Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr BuildSysPro_BuildSysPro.IBPSA.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/BuildSysPro 3.6.0/package.mo", uses=false) Using package BuildSysPro with version 3.5.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.6.0/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(BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume") translateModel(BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0009978/0.0009978, allocations: 98.27 kB / 15.36 MB, free: 0.7344 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.005591/0.005591, allocations: 170.6 kB / 16.27 MB, free: 6.652 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.146/1.146, allocations: 223.3 MB / 240.3 MB, free: 5.32 MB / 190.1 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.6.0/Building/BuildingEnvelope/HeatTransfer/package.mo:2:1-40:17:writable] Warning: Soil_case_nappe was referenced in the package.order file, but was not found in package.mo, Soil_case_nappe/package.mo or Soil_case_nappe.mo. Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildSysPro 3.6.0/package.mo): time 0.8417/0.8417, allocations: 143.2 MB / 434.6 MB, free: 13.64 MB / 350.1 MB Notification: Performance of FrontEnd - loaded program: time 0.0002623/0.0002623, allocations: 8 kB / 0.5164 GB, free: 11.1 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.122/0.1223, allocations: 83.4 MB / 0.5978 GB, free: 7.664 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume): time 0.3415/0.4638, allocations: 163 MB / 0.757 GB, free: 8.781 MB / 0.5762 GB Notification: Performance of NFInst.instExpressions: time 0.01039/0.4743, allocations: 8.844 MB / 0.7656 GB, free: 15.92 MB / 0.5919 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0005462/0.4748, allocations: 35.75 kB / 0.7657 GB, free: 15.88 MB / 0.5919 GB Notification: Performance of NFTyping.typeComponents: time 0.001132/0.476, allocations: 0.5558 MB / 0.7662 GB, free: 15.32 MB / 0.5919 GB Notification: Performance of NFTyping.typeBindings: time 0.002255/0.4782, allocations: 1.389 MB / 0.7676 GB, free: 13.93 MB / 0.5919 GB Notification: Performance of NFTyping.typeClassSections: time 0.00193/0.4802, allocations: 1.069 MB / 0.7686 GB, free: 12.87 MB / 0.5919 GB Notification: Performance of NFFlatten.flatten: time 0.002864/0.483, allocations: 3.652 MB / 0.7722 GB, free: 9.211 MB / 0.5919 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0008696/0.4839, allocations: 0.8207 MB / 0.773 GB, free: 8.375 MB / 0.5919 GB Notification: Performance of NFEvalConstants.evaluate: time 0.0009648/0.4849, allocations: 0.8595 MB / 0.7738 GB, free: 7.512 MB / 0.5919 GB Notification: Performance of NFSimplifyModel.simplify: time 0.00096/0.4859, allocations: 0.9686 MB / 0.7748 GB, free: 6.539 MB / 0.5919 GB Notification: Performance of NFPackage.collectConstants: time 8.628e-05/0.486, allocations: 48 kB / 0.7748 GB, free: 6.492 MB / 0.5919 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001515/0.4875, allocations: 1.006 MB / 0.7758 GB, free: 5.484 MB / 0.5919 GB Notification: Performance of NFScalarize.scalarize: time 0.0001927/0.4877, allocations: 231 kB / 0.776 GB, free: 5.258 MB / 0.5919 GB Notification: Performance of NFVerifyModel.verify: time 0.0004359/0.4881, allocations: 0.5649 MB / 0.7766 GB, free: 4.684 MB / 0.5919 GB Notification: Performance of NFConvertDAE.convert: time 0.001489/0.4896, allocations: 1.701 MB / 0.7782 GB, free: 2.977 MB / 0.5919 GB Notification: Performance of FrontEnd - DAE generated: time 3.146e-06/0.4896, allocations: 0 / 0.7782 GB, free: 2.977 MB / 0.5919 GB Notification: Performance of FrontEnd: time 9.51e-07/0.4896, allocations: 0 / 0.7782 GB, free: 2.977 MB / 0.5919 GB Notification: Performance of Transformations before backend: time 9.628e-06/0.4897, allocations: 0 / 0.7782 GB, free: 2.977 MB / 0.5919 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 0.001964/0.4916, allocations: 1.365 MB / 0.7796 GB, free: 1.562 MB / 0.5919 GB Notification: Performance of prepare preOptimizeDAE: time 2.81e-05/0.4917, allocations: 8.031 kB / 0.7796 GB, free: 1.555 MB / 0.5919 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0002343/0.4919, allocations: 139.8 kB / 0.7797 GB, free: 1.418 MB / 0.5919 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001094/0.493, allocations: 0.8689 MB / 0.7806 GB, free: 0.5078 MB / 0.5919 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 4.661e-05/0.4931, allocations: 61.94 kB / 0.7806 GB, free: 456 kB / 0.5919 GB Notification: Performance of preOpt expandDerOperator (simulation): time 9.841e-05/0.4932, allocations: 80 kB / 0.7807 GB, free: 376 kB / 0.5919 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001236/0.4944, allocations: 0.8732 MB / 0.7815 GB, free: 15.45 MB / 0.6075 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.9e-05/0.4944, allocations: 0 / 0.7815 GB, free: 15.45 MB / 0.6075 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.42e-05/0.4945, allocations: 32 kB / 0.7816 GB, free: 15.42 MB / 0.6075 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.86e-05/0.4945, allocations: 20.56 kB / 0.7816 GB, free: 15.4 MB / 0.6075 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001024/0.4956, allocations: 0.6479 MB / 0.7822 GB, free: 14.75 MB / 0.6075 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 0.003754/0.4993, allocations: 3.973 MB / 0.7861 GB, free: 10.52 MB / 0.6075 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001019/0.5003, allocations: 0.5816 MB / 0.7867 GB, free: 9.93 MB / 0.6075 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0004438/0.5008, allocations: 299 kB / 0.787 GB, free: 9.641 MB / 0.6075 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0009021/0.5017, allocations: 1.247 MB / 0.7882 GB, free: 8.117 MB / 0.6075 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0005505/0.5023, allocations: 335.6 kB / 0.7885 GB, free: 7.781 MB / 0.6075 GB Notification: Performance of pre-optimization done (n=63): time 1.723e-06/0.5023, allocations: 0 / 0.7885 GB, free: 7.781 MB / 0.6075 GB Notification: Performance of matching and sorting (n=63): time 0.002206/0.5045, allocations: 1.15 MB / 0.7896 GB, free: 6.578 MB / 0.6075 GB Notification: Performance of inlineWhenForInitialization (initialization): time 6.003e-05/0.5046, allocations: 93.61 kB / 0.7897 GB, free: 6.469 MB / 0.6075 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.000934/0.5055, allocations: 0.8572 MB / 0.7905 GB, free: 5.586 MB / 0.6075 GB Notification: Performance of collectPreVariables (initialization): time 4.711e-05/0.5056, allocations: 41.7 kB / 0.7906 GB, free: 5.539 MB / 0.6075 GB Notification: Performance of collectInitialEqns (initialization): time 0.0003116/0.5059, allocations: 472.2 kB / 0.791 GB, free: 5.074 MB / 0.6075 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001493/0.506, allocations: 212.8 kB / 0.7912 GB, free: 4.863 MB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 6.725e-05/0.5061, allocations: 53.7 kB / 0.7913 GB, free: 4.805 MB / 0.6075 GB Notification: Performance of setup shared object (initialization): time 9.774e-05/0.5062, allocations: 330 kB / 0.7916 GB, free: 4.477 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0003639/0.5066, allocations: 209.2 kB / 0.7918 GB, free: 4.273 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0004271/0.507, allocations: 320.4 kB / 0.7921 GB, free: 3.926 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.000785/0.5078, allocations: 0.5387 MB / 0.7926 GB, free: 3.359 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.655e-06/0.5078, allocations: 0 / 0.7926 GB, free: 3.359 MB / 0.6075 GB Notification: Performance of matching and sorting (n=75) (initialization): time 0.001106/0.5089, allocations: 0.725 MB / 0.7933 GB, free: 2.621 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 6.859e-05/0.509, allocations: 156.2 kB / 0.7935 GB, free: 2.438 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.893e-06/0.509, allocations: 4 kB / 0.7935 GB, free: 2.434 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0004485/0.5095, allocations: 100.8 kB / 0.7936 GB, free: 2.332 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003902/0.5099, allocations: 123.8 kB / 0.7937 GB, free: 2.211 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0004746/0.5104, allocations: 0.666 MB / 0.7944 GB, free: 1.52 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004834/0.5109, allocations: 91.53 kB / 0.7944 GB, free: 1.43 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.581e-05/0.5109, allocations: 35.86 kB / 0.7945 GB, free: 1.395 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 5.991e-06/0.5109, allocations: 4 kB / 0.7945 GB, free: 1.391 MB / 0.6075 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.0008854/0.5118, allocations: 0.5761 MB / 0.795 GB, free: 0.8086 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.388e-06/0.5118, allocations: 4 kB / 0.7951 GB, free: 0.8047 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0003729/0.5122, allocations: 104.7 kB / 0.7952 GB, free: 0.6992 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003621/0.5126, allocations: 120.7 kB / 0.7953 GB, free: 0.582 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0004489/0.513, allocations: 0.6537 MB / 0.7959 GB, free: 15.9 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0004471/0.5135, allocations: 95.39 kB / 0.796 GB, free: 15.81 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.911e-05/0.5135, allocations: 24 kB / 0.796 GB, free: 15.79 MB / 0.6231 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 0.000307/0.5139, allocations: 330.1 kB / 0.7963 GB, free: 15.45 MB / 0.6231 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001132/0.514, allocations: 103.4 kB / 0.7964 GB, free: 15.35 MB / 0.6231 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001537/0.5155, allocations: 0.9505 MB / 0.7974 GB, free: 14.4 MB / 0.6231 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.167e-05/0.5155, allocations: 8 kB / 0.7974 GB, free: 14.39 MB / 0.6231 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.278e-06/0.5155, allocations: 0 / 0.7974 GB, free: 14.39 MB / 0.6231 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001135/0.5167, allocations: 0.8621 MB / 0.7982 GB, free: 13.47 MB / 0.6231 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002321/0.519, allocations: 1.865 MB / 0.8 GB, free: 11.54 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.659e-06/0.519, allocations: 0.5 kB / 0.8 GB, free: 11.54 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0003821/0.5194, allocations: 103.9 kB / 0.8001 GB, free: 11.44 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.00052/0.52, allocations: 165.5 kB / 0.8003 GB, free: 11.27 MB / 0.6231 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.202e-05/0.52, allocations: 24.73 kB / 0.8003 GB, free: 11.25 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0007517/0.5208, allocations: 1.241 MB / 0.8015 GB, free: 9.957 MB / 0.6231 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.615e-06/0.5208, allocations: 4.062 kB / 0.8015 GB, free: 9.953 MB / 0.6231 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001788/0.5226, allocations: 1.293 MB / 0.8028 GB, free: 8.633 MB / 0.6231 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0002886/0.5229, allocations: 275.5 kB / 0.8031 GB, free: 8.344 MB / 0.6231 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 9.665e-05/0.523, allocations: 13.47 kB / 0.8031 GB, free: 8.332 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.000468/0.5234, allocations: 67.8 kB / 0.8031 GB, free: 8.266 MB / 0.6231 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 9.495e-05/0.5235, allocations: 56.5 kB / 0.8032 GB, free: 8.211 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.342e-05/0.5236, allocations: 23.98 kB / 0.8032 GB, free: 8.188 MB / 0.6231 GB Notification: Performance of sorting global known variables: time 0.0006333/0.5242, allocations: 0.613 MB / 0.8038 GB, free: 7.562 MB / 0.6231 GB Notification: Performance of sort global known variables: time 1.2e-07/0.5242, allocations: 0 / 0.8038 GB, free: 7.562 MB / 0.6231 GB Notification: Performance of remove unused functions: time 0.001004/0.5253, allocations: 0.5534 MB / 0.8043 GB, free: 7.008 MB / 0.6231 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 0.001253/0.5265, allocations: 0.701 MB / 0.805 GB, free: 6.488 MB / 0.6231 GB Notification: Performance of simCode: created initialization part: time 0.001517/0.528, allocations: 0.9342 MB / 0.8059 GB, free: 5.559 MB / 0.6231 GB Notification: Performance of simCode: created event and clocks part: time 2.104e-06/0.528, allocations: 0 / 0.8059 GB, free: 5.559 MB / 0.6231 GB Notification: Performance of simCode: created simulation system equations: time 0.0006434/0.5287, allocations: 383.6 kB / 0.8063 GB, free: 5.184 MB / 0.6231 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001856/0.5306, allocations: 442.1 kB / 0.8067 GB, free: 4.754 MB / 0.6231 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002815/0.5334, allocations: 2.599 MB / 0.8093 GB, free: 2.117 MB / 0.6231 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0005257/0.5339, allocations: 1.069 MB / 0.8103 GB, free: 1.016 MB / 0.6231 GB Notification: Performance of simCode: alias equations: time 0.0006225/0.5346, allocations: 214.5 kB / 0.8105 GB, free: 0.8086 MB / 0.6231 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000166/0.5347, allocations: 83.41 kB / 0.8106 GB, free: 0.7266 MB / 0.6231 GB Notification: Performance of SimCode: time 2.61e-07/0.5347, allocations: 0 / 0.8106 GB, free: 0.7266 MB / 0.6231 GB Notification: Performance of Templates: time 0.02637/0.5611, allocations: 20.19 MB / 0.8303 GB, free: 12.8 MB / 0.6544 GB make -j1 -f BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.makefile (rm -f BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; mkfifo BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe ; head -c 1048576 < BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe >> ../files/BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.sim & ./BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume -abortSlowSimulation -alarm=480 -lv LOG_STATS > BuildSysPro_BuildSysPro.IBPSA.Airflow.Multizone.Examples.ChimneyShaftNoVolume.pipe 2>&1)