Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.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 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo) Running command: translateModel(Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem") translateModel(Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.326/1.326, allocations: 252 MB / 267.6 MB, free: 10.89 MB / 218.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001408/0.001408, allocations: 185.1 kB / 327.3 MB, free: 2.18 MB / 250.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.77/1.77, allocations: 205.4 MB / 0.5783 GB, free: 20.18 MB / 426.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0009465/0.0009465, allocations: 78.42 kB / 0.6829 GB, free: 12.86 MB / 0.5105 GB Notification: Performance of FrontEnd - loaded program: time 0.0004256/0.000426, allocations: 9.781 kB / 0.797 GB, free: 135 MB / 0.6042 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2521/0.2526, allocations: 106.4 MB / 0.9008 GB, free: 63.84 MB / 0.6042 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem): time 0.8953/1.148, allocations: 328.2 MB / 1.221 GB, free: 10.24 MB / 0.7448 GB Notification: Performance of NFInst.instExpressions: time 0.05957/1.208, allocations: 35.95 MB / 1.256 GB, free: 6.227 MB / 0.7761 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.009856/1.218, allocations: 154.9 kB / 1.257 GB, free: 6.074 MB / 0.7761 GB Notification: Performance of NFTyping.typeComponents: time 0.008282/1.226, allocations: 1.844 MB / 1.258 GB, free: 4.219 MB / 0.7761 GB Notification: Performance of NFTyping.typeBindings: time 0.026/1.252, allocations: 6.315 MB / 1.265 GB, free: 13.88 MB / 0.7917 GB Notification: Performance of NFTyping.typeClassSections: time 0.01453/1.266, allocations: 3.607 MB / 1.268 GB, free: 10.3 MB / 0.7917 GB Notification: Performance of NFFlatten.flatten: time 0.02248/1.289, allocations: 13.98 MB / 1.282 GB, free: 12.29 MB / 0.8073 GB Notification: Performance of NFFlatten.resolveConnections: time 0.008743/1.298, allocations: 3.343 MB / 1.285 GB, free: 8.891 MB / 0.8073 GB Notification: Performance of NFEvalConstants.evaluate: time 0.01464/1.312, allocations: 4.696 MB / 1.29 GB, free: 4.176 MB / 0.8073 GB Notification: Performance of NFSimplifyModel.simplify: time 0.009185/1.322, allocations: 3.763 MB / 1.293 GB, free: 408 kB / 0.8073 GB Notification: Performance of NFPackage.collectConstants: time 0.002412/1.324, allocations: 212 kB / 1.293 GB, free: 196 kB / 0.8073 GB Notification: Performance of NFFlatten.collectFunctions: time 0.0147/1.339, allocations: 3.695 MB / 1.297 GB, free: 12.49 MB / 0.823 GB Notification: Performance of NFScalarize.scalarize: time 0.004943/1.344, allocations: 1.581 MB / 1.299 GB, free: 10.9 MB / 0.823 GB Notification: Performance of NFVerifyModel.verify: time 0.004172/1.348, allocations: 1.003 MB / 1.3 GB, free: 9.891 MB / 0.823 GB Notification: Performance of NFConvertDAE.convert: time 0.01426/1.362, allocations: 6.469 MB / 1.306 GB, free: 3.406 MB / 0.823 GB Notification: Performance of FrontEnd - DAE generated: time 7.113e-06/1.362, allocations: 0 / 1.306 GB, free: 3.406 MB / 0.823 GB Notification: Performance of FrontEnd: time 4.048e-06/1.362, allocations: 0 / 1.306 GB, free: 3.406 MB / 0.823 GB Notification: Performance of Transformations before backend: time 0.0003919/1.363, allocations: 0 / 1.306 GB, free: 3.406 MB / 0.823 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 719 * Number of variables: 719 Notification: Performance of Generate backend data structure: time 0.01656/1.379, allocations: 5.089 MB / 1.311 GB, free: 14.24 MB / 0.8386 GB Notification: Performance of prepare preOptimizeDAE: time 5.314e-05/1.379, allocations: 8.031 kB / 1.311 GB, free: 14.23 MB / 0.8386 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01005/1.39, allocations: 1.457 MB / 1.312 GB, free: 12.77 MB / 0.8386 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.01131/1.401, allocations: 3.455 MB / 1.316 GB, free: 9.234 MB / 0.8386 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0009417/1.402, allocations: 366.5 kB / 1.316 GB, free: 8.875 MB / 0.8386 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.001176/1.403, allocations: 312 kB / 1.316 GB, free: 8.57 MB / 0.8386 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.01054/1.414, allocations: 3.521 MB / 1.32 GB, free: 4.926 MB / 0.8386 GB Notification: Performance of preOpt findStateOrder (simulation): time 0.0001234/1.414, allocations: 3.938 kB / 1.32 GB, free: 4.922 MB / 0.8386 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0007848/1.415, allocations: 116 kB / 1.32 GB, free: 4.809 MB / 0.8386 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.000137/1.415, allocations: 109.4 kB / 1.32 GB, free: 4.699 MB / 0.8386 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.009372/1.424, allocations: 2.96 MB / 1.323 GB, free: 1.727 MB / 0.8386 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 0.03233/1.457, allocations: 15.41 MB / 1.338 GB, free: 1.371 MB / 0.8542 GB Notification: Performance of preOpt comSubExp (simulation): time 0.005011/1.462, allocations: 2.061 MB / 1.34 GB, free: 15.3 MB / 0.8698 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.002801/1.464, allocations: 1.218 MB / 1.341 GB, free: 14.08 MB / 0.8698 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0004909/1.465, allocations: 236.1 kB / 1.341 GB, free: 13.82 MB / 0.8698 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 8.242e-05/1.465, allocations: 64.55 kB / 1.341 GB, free: 13.74 MB / 0.8698 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.003435/1.469, allocations: 497.7 kB / 1.342 GB, free: 13.25 MB / 0.8698 GB Notification: Performance of pre-optimization done (n=187): time 1.339e-05/1.469, allocations: 0 / 1.342 GB, free: 13.25 MB / 0.8698 GB Notification: Performance of matching and sorting (n=195): time 0.02218/1.491, allocations: 7.283 MB / 1.349 GB, free: 5.859 MB / 0.8698 GB Notification: Performance of inlineWhenForInitialization (initialization): time 6.023e-05/1.491, allocations: 81.36 kB / 1.349 GB, free: 5.77 MB / 0.8698 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.009089/1.5, allocations: 3.877 MB / 1.353 GB, free: 1.883 MB / 0.8698 GB Notification: Performance of collectPreVariables (initialization): time 0.0007162/1.501, allocations: 81.7 kB / 1.353 GB, free: 1.797 MB / 0.8698 GB Notification: Performance of collectInitialEqns (initialization): time 0.002311/1.503, allocations: 1.983 MB / 1.355 GB, free: 15.8 MB / 0.8855 GB Notification: Performance of collectInitialBindings (initialization): time 0.001204/1.504, allocations: 0.6699 MB / 1.356 GB, free: 15.12 MB / 0.8855 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003951/1.505, allocations: 48 kB / 1.356 GB, free: 15.07 MB / 0.8855 GB Notification: Performance of setup shared object (initialization): time 0.0003105/1.505, allocations: 398.3 kB / 1.356 GB, free: 14.68 MB / 0.8855 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.003273/1.508, allocations: 0.9842 MB / 1.357 GB, free: 13.69 MB / 0.8855 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.003976/1.512, allocations: 1.95 MB / 1.359 GB, free: 11.32 MB / 0.8855 GB Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: zone4.dynBal.medium.p = zone4.dynBal.p_start (sin.p = zone4.dynBal.p_start) Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: zone3.dynBal.medium.p = zone3.dynBal.p_start (sin.p = zone3.dynBal.p_start) Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: zone1.dynBal.medium.p = zone1.dynBal.p_start (sin.p = zone1.dynBal.p_start) Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: zone2.dynBal.medium.p = zone2.dynBal.p_start (sin.p = zone2.dynBal.p_start) Notification: Performance of analyzeInitialSystem (initialization): time 0.0346/1.547, allocations: 8.71 MB / 1.367 GB, free: 2.559 MB / 0.8855 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.888e-05/1.547, allocations: 8 kB / 1.367 GB, free: 2.551 MB / 0.8855 GB Notification: Performance of matching and sorting (n=284) (initialization): time 0.009533/1.557, allocations: 3.345 MB / 1.371 GB, free: 15.19 MB / 0.9011 GB Notification: Performance of prepare postOptimizeDAE: time 0.000653/1.557, allocations: 0.5998 MB / 1.371 GB, free: 14.36 MB / 0.9011 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.098e-05/1.557, allocations: 16 kB / 1.371 GB, free: 14.34 MB / 0.9011 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001479/1.559, allocations: 302.1 kB / 1.371 GB, free: 14.04 MB / 0.9011 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002678/1.561, allocations: 0.5461 MB / 1.372 GB, free: 13.49 MB / 0.9011 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001732/1.563, allocations: 1.821 MB / 1.374 GB, free: 11.59 MB / 0.9011 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.005754/1.569, allocations: 402 kB / 1.374 GB, free: 11.21 MB / 0.9011 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0005251/1.57, allocations: 112 kB / 1.374 GB, free: 11.1 MB / 0.9011 GB Notification: Performance of prepare postOptimizeDAE: time 1.823e-05/1.57, allocations: 4 kB / 1.374 GB, free: 11.09 MB / 0.9011 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.00692/1.577, allocations: 2.732 MB / 1.377 GB, free: 8.352 MB / 0.9011 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.993e-05/1.577, allocations: 20 kB / 1.377 GB, free: 8.332 MB / 0.9011 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0007351/1.577, allocations: 198.7 kB / 1.377 GB, free: 8.129 MB / 0.9011 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002378/1.58, allocations: 0.5148 MB / 1.378 GB, free: 7.613 MB / 0.9011 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.005135/1.585, allocations: 4.929 MB / 1.382 GB, free: 2.246 MB / 0.9011 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.005935/1.591, allocations: 378.9 kB / 1.383 GB, free: 1.879 MB / 0.9011 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0005561/1.592, allocations: 104 kB / 1.383 GB, free: 1.777 MB / 0.9011 GB Warning: The initial conditions are over specified. The following 4 initial equations are redundant, so they are removed from the initialization sytem: zone4.dynBal.medium.p = zone4.dynBal.p_start zone3.dynBal.medium.p = zone3.dynBal.p_start zone1.dynBal.medium.p = zone1.dynBal.p_start zone2.dynBal.medium.p = zone2.dynBal.p_start. Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 76 * 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 (266): * Single equations (assignments): 261 * Array equations: 2 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 3 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 3 {2 9,1 3,1 3} Notification: Performance of prepare postOptimizeDAE: time 0.003256/1.595, allocations: 0.985 MB / 1.384 GB, free: 0.7812 MB / 0.9011 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.001755/1.597, allocations: 422.7 kB / 1.384 GB, free: 372 kB / 0.9011 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.008231/1.605, allocations: 2.889 MB / 1.387 GB, free: 13.45 MB / 0.9167 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.991e-05/1.605, allocations: 16 kB / 1.387 GB, free: 13.43 MB / 0.9167 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.361e-05/1.605, allocations: 4 kB / 1.387 GB, free: 13.43 MB / 0.9167 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.005354/1.61, allocations: 2.413 MB / 1.39 GB, free: 10.96 MB / 0.9167 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 0.01745/1.628, allocations: 6.857 MB / 1.396 GB, free: 3.898 MB / 0.9167 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.462e-05/1.628, allocations: 9 kB / 1.396 GB, free: 3.891 MB / 0.9167 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.002199/1.63, allocations: 479.3 kB / 1.397 GB, free: 3.422 MB / 0.9167 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0004493/1.63, allocations: 186.4 kB / 1.397 GB, free: 3.23 MB / 0.9167 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001415/1.631, allocations: 59.92 kB / 1.397 GB, free: 3.172 MB / 0.9167 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001204/1.632, allocations: 1.774 MB / 1.399 GB, free: 1.32 MB / 0.9167 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.069e-05/1.632, allocations: 19.88 kB / 1.399 GB, free: 1.301 MB / 0.9167 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.5761/2.208, allocations: 4.409 MB / 1.403 GB, free: 353.7 MB / 0.9167 GB Notification: Performance of postOpt removeConstants (simulation): time 0.002668/2.211, allocations: 0.758 MB / 1.404 GB, free: 353.6 MB / 0.9167 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.001071/2.212, allocations: 49.66 kB / 1.404 GB, free: 353.6 MB / 0.9167 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.004558/2.216, allocations: 334.7 kB / 1.404 GB, free: 353.6 MB / 0.9167 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0003615/2.217, allocations: 149.6 kB / 1.404 GB, free: 353.6 MB / 0.9167 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0002302/2.217, allocations: 88.22 kB / 1.404 GB, free: 353.6 MB / 0.9167 GB Notification: Performance of sorting global known variables: time 0.00573/2.223, allocations: 2.662 MB / 1.407 GB, free: 353.4 MB / 0.9167 GB Notification: Performance of sort global known variables: time 4.61e-07/2.223, allocations: 3.969 kB / 1.407 GB, free: 353.4 MB / 0.9167 GB Notification: Performance of remove unused functions: time 0.009324/2.232, allocations: 1.829 MB / 1.409 GB, free: 353.4 MB / 0.9167 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 39 * Number of states: 8 (zone2.dynBal.U,zone2.dynBal.mXi[1],zone1.dynBal.U,zone1.dynBal.mXi[1],zone3.dynBal.U,zone3.dynBal.mXi[1],zone4.dynBal.U,zone4.dynBal.mXi[1]) * 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 (189): * Single equations (assignments): 186 * 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: 3 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 3 {2 9,1 3,1 3} Notification: Performance of Backend phase and start with SimCode phase: time 0.001675/2.234, allocations: 0.5256 MB / 1.409 GB, free: 353.3 MB / 0.9167 GB Notification: Performance of simCode: created initialization part: time 0.01125/2.245, allocations: 4.283 MB / 1.413 GB, free: 352.8 MB / 0.9167 GB Notification: Performance of simCode: created event and clocks part: time 2.155e-05/2.245, allocations: 3.656 kB / 1.413 GB, free: 352.8 MB / 0.9167 GB Notification: Performance of simCode: created simulation system equations: time 0.003208/2.248, allocations: 1.246 MB / 1.415 GB, free: 352.8 MB / 0.9167 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.01453/2.263, allocations: 2.305 MB / 1.417 GB, free: 352.7 MB / 0.9167 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01802/2.281, allocations: 9.279 MB / 1.426 GB, free: 348.7 MB / 0.9167 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002122/2.283, allocations: 2.529 MB / 1.428 GB, free: 347.9 MB / 0.9167 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.002006/2.285, allocations: 337.2 kB / 1.429 GB, free: 347.9 MB / 0.9167 GB Notification: Performance of SimCode: time 9.42e-07/2.285, allocations: 0 / 1.429 GB, free: 347.9 MB / 0.9167 GB Notification: Performance of Templates: time 0.1942/2.479, allocations: 123.6 MB / 1.549 GB, free: 235 MB / 0.9167 GB make -j1 -f Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.makefile (rm -f Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.sim & ./Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_maint.7.0.x_Buildings.Fluid.Movers.Validation.FlowControlled_dpSystem.pipe 2>&1)