Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_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/package.mo", uses=false) Using package IDEAS with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0/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_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume") translateModel(IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_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 0.001245/0.001245, allocations: 103.2 kB / 16.35 MB, free: 5.828 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.00152/0.00152, allocations: 193.2 kB / 17.29 MB, free: 5.484 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.37/1.37, 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/package.mo): time 0.8426/0.8426, allocations: 132.2 MB / 423.3 MB, free: 6.609 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001235/0.001235, allocations: 63.91 kB / 0.5032 GB, free: 10.98 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.4405/0.4417, allocations: 80.18 MB / 0.5815 GB, free: 27.61 MB / 446.1 MB Notification: Performance of NFInst.instantiate(IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume): time 0.1739/0.6156, allocations: 167.6 MB / 0.7451 GB, free: 6.121 MB / 0.5762 GB Notification: Performance of NFInst.instExpressions: time 0.4975/1.113, allocations: 8.897 MB / 0.7538 GB, free: 1.465 MB / 0.5762 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002872/1.116, allocations: 39.09 kB / 0.7538 GB, free: 1.465 MB / 0.5762 GB Notification: Performance of NFTyping.typeComponents: time 0.002802/1.119, allocations: 0.6443 MB / 0.7545 GB, free: 1.465 MB / 0.5762 GB Notification: Performance of NFTyping.typeBindings: time 0.005261/1.124, allocations: 1.5 MB / 0.7559 GB, free: 1.445 MB / 0.5762 GB Notification: Performance of NFTyping.typeClassSections: time 0.003966/1.128, allocations: 1.189 MB / 0.7571 GB, free: 1.422 MB / 0.5762 GB Notification: Performance of NFFlatten.flatten: time 0.005221/1.133, allocations: 2.691 MB / 0.7597 GB, free: 1.422 MB / 0.5762 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0022/1.136, allocations: 0.9661 MB / 0.7607 GB, free: 1.32 MB / 0.5762 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003602/1.139, allocations: 1.017 MB / 0.7617 GB, free: 1.316 MB / 0.5762 GB Notification: Performance of NFSimplifyModel.simplify: time 0.00271/1.142, allocations: 0.9935 MB / 0.7626 GB, free: 1.316 MB / 0.5762 GB Notification: Performance of NFPackage.collectConstants: time 0.0003735/1.142, allocations: 96.28 kB / 0.7627 GB, free: 1.316 MB / 0.5762 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003434/1.146, allocations: 1.054 MB / 0.7638 GB, free: 1.297 MB / 0.5762 GB Notification: Performance of NFScalarize.scalarize: time 0.0003567/1.146, allocations: 276.8 kB / 0.764 GB, free: 1.297 MB / 0.5762 GB Notification: Performance of NFVerifyModel.verify: time 0.001037/1.147, allocations: 0.6094 MB / 0.7646 GB, free: 1.297 MB / 0.5762 GB Notification: Performance of NFConvertDAE.convert: time 0.003544/1.151, allocations: 1.746 MB / 0.7663 GB, free: 1.18 MB / 0.5762 GB Notification: Performance of FrontEnd - DAE generated: time 4.919e-06/1.151, allocations: 0 / 0.7663 GB, free: 1.18 MB / 0.5762 GB Notification: Performance of FrontEnd: time 2.063e-06/1.151, allocations: 0.9062 kB / 0.7663 GB, free: 1.18 MB / 0.5762 GB Notification: Performance of Transformations before backend: time 2.326e-05/1.151, allocations: 0.75 kB / 0.7663 GB, free: 1.18 MB / 0.5762 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 0.003421/1.154, allocations: 1.563 MB / 0.7678 GB, free: 16.34 MB / 0.5919 GB Notification: Performance of prepare preOptimizeDAE: time 5.156e-05/1.154, allocations: 10.19 kB / 0.7679 GB, free: 16.34 MB / 0.5919 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0003974/1.155, allocations: 133.6 kB / 0.768 GB, free: 16.28 MB / 0.5919 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001987/1.157, allocations: 0.8845 MB / 0.7688 GB, free: 15.93 MB / 0.5919 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 8.371e-05/1.157, allocations: 65.97 kB / 0.7689 GB, free: 15.93 MB / 0.5919 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001535/1.157, allocations: 77.19 kB / 0.769 GB, free: 15.93 MB / 0.5919 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00171/1.159, allocations: 0.8688 MB / 0.7698 GB, free: 15.76 MB / 0.5919 GB Notification: Performance of preOpt findStateOrder (simulation): time 3.037e-05/1.159, allocations: 6.844 kB / 0.7698 GB, free: 15.76 MB / 0.5919 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 7.56e-05/1.159, allocations: 32.56 kB / 0.7699 GB, free: 15.76 MB / 0.5919 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 2.668e-05/1.159, allocations: 19.19 kB / 0.7699 GB, free: 15.76 MB / 0.5919 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001234/1.16, allocations: 0.6374 MB / 0.7705 GB, free: 15.75 MB / 0.5919 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 0.004676/1.165, allocations: 3.96 MB / 0.7744 GB, free: 13.61 MB / 0.5919 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001082/1.166, allocations: 0.5716 MB / 0.7749 GB, free: 13.58 MB / 0.5919 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0004412/1.166, allocations: 292.2 kB / 0.7752 GB, free: 13.57 MB / 0.5919 GB Notification: Performance of preOpt evalFunc (simulation): time 0.001082/1.168, allocations: 1.239 MB / 0.7764 GB, free: 12.17 MB / 0.5919 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0006043/1.168, allocations: 327.8 kB / 0.7767 GB, free: 12.11 MB / 0.5919 GB Notification: Performance of pre-optimization done (n=63): time 2.555e-06/1.168, allocations: 0 / 0.7767 GB, free: 12.11 MB / 0.5919 GB Notification: Performance of matching and sorting (n=63): time 0.002485/1.171, allocations: 1.136 MB / 0.7778 GB, free: 11.8 MB / 0.5919 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001003/1.171, allocations: 87.48 kB / 0.7779 GB, free: 11.71 MB / 0.5919 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001025/1.172, allocations: 0.8693 MB / 0.7788 GB, free: 11.56 MB / 0.5919 GB Notification: Performance of collectPreVariables (initialization): time 6.073e-05/1.172, allocations: 42.98 kB / 0.7788 GB, free: 11.53 MB / 0.5919 GB Notification: Performance of collectInitialEqns (initialization): time 0.000335/1.172, allocations: 466.5 kB / 0.7793 GB, free: 11.36 MB / 0.5919 GB Notification: Performance of collectInitialBindings (initialization): time 0.000201/1.172, allocations: 217.7 kB / 0.7795 GB, free: 11.23 MB / 0.5919 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001735/1.173, allocations: 121.2 kB / 0.7796 GB, free: 11.21 MB / 0.5919 GB Notification: Performance of setup shared object (initialization): time 0.0001151/1.173, allocations: 328.1 kB / 0.7799 GB, free: 10.9 MB / 0.5919 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.000362/1.173, allocations: 211.8 kB / 0.7801 GB, free: 10.89 MB / 0.5919 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0004455/1.174, allocations: 310.9 kB / 0.7804 GB, free: 10.8 MB / 0.5919 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0007843/1.174, allocations: 0.5343 MB / 0.7809 GB, free: 10.71 MB / 0.5919 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.508e-06/1.174, allocations: 3.281 kB / 0.7809 GB, free: 10.71 MB / 0.5919 GB Notification: Performance of matching and sorting (n=75) (initialization): time 0.001211/1.176, allocations: 0.7098 MB / 0.7816 GB, free: 10.61 MB / 0.5919 GB Notification: Performance of prepare postOptimizeDAE: time 2.054e-05/1.176, allocations: 9.781 kB / 0.7816 GB, free: 10.61 MB / 0.5919 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.867e-06/1.176, allocations: 2.656 kB / 0.7816 GB, free: 10.61 MB / 0.5919 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0005623/1.176, allocations: 108.5 kB / 0.7817 GB, free: 10.6 MB / 0.5919 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004422/1.177, allocations: 117.9 kB / 0.7818 GB, free: 10.59 MB / 0.5919 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0005686/1.177, allocations: 0.6673 MB / 0.7825 GB, free: 10.07 MB / 0.5919 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0005599/1.178, allocations: 60.39 kB / 0.7826 GB, free: 10.04 MB / 0.5919 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.595e-05/1.178, allocations: 26.34 kB / 0.7826 GB, free: 10.04 MB / 0.5919 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0005529/1.178, allocations: 394.4 kB / 0.783 GB, free: 9.957 MB / 0.5919 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0004057/1.179, allocations: 300.2 kB / 0.7832 GB, free: 9.871 MB / 0.5919 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0007108/1.18, allocations: 0.514 MB / 0.7837 GB, free: 9.781 MB / 0.5919 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 2.865e-06/1.18, allocations: 3.266 kB / 0.7837 GB, free: 9.781 MB / 0.5919 GB Notification: Performance of matching and sorting (n=75) (initialization_lambda0): time 0.00109/1.181, allocations: 0.6884 MB / 0.7844 GB, free: 9.68 MB / 0.5919 GB Notification: Performance of prepare postOptimizeDAE: time 1.024e-05/1.181, allocations: 4.719 kB / 0.7844 GB, free: 9.68 MB / 0.5919 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 3.596e-06/1.181, allocations: 2.188 kB / 0.7844 GB, free: 9.68 MB / 0.5919 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0004134/1.181, allocations: 108.1 kB / 0.7845 GB, free: 9.672 MB / 0.5919 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003803/1.182, allocations: 112.7 kB / 0.7846 GB, free: 9.672 MB / 0.5919 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.00053/1.182, allocations: 0.6664 MB / 0.7853 GB, free: 9.148 MB / 0.5919 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0005113/1.183, allocations: 41.16 kB / 0.7853 GB, free: 9.129 MB / 0.5919 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.951e-05/1.183, allocations: 28.58 kB / 0.7854 GB, free: 9.129 MB / 0.5919 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 0.0002303/1.183, allocations: 215.5 kB / 0.7856 GB, free: 8.945 MB / 0.5919 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001807/1.183, allocations: 109.5 kB / 0.7857 GB, free: 8.895 MB / 0.5919 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001709/1.185, allocations: 0.9402 MB / 0.7866 GB, free: 8.801 MB / 0.5919 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.644e-05/1.185, allocations: 11.22 kB / 0.7866 GB, free: 8.801 MB / 0.5919 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.111e-06/1.185, allocations: 0 / 0.7866 GB, free: 8.801 MB / 0.5919 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001163/1.186, allocations: 0.8564 MB / 0.7874 GB, free: 8.52 MB / 0.5919 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002732/1.189, allocations: 1.842 MB / 0.7892 GB, free: 8.156 MB / 0.5919 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.57e-06/1.189, allocations: 0 / 0.7892 GB, free: 8.156 MB / 0.5919 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004023/1.189, allocations: 102.1 kB / 0.7893 GB, free: 8.156 MB / 0.5919 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0004902/1.19, allocations: 152.4 kB / 0.7895 GB, free: 8.141 MB / 0.5919 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.534e-05/1.19, allocations: 19.48 kB / 0.7895 GB, free: 8.141 MB / 0.5919 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0008035/1.191, allocations: 1.249 MB / 0.7907 GB, free: 7.098 MB / 0.5919 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.715e-06/1.191, allocations: 8.156 kB / 0.7907 GB, free: 7.094 MB / 0.5919 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001821/1.192, allocations: 1.274 MB / 0.792 GB, free: 6.852 MB / 0.5919 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003986/1.193, allocations: 255.5 kB / 0.7922 GB, free: 6.695 MB / 0.5919 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001197/1.193, allocations: 23.8 kB / 0.7922 GB, free: 6.691 MB / 0.5919 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.000433/1.193, allocations: 29.17 kB / 0.7923 GB, free: 6.688 MB / 0.5919 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 9.596e-05/1.193, allocations: 43.34 kB / 0.7923 GB, free: 6.684 MB / 0.5919 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 5.597e-05/1.194, allocations: 28.47 kB / 0.7923 GB, free: 6.684 MB / 0.5919 GB Notification: Performance of sorting global known variables: time 0.000668/1.194, allocations: 0.61 MB / 0.7929 GB, free: 6.574 MB / 0.5919 GB Notification: Performance of sort global known variables: time 1.4e-07/1.194, allocations: 0 / 0.7929 GB, free: 6.574 MB / 0.5919 GB Notification: Performance of remove unused functions: time 0.001414/1.196, allocations: 0.5629 MB / 0.7935 GB, free: 6.484 MB / 0.5919 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 0.001533/1.197, allocations: 0.7096 MB / 0.7942 GB, free: 6.301 MB / 0.5919 GB Notification: Performance of simCode: created initialization part: time 0.001697/1.199, allocations: 0.9255 MB / 0.7951 GB, free: 6.289 MB / 0.5919 GB Notification: Performance of simCode: created event and clocks part: time 2.896e-06/1.199, allocations: 0.9375 kB / 0.7951 GB, free: 6.289 MB / 0.5919 GB Notification: Performance of simCode: created simulation system equations: time 0.0006963/1.2, allocations: 387.2 kB / 0.7954 GB, free: 6.285 MB / 0.5919 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001858/1.201, allocations: 454.5 kB / 0.7959 GB, free: 6.238 MB / 0.5919 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003243/1.205, allocations: 2.062 MB / 0.7979 GB, free: 5.375 MB / 0.5919 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0005948/1.205, allocations: 1.064 MB / 0.7989 GB, free: 4.656 MB / 0.5919 GB Notification: Performance of simCode: alias equations: time 0.0007251/1.206, allocations: 222.2 kB / 0.7991 GB, free: 4.602 MB / 0.5919 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001973/1.206, allocations: 80.77 kB / 0.7992 GB, free: 4.594 MB / 0.5919 GB Notification: Performance of SimCode: time 7.31e-07/1.206, allocations: 0 / 0.7992 GB, free: 4.594 MB / 0.5919 GB Notification: Performance of Templates: time 0.03613/1.242, allocations: 21.03 MB / 0.8197 GB, free: 10.48 MB / 0.6075 GB make -j1 -f IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.makefile (rm -f IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; mkfifo IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; head -c 1048576 < IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe >> ../files/IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.sim & ./IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume -abortSlowSimulation -alarm=480 -s cvode -lv LOG_STATS > IDEAS_IDEAS.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe 2>&1)