Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.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 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo", uses=false) Using package Buildings with version 8.1.4 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/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 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(Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10,tolerance=1e-06,outputFormat="empty",numberOfIntervals=172800,variableFilter="",fileNamePrefix="Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10") translateModel(Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10,tolerance=1e-06,outputFormat="empty",numberOfIntervals=172800,variableFilter="",fileNamePrefix="Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001154/0.001154, allocations: 101.4 kB / 15.7 MB, free: 28 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.00107/0.00107, allocations: 195.6 kB / 16.64 MB, free: 6.438 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.106/1.106, allocations: 205.1 MB / 222.5 MB, free: 4.574 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo): time 1.474/1.474, allocations: 292.3 MB / 0.549 GB, free: 12.76 MB / 462.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.001277/0.001277, allocations: 73.55 kB / 0.6723 GB, free: 26.06 MB / 0.5294 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1596/0.1609, allocations: 114.5 MB / 0.7841 GB, free: 12.76 MB / 0.6075 GB Notification: Performance of NFInst.instantiate(Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10): time 0.4359/0.5968, allocations: 157.5 MB / 0.9379 GB, free: 5.137 MB / 0.7169 GB Notification: Performance of NFInst.instExpressions: time 0.0188/0.6157, allocations: 21.86 MB / 0.9593 GB, free: 4.715 MB / 0.7169 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001805/0.6175, allocations: 53.38 kB / 0.9593 GB, free: 4.715 MB / 0.7169 GB Notification: Performance of NFTyping.typeComponents: time 0.002015/0.6196, allocations: 2.169 MB / 0.9615 GB, free: 4.559 MB / 0.7169 GB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/Utilities/Strings.mo:139:3-175:14:writable] Warning: Pure function 'Modelica.Utilities.Strings.isEmpty' contains a call to impure function 'Modelica.Utilities.Strings.Advanced.skipWhiteSpace'. Notification: Performance of NFTyping.typeBindings: time 0.001664/0.6212, allocations: 1.454 MB / 0.9629 GB, free: 4.34 MB / 0.7169 GB Notification: Performance of NFTyping.typeClassSections: time 0.001116/0.6224, allocations: 0.5587 MB / 0.9634 GB, free: 4.297 MB / 0.7169 GB Notification: Performance of NFFlatten.flatten: time 0.001355/0.6237, allocations: 1.92 MB / 0.9653 GB, free: 4.039 MB / 0.7169 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0009671/0.6247, allocations: 1.118 MB / 0.9664 GB, free: 3.91 MB / 0.7169 GB Notification: Performance of NFEvalConstants.evaluate: time 0.000824/0.6255, allocations: 0.917 MB / 0.9673 GB, free: 3.883 MB / 0.7169 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001303/0.6269, allocations: 1.586 MB / 0.9688 GB, free: 3.77 MB / 0.7169 GB Notification: Performance of NFPackage.collectConstants: time 0.0001417/0.627, allocations: 95.88 kB / 0.9689 GB, free: 3.77 MB / 0.7169 GB Notification: Performance of NFFlatten.collectFunctions: time 0.0002711/0.6273, allocations: 148.9 kB / 0.9691 GB, free: 3.762 MB / 0.7169 GB Notification: Performance of NFScalarize.scalarize: time 0.000316/0.6276, allocations: 0.544 MB / 0.9696 GB, free: 3.664 MB / 0.7169 GB Notification: Performance of NFVerifyModel.verify: time 0.000443/0.6281, allocations: 0.7999 MB / 0.9704 GB, free: 3.316 MB / 0.7169 GB Notification: Performance of NFConvertDAE.convert: time 0.001142/0.6292, allocations: 1.934 MB / 0.9723 GB, free: 2.699 MB / 0.7169 GB Notification: Performance of FrontEnd - DAE generated: time 3.246e-06/0.6292, allocations: 0 / 0.9723 GB, free: 2.699 MB / 0.7169 GB Notification: Performance of FrontEnd: time 1.072e-06/0.6292, allocations: 0 / 0.9723 GB, free: 2.699 MB / 0.7169 GB Notification: Performance of Transformations before backend: time 1.631e-05/0.6292, allocations: 0 / 0.9723 GB, free: 2.699 MB / 0.7169 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 165 * Number of variables: 165 Notification: Performance of Generate backend data structure: time 0.002509/0.6318, allocations: 2.344 MB / 0.9746 GB, free: 17.16 MB / 0.7325 GB Notification: Performance of prepare preOptimizeDAE: time 2.629e-05/0.6318, allocations: 8.344 kB / 0.9746 GB, free: 17.16 MB / 0.7325 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0002013/0.632, allocations: 243.7 kB / 0.9748 GB, free: 17.03 MB / 0.7325 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0009858/0.633, allocations: 1.045 MB / 0.9758 GB, free: 16.36 MB / 0.7325 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001202/0.6331, allocations: 93.69 kB / 0.9759 GB, free: 16.3 MB / 0.7325 GB Notification: Performance of preOpt expandDerOperator (simulation): time 8.718e-05/0.6332, allocations: 71.06 kB / 0.976 GB, free: 16.27 MB / 0.7325 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001096/0.6343, allocations: 0.778 MB / 0.9767 GB, free: 15.96 MB / 0.7325 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.957e-05/0.6343, allocations: 0 / 0.9767 GB, free: 15.96 MB / 0.7325 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 5.297e-05/0.6344, allocations: 32.52 kB / 0.9768 GB, free: 15.94 MB / 0.7325 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.267e-05/0.6344, allocations: 17.5 kB / 0.9768 GB, free: 15.94 MB / 0.7325 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0009974/0.6354, allocations: 0.6331 MB / 0.9774 GB, free: 15.73 MB / 0.7325 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.003979/0.6394, allocations: 3.711 MB / 0.981 GB, free: 12.85 MB / 0.7325 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001313/0.6407, allocations: 0.7536 MB / 0.9818 GB, free: 12.47 MB / 0.7325 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0006424/0.6414, allocations: 429.3 kB / 0.9822 GB, free: 12.26 MB / 0.7325 GB Notification: Performance of preOpt evalFunc (simulation): time 4.101e-05/0.6414, allocations: 10.88 kB / 0.9822 GB, free: 12.26 MB / 0.7325 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0006742/0.6421, allocations: 450.6 kB / 0.9826 GB, free: 11.99 MB / 0.7325 GB Notification: Performance of pre-optimization done (n=73): time 1.923e-06/0.6421, allocations: 0 / 0.9826 GB, free: 11.99 MB / 0.7325 GB Notification: Performance of matching and sorting (n=73): time 0.003562/0.6457, allocations: 1.833 MB / 0.9844 GB, free: 10.96 MB / 0.7325 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.582e-05/0.6457, allocations: 58.75 kB / 0.9845 GB, free: 10.89 MB / 0.7325 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002692/0.6484, allocations: 3.367 MB / 0.9877 GB, free: 9.426 MB / 0.7325 GB Notification: Performance of collectPreVariables (initialization): time 5.715e-05/0.6485, allocations: 46.56 kB / 0.9878 GB, free: 9.379 MB / 0.7325 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006486/0.6492, allocations: 0.9236 MB / 0.9887 GB, free: 8.582 MB / 0.7325 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001581/0.6493, allocations: 234.2 kB / 0.9889 GB, free: 8.391 MB / 0.7325 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001786/0.6495, allocations: 138.7 kB / 0.989 GB, free: 8.309 MB / 0.7325 GB Notification: Performance of setup shared object (initialization): time 0.0001154/0.6496, allocations: 345.4 kB / 0.9894 GB, free: 7.973 MB / 0.7325 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0005653/0.6502, allocations: 317.3 kB / 0.9897 GB, free: 7.824 MB / 0.7325 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0006708/0.6509, allocations: 475.5 kB / 0.9901 GB, free: 7.496 MB / 0.7325 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.00111/0.652, allocations: 0.7473 MB / 0.9909 GB, free: 7.047 MB / 0.7325 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.858e-06/0.652, allocations: 2.281 kB / 0.9909 GB, free: 7.047 MB / 0.7325 GB Notification: Performance of matching and sorting (n=99) (initialization): time 0.001918/0.6539, allocations: 1.25 MB / 0.9921 GB, free: 6.398 MB / 0.7325 GB Notification: Performance of prepare postOptimizeDAE: time 1.612e-05/0.654, allocations: 4.938 kB / 0.9921 GB, free: 6.398 MB / 0.7325 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.522e-06/0.654, allocations: 7.375 kB / 0.9921 GB, free: 6.395 MB / 0.7325 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0005852/0.6546, allocations: 260.5 kB / 0.9923 GB, free: 6.277 MB / 0.7325 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004475/0.655, allocations: 136.6 kB / 0.9925 GB, free: 6.242 MB / 0.7325 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.004164/0.6592, allocations: 4.743 MB / 0.9971 GB, free: 2.145 MB / 0.7325 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0005373/0.6597, allocations: 108.3 kB / 0.9972 GB, free: 2.074 MB / 0.7325 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.85e-05/0.6598, allocations: 30.53 kB / 0.9972 GB, free: 2.066 MB / 0.7325 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 14 * Number of states: 0 () * Number of discrete variables: 30 (assEqu.nFai,$PRE.assEqu.nFai,$whenCondition7,$PRE.intGai.nextTimeEvent,$whenCondition6,$PRE.reference.nextTimeEvent,$whenCondition5,$PRE.tableSolRadWindow.nextTimeEvent,$whenCondition4,$PRE.outdoorTemp.nextTimeEvent,$whenCondition3,$whenCondition1,mean.y,$PRE.mean.y,assEqu.satisfied,$PRE.assEqu.satisfied,reference.nextTimeEventScaled,$PRE.reference.nextTimeEventScaled,reference.nextTimeEvent,$whenCondition2,outdoorTemp.nextTimeEventScaled,$PRE.outdoorTemp.nextTimeEventScaled,outdoorTemp.nextTimeEvent,greaterThreshold1.y,tableSolRadWindow.nextTimeEventScaled,$PRE.tableSolRadWindow.nextTimeEventScaled,tableSolRadWindow.nextTimeEvent,intGai.nextTimeEventScaled,$PRE.intGai.nextTimeEventScaled,intGai.nextTimeEvent) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (77): * Single equations (assignments): 75 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * 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): 2 systems {(1,3,100.0%), (2,18,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.0005913/0.6604, allocations: 0.6093 MB / 0.9978 GB, free: 1.738 MB / 0.7325 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001824/0.6606, allocations: 211.8 kB / 0.998 GB, free: 1.625 MB / 0.7325 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0003005/0.6609, allocations: 259.4 kB / 0.9983 GB, free: 1.484 MB / 0.7325 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 4.478e-06/0.6609, allocations: 6.844 kB / 0.9983 GB, free: 1.484 MB / 0.7325 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.92e-05/0.6609, allocations: 14.84 kB / 0.9983 GB, free: 1.473 MB / 0.7325 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 8.646e-06/0.661, allocations: 3.984 kB / 0.9983 GB, free: 1.469 MB / 0.7325 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003102/0.6641, allocations: 2.403 MB / 1.001 GB, free: 15.99 MB / 0.7481 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.845e-06/0.6641, allocations: 0 / 1.001 GB, free: 15.99 MB / 0.7481 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002876/0.6644, allocations: 72.61 kB / 1.001 GB, free: 15.97 MB / 0.7481 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0005231/0.6649, allocations: 251.3 kB / 1.001 GB, free: 15.85 MB / 0.7481 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.452e-05/0.665, allocations: 17.02 kB / 1.001 GB, free: 15.84 MB / 0.7481 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.004068/0.669, allocations: 4.751 MB / 1.006 GB, free: 11.72 MB / 0.7481 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.483e-06/0.669, allocations: 6.062 kB / 1.006 GB, free: 11.71 MB / 0.7481 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002307/0.6714, allocations: 1.638 MB / 1.007 GB, free: 10.8 MB / 0.7481 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003287/0.6717, allocations: 324.7 kB / 1.008 GB, free: 10.53 MB / 0.7481 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001329/0.6718, allocations: 19.38 kB / 1.008 GB, free: 10.52 MB / 0.7481 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004038/0.6722, allocations: 37.58 kB / 1.008 GB, free: 10.5 MB / 0.7481 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001394/0.6724, allocations: 77.33 kB / 1.008 GB, free: 10.45 MB / 0.7481 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.943e-05/0.6724, allocations: 29.02 kB / 1.008 GB, free: 10.44 MB / 0.7481 GB Notification: Performance of sorting global known variables: time 0.002002/0.6745, allocations: 2.459 MB / 1.01 GB, free: 9.344 MB / 0.7481 GB Notification: Performance of sort global known variables: time 2.21e-07/0.6745, allocations: 3.938 kB / 1.01 GB, free: 9.34 MB / 0.7481 GB Notification: Performance of remove unused functions: time 0.0007377/0.6752, allocations: 294 kB / 1.01 GB, free: 9.289 MB / 0.7481 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 4 (thermalZoneTwoElements.extWallRC.thermCapExt[1].T,thermalZoneTwoElements.intWallRC.thermCapInt[1].T,assEqu.diff,mean.x) * Number of discrete variables: 19 ($whenCondition7,$whenCondition6,$whenCondition5,$whenCondition4,$whenCondition3,$whenCondition2,$whenCondition1,intGai.nextTimeEvent,intGai.nextTimeEventScaled,reference.nextTimeEvent,reference.nextTimeEventScaled,tableSolRadWindow.nextTimeEvent,tableSolRadWindow.nextTimeEventScaled,greaterThreshold1.y,outdoorTemp.nextTimeEvent,outdoorTemp.nextTimeEventScaled,assEqu.satisfied,assEqu.nFai,mean.y) * Number of discrete states: 11 (intGai.nextTimeEvent,reference.nextTimeEvent,tableSolRadWindow.nextTimeEvent,outdoorTemp.nextTimeEvent,mean.x,assEqu.satisfied,assEqu.nFai,outdoorTemp.nextTimeEventScaled,tableSolRadWindow.nextTimeEventScaled,reference.nextTimeEventScaled,intGai.nextTimeEventScaled) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (51): * Single equations (assignments): 39 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 10 * 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): 2 systems {(2,18,100.0%), (1,3,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.0009763/0.6762, allocations: 496.4 kB / 1.011 GB, free: 9.066 MB / 0.7481 GB Notification: Performance of simCode: created initialization part: time 0.001681/0.6779, allocations: 1.091 MB / 1.012 GB, free: 8.406 MB / 0.7481 GB Notification: Performance of simCode: created event and clocks part: time 3.346e-06/0.6779, allocations: 4.188 kB / 1.012 GB, free: 8.402 MB / 0.7481 GB Notification: Performance of simCode: created simulation system equations: time 0.0009234/0.6788, allocations: 0.7141 MB / 1.013 GB, free: 7.918 MB / 0.7481 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001122/0.68, allocations: 296.6 kB / 1.013 GB, free: 7.742 MB / 0.7481 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004506/0.6845, allocations: 4.067 MB / 1.017 GB, free: 4.031 MB / 0.7481 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001038/0.6855, allocations: 1.552 MB / 1.018 GB, free: 2.445 MB / 0.7481 GB Notification: Performance of simCode: alias equations: time 0.0003528/0.6859, allocations: 162.6 kB / 1.019 GB, free: 2.281 MB / 0.7481 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001532/0.686, allocations: 71.42 kB / 1.019 GB, free: 2.211 MB / 0.7481 GB Notification: Performance of SimCode: time 2.4e-07/0.686, allocations: 3.938 kB / 1.019 GB, free: 2.207 MB / 0.7481 GB Notification: Performance of Templates: time 0.02296/0.709, allocations: 15.07 MB / 1.033 GB, free: 3.336 MB / 0.7637 GB make -j1 -f Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.makefile (rm -f Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.pipe ; mkfifo Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.pipe ; head -c 1048576 < Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.pipe >> ../files/Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.sim & ./Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10 -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_8_Buildings.ThermalZones.ReducedOrder.Validation.VDI6007.TestCase10.pipe 2>&1)