Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.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/Buildings 12.0.0-master/package.mo", uses=false) Using package Buildings with version 12.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.0.0-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(Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal") translateModel(Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001078/0.001078, allocations: 108 kB / 15.61 MB, free: 152 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001139/0.001139, allocations: 192.6 kB / 16.53 MB, free: 6.664 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.564/1.564, allocations: 222.9 MB / 240.2 MB, free: 4.387 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.0.0-master/package.mo): time 2.959/2.959, allocations: 472.6 MB / 0.7451 GB, free: 4.68 MB / 0.5919 GB Notification: Performance of FrontEnd - loaded program: time 0.001345/0.001345, allocations: 65.44 kB / 0.912 GB, free: 33.43 MB / 0.7169 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3642/0.3655, allocations: 159.9 MB / 1.068 GB, free: 10.44 MB / 0.8262 GB Notification: Performance of NFInst.instantiate(Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal): time 0.008178/0.3738, allocations: 2.449 MB / 1.071 GB, free: 7.973 MB / 0.8262 GB Notification: Performance of NFInst.instExpressions: time 0.004142/0.378, allocations: 1.149 MB / 1.072 GB, free: 6.82 MB / 0.8262 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0004445/0.3784, allocations: 15.94 kB / 1.072 GB, free: 6.805 MB / 0.8262 GB Notification: Performance of NFTyping.typeComponents: time 0.0003785/0.3789, allocations: 55.41 kB / 1.072 GB, free: 6.75 MB / 0.8262 GB Notification: Performance of NFTyping.typeBindings: time 0.0002172/0.3791, allocations: 47.52 kB / 1.072 GB, free: 6.703 MB / 0.8262 GB Notification: Performance of NFTyping.typeClassSections: time 0.001664/0.3808, allocations: 334.6 kB / 1.072 GB, free: 6.379 MB / 0.8262 GB Notification: Performance of NFFlatten.flatten: time 0.001085/0.3819, allocations: 0.5889 MB / 1.073 GB, free: 5.789 MB / 0.8262 GB Notification: Performance of NFFlatten.resolveConnections: time 0.000955/0.3829, allocations: 386.8 kB / 1.073 GB, free: 5.41 MB / 0.8262 GB Notification: Performance of NFEvalConstants.evaluate: time 0.0004858/0.3834, allocations: 207.4 kB / 1.073 GB, free: 5.207 MB / 0.8262 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0004357/0.3839, allocations: 179.3 kB / 1.073 GB, free: 5.031 MB / 0.8262 GB Notification: Performance of NFPackage.collectConstants: time 0.000177/0.384, allocations: 67.94 kB / 1.073 GB, free: 4.965 MB / 0.8262 GB Notification: Performance of NFFlatten.collectFunctions: time 0.0002755/0.3843, allocations: 87.91 kB / 1.074 GB, free: 4.879 MB / 0.8262 GB Notification: Performance of NFScalarize.scalarize: time 0.0001986/0.3846, allocations: 111.7 kB / 1.074 GB, free: 4.77 MB / 0.8262 GB Notification: Performance of NFVerifyModel.verify: time 0.0004182/0.385, allocations: 211.1 kB / 1.074 GB, free: 4.562 MB / 0.8262 GB Notification: Performance of NFConvertDAE.convert: time 0.001143/0.3862, allocations: 0.6546 MB / 1.075 GB, free: 3.906 MB / 0.8262 GB Notification: Performance of FrontEnd - DAE generated: time 5.28e-06/0.3862, allocations: 0 / 1.075 GB, free: 3.906 MB / 0.8262 GB Notification: Performance of FrontEnd: time 2.044e-06/0.3862, allocations: 0 / 1.075 GB, free: 3.906 MB / 0.8262 GB Notification: Performance of Transformations before backend: time 1.919e-05/0.3862, allocations: 4 kB / 1.075 GB, free: 3.902 MB / 0.8262 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 86 * Number of variables: 86 Notification: Performance of Generate backend data structure: time 0.001801/0.388, allocations: 0.6599 MB / 1.075 GB, free: 3.184 MB / 0.8262 GB Notification: Performance of prepare preOptimizeDAE: time 5.228e-05/0.3881, allocations: 8.031 kB / 1.075 GB, free: 3.176 MB / 0.8262 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0001919/0.3883, allocations: 44.47 kB / 1.075 GB, free: 3.133 MB / 0.8262 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0007122/0.3891, allocations: 340 kB / 1.076 GB, free: 2.762 MB / 0.8262 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.849e-05/0.3891, allocations: 41.36 kB / 1.076 GB, free: 2.719 MB / 0.8262 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001295/0.3893, allocations: 44.38 kB / 1.076 GB, free: 2.676 MB / 0.8262 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001268/0.3906, allocations: 431.1 kB / 1.076 GB, free: 2.227 MB / 0.8262 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.665e-05/0.3906, allocations: 192 / 1.076 GB, free: 2.227 MB / 0.8262 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.969e-05/0.3907, allocations: 19.94 kB / 1.076 GB, free: 2.207 MB / 0.8262 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.741e-05/0.3907, allocations: 11.94 kB / 1.076 GB, free: 2.195 MB / 0.8262 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001026/0.3918, allocations: 258.4 kB / 1.076 GB, free: 1.945 MB / 0.8262 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.002442/0.3942, allocations: 1.675 MB / 1.078 GB, free: 196 kB / 0.8262 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0004689/0.3947, allocations: 248 kB / 1.078 GB, free: 15.92 MB / 0.8419 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0002312/0.395, allocations: 134.5 kB / 1.078 GB, free: 15.78 MB / 0.8419 GB Notification: Performance of preOpt evalFunc (simulation): time 2.886e-05/0.395, allocations: 0 / 1.078 GB, free: 15.78 MB / 0.8419 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0004622/0.3955, allocations: 233.7 kB / 1.079 GB, free: 15.53 MB / 0.8419 GB Notification: Performance of pre-optimization done (n=31): time 4.097e-06/0.3955, allocations: 0 / 1.079 GB, free: 15.53 MB / 0.8419 GB Notification: Performance of matching and sorting (n=31): time 0.0008465/0.3963, allocations: 414.9 kB / 1.079 GB, free: 15.12 MB / 0.8419 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.893e-05/0.3964, allocations: 122.7 kB / 1.079 GB, free: 14.98 MB / 0.8419 GB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.0.0-master/Templates/Plants/Controls/Utilities/PlaceholderLogical.mo:9:3-11:47:writable] Warning: Parameter holTim.ph.u_internal has no value, and is fixed during initialization (fixed=true), using available start value (start=true) as default value. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 12.0.0-master/Templates/Plants/Controls/Utilities/PlaceholderLogical.mo:9:3-11:47:writable] Warning: Parameter hol.ph.u_internal has no value, and is fixed during initialization (fixed=true), using available start value (start=true) as default value. Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0003544/0.3968, allocations: 223.8 kB / 1.079 GB, free: 14.75 MB / 0.8419 GB Notification: Performance of collectPreVariables (initialization): time 6.192e-05/0.3969, allocations: 49.7 kB / 1.079 GB, free: 14.7 MB / 0.8419 GB Notification: Performance of collectInitialEqns (initialization): time 0.0002486/0.3971, allocations: 192.4 kB / 1.079 GB, free: 14.5 MB / 0.8419 GB Notification: Performance of collectInitialBindings (initialization): time 7.747e-05/0.3972, allocations: 79 kB / 1.08 GB, free: 14.43 MB / 0.8419 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001842/0.3974, allocations: 110.1 kB / 1.08 GB, free: 14.31 MB / 0.8419 GB Notification: Performance of setup shared object (initialization): time 0.0001271/0.3975, allocations: 334.8 kB / 1.08 GB, free: 13.97 MB / 0.8419 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0002808/0.3978, allocations: 132.9 kB / 1.08 GB, free: 13.84 MB / 0.8419 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0004091/0.3982, allocations: 255.9 kB / 1.08 GB, free: 13.54 MB / 0.8419 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0006792/0.3989, allocations: 361.1 kB / 1.081 GB, free: 13.13 MB / 0.8419 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.617e-06/0.3989, allocations: 0 / 1.081 GB, free: 13.13 MB / 0.8419 GB Notification: Performance of matching and sorting (n=56) (initialization): time 0.0008934/0.3998, allocations: 488.1 kB / 1.081 GB, free: 12.64 MB / 0.8419 GB Notification: Performance of prepare postOptimizeDAE: time 4.226e-05/0.3999, allocations: 33.7 kB / 1.081 GB, free: 12.6 MB / 0.8419 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.08e-05/0.3999, allocations: 8.484 kB / 1.081 GB, free: 12.59 MB / 0.8419 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.939e-05/0.3999, allocations: 12 kB / 1.081 GB, free: 12.58 MB / 0.8419 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0002201/0.4002, allocations: 51.84 kB / 1.081 GB, free: 12.53 MB / 0.8419 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.673e-05/0.4002, allocations: 8 kB / 1.081 GB, free: 12.52 MB / 0.8419 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0003257/0.4005, allocations: 59.59 kB / 1.081 GB, free: 12.46 MB / 0.8419 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.044e-05/0.4006, allocations: 27.98 kB / 1.081 GB, free: 12.44 MB / 0.8419 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 17 * Number of states: 0 () * Number of discrete variables: 42 ($PRE.holTim.truHol.onDelay.u,$PRE.holTim.truHol.toOutputTrue.enableFire,$PRE.holTim.truHol.toInitial.enableFire,$PRE.holTim.truHol.onDelay.t_next,$whenCondition4,$whenCondition2,$whenCondition3,holTim.truHol.toInitial.enableFire,holTim.truHol.toOutputTrue.enableFire,holTim.truHol.outputTrue.active,holTim.truHol.outputTrue.oldActive,$PRE.holTim.truHol.outputTrue.oldActive,holTim.truHol.outputTrue.newActive,$PRE.holTim.truHol.outputTrue.newActive,holTim.truHol.outputTrue.localActive,$PRE.holTim.truHol.outputTrue.localActive,holTim.truHol.initialStep.oldActive,$PRE.holTim.truHol.initialStep.oldActive,holTim.truHol.initialStep.newActive,$PRE.holTim.truHol.initialStep.newActive,holTim.truHol.initialStep.localActive,$PRE.holTim.truHol.initialStep.localActive,holTim.truHol.initialStep.active,holTim.truHol.onDelay.y,holTim.truHol.onDelay.u,holTim.truHol.stateGraphRoot.activeSteps,holTim.triSam.y,$PRE.holTim.triSam.y,booPul.y,$PRE.booPul.y,hol.triSam.y,$PRE.hol.triSam.y,$whenCondition1,$whenCondition6,$whenCondition5,holTim.truHol.onDelay.t_next,holTim.truHol.toOutputTrue.t_start,$PRE.holTim.truHol.toOutputTrue.t_start,holTim.truHol.toInitial.t_start,$PRE.holTim.truHol.toInitial.t_start,holTim.truHol.stateGraphRoot.resume,holTim.truHol.stateGraphRoot.suspend) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (54): * Single equations (assignments): 53 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.000238/0.4008, allocations: 210.9 kB / 1.082 GB, free: 12.22 MB / 0.8419 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 4.678e-05/0.4009, allocations: 27.66 kB / 1.082 GB, free: 12.2 MB / 0.8419 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0006107/0.4015, allocations: 316.1 kB / 1.082 GB, free: 11.88 MB / 0.8419 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 6.943e-06/0.4015, allocations: 4 kB / 1.082 GB, free: 11.88 MB / 0.8419 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.973e-06/0.4015, allocations: 4 kB / 1.082 GB, free: 11.87 MB / 0.8419 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.05e-05/0.4016, allocations: 7.969 kB / 1.082 GB, free: 11.86 MB / 0.8419 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001195/0.4028, allocations: 0.8611 MB / 1.083 GB, free: 10.94 MB / 0.8419 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.988e-06/0.4028, allocations: 0 / 1.083 GB, free: 10.94 MB / 0.8419 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001089/0.4029, allocations: 23.92 kB / 1.083 GB, free: 10.91 MB / 0.8419 GB Notification: Performance of postOpt tearingSystem (simulation): time 7.383e-06/0.4029, allocations: 4 kB / 1.083 GB, free: 10.91 MB / 0.8419 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 3.048e-05/0.4029, allocations: 11.98 kB / 1.083 GB, free: 10.9 MB / 0.8419 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 4.929e-06/0.403, allocations: 4 kB / 1.083 GB, free: 10.89 MB / 0.8419 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.803e-06/0.403, allocations: 0 / 1.083 GB, free: 10.89 MB / 0.8419 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.0006277/0.4036, allocations: 430.7 kB / 1.083 GB, free: 10.45 MB / 0.8419 GB Notification: Performance of postOpt removeConstants (simulation): time 7.805e-05/0.4037, allocations: 100.8 kB / 1.083 GB, free: 10.34 MB / 0.8419 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 4.882e-05/0.4037, allocations: 11.98 kB / 1.083 GB, free: 10.32 MB / 0.8419 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0001186/0.4039, allocations: 8 kB / 1.083 GB, free: 10.32 MB / 0.8419 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 8.891e-05/0.404, allocations: 35.83 kB / 1.083 GB, free: 10.28 MB / 0.8419 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.888e-05/0.404, allocations: 16 kB / 1.083 GB, free: 10.27 MB / 0.8419 GB Notification: Performance of sorting global known variables: time 0.0001266/0.4041, allocations: 145.5 kB / 1.084 GB, free: 10.12 MB / 0.8419 GB Notification: Performance of sort global known variables: time 1.6e-07/0.4041, allocations: 0 / 1.084 GB, free: 10.12 MB / 0.8419 GB Notification: Performance of remove unused functions: time 0.0004541/0.4046, allocations: 95.67 kB / 1.084 GB, free: 10.03 MB / 0.8419 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 3 * Number of states: 0 () * Number of discrete variables: 27 (holTim.truHol.toInitial.t_start,holTim.truHol.toOutputTrue.t_start,holTim.truHol.outputTrue.localActive,holTim.truHol.onDelay.u,holTim.truHol.outputTrue.active,holTim.truHol.initialStep.active,$cse1,$cse2,$whenCondition4,$whenCondition5,$whenCondition6,$whenCondition2,$whenCondition3,$whenCondition1,hol.triSam.y,booPul.y,holTim.triSam.y,holTim.truHol.stateGraphRoot.activeSteps,holTim.truHol.onDelay.y,holTim.truHol.onDelay.t_next,holTim.truHol.initialStep.localActive,holTim.truHol.initialStep.newActive,holTim.truHol.initialStep.oldActive,holTim.truHol.outputTrue.newActive,holTim.truHol.outputTrue.oldActive,holTim.truHol.toOutputTrue.enableFire,holTim.truHol.toInitial.enableFire) * Number of discrete states: 5 (holTim.truHol.onDelay.t_next,holTim.truHol.initialStep.newActive,holTim.truHol.outputTrue.newActive,holTim.truHol.toOutputTrue.t_start,holTim.truHol.toInitial.t_start) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (33): * Single equations (assignments): 24 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 9 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.000228/0.4048, allocations: 133.1 kB / 1.084 GB, free: 9.895 MB / 0.8419 GB Notification: Performance of simCode: created initialization part: time 0.0007561/0.4056, allocations: 403.8 kB / 1.084 GB, free: 9.488 MB / 0.8419 GB Notification: Performance of simCode: created event and clocks part: time 3.266e-06/0.4056, allocations: 0 / 1.084 GB, free: 9.488 MB / 0.8419 GB Notification: Performance of simCode: created simulation system equations: time 0.0003197/0.4059, allocations: 143.8 kB / 1.084 GB, free: 9.348 MB / 0.8419 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0003652/0.4063, allocations: 39.7 kB / 1.084 GB, free: 9.309 MB / 0.8419 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.00106/0.4074, allocations: 0.5512 MB / 1.085 GB, free: 8.723 MB / 0.8419 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000448/0.4078, allocations: 0.784 MB / 1.086 GB, free: 7.914 MB / 0.8419 GB Notification: Performance of simCode: alias equations: time 0.0001285/0.408, allocations: 42.94 kB / 1.086 GB, free: 7.875 MB / 0.8419 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 7.187e-05/0.4081, allocations: 23.44 kB / 1.086 GB, free: 7.852 MB / 0.8419 GB Notification: Performance of SimCode: time 1.953e-06/0.4081, allocations: 0 / 1.086 GB, free: 7.852 MB / 0.8419 GB Notification: Performance of Templates: time 0.008674/0.4167, allocations: 3.454 MB / 1.089 GB, free: 4.426 MB / 0.8419 GB make -j1 -f Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.makefile (rm -f Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.pipe ; mkfifo Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.pipe ; head -c 1048576 < Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.pipe >> ../files/Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.sim & ./Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_3.0.0_Buildings.Templates.Plants.Controls.Utilities.Validation.HoldReal.pipe 2>&1)