Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_dev_IDEAS.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/IDEAS 3.0.0-master/package.mo", uses=false) Using package IDEAS with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-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(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised") translateModel(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="IDEAS_dev_IDEAS.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 0.006937/0.006937, allocations: 102.3 kB / 15.73 MB, free: 5.582 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001496/0.001496, allocations: 191.2 kB / 16.67 MB, free: 5.52 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.341/1.341, allocations: 222.9 MB / 240.4 MB, free: 15.16 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0-master/package.mo): time 0.83/0.83, allocations: 135.1 MB / 425.7 MB, free: 4.082 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001166/0.001166, allocations: 70.41 kB / 0.5856 GB, free: 21.44 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1481/0.1493, allocations: 80.92 MB / 0.6647 GB, free: 5.77 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised): time 0.5352/0.6845, allocations: 161.6 MB / 0.8225 GB, free: 4.582 MB / 0.5919 GB Notification: Performance of NFInst.instExpressions: time 0.005189/0.6898, allocations: 3.624 MB / 0.826 GB, free: 1.652 MB / 0.5919 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0004839/0.6903, allocations: 12.12 kB / 0.826 GB, free: 1.648 MB / 0.5919 GB Notification: Performance of NFTyping.typeComponents: time 0.0006423/0.691, allocations: 161.1 kB / 0.8262 GB, free: 1.516 MB / 0.5919 GB Notification: Performance of NFTyping.typeBindings: time 0.001544/0.6926, allocations: 0.5577 MB / 0.8267 GB, free: 1.094 MB / 0.5919 GB Notification: Performance of NFTyping.typeClassSections: time 0.001346/0.6939, allocations: 438.6 kB / 0.8271 GB, free: 0.793 MB / 0.5919 GB Notification: Performance of NFFlatten.flatten: time 0.002863/0.6968, allocations: 2.542 MB / 0.8296 GB, free: 15.39 MB / 0.6075 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0014/0.6982, allocations: 0.9366 MB / 0.8305 GB, free: 14.86 MB / 0.6075 GB Notification: Performance of NFEvalConstants.evaluate: time 0.001885/0.7001, allocations: 1.047 MB / 0.8316 GB, free: 14.31 MB / 0.6075 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001172/0.7013, allocations: 0.7037 MB / 0.8323 GB, free: 13.91 MB / 0.6075 GB Notification: Performance of NFPackage.collectConstants: time 0.0002355/0.7016, allocations: 67.55 kB / 0.8323 GB, free: 13.89 MB / 0.6075 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001667/0.7032, allocations: 0.739 MB / 0.833 GB, free: 13.5 MB / 0.6075 GB Notification: Performance of NFScalarize.scalarize: time 0.00046/0.7037, allocations: 309 kB / 0.8333 GB, free: 13.29 MB / 0.6075 GB Notification: Performance of NFVerifyModel.verify: time 0.001028/0.7047, allocations: 0.5448 MB / 0.8339 GB, free: 12.96 MB / 0.6075 GB Notification: Performance of NFConvertDAE.convert: time 0.002013/0.7068, allocations: 1.41 MB / 0.8352 GB, free: 12.12 MB / 0.6075 GB Notification: Performance of FrontEnd - DAE generated: time 4.789e-06/0.7068, allocations: 0 / 0.8352 GB, free: 12.12 MB / 0.6075 GB Notification: Performance of FrontEnd: time 1.442e-06/0.7068, allocations: 2.156 kB / 0.8352 GB, free: 12.12 MB / 0.6075 GB Notification: Performance of Transformations before backend: time 4.963e-05/0.7068, allocations: 0 / 0.8352 GB, free: 12.12 MB / 0.6075 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 0.002846/0.7097, allocations: 1.446 MB / 0.8367 GB, free: 11.01 MB / 0.6075 GB Notification: Performance of prepare preOptimizeDAE: time 4.239e-05/0.7097, allocations: 10.64 kB / 0.8367 GB, free: 11.01 MB / 0.6075 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0009578/0.7107, allocations: 188.4 kB / 0.8368 GB, free: 10.92 MB / 0.6075 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001668/0.7124, allocations: 0.8563 MB / 0.8377 GB, free: 10.29 MB / 0.6075 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.653e-05/0.7125, allocations: 50.12 kB / 0.8377 GB, free: 10.27 MB / 0.6075 GB Notification: Performance of preOpt expandDerOperator (simulation): time 9.163e-05/0.7126, allocations: 56.91 kB / 0.8378 GB, free: 10.25 MB / 0.6075 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001159/0.7137, allocations: 0.7907 MB / 0.8386 GB, free: 9.684 MB / 0.6075 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.695e-05/0.7138, allocations: 0 / 0.8386 GB, free: 9.684 MB / 0.6075 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.295e-05/0.7138, allocations: 23.44 kB / 0.8386 GB, free: 9.668 MB / 0.6075 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.396e-05/0.7138, allocations: 16.56 kB / 0.8386 GB, free: 9.664 MB / 0.6075 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0008874/0.7147, allocations: 0.5325 MB / 0.8391 GB, free: 9.406 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 0.00442/0.7192, allocations: 4.588 MB / 0.8436 GB, free: 5.102 MB / 0.6075 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0006526/0.7198, allocations: 416.2 kB / 0.844 GB, free: 4.895 MB / 0.6075 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003445/0.7202, allocations: 243.8 kB / 0.8442 GB, free: 4.777 MB / 0.6075 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002875/0.7205, allocations: 193.7 kB / 0.8444 GB, free: 4.578 MB / 0.6075 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0004595/0.721, allocations: 300.5 kB / 0.8447 GB, free: 4.379 MB / 0.6075 GB Notification: Performance of pre-optimization done (n=31): time 2.535e-06/0.721, allocations: 0 / 0.8447 GB, free: 4.379 MB / 0.6075 GB Notification: Performance of matching and sorting (n=31): time 0.003702/0.7247, allocations: 1.323 MB / 0.846 GB, free: 3.641 MB / 0.6075 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.924e-05/0.7247, allocations: 86.42 kB / 0.8461 GB, free: 3.543 MB / 0.6075 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001439/0.7262, allocations: 1.124 MB / 0.8472 GB, free: 2.941 MB / 0.6075 GB Notification: Performance of collectPreVariables (initialization): time 5.67e-05/0.7263, allocations: 34.11 kB / 0.8472 GB, free: 2.906 MB / 0.6075 GB Notification: Performance of collectInitialEqns (initialization): time 0.000395/0.7267, allocations: 490.7 kB / 0.8477 GB, free: 2.492 MB / 0.6075 GB Notification: Performance of collectInitialBindings (initialization): time 9.445e-05/0.7268, allocations: 113.9 kB / 0.8478 GB, free: 2.395 MB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001596/0.7269, allocations: 110.1 kB / 0.8479 GB, free: 2.332 MB / 0.6075 GB Notification: Performance of setup shared object (initialization): time 0.0001157/0.7271, allocations: 327.7 kB / 0.8482 GB, free: 2.012 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0003527/0.7274, allocations: 213.9 kB / 0.8484 GB, free: 1.902 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0005584/0.728, allocations: 0.5186 MB / 0.8489 GB, free: 1.41 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0008142/0.7288, allocations: 0.6261 MB / 0.8495 GB, free: 0.9414 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.969e-06/0.7288, allocations: 2.812 kB / 0.8495 GB, free: 0.9414 MB / 0.6075 GB Notification: Performance of matching and sorting (n=54) (initialization): time 0.002315/0.7311, allocations: 1.035 MB / 0.8505 GB, free: 15.91 MB / 0.6231 GB Notification: Performance of prepare postOptimizeDAE: time 4.197e-05/0.7312, allocations: 45.69 kB / 0.8506 GB, free: 15.86 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.334e-05/0.7312, allocations: 4 kB / 0.8506 GB, free: 15.86 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001375/0.7326, allocations: 366.9 kB / 0.8509 GB, free: 15.5 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0002196/0.7328, allocations: 59.84 kB / 0.851 GB, free: 15.45 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001036/0.7339, allocations: 1.013 MB / 0.852 GB, free: 14.41 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007157/0.7346, allocations: 67.5 kB / 0.852 GB, free: 14.34 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.162e-05/0.7347, allocations: 27.98 kB / 0.8521 GB, free: 14.31 MB / 0.6231 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.000732/0.7354, allocations: 0.4928 MB / 0.8525 GB, free: 13.81 MB / 0.6231 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0005371/0.736, allocations: 494 kB / 0.853 GB, free: 13.2 MB / 0.6231 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0007413/0.7367, allocations: 0.5569 MB / 0.8536 GB, free: 12.56 MB / 0.6231 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.93e-06/0.7367, allocations: 4 kB / 0.8536 GB, free: 12.55 MB / 0.6231 GB Notification: Performance of matching and sorting (n=54) (initialization_lambda0): time 0.001565/0.7383, allocations: 0.8263 MB / 0.8544 GB, free: 11.71 MB / 0.6231 GB Notification: Performance of prepare postOptimizeDAE: time 3.732e-05/0.7384, allocations: 37.64 kB / 0.8544 GB, free: 11.67 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.915e-06/0.7384, allocations: 7.938 kB / 0.8544 GB, free: 11.66 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0004936/0.7389, allocations: 209 kB / 0.8546 GB, free: 11.45 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0002067/0.7391, allocations: 59.91 kB / 0.8547 GB, free: 11.39 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003729/0.7428, allocations: 3.339 MB / 0.8579 GB, free: 7.898 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007419/0.7436, allocations: 75.94 kB / 0.858 GB, free: 7.824 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.876e-05/0.7436, allocations: 20 kB / 0.858 GB, free: 7.805 MB / 0.6231 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 0.0002079/0.7439, allocations: 220.2 kB / 0.8582 GB, free: 7.582 MB / 0.6231 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002089/0.7441, allocations: 106.7 kB / 0.8583 GB, free: 7.477 MB / 0.6231 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001261/0.7453, allocations: 0.7024 MB / 0.859 GB, free: 6.758 MB / 0.6231 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 6.642e-06/0.7454, allocations: 4 kB / 0.859 GB, free: 6.754 MB / 0.6231 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 2.265e-06/0.7454, allocations: 0 / 0.859 GB, free: 6.754 MB / 0.6231 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.261e-06/0.7454, allocations: 3.984 kB / 0.859 GB, free: 6.75 MB / 0.6231 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.00253/0.7479, allocations: 1.599 MB / 0.8606 GB, free: 5.07 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 9.147e-06/0.7479, allocations: 3.938 kB / 0.8606 GB, free: 5.066 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0001541/0.7481, allocations: 23.92 kB / 0.8606 GB, free: 5.043 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0004712/0.7486, allocations: 228.7 kB / 0.8608 GB, free: 4.816 MB / 0.6231 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.591e-05/0.7486, allocations: 11.98 kB / 0.8608 GB, free: 4.805 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0008649/0.7495, allocations: 0.9739 MB / 0.8618 GB, free: 3.805 MB / 0.6231 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.473e-05/0.7495, allocations: 11.92 kB / 0.8618 GB, free: 3.793 MB / 0.6231 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001187/0.7507, allocations: 0.8136 MB / 0.8626 GB, free: 2.938 MB / 0.6231 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003463/0.7511, allocations: 219.8 kB / 0.8628 GB, free: 2.703 MB / 0.6231 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001363/0.7512, allocations: 11.94 kB / 0.8628 GB, free: 2.691 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004183/0.7516, allocations: 31.97 kB / 0.8629 GB, free: 2.66 MB / 0.6231 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 8.99e-05/0.7517, allocations: 27.91 kB / 0.8629 GB, free: 2.633 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.672e-05/0.7518, allocations: 11.98 kB / 0.8629 GB, free: 2.621 MB / 0.6231 GB Notification: Performance of sorting global known variables: time 0.001031/0.7528, allocations: 0.7916 MB / 0.8637 GB, free: 1.82 MB / 0.6231 GB Notification: Performance of sort global known variables: time 2.1e-07/0.7528, allocations: 0 / 0.8637 GB, free: 1.82 MB / 0.6231 GB Notification: Performance of remove unused functions: time 0.001256/0.7541, allocations: 431.4 kB / 0.8641 GB, free: 1.398 MB / 0.6231 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 0.0004028/0.7545, allocations: 186.9 kB / 0.8643 GB, free: 1.219 MB / 0.6231 GB Notification: Performance of simCode: created initialization part: time 0.001858/0.7564, allocations: 1.079 MB / 0.8653 GB, free: 108 kB / 0.6231 GB Notification: Performance of simCode: created event and clocks part: time 3.327e-06/0.7564, allocations: 4.062 kB / 0.8653 GB, free: 104 kB / 0.6231 GB Notification: Performance of simCode: created simulation system equations: time 0.0004939/0.7569, allocations: 230.3 kB / 0.8655 GB, free: 15.88 MB / 0.6387 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001737/0.7586, allocations: 459 kB / 0.866 GB, free: 15.43 MB / 0.6387 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002646/0.7613, allocations: 1.739 MB / 0.8677 GB, free: 13.63 MB / 0.6387 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007776/0.7621, allocations: 1.184 MB / 0.8688 GB, free: 12.42 MB / 0.6387 GB Notification: Performance of simCode: alias equations: time 0.0007468/0.7628, allocations: 315.8 kB / 0.8691 GB, free: 12.11 MB / 0.6387 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001234/0.763, allocations: 67.42 kB / 0.8692 GB, free: 12.04 MB / 0.6387 GB Notification: Performance of SimCode: time 4.21e-07/0.763, allocations: 3.938 kB / 0.8692 GB, free: 12.04 MB / 0.6387 GB Notification: Performance of Templates: time 0.03142/0.7944, allocations: 19.77 MB / 0.8885 GB, free: 8.457 MB / 0.6544 GB make -j1 -f IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.makefile (rm -f IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe ; mkfifo IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe ; head -c 1048576 < IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe >> ../files/IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.sim & ./IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised -abortSlowSimulation -alarm=480 -lv LOG_STATS > IDEAS_dev_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesDpOptimised.pipe 2>&1)