Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.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/Complex 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/IDEAS 3.0.0-master/package.mo", uses=false) Using package IDEAS with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-master/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 Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 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(IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume") translateModel(IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001371/0.001371, allocations: 109.5 kB / 16.41 MB, free: 6.453 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001323/0.001323, allocations: 189.7 kB / 17.34 MB, free: 5.719 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.44/1.44, allocations: 222.9 MB / 241 MB, free: 15.15 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-master/package.mo): time 0.8149/0.8149, allocations: 135.1 MB / 426.3 MB, free: 4.125 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001214/0.001214, allocations: 62.62 kB / 0.5863 GB, free: 21.7 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1638/0.165, allocations: 80.93 MB / 0.6653 GB, free: 5.793 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume): time 0.664/0.8291, allocations: 167.6 MB / 0.8289 GB, free: 15.89 MB / 0.6075 GB Notification: Performance of NFInst.instExpressions: time 0.01427/0.8434, allocations: 8.895 MB / 0.8376 GB, free: 8.645 MB / 0.6075 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00244/0.8459, allocations: 39.12 kB / 0.8377 GB, free: 8.633 MB / 0.6075 GB Notification: Performance of NFTyping.typeComponents: time 0.002042/0.848, allocations: 0.6498 MB / 0.8383 GB, free: 8.102 MB / 0.6075 GB Notification: Performance of NFTyping.typeBindings: time 0.004785/0.8528, allocations: 1.496 MB / 0.8398 GB, free: 6.922 MB / 0.6075 GB Notification: Performance of NFTyping.typeClassSections: time 0.003241/0.856, allocations: 1.184 MB / 0.8409 GB, free: 6.02 MB / 0.6075 GB Notification: Performance of NFFlatten.flatten: time 0.003861/0.8599, allocations: 2.698 MB / 0.8435 GB, free: 4.453 MB / 0.6075 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001464/0.8614, allocations: 0.9614 MB / 0.8445 GB, free: 3.844 MB / 0.6075 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002521/0.8639, allocations: 1.027 MB / 0.8455 GB, free: 3.254 MB / 0.6075 GB Notification: Performance of NFSimplifyModel.simplify: time 0.00162/0.8656, allocations: 0.9997 MB / 0.8465 GB, free: 2.668 MB / 0.6075 GB Notification: Performance of NFPackage.collectConstants: time 0.0001794/0.8657, allocations: 95.47 kB / 0.8466 GB, free: 2.668 MB / 0.6075 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002636/0.8684, allocations: 1.045 MB / 0.8476 GB, free: 2.191 MB / 0.6075 GB Notification: Performance of NFScalarize.scalarize: time 0.0002946/0.8687, allocations: 283.5 kB / 0.8478 GB, free: 1.973 MB / 0.6075 GB Notification: Performance of NFVerifyModel.verify: time 0.0007047/0.8694, allocations: 0.6143 MB / 0.8484 GB, free: 1.559 MB / 0.6075 GB Notification: Performance of NFConvertDAE.convert: time 0.002788/0.8722, allocations: 1.746 MB / 0.8501 GB, free: 424 kB / 0.6075 GB Notification: Performance of FrontEnd - DAE generated: time 4.569e-06/0.8722, allocations: 0 / 0.8501 GB, free: 424 kB / 0.6075 GB Notification: Performance of FrontEnd: time 1.423e-06/0.8722, allocations: 4 kB / 0.8502 GB, free: 420 kB / 0.6075 GB Notification: Performance of Transformations before backend: time 2.259e-05/0.8723, allocations: 0 / 0.8502 GB, free: 420 kB / 0.6075 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 195 * Number of variables: 195 Notification: Performance of Generate backend data structure: time 0.002795/0.8751, allocations: 1.563 MB / 0.8517 GB, free: 15.21 MB / 0.6231 GB Notification: Performance of prepare preOptimizeDAE: time 4.798e-05/0.8751, allocations: 10.61 kB / 0.8517 GB, free: 15.21 MB / 0.6231 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0003284/0.8755, allocations: 135.8 kB / 0.8518 GB, free: 15.14 MB / 0.6231 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001462/0.8769, allocations: 0.8862 MB / 0.8527 GB, free: 14.44 MB / 0.6231 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.683e-05/0.877, allocations: 58.81 kB / 0.8527 GB, free: 14.41 MB / 0.6231 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001135/0.8771, allocations: 80.06 kB / 0.8528 GB, free: 14.39 MB / 0.6231 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001346/0.8785, allocations: 0.8694 MB / 0.8537 GB, free: 13.81 MB / 0.6231 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.943e-05/0.8785, allocations: 6.906 kB / 0.8537 GB, free: 13.81 MB / 0.6231 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 7.273e-05/0.8786, allocations: 31.12 kB / 0.8537 GB, free: 13.79 MB / 0.6231 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.822e-05/0.8786, allocations: 18.19 kB / 0.8537 GB, free: 13.79 MB / 0.6231 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001105/0.8797, allocations: 0.6355 MB / 0.8543 GB, free: 13.38 MB / 0.6231 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 0.004393/0.8841, allocations: 3.958 MB / 0.8582 GB, free: 9.168 MB / 0.6231 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001135/0.8853, allocations: 0.5652 MB / 0.8588 GB, free: 8.594 MB / 0.6231 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0004646/0.8858, allocations: 294.4 kB / 0.859 GB, free: 8.305 MB / 0.6231 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001018/0.8868, allocations: 1.239 MB / 0.8602 GB, free: 6.789 MB / 0.6231 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0006534/0.8875, allocations: 334.9 kB / 0.8606 GB, free: 6.449 MB / 0.6231 GB Notification: Performance of pre-optimization done (n=63): time 2.996e-06/0.8875, allocations: 0 / 0.8606 GB, free: 6.449 MB / 0.6231 GB Notification: Performance of matching and sorting (n=63): time 0.002636/0.8901, allocations: 1.134 MB / 0.8617 GB, free: 5.266 MB / 0.6231 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.479e-05/0.8902, allocations: 89.66 kB / 0.8618 GB, free: 5.16 MB / 0.6231 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001121/0.8913, allocations: 0.8727 MB / 0.8626 GB, free: 4.262 MB / 0.6231 GB Notification: Performance of collectPreVariables (initialization): time 5.74e-05/0.8914, allocations: 41.7 kB / 0.8627 GB, free: 4.215 MB / 0.6231 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004135/0.8918, allocations: 464.2 kB / 0.8631 GB, free: 3.758 MB / 0.6231 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002111/0.892, allocations: 212.9 kB / 0.8633 GB, free: 3.547 MB / 0.6231 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001864/0.8922, allocations: 110.3 kB / 0.8634 GB, free: 3.434 MB / 0.6231 GB Notification: Performance of setup shared object (initialization): time 0.0001407/0.8924, allocations: 330 kB / 0.8637 GB, free: 3.105 MB / 0.6231 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.000403/0.8928, allocations: 215.4 kB / 0.8639 GB, free: 2.895 MB / 0.6231 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0005066/0.8933, allocations: 316.4 kB / 0.8642 GB, free: 2.551 MB / 0.6231 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0009124/0.8942, allocations: 0.5302 MB / 0.8647 GB, free: 1.992 MB / 0.6231 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.727e-06/0.8942, allocations: 0 / 0.8647 GB, free: 1.992 MB / 0.6231 GB Notification: Performance of matching and sorting (n=75) (initialization): time 0.001293/0.8955, allocations: 0.7174 MB / 0.8654 GB, free: 1.266 MB / 0.6231 GB Notification: Performance of prepare postOptimizeDAE: time 2.039e-05/0.8956, allocations: 4 kB / 0.8654 GB, free: 1.262 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.862e-05/0.8956, allocations: 4 kB / 0.8654 GB, free: 1.258 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0006369/0.8962, allocations: 112.7 kB / 0.8656 GB, free: 1.145 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004426/0.8967, allocations: 115.8 kB / 0.8657 GB, free: 1.031 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0006363/0.8973, allocations: 0.667 MB / 0.8663 GB, free: 348 kB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0005519/0.8979, allocations: 71.2 kB / 0.8664 GB, free: 276 kB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.88e-05/0.898, allocations: 27.98 kB / 0.8664 GB, free: 248 kB / 0.6231 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0006004/0.8986, allocations: 389.3 kB / 0.8668 GB, free: 15.86 MB / 0.6387 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.000431/0.899, allocations: 300.5 kB / 0.8671 GB, free: 15.53 MB / 0.6387 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0007706/0.8998, allocations: 0.5074 MB / 0.8676 GB, free: 14.99 MB / 0.6387 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 1.824e-06/0.8998, allocations: 0 / 0.8676 GB, free: 14.99 MB / 0.6387 GB Notification: Performance of matching and sorting (n=75) (initialization_lambda0): time 0.001139/0.9009, allocations: 0.6862 MB / 0.8682 GB, free: 14.29 MB / 0.6387 GB Notification: Performance of prepare postOptimizeDAE: time 1.168e-05/0.901, allocations: 8 kB / 0.8682 GB, free: 14.29 MB / 0.6387 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.851e-06/0.901, allocations: 4 kB / 0.8682 GB, free: 14.28 MB / 0.6387 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0004301/0.9014, allocations: 108.8 kB / 0.8684 GB, free: 14.17 MB / 0.6387 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003929/0.9018, allocations: 111.8 kB / 0.8685 GB, free: 14.06 MB / 0.6387 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0005421/0.9024, allocations: 0.6693 MB / 0.8691 GB, free: 13.37 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004778/0.9029, allocations: 35.69 kB / 0.8691 GB, free: 13.33 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.643e-05/0.9029, allocations: 27.98 kB / 0.8692 GB, free: 13.3 MB / 0.6387 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 10 * Number of states: 0 () * Number of discrete variables: 5 ($PRE.mRoo_flow.nextTimeEvent,$whenCondition1,mRoo_flow.nextTimeEventScaled,$PRE.mRoo_flow.nextTimeEventScaled,mRoo_flow.nextTimeEvent) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (67): * Single equations (assignments): 66 * 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 {(2,7)} Notification: Performance of prepare postOptimizeDAE: time 0.0002056/0.9031, allocations: 220.2 kB / 0.8694 GB, free: 13.08 MB / 0.6387 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001579/0.9033, allocations: 102.7 kB / 0.8695 GB, free: 12.98 MB / 0.6387 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00171/0.905, allocations: 0.9456 MB / 0.8704 GB, free: 12.02 MB / 0.6387 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.453e-05/0.905, allocations: 8 kB / 0.8704 GB, free: 12.02 MB / 0.6387 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 5.179e-06/0.905, allocations: 0 / 0.8704 GB, free: 12.02 MB / 0.6387 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001199/0.9063, allocations: 0.8542 MB / 0.8712 GB, free: 11.11 MB / 0.6387 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002696/0.909, allocations: 1.853 MB / 0.8731 GB, free: 9.184 MB / 0.6387 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.64e-06/0.909, allocations: 0 / 0.8731 GB, free: 9.184 MB / 0.6387 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004175/0.9094, allocations: 99.89 kB / 0.8732 GB, free: 9.086 MB / 0.6387 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0005149/0.9099, allocations: 153.6 kB / 0.8733 GB, free: 8.93 MB / 0.6387 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.529e-05/0.91, allocations: 19.94 kB / 0.8733 GB, free: 8.91 MB / 0.6387 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0008788/0.9109, allocations: 1.247 MB / 0.8745 GB, free: 7.613 MB / 0.6387 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 5.019e-06/0.9109, allocations: 4.031 kB / 0.8745 GB, free: 7.609 MB / 0.6387 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002022/0.9129, allocations: 1.276 MB / 0.8758 GB, free: 6.301 MB / 0.6387 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003726/0.9133, allocations: 255.6 kB / 0.876 GB, free: 6.031 MB / 0.6387 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001243/0.9134, allocations: 23.94 kB / 0.8761 GB, free: 6.008 MB / 0.6387 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004421/0.9139, allocations: 21.17 kB / 0.8761 GB, free: 5.988 MB / 0.6387 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001165/0.914, allocations: 44.58 kB / 0.8761 GB, free: 5.945 MB / 0.6387 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 5.926e-05/0.9141, allocations: 32 kB / 0.8761 GB, free: 5.914 MB / 0.6387 GB Notification: Performance of sorting global known variables: time 0.0007412/0.9148, allocations: 0.613 MB / 0.8767 GB, free: 5.289 MB / 0.6387 GB Notification: Performance of sort global known variables: time 1.4e-07/0.9148, allocations: 0 / 0.8767 GB, free: 5.289 MB / 0.6387 GB Notification: Performance of remove unused functions: time 0.001383/0.9162, allocations: 0.5573 MB / 0.8773 GB, free: 4.73 MB / 0.6387 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 3 * Number of states: 5 (roo.dynBal.U,roo.dynBal.m,oriChiTop.mExc,oriBot.mExc,oriChiBot.mExc) * Number of discrete variables: 3 ($whenCondition1,mRoo_flow.nextTimeEvent,mRoo_flow.nextTimeEventScaled) * Number of discrete states: 2 (mRoo_flow.nextTimeEvent,mRoo_flow.nextTimeEventScaled) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (62): * Single equations (assignments): 54 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 4 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 2 * 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): 2 systems {(2,9), (1,2)} Notification: Performance of Backend phase and start with SimCode phase: time 0.001558/0.9178, allocations: 0.7231 MB / 0.878 GB, free: 4.172 MB / 0.6387 GB Notification: Performance of simCode: created initialization part: time 0.0019/0.9197, allocations: 0.9258 MB / 0.8789 GB, free: 3.246 MB / 0.6387 GB Notification: Performance of simCode: created event and clocks part: time 7.454e-06/0.9197, allocations: 4 kB / 0.8789 GB, free: 3.242 MB / 0.6387 GB Notification: Performance of simCode: created simulation system equations: time 0.0007623/0.9205, allocations: 392.4 kB / 0.8793 GB, free: 2.863 MB / 0.6387 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001877/0.9224, allocations: 453 kB / 0.8797 GB, free: 2.43 MB / 0.6387 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003362/0.9257, allocations: 2.093 MB / 0.8818 GB, free: 296 kB / 0.6387 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000624/0.9264, allocations: 1.065 MB / 0.8828 GB, free: 15.2 MB / 0.6544 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002337/0.9266, allocations: 83.41 kB / 0.8829 GB, free: 15.11 MB / 0.6544 GB Notification: Performance of SimCode: time 8.22e-07/0.9266, allocations: 0 / 0.8829 GB, free: 15.11 MB / 0.6544 GB Notification: Performance of Templates: time 0.03487/0.9615, allocations: 23.58 MB / 0.9059 GB, free: 7.629 MB / 0.67 GB make -j1 -f IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.makefile (rm -f IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; mkfifo IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; head -c 1048576 < IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe >> ../files/IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.sim & ./IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume -abortSlowSimulation -alarm=480 -lv LOG_STATS > IDEAS_dev_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe 2>&1)