Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.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/IBPSA 4.0.0-master/package.mo", uses=false) Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-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(IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised") translateModel(IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001165/0.001165, allocations: 111.2 kB / 15.99 MB, free: 6.359 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001268/0.001268, allocations: 195.4 kB / 16.91 MB, free: 6.195 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.388/1.388, allocations: 222.9 MB / 240.6 MB, free: 15.42 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.8396/0.8396, allocations: 126.7 MB / 417.4 MB, free: 12.55 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001951/0.001952, allocations: 67.89 kB / 0.4953 GB, free: 3.195 MB / 414.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.3626/0.3646, allocations: 78.86 MB / 0.5723 GB, free: 30.84 MB / 446.1 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised): time 0.1846/0.5493, allocations: 159.4 MB / 0.7279 GB, free: 6.098 MB / 0.5606 GB Notification: Performance of NFInst.instExpressions: time 0.005788/0.5551, allocations: 3.597 MB / 0.7314 GB, free: 2.492 MB / 0.5606 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0003786/0.5555, allocations: 7.938 kB / 0.7314 GB, free: 2.484 MB / 0.5606 GB Notification: Performance of NFTyping.typeComponents: time 0.0006491/0.5562, allocations: 147.2 kB / 0.7316 GB, free: 2.34 MB / 0.5606 GB Notification: Performance of NFTyping.typeBindings: time 0.001472/0.5577, allocations: 498 kB / 0.7321 GB, free: 1.852 MB / 0.5606 GB Notification: Performance of NFTyping.typeClassSections: time 0.001272/0.559, allocations: 404.6 kB / 0.7324 GB, free: 1.465 MB / 0.5606 GB Notification: Performance of NFFlatten.flatten: time 0.00306/0.5621, allocations: 2.531 MB / 0.7349 GB, free: 14.93 MB / 0.5762 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001303/0.5634, allocations: 0.9059 MB / 0.7358 GB, free: 14.01 MB / 0.5762 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002235/0.5656, allocations: 1.195 MB / 0.737 GB, free: 12.81 MB / 0.5762 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0009231/0.5666, allocations: 0.7273 MB / 0.7377 GB, free: 12.08 MB / 0.5762 GB Notification: Performance of NFPackage.collectConstants: time 0.0001077/0.5667, allocations: 56 kB / 0.7377 GB, free: 12.02 MB / 0.5762 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001394/0.5681, allocations: 0.7445 MB / 0.7385 GB, free: 11.28 MB / 0.5762 GB Notification: Performance of NFScalarize.scalarize: time 0.0003593/0.5685, allocations: 310.9 kB / 0.7388 GB, free: 10.97 MB / 0.5762 GB Notification: Performance of NFVerifyModel.verify: time 0.0006743/0.5691, allocations: 0.544 MB / 0.7393 GB, free: 10.43 MB / 0.5762 GB Notification: Performance of NFConvertDAE.convert: time 0.001819/0.571, allocations: 1.421 MB / 0.7407 GB, free: 9 MB / 0.5762 GB Notification: Performance of FrontEnd - DAE generated: time 3.998e-06/0.571, allocations: 0 / 0.7407 GB, free: 9 MB / 0.5762 GB Notification: Performance of FrontEnd: time 3.256e-06/0.571, allocations: 0 / 0.7407 GB, free: 9 MB / 0.5762 GB Notification: Performance of Transformations before backend: time 1.327e-05/0.571, allocations: 3.938 kB / 0.7407 GB, free: 8.996 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: 125 * Number of variables: 125 Notification: Performance of Generate backend data structure: time 0.002449/0.5735, allocations: 1.451 MB / 0.7421 GB, free: 7.48 MB / 0.5762 GB Notification: Performance of prepare preOptimizeDAE: time 4.179e-05/0.5735, allocations: 11.97 kB / 0.7421 GB, free: 7.469 MB / 0.5762 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0007945/0.5743, allocations: 186.5 kB / 0.7423 GB, free: 7.285 MB / 0.5762 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001408/0.5757, allocations: 0.8023 MB / 0.7431 GB, free: 6.426 MB / 0.5762 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 4.929e-05/0.5758, allocations: 45 kB / 0.7431 GB, free: 6.383 MB / 0.5762 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001058/0.5759, allocations: 59.98 kB / 0.7432 GB, free: 6.324 MB / 0.5762 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001386/0.5773, allocations: 0.7888 MB / 0.7439 GB, free: 5.461 MB / 0.5762 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.18e-05/0.5773, allocations: 7.938 kB / 0.7439 GB, free: 5.453 MB / 0.5762 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 5.633e-05/0.5774, allocations: 23.94 kB / 0.744 GB, free: 5.43 MB / 0.5762 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.813e-05/0.5774, allocations: 16 kB / 0.744 GB, free: 5.414 MB / 0.5762 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0009794/0.5784, allocations: 0.5305 MB / 0.7445 GB, free: 4.879 MB / 0.5762 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 0.289/0.8674, allocations: 4.584 MB / 0.749 GB, free: 170.4 MB / 0.5762 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001022/0.8685, allocations: 417.3 kB / 0.7494 GB, free: 170.3 MB / 0.5762 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0004545/0.869, allocations: 247.5 kB / 0.7496 GB, free: 170.3 MB / 0.5762 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002993/0.8693, allocations: 193.7 kB / 0.7498 GB, free: 170.1 MB / 0.5762 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0005821/0.8699, allocations: 291.6 kB / 0.7501 GB, free: 170 MB / 0.5762 GB Notification: Performance of pre-optimization done (n=31): time 1.943e-06/0.8699, allocations: 3.609 kB / 0.7501 GB, free: 170 MB / 0.5762 GB Notification: Performance of matching and sorting (n=31): time 0.004337/0.8742, allocations: 1.305 MB / 0.7514 GB, free: 169.7 MB / 0.5762 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.141e-05/0.8743, allocations: 91 kB / 0.7514 GB, free: 169.6 MB / 0.5762 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001706/0.876, allocations: 1.115 MB / 0.7525 GB, free: 169.2 MB / 0.5762 GB Notification: Performance of collectPreVariables (initialization): time 5.989e-05/0.8761, allocations: 34.52 kB / 0.7526 GB, free: 169.2 MB / 0.5762 GB Notification: Performance of collectInitialEqns (initialization): time 0.0003792/0.8765, allocations: 491.8 kB / 0.753 GB, free: 168.9 MB / 0.5762 GB Notification: Performance of collectInitialBindings (initialization): time 9.044e-05/0.8766, allocations: 109.1 kB / 0.7531 GB, free: 168.9 MB / 0.5762 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001947/0.8768, allocations: 113.9 kB / 0.7532 GB, free: 168.8 MB / 0.5762 GB Notification: Performance of setup shared object (initialization): time 6.442e-05/0.8768, allocations: 324.6 kB / 0.7536 GB, free: 168.5 MB / 0.5762 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0004498/0.8773, allocations: 214.8 kB / 0.7538 GB, free: 168.4 MB / 0.5762 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0006241/0.8779, allocations: 0.5236 MB / 0.7543 GB, free: 168 MB / 0.5762 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0009811/0.8789, allocations: 0.6284 MB / 0.7549 GB, free: 167.6 MB / 0.5762 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.17e-06/0.8789, allocations: 1.781 kB / 0.7549 GB, free: 167.6 MB / 0.5762 GB Notification: Performance of matching and sorting (n=54) (initialization): time 0.002824/0.8818, allocations: 1.044 MB / 0.7559 GB, free: 167.3 MB / 0.5762 GB Notification: Performance of prepare postOptimizeDAE: time 4.545e-05/0.8818, allocations: 34.14 kB / 0.7559 GB, free: 167.2 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.553e-05/0.8818, allocations: 6.094 kB / 0.7559 GB, free: 167.2 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001459/0.8833, allocations: 367.2 kB / 0.7563 GB, free: 167.2 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0002319/0.8835, allocations: 60.67 kB / 0.7564 GB, free: 167.2 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0009449/0.8845, allocations: 1.01 MB / 0.7573 GB, free: 166.5 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007742/0.8853, allocations: 103.2 kB / 0.7574 GB, free: 166.5 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 5.724e-05/0.8854, allocations: 23.88 kB / 0.7575 GB, free: 166.4 MB / 0.5762 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0007257/0.8861, allocations: 0.4979 MB / 0.7579 GB, free: 166.2 MB / 0.5762 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0004734/0.8866, allocations: 495.3 kB / 0.7584 GB, free: 165.8 MB / 0.5762 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0006679/0.8872, allocations: 0.5546 MB / 0.759 GB, free: 165.3 MB / 0.5762 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.248e-06/0.8873, allocations: 1.375 kB / 0.759 GB, free: 165.3 MB / 0.5762 GB Notification: Performance of matching and sorting (n=54) (initialization_lambda0): time 0.001459/0.8887, allocations: 0.8298 MB / 0.7598 GB, free: 164.9 MB / 0.5762 GB Notification: Performance of prepare postOptimizeDAE: time 3.058e-05/0.8888, allocations: 47.75 kB / 0.7598 GB, free: 164.9 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 6.973e-06/0.8888, allocations: 6.281 kB / 0.7598 GB, free: 164.9 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0004894/0.8893, allocations: 204.4 kB / 0.76 GB, free: 164.8 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0001941/0.8895, allocations: 60.84 kB / 0.7601 GB, free: 164.8 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003502/0.893, allocations: 3.345 MB / 0.7633 GB, free: 162.1 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0008846/0.8939, allocations: 90.45 kB / 0.7634 GB, free: 162.1 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.813e-05/0.8939, allocations: 25.67 kB / 0.7635 GB, free: 162 MB / 0.5762 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 24 * Number of states: 0 () * Number of discrete variables: 5 (pulse_p.count,$PRE.pulse_p.count,pulse_p.T_start,$PRE.pulse_p.T_start,$whenCondition1) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (34): * Single equations (assignments): 32 * Array equations: 0 * Algorithm blocks: 1 * 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 {(1,19)} Notification: Performance of prepare postOptimizeDAE: time 0.0002065/0.8942, allocations: 206.8 kB / 0.7637 GB, free: 161.9 MB / 0.5762 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001197/0.8943, allocations: 100.5 kB / 0.7637 GB, free: 161.8 MB / 0.5762 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001214/0.8955, allocations: 0.7179 MB / 0.7644 GB, free: 161.4 MB / 0.5762 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 5.67e-06/0.8955, allocations: 3.562 kB / 0.7645 GB, free: 161.4 MB / 0.5762 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.397e-06/0.8955, allocations: 1.312 kB / 0.7645 GB, free: 161.4 MB / 0.5762 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 5.31e-06/0.8955, allocations: 3.297 kB / 0.7645 GB, free: 161.4 MB / 0.5762 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002183/0.8977, allocations: 1.606 MB / 0.766 GB, free: 160.3 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.641e-06/0.8977, allocations: 6.828 kB / 0.766 GB, free: 160.3 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001036/0.8978, allocations: 18.67 kB / 0.7661 GB, free: 160.3 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0004356/0.8983, allocations: 228.3 kB / 0.7663 GB, free: 160.2 MB / 0.5762 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.489e-05/0.8983, allocations: 7.719 kB / 0.7663 GB, free: 160.2 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0007143/0.899, allocations: 0.9716 MB / 0.7672 GB, free: 159.4 MB / 0.5762 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.238e-06/0.8991, allocations: 6.859 kB / 0.7672 GB, free: 159.4 MB / 0.5762 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001098/0.9002, allocations: 0.8342 MB / 0.768 GB, free: 158.9 MB / 0.5762 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0002755/0.9005, allocations: 211.5 kB / 0.7682 GB, free: 158.7 MB / 0.5762 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001054/0.9006, allocations: 12.16 kB / 0.7683 GB, free: 158.7 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004528/0.901, allocations: 49.33 kB / 0.7683 GB, free: 158.7 MB / 0.5762 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 8.843e-05/0.9011, allocations: 28.5 kB / 0.7683 GB, free: 158.7 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.73e-05/0.9012, allocations: 21.58 kB / 0.7684 GB, free: 158.7 MB / 0.5762 GB Notification: Performance of sorting global known variables: time 0.0009189/0.9021, allocations: 0.7861 MB / 0.7691 GB, free: 158.2 MB / 0.5762 GB Notification: Performance of sort global known variables: time 2e-07/0.9021, allocations: 0 / 0.7691 GB, free: 158.2 MB / 0.5762 GB Notification: Performance of remove unused functions: time 0.001318/0.9034, allocations: 440.8 kB / 0.7695 GB, free: 158.2 MB / 0.5762 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 0 () * Number of discrete variables: 3 ($whenCondition1,pulse_p.T_start,pulse_p.count) * Number of discrete states: 1 (pulse_p.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (12): * Single equations (assignments): 9 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 2 * 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 {(1,19)} Notification: Performance of Backend phase and start with SimCode phase: time 0.0004124/0.9038, allocations: 187 kB / 0.7697 GB, free: 158.1 MB / 0.5762 GB Notification: Performance of simCode: created initialization part: time 0.00173/0.9056, allocations: 1.08 MB / 0.7708 GB, free: 157.4 MB / 0.5762 GB Notification: Performance of simCode: created event and clocks part: time 3.056e-06/0.9056, allocations: 1.094 kB / 0.7708 GB, free: 157.4 MB / 0.5762 GB Notification: Performance of simCode: created simulation system equations: time 0.0004557/0.906, allocations: 236 kB / 0.771 GB, free: 157.3 MB / 0.5762 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001736/0.9078, allocations: 452.5 kB / 0.7714 GB, free: 157.1 MB / 0.5762 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002547/0.9103, allocations: 2.067 MB / 0.7735 GB, free: 155.8 MB / 0.5762 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0004701/0.9108, allocations: 1.178 MB / 0.7746 GB, free: 154.9 MB / 0.5762 GB Notification: Performance of simCode: alias equations: time 0.0008142/0.9117, allocations: 302.3 kB / 0.7749 GB, free: 154.7 MB / 0.5762 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001022/0.9118, allocations: 60.81 kB / 0.7749 GB, free: 154.7 MB / 0.5762 GB Notification: Performance of SimCode: time 5.21e-07/0.9118, allocations: 0 / 0.7749 GB, free: 154.7 MB / 0.5762 GB Notification: Performance of Templates: time 0.02571/0.9375, allocations: 19.53 MB / 0.794 GB, free: 136.2 MB / 0.5762 GB make -j1 -f IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.makefile (rm -f IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.sim & ./IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised -abortSlowSimulation -alarm=480 -lv LOG_STATS > IBPSA_latest_IBPSA.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe 2>&1)