 2.23 MB / 430.1 MB Notification: Performance of NFInst.instantiate(OpenIPSL.Tests.Controls.PSSE.ES.EXST1): time 0.1893/0.3271, allocations: 8.337 MB / 0.5612 GB, free: 35.21 MB / 430.1 MB Notification: Performance of NFInst.instExpressions: time 0.004497/0.3316, allocations: 2.655 MB / 0.5638 GB, free: 34.51 MB / 430.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.001213/0.3328, allocations: 14.97 kB / 0.5638 GB, free: 34.51 MB / 430.1 MB Notification: Performance of NFTyping.typeComponents: time 0.001012/0.3339, allocations: 320.3 kB / 0.5641 GB, free: 34.5 MB / 430.1 MB Notification: Performance of NFTyping.typeBindings: time 0.002994/0.3369, allocations: 1.212 MB / 0.5653 GB, free: 34.12 MB / 430.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.0016/0.3385, allocations: 0.7527 MB / 0.566 GB, free: 34.05 MB / 430.1 MB Notification: Performance of NFFlatten.flatten: time 0.002324/0.3409, allocations: 2.414 MB / 0.5684 GB, free: 33.59 MB / 430.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.0004899/0.3414, allocations: 413.7 kB / 0.5688 GB, free: 33.51 MB / 430.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.0008125/0.3422, allocations: 0.9235 MB / 0.5697 GB, free: 33.29 MB / 430.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.0008945/0.3431, allocations: 1.155 MB / 0.5708 GB, free: 33.01 MB / 430.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0002179/0.3433, allocations: 185.3 kB / 0.571 GB, free: 33.01 MB / 430.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.0005583/0.3439, allocations: 370.1 kB / 0.5713 GB, free: 33 MB / 430.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0002773/0.3442, allocations: 480.6 kB / 0.5718 GB, free: 32.89 MB / 430.1 MB Notification: Performance of NFVerifyModel.verify: time 0.0005445/0.3447, allocations: 0.9323 MB / 0.5727 GB, free: 32.57 MB / 430.1 MB Notification: Performance of NFConvertDAE.convert: time 0.001574/0.3463, allocations: 2.334 MB / 0.575 GB, free: 32.06 MB / 430.1 MB Notification: Performance of FrontEnd - DAE generated: time 4.548e-06/0.3463, allocations: 0 / 0.575 GB, free: 32.06 MB / 430.1 MB Notification: Performance of FrontEnd: time 2.104e-06/0.3463, allocations: 0 / 0.575 GB, free: 32.06 MB / 430.1 MB Notification: Performance of Transformations before backend: time 2.1e-05/0.3463, allocations: 3.938 kB / 0.575 GB, free: 32.05 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 0.01341/0.3598, allocations: 3.944 MB / 0.5788 GB, free: 30.81 MB / 430.1 MB Notification: Performance of prepare preOptimizeDAE: time 3.856e-05/0.3598, allocations: 10.62 kB / 0.5789 GB, free: 30.81 MB / 430.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004512/0.3643, allocations: 0.7506 MB / 0.5796 GB, free: 30.64 MB / 430.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001935/0.3663, allocations: 1.141 MB / 0.5807 GB, free: 29.91 MB / 430.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0004663/0.3668, allocations: 0.4886 MB / 0.5812 GB, free: 29.46 MB / 430.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002481/0.367, allocations: 121.7 kB / 0.5813 GB, free: 29.41 MB / 430.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002725/0.3698, allocations: 1.481 MB / 0.5827 GB, free: 28.86 MB / 430.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.475e-05/0.3698, allocations: 0 / 0.5827 GB, free: 28.86 MB / 430.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.00012/0.3699, allocations: 42.14 kB / 0.5828 GB, free: 28.83 MB / 430.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.838e-05/0.37, allocations: 24.34 kB / 0.5828 GB, free: 28.83 MB / 430.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003189/0.3732, allocations: 1.443 MB / 0.5842 GB, free: 28.37 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 0.01234/0.3855, allocations: 4.944 MB / 0.589 GB, free: 25.57 MB / 430.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.01295/0.3985, allocations: 3.006 MB / 0.592 GB, free: 24.38 MB / 430.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.003425/0.402, allocations: 0.9738 MB / 0.5929 GB, free: 24 MB / 430.1 MB Notification: Performance of preOpt evalFunc (simulation): time 0.0001872/0.4022, allocations: 22.59 kB / 0.593 GB, free: 23.99 MB / 430.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.812e-05/0.4022, allocations: 57.97 kB / 0.593 GB, free: 23.93 MB / 430.1 MB Notification: Performance of pre-optimization done (n=128): time 5.02e-06/0.4023, allocations: 0 / 0.593 GB, free: 23.93 MB / 430.1 MB Notification: Performance of matching and sorting (n=128): time 0.0606/0.4629, allocations: 10 MB / 0.6028 GB, free: 22.18 MB / 430.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 7.195e-05/0.463, allocations: 144 kB / 0.6029 GB, free: 22.02 MB / 430.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003006/0.466, allocations: 1.442 MB / 0.6043 GB, free: 21.45 MB / 430.1 MB Notification: Performance of collectPreVariables (initialization): time 0.0003871/0.4664, allocations: 52.89 kB / 0.6044 GB, free: 21.39 MB / 430.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.0005191/0.4669, allocations: 0.6149 MB / 0.605 GB, free: 20.91 MB / 430.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0005546/0.4675, allocations: 473.4 kB / 0.6054 GB, free: 20.5 MB / 430.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0008515/0.4684, allocations: 345.2 kB / 0.6058 GB, free: 20.3 MB / 430.1 MB Notification: Performance of setup shared object (initialization): time 3.65e-05/0.4684, allocations: 302.3 kB / 0.606 GB, free: 20 MB / 430.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.003393/0.4718, allocations: 1.043 MB / 0.6071 GB, free: 19.48 MB / 430.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.003736/0.4756, allocations: 1.24 MB / 0.6083 GB, free: 18.77 MB / 430.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.007141/0.4827, allocations: 2.194 MB / 0.6104 GB, free: 17.57 MB / 430.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.416e-05/0.4828, allocations: 1.062 kB / 0.6104 GB, free: 17.57 MB / 430.1 MB Notification: Performance of matching and sorting (n=244) (initialization): time 0.01549/0.4983, allocations: 3.91 MB / 0.6142 GB, free: 15.64 MB / 430.1 MB Notification: Performance of prepare postOptimizeDAE: time 3.063e-05/0.4983, allocations: 10.78 kB / 0.6142 GB, free: 15.63 MB / 430.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.206e-05/0.4984, allocations: 3.938 kB / 0.6142 GB, free: 15.63 MB / 430.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.0145/0.5129, allocations: 3.047 MB / 0.6172 GB, free: 13.1 MB / 430.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002172/0.5151, allocations: 309.7 kB / 0.6175 GB, free: 12.8 MB / 430.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.008696/0.5238, allocations: 3.22 MB / 0.6207 GB, free: 9.555 MB / 430.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002548/0.5264, allocations: 275.3 kB / 0.6209 GB, free: 9.285 MB / 430.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002629/0.5267, allocations: 63.98 kB / 0.621 GB, free: 9.223 MB / 430.1 MB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.002612/0.5293, allocations: 1.242 MB / 0.6222 GB, free: 7.977 MB / 430.1 MB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.002204/0.5315, allocations: 1.23 MB / 0.6234 GB, free: 6.699 MB / 430.1 MB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.004009/0.5355, allocations: 2.168 MB / 0.6255 GB, free: 4.488 MB / 430.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.57e-06/0.5355, allocations: 0 / 0.6255 GB, free: 4.488 MB / 430.1 MB Notification: Performance of matching and sorting (n=244) (initialization_lambda0): time 0.008969/0.5445, allocations: 3.879 MB / 0.6293 GB, free: 0.5977 MB / 430.1 MB Notification: Performance of prepare postOptimizeDAE: time 1.452e-05/0.5446, allocations: 8 kB / 0.6293 GB, free: 0.5898 MB / 430.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.457e-06/0.5446, allocations: 4 kB / 0.6293 GB, free: 0.5859 MB / 430.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.01009/0.5547, allocations: 3.034 MB / 0.6323 GB, free: 13.55 MB / 446.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001431/0.5561, allocations: 299.6 kB / 0.6326 GB, free: 13.25 MB / 446.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.007952/0.5641, allocations: 3.191 MB / 0.6357 GB, free: 10.04 MB / 446.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002378/0.5665, allocations: 243 kB / 0.6359 GB, free: 9.797 MB / 446.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002302/0.5667, allocations: 59.98 kB / 0.636 GB, free: 9.738 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 0.0004237/0.5672, allocations: 267.9 kB / 0.6362 GB, free: 9.469 MB / 446.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0004596/0.5676, allocations: 165.9 kB / 0.6364 GB, free: 9.305 MB / 446.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0166/0.5842, allocations: 4.994 MB / 0.6413 GB, free: 4.281 MB / 446.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.693e-05/0.5843, allocations: 12 kB / 0.6413 GB, free: 4.27 MB / 446.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 9.407e-06/0.5843, allocations: 4 kB / 0.6413 GB, free: 4.266 MB / 446.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.928e-05/0.5843, allocations: 7.969 kB / 0.6413 GB, free: 4.258 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 0.02067/0.605, allocations: 7.259 MB / 0.6484 GB, free: 12.86 MB / 462.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.484e-05/0.6051, allocations: 2.719 kB / 0.6484 GB, free: 12.86 MB / 462.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002596/0.6077, allocations: 439.5 kB / 0.6488 GB, free: 12.43 MB / 462.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 0.007973/0.6157, allocations: 2.247 MB / 0.651 GB, free: 10.18 MB / 462.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0002588/0.616, allocations: 33.23 kB / 0.651 GB, free: 10.14 MB / 462.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.03018/0.6462, allocations: 14.08 MB / 0.6648 GB, free: 11.65 MB / 478.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.926e-06/0.6462, allocations: 0.7031 kB / 0.6648 GB, free: 11.65 MB / 478.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01938/0.6656, allocations: 6.306 MB / 0.6709 GB, free: 5.309 MB / 478.1 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0006121/0.6662, allocations: 286.7 kB / 0.6712 GB, free: 5.008 MB / 478.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000462/0.6667, allocations: 20 kB / 0.6712 GB, free: 4.988 MB / 478.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001911/0.6686, allocations: 145.6 kB / 0.6714 GB, free: 4.848 MB / 478.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0008747/0.6695, allocations: 265.4 kB / 0.6716 GB, free: 4.59 MB / 478.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001484/0.6697, allocations: 35.98 kB / 0.6716 GB, free: 4.555 MB / 478.1 MB Notification: Performance of sorting global known variables: time 0.001546/0.6712, allocations: 0.9785 MB / 0.6726 GB, free: 3.578 MB / 478.1 MB Notification: Performance of sort global known variables: time 3.81e-07/0.6712, allocations: 4 kB / 0.6726 GB, free: 3.574 MB / 478.1 MB Notification: Performance of remove unused functions: time 0.002501/0.6737, allocations: 0.8699 MB / 0.6735 GB, free: 2.703 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 0.0003427/0.6741, allocations: 151.3 kB / 0.6736 GB, free: 2.543 MB / 478.1 MB Notification: Performance of simCode: created initialization part: time 0.01722/0.6913, allocations: 5.374 MB / 0.6788 GB, free: 13.18 MB / 494.1 MB Notification: Performance of simCode: created event and clocks part: time 6.251e-06/0.6914, allocations: 0 / 0.6788 GB, free: 13.18 MB / 494.1 MB Notification: Performance of simCode: created simulation system equations: time 0.008065/0.6994, allocations: 2.403 MB / 0.6812 GB, free: 10.76 MB / 494.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001961/0.7015, allocations: 149 kB / 0.6813 GB, free: 10.61 MB / 494.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.005783/0.7073, allocations: 3.184 MB / 0.6844 GB, free: 7.469 MB / 494.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007037/0.708, allocations: 1.238 MB / 0.6857 GB, free: 6.203 MB / 494.1 MB Notification: Performance of simCode: alias equations: time 0.000716/0.7087, allocations: 177.2 kB / 0.6858 GB, free: 6.035 MB / 494.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003075/0.709, allocations: 95.41 kB / 0.6859 GB, free: 5.941 MB / 494.1 MB Notification: Performance of SimCode: time 4.81e-07/0.709, allocations: 0 / 0.6859 GB, free: 5.941 MB / 494.1 MB Notification: Performance of Templates: time 0.05766/0.7667, allocations: 38.58 MB / 0.7236 GB, free: 15.52 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 -s gbode -lv LOG_STATS > OpenIPSL_OpenIPSL.Tests.Controls.PSSE.ES.EXST1.pipe 2>&1)