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 0.006307/0.006307, allocations: 104.8 kB / 15.74 MB, free: 6.496 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.328/1.328, allocations: 222.9 MB / 239.4 MB, free: 4.527 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001362/0.001362, allocations: 192.5 kB / 289.7 MB, free: 2.246 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 3.0.1/package.mo): time 0.4433/0.4433, allocations: 78.53 MB / 418.4 MB, free: 3.168 MB / 286.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001445/0.001445, allocations: 79.88 kB / 0.5536 GB, free: 0.9219 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2909/0.2923, allocations: 68.17 MB / 0.6202 GB, free: 9.738 MB / 430.1 MB Notification: Performance of NFInst.instantiate(OpenIPSL.Tests.Controls.PSSE.ES.EXST1): time 0.006126/0.2985, allocations: 8.328 MB / 0.6283 GB, free: 1.855 MB / 430.1 MB Notification: Performance of NFInst.instExpressions: time 0.0042/0.3027, allocations: 2.662 MB / 0.6309 GB, free: 15.18 MB / 446.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.0006567/0.3034, allocations: 16 kB / 0.631 GB, free: 15.17 MB / 446.1 MB Notification: Performance of NFTyping.typeComponents: time 0.0007695/0.3042, allocations: 321.2 kB / 0.6313 GB, free: 14.85 MB / 446.1 MB Notification: Performance of NFTyping.typeBindings: time 0.002727/0.3069, allocations: 1.267 MB / 0.6325 GB, free: 13.59 MB / 446.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.00152/0.3085, allocations: 0.7598 MB / 0.6332 GB, free: 12.83 MB / 446.1 MB Notification: Performance of NFFlatten.flatten: time 0.002591/0.3111, allocations: 2.426 MB / 0.6356 GB, free: 10.4 MB / 446.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.0006039/0.3117, allocations: 424.5 kB / 0.636 GB, free: 9.961 MB / 446.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.001035/0.3127, allocations: 0.9183 MB / 0.6369 GB, free: 9.039 MB / 446.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.001172/0.3139, allocations: 1.163 MB / 0.638 GB, free: 7.867 MB / 446.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0002477/0.3142, allocations: 188 kB / 0.6382 GB, free: 7.684 MB / 446.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.0005844/0.3148, allocations: 367.8 kB / 0.6386 GB, free: 7.324 MB / 446.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0003966/0.3152, allocations: 478.2 kB / 0.639 GB, free: 6.855 MB / 446.1 MB Notification: Performance of NFVerifyModel.verify: time 0.0007674/0.3159, allocations: 0.9323 MB / 0.6399 GB, free: 5.918 MB / 446.1 MB Notification: Performance of NFConvertDAE.convert: time 0.002072/0.318, allocations: 2.33 MB / 0.6422 GB, free: 3.586 MB / 446.1 MB Notification: Performance of FrontEnd - DAE generated: time 5.1e-06/0.318, allocations: 7.938 kB / 0.6422 GB, free: 3.578 MB / 446.1 MB Notification: Performance of FrontEnd: time 1.243e-06/0.318, allocations: 0 / 0.6422 GB, free: 3.578 MB / 446.1 MB Notification: Performance of Transformations before backend: time 2.046e-05/0.3181, allocations: 0 / 0.6422 GB, free: 3.578 MB / 446.1 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 0.01358/0.3317, allocations: 3.938 MB / 0.6461 GB, free: 15.58 MB / 462.1 MB Notification: Performance of prepare preOptimizeDAE: time 3.38e-05/0.3317, allocations: 8.031 kB / 0.6461 GB, free: 15.57 MB / 462.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004444/0.3362, allocations: 0.751 MB / 0.6468 GB, free: 14.82 MB / 462.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001856/0.338, allocations: 1.152 MB / 0.6479 GB, free: 13.61 MB / 462.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0005728/0.3386, allocations: 0.4883 MB / 0.6484 GB, free: 13.04 MB / 462.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002107/0.3388, allocations: 111.9 kB / 0.6485 GB, free: 12.93 MB / 462.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002964/0.3418, allocations: 1.49 MB / 0.65 GB, free: 11.43 MB / 462.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.347e-05/0.3418, allocations: 0 / 0.65 GB, free: 11.43 MB / 462.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.000122/0.342, allocations: 44 kB / 0.65 GB, free: 11.38 MB / 462.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 2.178e-05/0.342, allocations: 24 kB / 0.65 GB, free: 11.36 MB / 462.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003321/0.3453, allocations: 1.444 MB / 0.6515 GB, free: 9.914 MB / 462.1 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 0.008425/0.3538, allocations: 4.947 MB / 0.6563 GB, free: 4.762 MB / 462.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.008229/0.362, allocations: 3.001 MB / 0.6592 GB, free: 1.625 MB / 462.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.002086/0.3641, allocations: 0.9698 MB / 0.6602 GB, free: 0.6445 MB / 462.1 MB Notification: Performance of preOpt evalFunc (simulation): time 0.0001478/0.3643, allocations: 28.94 kB / 0.6602 GB, free: 0.6172 MB / 462.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.617e-05/0.3643, allocations: 51.5 kB / 0.6602 GB, free: 0.5586 MB / 462.1 MB Notification: Performance of pre-optimization done (n=128): time 2.956e-06/0.3643, allocations: 4 kB / 0.6602 GB, free: 0.5547 MB / 462.1 MB Notification: Performance of matching and sorting (n=128): time 0.03977/0.4041, allocations: 10 MB / 0.67 GB, free: 6.488 MB / 478.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 8.93e-05/0.4042, allocations: 141.5 kB / 0.6701 GB, free: 6.32 MB / 478.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002141/0.4064, allocations: 1.44 MB / 0.6716 GB, free: 4.871 MB / 478.1 MB Notification: Performance of collectPreVariables (initialization): time 0.0001703/0.4066, allocations: 57.7 kB / 0.6716 GB, free: 4.809 MB / 478.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.000448/0.407, allocations: 0.6082 MB / 0.6722 GB, free: 4.195 MB / 478.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0004515/0.4075, allocations: 469.3 kB / 0.6726 GB, free: 3.73 MB / 478.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.000638/0.4081, allocations: 355.3 kB / 0.673 GB, free: 3.379 MB / 478.1 MB Notification: Performance of setup shared object (initialization): time 9.387e-05/0.4082, allocations: 301.1 kB / 0.6733 GB, free: 3.082 MB / 478.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.002335/0.4106, allocations: 1.039 MB / 0.6743 GB, free: 2.039 MB / 478.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.00247/0.413, allocations: 1.253 MB / 0.6755 GB, free: 0.7344 MB / 478.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.004593/0.4176, allocations: 2.187 MB / 0.6776 GB, free: 14.5 MB / 494.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.687e-06/0.4177, allocations: 0 / 0.6776 GB, free: 14.5 MB / 494.1 MB Notification: Performance of matching and sorting (n=244) (initialization): time 0.009846/0.4275, allocations: 3.91 MB / 0.6815 GB, free: 10.58 MB / 494.1 MB Notification: Performance of prepare postOptimizeDAE: time 2.32e-05/0.4276, allocations: 10.34 kB / 0.6815 GB, free: 10.57 MB / 494.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.324e-05/0.4276, allocations: 3.984 kB / 0.6815 GB, free: 10.57 MB / 494.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.01009/0.4377, allocations: 3.048 MB / 0.6845 GB, free: 7.52 MB / 494.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001348/0.439, allocations: 295.6 kB / 0.6847 GB, free: 7.23 MB / 494.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.008047/0.4471, allocations: 3.231 MB / 0.6879 GB, free: 3.973 MB / 494.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002252/0.4494, allocations: 262.3 kB / 0.6881 GB, free: 3.715 MB / 494.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001642/0.4496, allocations: 67.98 kB / 0.6882 GB, free: 3.648 MB / 494.1 MB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.002714/0.4523, allocations: 1.238 MB / 0.6894 GB, free: 2.406 MB / 494.1 MB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.002458/0.4547, allocations: 1.231 MB / 0.6906 GB, free: 1.125 MB / 494.1 MB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.004585/0.4593, allocations: 2.183 MB / 0.6928 GB, free: 14.89 MB / 0.4981 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.019e-06/0.4594, allocations: 0 / 0.6928 GB, free: 14.89 MB / 0.4981 GB Notification: Performance of matching and sorting (n=244) (initialization_lambda0): time 0.009851/0.4692, allocations: 3.871 MB / 0.6965 GB, free: 11.01 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 1.346e-05/0.4692, allocations: 4 kB / 0.6965 GB, free: 11 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.715e-06/0.4693, allocations: 4 kB / 0.6965 GB, free: 11 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.01008/0.4793, allocations: 3.048 MB / 0.6995 GB, free: 7.953 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001686/0.4811, allocations: 299.5 kB / 0.6998 GB, free: 7.66 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.008172/0.4893, allocations: 3.183 MB / 0.7029 GB, free: 4.453 MB / 0.4981 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002395/0.4917, allocations: 242.5 kB / 0.7031 GB, free: 4.215 MB / 0.4981 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000261/0.492, allocations: 63.98 kB / 0.7032 GB, free: 4.152 MB / 0.4981 GB 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 0.0004654/0.4924, allocations: 267.8 kB / 0.7035 GB, free: 3.883 MB / 0.4981 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.000513/0.4929, allocations: 161.9 kB / 0.7036 GB, free: 3.723 MB / 0.4981 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01608/0.509, allocations: 4.992 MB / 0.7085 GB, free: 14.71 MB / 0.5137 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.878e-05/0.5091, allocations: 12 kB / 0.7085 GB, free: 14.7 MB / 0.5137 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.016e-05/0.5091, allocations: 0 / 0.7085 GB, free: 14.7 MB / 0.5137 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.196e-05/0.5091, allocations: 7.969 kB / 0.7085 GB, free: 14.69 MB / 0.5137 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 postOpt removeSimpleEquations (simulation): time 0.01978/0.5289, allocations: 7.262 MB / 0.7156 GB, free: 7.281 MB / 0.5137 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.905e-06/0.5289, allocations: 0 / 0.7156 GB, free: 7.281 MB / 0.5137 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002337/0.5313, allocations: 447.5 kB / 0.716 GB, free: 6.844 MB / 0.5137 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.007425/0.5387, allocations: 2.244 MB / 0.7182 GB, free: 4.59 MB / 0.5137 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.000153/0.5389, allocations: 32 kB / 0.7182 GB, free: 4.559 MB / 0.5137 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.02944/0.5683, allocations: 14.06 MB / 0.732 GB, free: 6.062 MB / 0.5294 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.565e-06/0.5684, allocations: 8.125 kB / 0.732 GB, free: 6.055 MB / 0.5294 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01847/0.5869, allocations: 6.307 MB / 0.7381 GB, free: 15.71 MB / 0.545 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005986/0.5875, allocations: 274.7 kB / 0.7384 GB, free: 15.43 MB / 0.545 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002169/0.5877, allocations: 28 kB / 0.7384 GB, free: 15.4 MB / 0.545 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001545/0.5893, allocations: 147.8 kB / 0.7386 GB, free: 15.25 MB / 0.545 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0008264/0.5901, allocations: 261.4 kB / 0.7388 GB, free: 15 MB / 0.545 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.000105/0.5902, allocations: 39.92 kB / 0.7389 GB, free: 14.96 MB / 0.545 GB Notification: Performance of sorting global known variables: time 0.001432/0.5917, allocations: 0.9785 MB / 0.7398 GB, free: 13.98 MB / 0.545 GB Notification: Performance of sort global known variables: time 2e-07/0.5917, allocations: 0 / 0.7398 GB, free: 13.98 MB / 0.545 GB Notification: Performance of remove unused functions: time 0.00212/0.5938, allocations: 0.8818 MB / 0.7407 GB, free: 13.1 MB / 0.545 GB 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 0.0002933/0.5941, allocations: 147.8 kB / 0.7408 GB, free: 12.95 MB / 0.545 GB Notification: Performance of simCode: created initialization part: time 0.01657/0.6107, allocations: 5.372 MB / 0.7461 GB, free: 7.578 MB / 0.545 GB Notification: Performance of simCode: created event and clocks part: time 4.137e-06/0.6107, allocations: 4 kB / 0.7461 GB, free: 7.574 MB / 0.545 GB Notification: Performance of simCode: created simulation system equations: time 0.007615/0.6183, allocations: 2.402 MB / 0.7484 GB, free: 5.141 MB / 0.545 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001141/0.6195, allocations: 145.2 kB / 0.7486 GB, free: 4.996 MB / 0.545 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.005936/0.6254, allocations: 3.182 MB / 0.7517 GB, free: 1.781 MB / 0.545 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007723/0.6262, allocations: 1.242 MB / 0.7529 GB, free: 0.5117 MB / 0.545 GB Notification: Performance of simCode: alias equations: time 0.0007224/0.6269, allocations: 170.2 kB / 0.753 GB, free: 352 kB / 0.545 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003105/0.6273, allocations: 95.41 kB / 0.7531 GB, free: 256 kB / 0.545 GB Notification: Performance of SimCode: time 4.71e-07/0.6273, allocations: 3.938 kB / 0.7531 GB, free: 252 kB / 0.545 GB Notification: Performance of Templates: time 0.3163/0.9436, allocations: 38.96 MB / 0.7912 GB, free: 127.6 MB / 0.5606 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)